Expression and network analysis of Illumina microarray data

doi:10.1038/nprot.2009.215

Method Article

Expression and network analysis of Illumina microarray data

https://doi.org/10.1038/nprot.2009.215

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Biotechnology

Biochemistry

micorarrays

network analysis

functional genomics

Microarrays are commonly used tools for assessing changes in gene expression between two populations. Many algorithms exist for analyzing the hybridization signals from theses arrays. Here, we present our code for assessing changes in expression from samples hybridized to Illumina whole genome microarrays. We also include our code for building weighted gene coexpression networks. Finally, we present how we determined the overlap from two independent microarray studies.

Requires a personal computer running R/Bioconductor.

###This code is for analyzing the SH-SY5Y data from Illumina Human Ref8-v2 arrays using R ###The following abbreviations are used: V= control cells; WT= cells overexpressing human FOXP2; M12= cells overexpressing chimp FOXP2

Load packages

library (Biobase)

library(marray)

library (limma)

library(RColorBrewer)

library(MASS)

library(gplots)

###Read in the dataset

###samples not included in this paper are excluded

load(“line1367_noM125_justdata.R”)

mydata<-mydata[,-c(13:24)] #excluding line3

detsco<-detsco[,-c(13:24)] #excluding line3

sds<-sds[,-c(13:24)] #excluding line3

beads<-beads[,-c(13:24)] #excluding line3

Samples<-Samples[-c(13:24),] #excluding line3

matriz <- as.matrix(mydata)

ROWlabels<-as.character(paste(Samples$Condition, Samples$CellLine, Samples$Replicate, sep=”_”))

phD <- Samples[,c(1,3,4,5)]

rownames(phD)<-ROWlabels

metadata<-data.frame(labelDescription=c(“Array”, “Condition”, “Replicate”, “CellLine”), row.names=c(“Array”, “Condition”, “Replicate”, “cellLine”))

pD<-new("AnnotatedDataFrame",data=phD, varMetadata=metadata)

###Load the Illumina microarray annotations

ill.array <- read.csv(file="C:/Documents and Settings/dhglab.NEURODH/Desktop/Chip info/HumanRef-8_V2_11223162_B.csv", header=T)

###Normalize between arrays

matrizQ <-normalizeBetweenArrays(matriz,method="quantile")

###Apply Combat

samName<-labls

combat.list<- as.data.frame(cbind(samName, Samples[,9], Samples[,3]))

colnames(combat.list)<- c("Sample", "Batch", “Condition”)

write.xls(matrizQ,file="ComBatExpr.xls", quote=F)

write.xls(combat.list,file="ComBatList.txt",quote=F)

source("C:/Documents and Settings/dhglab.NEURODH/Desktop/Study/ComBat.R",local=T)

ComBat("ComBatExpr.xls","ComBatList.txt")

###Create the exprSet object

#Read in Combat adjusted data

matrizQ_adj<-read.table("Adjusted_ComBatExpr_1cond.xls", header=T)

rownames(matrizQ_adj)<- rownames(matriz)

matrizQ_adj<-as.matrix(matrizQ_adj)

eSet <- new("ExpressionSet", exprs=matrizQ_adj, phenoData=pD)

eSet

ftdexp<-exprs(eSet)

###Compare experimental conditions

#all samples

all.samples<-as.data.frame(ftdexp)

#ratios for heatmap and ratio output

#selecting the coefficients for single arrays

#1. Controls

all.contr.wt<-all.samples[,Samples$Condition ==”WT”]

all.contrM.wt<-rowMeans(all.contr.wt)

all.contr.v<-all.samples[,Samples$Condition ==”V”]

all.contrM.v<-rowMeans(all.contr.v)

#2. Exp

all.exp.wt<-all.samples[,Samples$Condition ==”WT”]

all.exp.m12<-all.samples[,Samples$Condition ==”M12”]

#3. Ratios

all.coef.WTV <-all.exp.wt-all.contrM.v

colnames(all.coef.WTV)<-paste(“vsV”, colnames(all.coef.WTV), sep=”.”)

all.coef.M12V<-all.exp.m12-all.contrM.v

colnames(all.coef.M12V)<-paste(“vsV”, colnames(all.coef.M12V), sep=”.”)

all.coef.M12WT<-all.exp.m12-all.contrM.wt

colnames(all.coef.M12WT)<-paste(“vsWT”, colnames(all.coef.M12WT), sep=”.”)

#export the data

mydata2<-cbind(rownames(all.coef.WTV), all.coef.WTV, all.coef.M12V, all.coef.M12WT)

ill.array.nodup<-ill.array[!duplicated(ill.array$Target),]

my.all.data<- merge(mydata2,ill.array.nodup, by.x="Target",by.y="Target")

mydata3<-cbind(rownames(all.samples),all.samples)

colnames(mydata3)1<-"Target"

colnames(mydata3)[2:length(mydata3)]<- paste(colnames(mydata3)[2:length(mydata3)],"exp",sep=".")

my.all.data.new<-merge(my.all.data,mydata3,by.x="Target",by.y="Target")

write.xls(my.all.data.new,"Line167/rm_alldata_ratio_line167.xls",quote=F)

###Fit the data to a linear model

TS<- Samples$Condition

TS <- factor(TS, levels=unique(TS))

design <- model.matrix(~0+TS)

colnames(design) <- levels(TS)

fit<- lmFit(eSet, design)

cont.anova <- makeContrasts(WTvsV.L167= WT – V,

M12vsV.L167= M12 – V,

M12vsWT.L167= M12 – WT,

levels=design)

fit2.anova<- contrasts.fit(fit, cont.anova)

fitb<- eBayes(fit2.anova)

###Implement a statistical threshold:

chosen.adjust<-"none"

chosen.p<-0.05

current.contrast<-"contrast"

results<-decideTests(fit2.anova,adjust.method=chosen.adjust,p=as.numeric(chosen.p))

write.fit(fitb,file="dummy.xls",adjust=chosen.adjust,results=results)

treat.de<-read.table(file="dummy.xls",head=T)

###Output the data for comparisons

myNames<-names(treat.de)

res.col<- which(regexpr("Res.",myNames)>0)

anovalist<- which(apply(treat.de