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0
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1 <tool id="rgDifferentialCount" name="Differential_Count" version="0.20">
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2 <description>models using BioConductor packages</description>
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3 <requirements>
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4 <requirement type="package" version="2.12">biocbasics</requirement>
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5 <requirement type="package" version="3.0.1">r3</requirement>
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5
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6 <requirement type="package" version="1.3.18">graphicsmagick</requirement>
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1
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7 <requirement type="package" version="9.07">ghostscript</requirement>
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0
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8 </requirements>
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9
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10 <command interpreter="python">
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11 rgToolFactory.py --script_path "$runme" --interpreter "Rscript" --tool_name "DifferentialCounts"
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8
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12 --output_dir "$html_file.files_path" --output_html "$html_file" --make_HTML "yes"
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0
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13 </command>
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14 <inputs>
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15 <param name="input1" type="data" format="tabular" label="Select an input matrix - rows are contigs, columns are counts for each sample"
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16 help="Use the HTSeq based count matrix preparation tool to create these matrices from BAM/SAM files and a GTF file of genomic features"/>
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17 <param name="title" type="text" value="Differential Counts" size="80" label="Title for job outputs"
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18 help="Supply a meaningful name here to remind you what the outputs contain">
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19 <sanitizer invalid_char="">
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20 <valid initial="string.letters,string.digits"><add value="_" /> </valid>
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21 </sanitizer>
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22 </param>
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23 <param name="treatment_name" type="text" value="Treatment" size="50" label="Treatment Name"/>
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24 <param name="Treat_cols" label="Select columns containing treatment." type="data_column" data_ref="input1" numerical="True"
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25 multiple="true" use_header_names="true" size="120" display="checkboxes">
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26 <validator type="no_options" message="Please select at least one column."/>
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27 </param>
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28 <param name="control_name" type="text" value="Control" size="50" label="Control Name"/>
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29 <param name="Control_cols" label="Select columns containing control." type="data_column" data_ref="input1" numerical="True"
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30 multiple="true" use_header_names="true" size="120" display="checkboxes" optional="true">
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31 </param>
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32 <param name="subjectids" type="text" optional="true" size="120" value = ""
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33 label="IF SUBJECTS NOT ALL INDEPENDENT! Enter integers to indicate sample pairing for every column in input"
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34 help="Leave blank if no pairing, but eg if data from sample id A99 is in columns 2,4 and id C21 is in 3,5 then enter '1,2,1,2'">
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35 <sanitizer>
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36 <valid initial="string.digits"><add value="," /> </valid>
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37 </sanitizer>
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38 </param>
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39 <param name="fQ" type="float" value="0.3" size="5" label="Non-differential contig count quantile threshold - zero to analyze all non-zero read count contigs"
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40 help="May be a good or a bad idea depending on the biology and the question. EG 0.3 = sparsest 30% of contigs with at least one read are removed before analysis"/>
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41 <param name="useNDF" type="boolean" truevalue="T" falsevalue="F" checked="false" size="1"
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42 label="Non differential filter - remove contigs below a threshold (1 per million) for half or more samples"
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43 help="May be a good or a bad idea depending on the biology and the question. This was the old default. Quantile based is available as an alternative"/>
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44
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45 <conditional name="edgeR">
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46 <param name="doedgeR" type="select"
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47 label="Run this model using edgeR"
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48 help="edgeR uses a negative binomial model and seems to be powerful, even with few replicates">
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49 <option value="F">Do not run edgeR</option>
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50 <option value="T" selected="true">Run edgeR</option>
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51 </param>
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52 <when value="T">
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53 <param name="edgeR_priordf" type="integer" value="20" size="3"
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54 label="prior.df for tagwise dispersion - lower value = more emphasis on each tag's variance. Replaces prior.n and prior.df = prior.n * residual.df"
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55 help="0 = Use edgeR default. Use a small value to 'smooth' small samples. See edgeR docs and note below"/>
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56 </when>
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57 <when value="F"> </when>
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58 </conditional>
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59 <conditional name="DESeq2">
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60 <param name="doDESeq2" type="select"
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61 label="Run the same model with DESeq2 and compare findings"
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62 help="DESeq2 is an update to the DESeq package. It uses different assumptions and methods to edgeR">
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63 <option value="F" selected="true">Do not run DESeq2</option>
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17
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64 <option value="T">Run DESeq2</option>
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65 </param>
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66 <when value="T">
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67 <param name="DESeq_fitType" type="select">
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68 <option value="parametric" selected="true">Parametric (default) fit for dispersions</option>
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17
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69 <option value="local">Local fit - this will automagically be used if parametric fit fails</option>
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70 <option value="mean">Mean dispersion fit- use this if you really understand what you're doing - read the fine manual linked below in the documentation</option>
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0
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71 </param>
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72 </when>
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73 <when value="F"> </when>
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74 </conditional>
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75 <param name="doVoom" type="select"
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76 label="Run the same model with Voom/limma and compare findings"
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17
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77 help="Voom uses counts per million and a precise transformation of variance so count data can be analysed using limma">
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78 <option value="F" selected="true">Do not run VOOM</option>
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79 <option value="T">Run VOOM</option>
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80 </param>
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81 <param name="fdrthresh" type="float" value="0.05" size="5" label="P value threshold for FDR filtering for amily wise error rate control"
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82 help="Conventional default value of 0.05 recommended"/>
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83 <param name="fdrtype" type="select" label="FDR (Type II error) control method"
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84 help="Use fdr or bh typically to control for the number of tests in a reliable way">
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85 <option value="fdr" selected="true">fdr</option>
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86 <option value="BH">Benjamini Hochberg</option>
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87 <option value="BY">Benjamini Yukateli</option>
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88 <option value="bonferroni">Bonferroni</option>
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89 <option value="hochberg">Hochberg</option>
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90 <option value="holm">Holm</option>
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91 <option value="hommel">Hommel</option>
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92 <option value="none">no control for multiple tests</option>
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93 </param>
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94 </inputs>
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95 <outputs>
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7
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96 <data format="tabular" name="out_edgeR" label="${title}_topTable_edgeR.xls">
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9
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97 <filter>edgeR['doedgeR'] == "T"</filter>
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7
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98 </data>
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99 <data format="tabular" name="out_DESeq2" label="${title}_topTable_DESeq2.xls">
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9
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100 <filter>DESeq2['doDESeq2'] == "T"</filter>
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7
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101 </data>
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102 <data format="tabular" name="out_VOOM" label="${title}_topTable_VOOM.xls">
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103 <filter>doVoom == "T"</filter>
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104 </data>
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105 <data format="html" name="html_file" label="${title}.html"/>
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106 </outputs>
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107 <stdio>
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108 <exit_code range="4" level="fatal" description="Number of subject ids must match total number of samples in the input matrix" />
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109 </stdio>
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110 <tests>
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111 <test>
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112 <param name='input1' value='test_bams2mx.xls' ftype='tabular' />
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113 <param name='treatment_name' value='case' />
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114 <param name='title' value='edgeRtest' />
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115 <param name='useNDF' value='' />
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116 <param name='doedgeR' value='T' />
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117 <param name='doVoom' value='T' />
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118 <param name='doDESeq2' value='T' />
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119 <param name='fdrtype' value='fdr' />
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120 <param name='edgeR_priordf' value="8" />
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121 <param name='fdrthresh' value="0.05" />
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122 <param name='control_name' value='control' />
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123 <param name='subjectids' value='' />
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124 <param name='Treat_cols' value='3,4,5,9' />
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125 <param name='Control_cols' value='2,6,7,8' />
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8
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126 <output name='out_edgeR' file='edgeRtest1out.xls' compare='diff' />
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0
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127 <output name='html_file' file='edgeRtest1out.html' compare='diff' lines_diff='20' />
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128 </test>
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129 </tests>
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130
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131 <configfiles>
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132 <configfile name="runme">
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133 <![CDATA[
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134 #
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135 # edgeR.Rscript
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136 # updated npv 2011 for R 2.14.0 and edgeR 2.4.0 by ross
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137 # Performs DGE on a count table containing n replicates of two conditions
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138 #
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139 # Parameters
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140 #
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141 # 1 - Output Dir
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142
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143 # Original edgeR code by: S.Lunke and A.Kaspi
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144 reallybig = log10(.Machine\$double.xmax)
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145 reallysmall = log10(.Machine\$double.xmin)
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146 library('stringr')
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147 library('gplots')
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148 library('edgeR')
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149 hmap2 = function(cmat,nsamp=100,outpdfname='heatmap2.pdf', TName='Treatment',group=NA,myTitle='title goes here')
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150 {
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151 # Perform clustering for significant pvalues after controlling FWER
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152 samples = colnames(cmat)
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153 gu = unique(group)
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154 if (length(gu) == 2) {
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155 col.map = function(g) {if (g==gu[1]) "#FF0000" else "#0000FF"}
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156 pcols = unlist(lapply(group,col.map))
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157 } else {
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158 colours = rainbow(length(gu),start=0,end=4/6)
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159 pcols = colours[match(group,gu)] }
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160 gn = rownames(cmat)
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161 dm = cmat[(! is.na(gn)),]
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162 # remove unlabelled hm rows
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163 nprobes = nrow(dm)
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164 # sub = paste('Showing',nprobes,'contigs ranked for evidence of differential abundance')
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165 if (nprobes > nsamp) {
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166 dm =dm[1:nsamp,]
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167 #sub = paste('Showing',nsamp,'contigs ranked for evidence for differential abundance out of',nprobes,'total')
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168 }
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169 newcolnames = substr(colnames(dm),1,20)
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170 colnames(dm) = newcolnames
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171 pdf(outpdfname)
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172 heatmap.2(dm,main=myTitle,ColSideColors=pcols,col=topo.colors(100),dendrogram="col",key=T,density.info='none',
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173 Rowv=F,scale='row',trace='none',margins=c(8,8),cexRow=0.4,cexCol=0.5)
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174 dev.off()
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175 }
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176
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177 hmap = function(cmat,nmeans=4,outpdfname="heatMap.pdf",nsamp=250,TName='Treatment',group=NA,myTitle="Title goes here")
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178 {
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179 # for 2 groups only was
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180 #col.map = function(g) {if (g==TName) "#FF0000" else "#0000FF"}
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181 #pcols = unlist(lapply(group,col.map))
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182 gu = unique(group)
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183 colours = rainbow(length(gu),start=0.3,end=0.6)
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184 pcols = colours[match(group,gu)]
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185 nrows = nrow(cmat)
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186 mtitle = paste(myTitle,'Heatmap: n contigs =',nrows)
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187 if (nrows > nsamp) {
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188 cmat = cmat[c(1:nsamp),]
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189 mtitle = paste('Heatmap: Top ',nsamp,' DE contigs (of ',nrows,')',sep='')
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190 }
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191 newcolnames = substr(colnames(cmat),1,20)
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192 colnames(cmat) = newcolnames
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193 pdf(outpdfname)
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194 heatmap(cmat,scale='row',main=mtitle,cexRow=0.3,cexCol=0.4,Rowv=NA,ColSideColors=pcols)
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195 dev.off()
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196 }
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197
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198 qqPlot = function(descr='qqplot',pvector, outpdf='qqplot.pdf',...)
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199 # stolen from https://gist.github.com/703512
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200 {
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201 o = -log10(sort(pvector,decreasing=F))
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202 e = -log10( 1:length(o)/length(o) )
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203 o[o==-Inf] = reallysmall
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204 o[o==Inf] = reallybig
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205 maint = descr
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206 pdf(outpdf)
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207 plot(e,o,pch=19,cex=1, main=maint, ...,
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208 xlab=expression(Expected~~-log[10](italic(p))),
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209 ylab=expression(Observed~~-log[10](italic(p))),
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210 xlim=c(0,max(e)), ylim=c(0,max(o)))
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211 lines(e,e,col="red")
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212 grid(col = "lightgray", lty = "dotted")
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213 dev.off()
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214 }
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215
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216 smearPlot = function(DGEList,deTags, outSmear, outMain)
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217 {
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218 pdf(outSmear)
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219 plotSmear(DGEList,de.tags=deTags,main=outMain)
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220 grid(col="lightgray", lty="dotted")
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221 dev.off()
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222 }
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223
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224 boxPlot = function(rawrs,cleanrs,maint,myTitle,pdfname)
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225 { #
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226 nc = ncol(rawrs)
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227 for (i in c(1:nc)) {rawrs[(rawrs[,i] < 0),i] = NA}
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228 fullnames = colnames(rawrs)
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229 newcolnames = substr(colnames(rawrs),1,20)
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230 colnames(rawrs) = newcolnames
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231 newcolnames = substr(colnames(cleanrs),1,20)
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232 colnames(cleanrs) = newcolnames
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233 defpar = par(no.readonly=T)
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234 print.noquote('raw contig counts by sample:')
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235 print.noquote(summary(rawrs))
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236 print.noquote('normalised contig counts by sample:')
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237 print.noquote(summary(cleanrs))
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238 pdf(pdfname)
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239 par(mfrow=c(1,2))
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240 boxplot(rawrs,varwidth=T,notch=T,ylab='log contig count',col="maroon",las=3,cex.axis=0.35,main=paste('Raw:',maint))
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241 grid(col="lightgray",lty="dotted")
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242 boxplot(cleanrs,varwidth=T,notch=T,ylab='log contig count',col="maroon",las=3,cex.axis=0.35,main=paste('After ',maint))
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243 grid(col="lightgray",lty="dotted")
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244 dev.off()
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245 pdfname = "sample_counts_histogram.pdf"
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246 nc = ncol(rawrs)
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247 print.noquote(paste('Using ncol rawrs=',nc))
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248 ncroot = round(sqrt(nc))
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249 if (ncroot*ncroot < nc) { ncroot = ncroot + 1 }
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250 m = c()
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251 for (i in c(1:nc)) {
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252 rhist = hist(rawrs[,i],breaks=100,plot=F)
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253 m = append(m,max(rhist\$counts))
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254 }
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255 ymax = max(m)
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256 pdf(pdfname)
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257 par(mfrow=c(ncroot,ncroot))
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258 for (i in c(1:nc)) {
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259 hist(rawrs[,i], main=paste("Contig logcount",i), xlab='log raw count', col="maroon",
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260 breaks=100,sub=fullnames[i],cex=0.8,ylim=c(0,ymax))
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261 }
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262 dev.off()
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263 par(defpar)
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264
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265 }
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266
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267 cumPlot = function(rawrs,cleanrs,maint,myTitle)
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268 { # updated to use ecdf
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269 pdfname = "Filtering_rowsum_bar_charts.pdf"
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270 defpar = par(no.readonly=T)
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271 lrs = log(rawrs,10)
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272 lim = max(lrs)
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273 pdf(pdfname)
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274 par(mfrow=c(2,1))
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275 hist(lrs,breaks=100,main=paste('Before:',maint),xlab="# Reads (log)",
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276 ylab="Count",col="maroon",sub=myTitle, xlim=c(0,lim),las=1)
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277 grid(col="lightgray", lty="dotted")
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278 lrs = log(cleanrs,10)
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279 hist(lrs,breaks=100,main=paste('After:',maint),xlab="# Reads (log)",
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280 ylab="Count",col="maroon",sub=myTitle,xlim=c(0,lim),las=1)
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281 grid(col="lightgray", lty="dotted")
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282 dev.off()
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283 par(defpar)
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284 }
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285
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286 cumPlot1 = function(rawrs,cleanrs,maint,myTitle)
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287 { # updated to use ecdf
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288 pdfname = paste(gsub(" ","", myTitle , fixed=TRUE),"RowsumCum.pdf",sep='_')
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289 pdf(pdfname)
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290 par(mfrow=c(2,1))
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291 lastx = max(rawrs)
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292 rawe = knots(ecdf(rawrs))
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293 cleane = knots(ecdf(cleanrs))
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294 cy = 1:length(cleane)/length(cleane)
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295 ry = 1:length(rawe)/length(rawe)
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296 plot(rawe,ry,type='l',main=paste('Before',maint),xlab="Log Contig Total Reads",
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297 ylab="Cumulative proportion",col="maroon",log='x',xlim=c(1,lastx),sub=myTitle)
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298 grid(col="blue")
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299 plot(cleane,cy,type='l',main=paste('After',maint),xlab="Log Contig Total Reads",
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300 ylab="Cumulative proportion",col="maroon",log='x',xlim=c(1,lastx),sub=myTitle)
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301 grid(col="blue")
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302 dev.off()
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303 }
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304
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305
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306
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307 doGSEA = function(y=NULL,design=NULL,histgmt="",
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308 bigmt="/data/genomes/gsea/3.1/Abetterchoice_nocgp_c2_c3_c5_symbols_all.gmt",
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309 ntest=0, myTitle="myTitle", outfname="GSEA.xls", minnin=5, maxnin=2000,fdrthresh=0.05,fdrtype="BH")
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310 {
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311 sink('Camera.log')
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312 genesets = c()
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313 if (bigmt > "")
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314 {
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315 bigenesets = readLines(bigmt)
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316 genesets = bigenesets
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317 }
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318 if (histgmt > "")
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319 {
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320 hgenesets = readLines(histgmt)
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321 if (bigmt > "") {
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322 genesets = rbind(genesets,hgenesets)
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|
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323 } else {
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324 genesets = hgenesets
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|
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325 } # use only history if no bi
|
|
|
326 }
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327 print.noquote(paste("@@@read",length(genesets), 'genesets from',histgmt,bigmt))
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|
328 genesets = strsplit(genesets,'\t') # tabular. genesetid\tURLorwhatever\tgene_1\t..\tgene_n
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329 outf = outfname
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330 head=paste(myTitle,'edgeR GSEA')
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331 write(head,file=outfname,append=F)
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332 ntest=length(genesets)
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333 urownames = toupper(rownames(y))
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334 upcam = c()
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335 downcam = c()
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336 for (i in 1:ntest) {
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337 gs = unlist(genesets[i])
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338 g = gs[1] # geneset_id
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339 u = gs[2]
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340 if (u > "") { u = paste("<a href=\'",u,"\'>",u,"</a>",sep="") }
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341 glist = gs[3:length(gs)] # member gene symbols
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342 glist = toupper(glist)
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343 inglist = urownames %in% glist
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344 nin = sum(inglist)
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|
345 if ((nin > minnin) && (nin < maxnin)) {
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346 ### print(paste('@@found',sum(inglist),'genes in glist'))
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347 camres = camera(y=y,index=inglist,design=design)
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|
348 if (! is.null(camres)) {
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349 rownames(camres) = g # gene set name
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350 camres = cbind(GeneSet=g,URL=u,camres)
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351 if (camres\$Direction == "Up")
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352 {
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353 upcam = rbind(upcam,camres) } else {
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354 downcam = rbind(downcam,camres)
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355 }
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|
|
356 }
|
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|
357 }
|
|
|
358 }
|
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|
359 uscam = upcam[order(upcam\$PValue),]
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|
|
360 unadjp = uscam\$PValue
|
|
|
361 uscam\$adjPValue = p.adjust(unadjp,method=fdrtype)
|
|
|
362 nup = max(10,sum((uscam\$adjPValue < fdrthresh)))
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|
363 dscam = downcam[order(downcam\$PValue),]
|
|
|
364 unadjp = dscam\$PValue
|
|
|
365 dscam\$adjPValue = p.adjust(unadjp,method=fdrtype)
|
|
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366 ndown = max(10,sum((dscam\$adjPValue < fdrthresh)))
|
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|
367 write.table(uscam,file=paste('camera_up',outfname,sep='_'),quote=F,sep='\t',row.names=F)
|
|
|
368 write.table(dscam,file=paste('camera_down',outfname,sep='_'),quote=F,sep='\t',row.names=F)
|
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|
369 print.noquote(paste('@@@@@ Camera up top',nup,'gene sets:'))
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|
370 write.table(head(uscam,nup),file="",quote=F,sep='\t',row.names=F)
|
|
|
371 print.noquote(paste('@@@@@ Camera down top',ndown,'gene sets:'))
|
|
|
372 write.table(head(dscam,ndown),file="",quote=F,sep='\t',row.names=F)
|
|
|
373 sink()
|
|
|
374 }
|
|
|
375
|
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376
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|
|
377
|
|
12
|
378 edgeIt = function (Count_Matrix=c(),group=c(),out_edgeR=F,out_VOOM=F,out_DESeq2=F,fdrtype='fdr',priordf=5,
|
|
0
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379 fdrthresh=0.05,outputdir='.', myTitle='Differential Counts',libSize=c(),useNDF=F,
|
|
|
380 filterquantile=0.2, subjects=c(),mydesign=NULL,
|
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|
381 doDESeq2=T,doVoom=T,doCamera=T,doedgeR=T,org='hg19',
|
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|
382 histgmt="", bigmt="/data/genomes/gsea/3.1/Abetterchoice_nocgp_c2_c3_c5_symbols_all.gmt",
|
|
|
383 doCook=F,DESeq_fitType="parameteric")
|
|
|
384 {
|
|
|
385 # Error handling
|
|
|
386 if (length(unique(group))!=2){
|
|
|
387 print("Number of conditions identified in experiment does not equal 2")
|
|
|
388 q()
|
|
|
389 }
|
|
|
390 require(edgeR)
|
|
|
391 options(width = 512)
|
|
|
392 mt = paste(unlist(strsplit(myTitle,'_')),collapse=" ")
|
|
|
393 allN = nrow(Count_Matrix)
|
|
|
394 nscut = round(ncol(Count_Matrix)/2)
|
|
|
395 colTotmillionreads = colSums(Count_Matrix)/1e6
|
|
|
396 counts.dataframe = as.data.frame(c())
|
|
|
397 rawrs = rowSums(Count_Matrix)
|
|
|
398 nonzerod = Count_Matrix[(rawrs > 0),] # remove all zero count genes
|
|
|
399 nzN = nrow(nonzerod)
|
|
|
400 nzrs = rowSums(nonzerod)
|
|
|
401 zN = allN - nzN
|
|
|
402 print('# Quantiles for non-zero row counts:',quote=F)
|
|
|
403 print(quantile(nzrs,probs=seq(0,1,0.1)),quote=F)
|
|
13
|
404 if (useNDF == T)
|
|
0
|
405 {
|
|
|
406 gt1rpin3 = rowSums(Count_Matrix/expandAsMatrix(colTotmillionreads,dim(Count_Matrix)) >= 1) >= nscut
|
|
|
407 lo = colSums(Count_Matrix[!gt1rpin3,])
|
|
|
408 workCM = Count_Matrix[gt1rpin3,]
|
|
|
409 cleanrs = rowSums(workCM)
|
|
|
410 cleanN = length(cleanrs)
|
|
|
411 meth = paste( "After removing",length(lo),"contigs with fewer than ",nscut," sample read counts >= 1 per million, there are",sep="")
|
|
|
412 print(paste("Read",allN,"contigs. Removed",zN,"contigs with no reads.",meth,cleanN,"contigs"),quote=F)
|
|
|
413 maint = paste('Filter >=1/million reads in >=',nscut,'samples')
|
|
|
414 } else {
|
|
|
415 useme = (nzrs > quantile(nzrs,filterquantile))
|
|
|
416 workCM = nonzerod[useme,]
|
|
|
417 lo = colSums(nonzerod[!useme,])
|
|
|
418 cleanrs = rowSums(workCM)
|
|
|
419 cleanN = length(cleanrs)
|
|
|
420 meth = paste("After filtering at count quantile =",filterquantile,", there are",sep="")
|
|
|
421 print(paste('Read',allN,"contigs. Removed",zN,"with no reads.",meth,cleanN,"contigs"),quote=F)
|
|
|
422 maint = paste('Filter below',filterquantile,'quantile')
|
|
|
423 }
|
|
|
424 cumPlot(rawrs=rawrs,cleanrs=cleanrs,maint=maint,myTitle=myTitle)
|
|
|
425 allgenes = rownames(workCM)
|
|
|
426 reg = "^chr([0-9]+):([0-9]+)-([0-9]+)"
|
|
|
427 genecards="<a href=\'http://www.genecards.org/index.php?path=/Search/keyword/"
|
|
|
428 ucsc = paste("<a href=\'http://genome.ucsc.edu/cgi-bin/hgTracks?db=",org,sep='')
|
|
|
429 testreg = str_match(allgenes,reg)
|
|
|
430 if (sum(!is.na(testreg[,1]))/length(testreg[,1]) > 0.8) # is ucsc style string
|
|
|
431 {
|
|
|
432 print("@@ using ucsc substitution for urls")
|
|
|
433 contigurls = paste0(ucsc,"&position=chr",testreg[,2],":",testreg[,3],"-",testreg[,4],"\'>",allgenes,"</a>")
|
|
|
434 } else {
|
|
|
435 print("@@ using genecards substitution for urls")
|
|
|
436 contigurls = paste0(genecards,allgenes,"\'>",allgenes,"</a>")
|
|
|
437 }
|
|
|
438 print.noquote("# urls")
|
|
|
439 print.noquote(head(contigurls))
|
|
|
440 print(paste("# Total low count contigs per sample = ",paste(lo,collapse=',')),quote=F)
|
|
|
441 cmrowsums = rowSums(workCM)
|
|
|
442 TName=unique(group)[1]
|
|
|
443 CName=unique(group)[2]
|
|
|
444 if (is.null(mydesign)) {
|
|
|
445 if (length(subjects) == 0)
|
|
|
446 {
|
|
|
447 mydesign = model.matrix(~group)
|
|
|
448 }
|
|
|
449 else {
|
|
|
450 subjf = factor(subjects)
|
|
|
451 mydesign = model.matrix(~subjf+group) # we block on subject so make group last to simplify finding it
|
|
|
452 }
|
|
|
453 }
|
|
|
454 print.noquote(paste('Using samples:',paste(colnames(workCM),collapse=',')))
|
|
|
455 print.noquote('Using design matrix:')
|
|
|
456 print.noquote(mydesign)
|
|
|
457 if (doedgeR) {
|
|
|
458 sink('edgeR.log')
|
|
|
459 #### Setup DGEList object
|
|
|
460 DGEList = DGEList(counts=workCM, group = group)
|
|
|
461 DGEList = calcNormFactors(DGEList)
|
|
|
462
|
|
|
463 DGEList = estimateGLMCommonDisp(DGEList,mydesign)
|
|
|
464 comdisp = DGEList\$common.dispersion
|
|
|
465 DGEList = estimateGLMTrendedDisp(DGEList,mydesign)
|
|
|
466 if (edgeR_priordf > 0) {
|
|
|
467 print.noquote(paste("prior.df =",edgeR_priordf))
|
|
|
468 DGEList = estimateGLMTagwiseDisp(DGEList,mydesign,prior.df = edgeR_priordf)
|
|
|
469 } else {
|
|
|
470 DGEList = estimateGLMTagwiseDisp(DGEList,mydesign)
|
|
|
471 }
|
|
|
472 DGLM = glmFit(DGEList,design=mydesign)
|
|
|
473 DE = glmLRT(DGLM,coef=ncol(DGLM\$design)) # always last one - subject is first if needed
|
|
|
474 efflib = DGEList\$samples\$lib.size*DGEList\$samples\$norm.factors
|
|
|
475 normData = (1e+06*DGEList\$counts/efflib)
|
|
|
476 uoutput = cbind(
|
|
|
477 Name=as.character(rownames(DGEList\$counts)),
|
|
|
478 DE\$table,
|
|
|
479 adj.p.value=p.adjust(DE\$table\$PValue, method=fdrtype),
|
|
|
480 Dispersion=DGEList\$tagwise.dispersion,totreads=cmrowsums,normData,
|
|
|
481 DGEList\$counts
|
|
|
482 )
|
|
|
483 soutput = uoutput[order(DE\$table\$PValue),] # sorted into p value order - for quick toptable
|
|
|
484 goodness = gof(DGLM, pcutoff=fdrthresh)
|
|
|
485 if (sum(goodness\$outlier) > 0) {
|
|
|
486 print.noquote('GLM outliers:')
|
|
|
487 print(paste(rownames(DGLM)[(goodness\$outlier)],collapse=','),quote=F)
|
|
|
488 } else {
|
|
|
489 print('No GLM fit outlier genes found\n')
|
|
|
490 }
|
|
|
491 z = limma::zscoreGamma(goodness\$gof.statistic, shape=goodness\$df/2, scale=2)
|
|
|
492 pdf("edgeR_GoodnessofFit.pdf")
|
|
|
493 qq = qqnorm(z, panel.first=grid(), main="tagwise dispersion")
|
|
|
494 abline(0,1,lwd=3)
|
|
|
495 points(qq\$x[goodness\$outlier],qq\$y[goodness\$outlier], pch=16, col="maroon")
|
|
|
496 dev.off()
|
|
|
497 estpriorn = getPriorN(DGEList)
|
|
|
498 print(paste("Common Dispersion =",comdisp,"CV = ",sqrt(comdisp),"getPriorN = ",estpriorn),quote=F)
|
|
|
499 efflib = DGEList\$samples\$lib.size*DGEList\$samples\$norm.factors
|
|
|
500 normData = (1e+06*DGEList\$counts/efflib)
|
|
|
501 uniqueg = unique(group)
|
|
|
502 #### Plot MDS
|
|
|
503 sample_colors = match(group,levels(group))
|
|
|
504 sampleTypes = levels(factor(group))
|
|
|
505 print.noquote(sampleTypes)
|
|
|
506 pdf("edgeR_MDSplot.pdf")
|
|
|
507 plotMDS.DGEList(DGEList,main=paste("edgeR MDS for",myTitle),cex=0.5,col=sample_colors,pch=sample_colors)
|
|
|
508 legend(x="topleft", legend = sampleTypes,col=c(1:length(sampleTypes)), pch=19)
|
|
|
509 grid(col="blue")
|
|
|
510 dev.off()
|
|
|
511 colnames(normData) = paste( colnames(normData),'N',sep="_")
|
|
|
512 print(paste('Raw sample read totals',paste(colSums(nonzerod,na.rm=T),collapse=',')))
|
|
|
513 nzd = data.frame(log(nonzerod + 1e-2,10))
|
|
|
514 boxPlot(rawrs=nzd,cleanrs=log(normData,10),maint='TMM Normalisation',myTitle=myTitle,pdfname="edgeR_raw_norm_counts_box.pdf")
|
|
13
|
515 write.table(soutput,file=out_edgeR, quote=FALSE, sep="\t",row.names=F)
|
|
0
|
516 tt = cbind(
|
|
|
517 Name=as.character(rownames(DGEList\$counts)),
|
|
|
518 DE\$table,
|
|
|
519 adj.p.value=p.adjust(DE\$table\$PValue, method=fdrtype),
|
|
|
520 Dispersion=DGEList\$tagwise.dispersion,totreads=cmrowsums
|
|
|
521 )
|
|
|
522 print.noquote("# edgeR Top tags\n")
|
|
|
523 tt = cbind(tt,URL=contigurls) # add to end so table isn't laid out strangely
|
|
|
524 tt = tt[order(DE\$table\$PValue),]
|
|
|
525 print.noquote(tt[1:50,])
|
|
|
526 deTags = rownames(uoutput[uoutput\$adj.p.value < fdrthresh,])
|
|
|
527 nsig = length(deTags)
|
|
|
528 print(paste('#',nsig,'tags significant at adj p=',fdrthresh),quote=F)
|
|
|
529 deColours = ifelse(deTags,'red','black')
|
|
|
530 pdf("edgeR_BCV_vs_abundance.pdf")
|
|
|
531 plotBCV(DGEList, cex=0.3, main="Biological CV vs abundance")
|
|
|
532 dev.off()
|
|
|
533 dg = DGEList[order(DE\$table\$PValue),]
|
|
|
534 #normData = (1e+06 * dg\$counts/expandAsMatrix(dg\$samples\$lib.size, dim(dg)))
|
|
|
535 efflib = dg\$samples\$lib.size*dg\$samples\$norm.factors
|
|
|
536 normData = (1e+06*dg\$counts/efflib)
|
|
22
|
537 outpdfname="edgeR_top_100_heatmap.pdf"
|
|
|
538 hmap2(normData,nsamp=100,TName=TName,group=group,outpdfname=outpdfname,myTitle=paste('edgeR Heatmap',myTitle))
|
|
0
|
539 outSmear = "edgeR_smearplot.pdf"
|
|
|
540 outMain = paste("Smear Plot for ",TName,' Vs ',CName,' (FDR@',fdrthresh,' N = ',nsig,')',sep='')
|
|
|
541 smearPlot(DGEList=DGEList,deTags=deTags, outSmear=outSmear, outMain = outMain)
|
|
16
|
542 qqPlot(descr=paste(myTitle,'edgeR adj p QQ plot'),pvector=tt\$adj.p.value,outpdf='edgeR_qqplot.pdf')
|
|
0
|
543 norm.factor = DGEList\$samples\$norm.factors
|
|
|
544 topresults.edgeR = soutput[which(soutput\$adj.p.value < fdrthresh), ]
|
|
|
545 edgeRcountsindex = which(allgenes %in% rownames(topresults.edgeR))
|
|
|
546 edgeRcounts = rep(0, length(allgenes))
|
|
|
547 edgeRcounts[edgeRcountsindex] = 1 # Create venn diagram of hits
|
|
|
548 sink()
|
|
|
549 } ### doedgeR
|
|
|
550 if (doDESeq2 == T)
|
|
|
551 {
|
|
|
552 sink("DESeq2.log")
|
|
|
553 # DESeq2
|
|
|
554 require('DESeq2')
|
|
|
555 library('RColorBrewer')
|
|
|
556 pdata = data.frame(Name=colnames(workCM),Rx=group,row.names=colnames(workCM))
|
|
|
557 deSEQds = DESeqDataSetFromMatrix(countData = workCM, colData = pdata, design = formula(~ Rx))
|
|
|
558 #DESeq2 = DESeq(deSEQds,fitType='local',pAdjustMethod=fdrtype)
|
|
|
559 #rDESeq = results(DESeq2)
|
|
|
560 #newCountDataSet(workCM, group)
|
|
|
561 deSeqDatsizefac = estimateSizeFactors(deSEQds)
|
|
|
562 deSeqDatdisp = estimateDispersions(deSeqDatsizefac,fitType=DESeq_fitType)
|
|
|
563 resDESeq = nbinomWaldTest(deSeqDatdisp, pAdjustMethod=fdrtype)
|
|
|
564 rDESeq = as.data.frame(results(resDESeq))
|
|
|
565 rDESeq = cbind(Contig=rownames(workCM),rDESeq,NReads=cmrowsums,URL=contigurls)
|
|
|
566 srDESeq = rDESeq[order(rDESeq\$pvalue),]
|
|
16
|
567 qqPlot(descr=paste(myTitle,'DESeq2 adj p qq plot'),pvector=rDESeq\$padj,outpdf='DESeq2_qqplot.pdf')
|
|
0
|
568 cat("# DESeq top 50\n")
|
|
|
569 print.noquote(srDESeq[1:50,])
|
|
13
|
570 write.table(srDESeq,file=out_DESeq2, quote=FALSE, sep="\t",row.names=F)
|
|
0
|
571 topresults.DESeq = rDESeq[which(rDESeq\$padj < fdrthresh), ]
|
|
|
572 DESeqcountsindex = which(allgenes %in% rownames(topresults.DESeq))
|
|
|
573 DESeqcounts = rep(0, length(allgenes))
|
|
|
574 DESeqcounts[DESeqcountsindex] = 1
|
|
|
575 pdf("DESeq2_dispersion_estimates.pdf")
|
|
|
576 plotDispEsts(resDESeq)
|
|
|
577 dev.off()
|
|
|
578 ysmall = abs(min(rDESeq\$log2FoldChange))
|
|
|
579 ybig = abs(max(rDESeq\$log2FoldChange))
|
|
|
580 ylimit = min(4,ysmall,ybig)
|
|
|
581 pdf("DESeq2_MA_plot.pdf")
|
|
|
582 plotMA(resDESeq,main=paste(myTitle,"DESeq2 MA plot"),ylim=c(-ylimit,ylimit))
|
|
|
583 dev.off()
|
|
22
|
584 rlogres = rlogTransformation(sresDESeq)
|
|
0
|
585 sampledists = dist( t( assay(rlogres) ) )
|
|
|
586 sdmat = as.matrix(sampledists)
|
|
|
587 pdf("DESeq2_sample_distance_plot.pdf")
|
|
|
588 heatmap.2(sdmat,trace="none",main=paste(myTitle,"DESeq2 sample distances"),
|
|
|
589 col = colorRampPalette( rev(brewer.pal(9, "RdBu")) )(255))
|
|
|
590 dev.off()
|
|
22
|
591 outpdfname="DESeq2_top100_heatmap.pdf"
|
|
|
592 hmap2(rlogres,nsamp=100,TName=TName,group=group,outpdfname=outpdfname,myTitle=paste('DESeq2 Heatmap',myTitle))
|
|
0
|
593 sink()
|
|
|
594 result = try( (ppca = plotPCA( varianceStabilizingTransformation(deSeqDatdisp,blind=T), intgroup=c("Rx","Name")) ) )
|
|
|
595 if ("try-error" %in% class(result)) {
|
|
|
596 print.noquote('DESeq2 plotPCA failed.')
|
|
|
597 } else {
|
|
|
598 pdf("DESeq2_PCA_plot.pdf")
|
|
|
599 #### wtf - print? Seems needed to get this to work
|
|
|
600 print(ppca)
|
|
|
601 dev.off()
|
|
|
602 }
|
|
|
603 }
|
|
|
604
|
|
|
605 if (doVoom == T) {
|
|
|
606 sink('VOOM.log')
|
|
10
|
607 if (doedgeR == F) {
|
|
|
608 #### Setup DGEList object
|
|
|
609 DGEList = DGEList(counts=workCM, group = group)
|
|
|
610 DGEList = calcNormFactors(DGEList)
|
|
|
611 DGEList = estimateGLMCommonDisp(DGEList,mydesign)
|
|
|
612 DGEList = estimateGLMTrendedDisp(DGEList,mydesign)
|
|
|
613 DGEList = estimateGLMTagwiseDisp(DGEList,mydesign)
|
|
11
|
614 DGEList = estimateGLMTagwiseDisp(DGEList,mydesign)
|
|
|
615 norm.factor = DGEList\$samples\$norm.factors
|
|
10
|
616 }
|
|
0
|
617 pdf("VOOM_mean_variance_plot.pdf")
|
|
|
618 dat.voomed = voom(DGEList, mydesign, plot = TRUE, lib.size = colSums(workCM) * norm.factor)
|
|
|
619 dev.off()
|
|
|
620 # Use limma to fit data
|
|
|
621 fit = lmFit(dat.voomed, mydesign)
|
|
|
622 fit = eBayes(fit)
|
|
|
623 rvoom = topTable(fit, coef = length(colnames(mydesign)), adj = fdrtype, n = Inf, sort="none")
|
|
16
|
624 qqPlot(descr=paste(myTitle,'VOOM-limma adj p QQ plot'),pvector=rvoom\$adj.P.Val,outpdf='VOOM_qqplot.pdf')
|
|
0
|
625 rownames(rvoom) = rownames(workCM)
|
|
|
626 rvoom = cbind(rvoom,NReads=cmrowsums,URL=contigurls)
|
|
|
627 srvoom = rvoom[order(rvoom\$P.Value),]
|
|
13
|
628 cat("# VOOM top 50\n")
|
|
|
629 print(srvoom[1:50,])
|
|
|
630 write.table(srvoom,file=out_VOOM, quote=FALSE, sep="\t",row.names=F)
|
|
0
|
631 # Use an FDR cutoff to find interesting samples for edgeR, DESeq and voom/limma
|
|
|
632 topresults.voom = srvoom[which(rvoom\$adj.P.Val < fdrthresh), ]
|
|
|
633 voomcountsindex = which(allgenes %in% topresults.voom\$ID)
|
|
|
634 voomcounts = rep(0, length(allgenes))
|
|
|
635 voomcounts[voomcountsindex] = 1
|
|
|
636 sink()
|
|
|
637 }
|
|
|
638
|
|
|
639 if (doCamera) {
|
|
|
640 doGSEA(y=DGEList,design=mydesign,histgmt=histgmt,bigmt=bigmt,ntest=20,myTitle=myTitle,
|
|
|
641 outfname=paste(mt,"GSEA.xls",sep="_"),fdrthresh=fdrthresh,fdrtype=fdrtype)
|
|
|
642 }
|
|
|
643
|
|
|
644 if ((doDESeq2==T) || (doVoom==T) || (doedgeR==T)) {
|
|
|
645 if ((doVoom==T) && (doDESeq2==T) && (doedgeR==T)) {
|
|
|
646 vennmain = paste(mt,'Voom,edgeR and DESeq2 overlap at FDR=',fdrthresh)
|
|
|
647 counts.dataframe = data.frame(edgeR = edgeRcounts, DESeq2 = DESeqcounts,
|
|
|
648 VOOM_limma = voomcounts, row.names = allgenes)
|
|
|
649 } else if ((doDESeq2==T) && (doedgeR==T)) {
|
|
|
650 vennmain = paste(mt,'DESeq2 and edgeR overlap at FDR=',fdrthresh)
|
|
|
651 counts.dataframe = data.frame(edgeR = edgeRcounts, DESeq2 = DESeqcounts, row.names = allgenes)
|
|
|
652 } else if ((doVoom==T) && (doedgeR==T)) {
|
|
|
653 vennmain = paste(mt,'Voom and edgeR overlap at FDR=',fdrthresh)
|
|
|
654 counts.dataframe = data.frame(edgeR = edgeRcounts, VOOM_limma = voomcounts, row.names = allgenes)
|
|
|
655 }
|
|
|
656
|
|
|
657 if (nrow(counts.dataframe > 1)) {
|
|
|
658 counts.venn = vennCounts(counts.dataframe)
|
|
|
659 vennf = "Venn_significant_genes_overlap.pdf"
|
|
|
660 pdf(vennf)
|
|
|
661 vennDiagram(counts.venn,main=vennmain,col="maroon")
|
|
|
662 dev.off()
|
|
|
663 }
|
|
|
664 } #### doDESeq2 or doVoom
|
|
|
665
|
|
|
666 }
|
|
|
667 #### Done
|
|
|
668
|
|
|
669 ###sink(stdout(),append=T,type="message")
|
|
|
670 builtin_gmt=""
|
|
|
671 history_gmt=""
|
|
7
|
672 out_edgeR = F
|
|
|
673 out_DESeq2 = F
|
|
14
|
674 out_VOOM = "$out_VOOM"
|
|
0
|
675 doDESeq2 = $DESeq2.doDESeq2 # make these T or F
|
|
|
676 doVoom = $doVoom
|
|
|
677 doCamera = F
|
|
|
678 doedgeR = $edgeR.doedgeR
|
|
|
679 edgeR_priordf = 0
|
|
|
680
|
|
13
|
681
|
|
14
|
682 #if $doVoom == "T":
|
|
|
683 out_VOOM = "$out_VOOM"
|
|
0
|
684 #end if
|
|
13
|
685
|
|
14
|
686 #if $DESeq2.doDESeq2 == "T":
|
|
|
687 out_DESeq2 = "$out_DESeq2"
|
|
|
688 DESeq_fitType = "$DESeq2.DESeq_fitType"
|
|
0
|
689 #end if
|
|
13
|
690
|
|
14
|
691 #if $edgeR.doedgeR == "T":
|
|
|
692 out_edgeR = "$out_edgeR"
|
|
|
693 edgeR_priordf = $edgeR.edgeR_priordf
|
|
7
|
694 #end if
|
|
0
|
695
|
|
17
|
696 if (sum(c(doedgeR,doVoom,doDESeq2)) == 0)
|
|
|
697 {
|
|
|
698 write("No methods chosen - nothing to do! Please try again after choosing one or more methods", stderr())
|
|
18
|
699 quit(save="no",status=2)
|
|
17
|
700 }
|
|
|
701
|
|
0
|
702 Out_Dir = "$html_file.files_path"
|
|
|
703 Input = "$input1"
|
|
|
704 TreatmentName = "$treatment_name"
|
|
|
705 TreatmentCols = "$Treat_cols"
|
|
|
706 ControlName = "$control_name"
|
|
|
707 ControlCols= "$Control_cols"
|
|
|
708 org = "$input1.dbkey"
|
|
|
709 if (org == "") { org = "hg19"}
|
|
|
710 fdrtype = "$fdrtype"
|
|
|
711 fdrthresh = $fdrthresh
|
|
13
|
712 useNDF = $useNDF
|
|
0
|
713 fQ = $fQ # non-differential centile cutoff
|
|
|
714 myTitle = "$title"
|
|
|
715 subjects = c($subjectids)
|
|
|
716 nsubj = length(subjects)
|
|
|
717 TCols = as.numeric(strsplit(TreatmentCols,",")[[1]])-1
|
|
|
718 CCols = as.numeric(strsplit(ControlCols,",")[[1]])-1
|
|
|
719 cat('Got TCols=')
|
|
|
720 cat(TCols)
|
|
|
721 cat('; CCols=')
|
|
|
722 cat(CCols)
|
|
|
723 cat('\n')
|
|
|
724 useCols = c(TCols,CCols)
|
|
|
725 if (file.exists(Out_Dir) == F) dir.create(Out_Dir)
|
|
|
726 Count_Matrix = read.table(Input,header=T,row.names=1,sep='\t') #Load tab file assume header
|
|
|
727 snames = colnames(Count_Matrix)
|
|
|
728 nsamples = length(snames)
|
|
|
729 if (nsubj > 0 & nsubj != nsamples) {
|
|
|
730 options("show.error.messages"=T)
|
|
|
731 mess = paste('Fatal error: Supplied subject id list',paste(subjects,collapse=','),
|
|
|
732 'has length',nsubj,'but there are',nsamples,'samples',paste(snames,collapse=','))
|
|
|
733 write(mess, stderr())
|
|
|
734 quit(save="no",status=4)
|
|
|
735 }
|
|
|
736
|
|
|
737 Count_Matrix = Count_Matrix[,useCols] ### reorder columns
|
|
|
738 if (length(subjects) != 0) {subjects = subjects[useCols]}
|
|
|
739 rn = rownames(Count_Matrix)
|
|
|
740 islib = rn %in% c('librarySize','NotInBedRegions')
|
|
|
741 LibSizes = Count_Matrix[subset(rn,islib),][1] # take first
|
|
|
742 Count_Matrix = Count_Matrix[subset(rn,! islib),]
|
|
|
743 group = c(rep(TreatmentName,length(TCols)), rep(ControlName,length(CCols)) ) #Build a group descriptor
|
|
|
744 group = factor(group, levels=c(ControlName,TreatmentName))
|
|
|
745 colnames(Count_Matrix) = paste(group,colnames(Count_Matrix),sep="_") #Relable columns
|
|
13
|
746 results = edgeIt(Count_Matrix=Count_Matrix,group=group, out_edgeR=out_edgeR, out_VOOM=out_VOOM, out_DESeq2=out_DESeq2,
|
|
0
|
747 fdrtype='BH',priordf=edgeR_priordf,fdrthresh=0.05,outputdir='.',
|
|
|
748 myTitle=myTitle,useNDF=F,libSize=c(),filterquantile=fQ,subjects=c(),
|
|
|
749 doDESeq2=doDESeq2,doVoom=doVoom,doCamera=doCamera,doedgeR=doedgeR,org=org,
|
|
|
750 histgmt=history_gmt,bigmt=builtin_gmt,DESeq_fitType=DESeq_fitType)
|
|
|
751 sessionInfo()
|
|
|
752 ]]>
|
|
|
753 </configfile>
|
|
|
754 </configfiles>
|
|
|
755 <help>
|
|
|
756
|
|
|
757 ----
|
|
|
758
|
|
|
759 **What it does**
|
|
|
760
|
|
|
761 Allows short read sequence counts from controlled experiments to be analysed for differentially expressed genes.
|
|
|
762 Optionally adds a term for subject if not all samples are independent or if some other factor needs to be blocked in the design.
|
|
|
763
|
|
|
764 **Input**
|
|
|
765
|
|
|
766 Requires a count matrix as a tabular file. These are best made using the companion HTSeq_ based counter Galaxy wrapper
|
|
|
767 and your fave gene model to generate inputs. Each row is a genomic feature (gene or exon eg) and each column the
|
|
|
768 non-negative integer count of reads from one sample overlapping the feature.
|
|
|
769 The matrix must have a header row uniquely identifying the source samples, and unique row names in
|
|
|
770 the first column. Typically the row names are gene symbols or probe ids for downstream use in GSEA and other methods.
|
|
|
771
|
|
|
772 **Specifying comparisons**
|
|
|
773
|
|
|
774 This is basically dumbed down for two factors - case vs control.
|
|
|
775
|
|
|
776 More complex interfaces are possible but painful at present.
|
|
|
777 Probably need to specify a phenotype file to do this better.
|
|
|
778 Work in progress. Send code.
|
|
|
779
|
|
|
780 If you have (eg) paired samples and wish to include a term in the GLM to account for some other factor (subject in the case of paired samples),
|
|
|
781 put a comma separated list of indicators for every sample (whether modelled or not!) indicating (eg) the subject number or
|
|
|
782 A list of integers, one for each subject or an empty string if samples are all independent.
|
|
|
783 If not empty, there must be exactly as many integers in the supplied integer list as there are columns (samples) in the count matrix.
|
|
|
784 Integers for samples that are not in the analysis *must* be present in the string as filler even if not used.
|
|
|
785
|
|
|
786 So if you have 2 pairs out of 6 samples, you need to put in unique integers for the unpaired ones
|
|
|
787 eg if you had 6 samples with the first two independent but the second and third pairs each being from independent subjects. you might use
|
|
|
788 8,9,1,1,2,2
|
|
|
789 as subject IDs to indicate two paired samples from the same subject in columns 3/4 and 5/6
|
|
|
790
|
|
|
791 **Methods available**
|
|
|
792
|
|
|
793 You can run 3 popular Bioconductor packages available for count data.
|
|
|
794
|
|
|
795 edgeR - see edgeR_ for details
|
|
|
796
|
|
|
797 VOOM/limma - see limma_VOOM_ for details
|
|
|
798
|
|
|
799 DESeq2 - see DESeq2_ for details
|
|
|
800
|
|
|
801 and optionally camera in edgeR which works better if MSigDB is installed.
|
|
|
802
|
|
|
803 **Outputs**
|
|
|
804
|
|
|
805 Some helpful plots and analysis results. Note that most of these are produced using R code
|
|
|
806 suggested by the excellent documentation and vignettes for the Bioconductor
|
|
|
807 packages invoked. The Tool Factory is used to automatically lay these out for you to enjoy.
|
|
|
808
|
|
16
|
809 **Note on Voom**
|
|
|
810
|
|
|
811 The voom from limma version 3.16.6 help in R includes this from the authors - but you should read the paper to interpret this method.
|
|
|
812
|
|
|
813 This function is intended to process RNA-Seq or ChIP-Seq data prior to linear modelling in limma.
|
|
|
814
|
|
|
815 voom is an acronym for mean-variance modelling at the observational level.
|
|
|
816 The key concern is to estimate the mean-variance relationship in the data, then use this to compute appropriate weights for each observation.
|
|
|
817 Count data almost show non-trivial mean-variance relationships. Raw counts show increasing variance with increasing count size, while log-counts typically show a decreasing mean-variance trend.
|
|
|
818 This function estimates the mean-variance trend for log-counts, then assigns a weight to each observation based on its predicted variance.
|
|
|
819 The weights are then used in the linear modelling process to adjust for heteroscedasticity.
|
|
|
820
|
|
|
821 In an experiment, a count value is observed for each tag in each sample. A tag-wise mean-variance trend is computed using lowess.
|
|
|
822 The tag-wise mean is the mean log2 count with an offset of 0.5, across samples for a given tag.
|
|
|
823 The tag-wise variance is the quarter-root-variance of normalized log2 counts per million values with an offset of 0.5, across samples for a given tag.
|
|
|
824 Tags with zero counts across all samples are not included in the lowess fit. Optional normalization is performed using normalizeBetweenArrays.
|
|
|
825 Using fitted values of log2 counts from a linear model fit by lmFit, variances from the mean-variance trend were interpolated for each observation.
|
|
|
826 This was carried out by approxfun. Inverse variance weights can be used to correct for mean-variance trend in the count data.
|
|
|
827
|
|
|
828
|
|
|
829 Author(s)
|
|
|
830
|
|
|
831 Charity Law and Gordon Smyth
|
|
|
832
|
|
|
833 References
|
|
|
834
|
|
|
835 Law, CW (2013). Precision weights for gene expression analysis. PhD Thesis. University of Melbourne, Australia.
|
|
|
836
|
|
|
837 Law, CW, Chen, Y, Shi, W, Smyth, GK (2013). Voom! Precision weights unlock linear model analysis tools for RNA-seq read counts.
|
|
|
838 Technical Report 1 May 2013, Bioinformatics Division, Walter and Eliza Hall Institute of Medical Reseach, Melbourne, Australia.
|
|
|
839 http://www.statsci.org/smyth/pubs/VoomPreprint.pdf
|
|
|
840
|
|
|
841 See Also
|
|
|
842
|
|
|
843 A voom case study is given in the edgeR User's Guide.
|
|
|
844
|
|
|
845 vooma is a similar function but for microarrays instead of RNA-seq.
|
|
|
846
|
|
|
847
|
|
0
|
848 ***old rant on changes to Bioconductor package variable names between versions***
|
|
|
849
|
|
|
850 The edgeR authors made a small cosmetic change in the name of one important variable (from p.value to PValue)
|
|
|
851 breaking this and all other code that assumed the old name for this variable,
|
|
|
852 between edgeR2.4.4 and 2.4.6 (the version for R 2.14 as at the time of writing).
|
|
|
853 This means that all code using edgeR is sensitive to the version. I think this was a very unwise thing
|
|
|
854 to do because it wasted hours of my time to track down and will similarly cost other edgeR users dearly
|
|
|
855 when their old scripts break. This tool currently now works with 2.4.6.
|
|
|
856
|
|
|
857 **Note on prior.N**
|
|
|
858
|
|
|
859 http://seqanswers.com/forums/showthread.php?t=5591 says:
|
|
|
860
|
|
|
861 *prior.n*
|
|
|
862
|
|
|
863 The value for prior.n determines the amount of smoothing of tagwise dispersions towards the common dispersion.
|
|
|
864 You can think of it as like a "weight" for the common value. (It is actually the weight for the common likelihood
|
|
|
865 in the weighted likelihood equation). The larger the value for prior.n, the more smoothing, i.e. the closer your
|
|
|
866 tagwise dispersion estimates will be to the common dispersion. If you use a prior.n of 1, then that gives the
|
|
|
867 common likelihood the weight of one observation.
|
|
|
868
|
|
|
869 In answer to your question, it is a good thing to squeeze the tagwise dispersions towards a common value,
|
|
|
870 or else you will be using very unreliable estimates of the dispersion. I would not recommend using the value that
|
|
|
871 you obtained from estimateSmoothing()---this is far too small and would result in virtually no moderation
|
|
|
872 (squeezing) of the tagwise dispersions. How many samples do you have in your experiment?
|
|
|
873 What is the experimental design? If you have few samples (less than 6) then I would suggest a prior.n of at least 10.
|
|
|
874 If you have more samples, then the tagwise dispersion estimates will be more reliable,
|
|
|
875 so you could consider using a smaller prior.n, although I would hesitate to use a prior.n less than 5.
|
|
|
876
|
|
|
877
|
|
|
878 From Bioconductor Digest, Vol 118, Issue 5, Gordon writes:
|
|
|
879
|
|
|
880 Dear Dorota,
|
|
|
881
|
|
|
882 The important settings are prior.df and trend.
|
|
|
883
|
|
|
884 prior.n and prior.df are related through prior.df = prior.n * residual.df,
|
|
|
885 and your experiment has residual.df = 36 - 12 = 24. So the old setting of
|
|
|
886 prior.n=10 is equivalent for your data to prior.df = 240, a very large
|
|
|
887 value. Going the other way, the new setting of prior.df=10 is equivalent
|
|
|
888 to prior.n=10/24.
|
|
|
889
|
|
|
890 To recover old results with the current software you would use
|
|
|
891
|
|
|
892 estimateTagwiseDisp(object, prior.df=240, trend="none")
|
|
|
893
|
|
|
894 To get the new default from old software you would use
|
|
|
895
|
|
|
896 estimateTagwiseDisp(object, prior.n=10/24, trend=TRUE)
|
|
|
897
|
|
|
898 Actually the old trend method is equivalent to trend="loess" in the new
|
|
|
899 software. You should use plotBCV(object) to see whether a trend is
|
|
|
900 required.
|
|
|
901
|
|
|
902 Note you could also use
|
|
|
903
|
|
|
904 prior.n = getPriorN(object, prior.df=10)
|
|
|
905
|
|
|
906 to map between prior.df and prior.n.
|
|
|
907
|
|
|
908 ----
|
|
|
909
|
|
|
910 **Attributions**
|
|
|
911
|
|
|
912 edgeR - edgeR_
|
|
|
913
|
|
|
914 VOOM/limma - limma_VOOM_
|
|
|
915
|
|
|
916 DESeq2 - DESeq2_ for details
|
|
|
917
|
|
|
918 See above for Bioconductor package documentation for packages exposed in Galaxy by this tool and app store package.
|
|
|
919
|
|
|
920 Galaxy_ (that's what you are using right now!) for gluing everything together
|
|
|
921
|
|
|
922 Otherwise, all code and documentation comprising this tool was written by Ross Lazarus and is
|
|
|
923 licensed to you under the LGPL_ like other rgenetics artefacts
|
|
|
924
|
|
|
925 .. _LGPL: http://www.gnu.org/copyleft/lesser.html
|
|
|
926 .. _HTSeq: http://www-huber.embl.de/users/anders/HTSeq/doc/index.html
|
|
|
927 .. _edgeR: http://www.bioconductor.org/packages/release/bioc/html/edgeR.html
|
|
|
928 .. _DESeq2: http://www.bioconductor.org/packages/release/bioc/html/DESeq2.html
|
|
|
929 .. _limma_VOOM: http://www.bioconductor.org/packages/release/bioc/html/limma.html
|
|
|
930 .. _Galaxy: http://getgalaxy.org
|
|
|
931 </help>
|
|
|
932
|
|
|
933 </tool>
|
|
|
934
|
|
|
935
|
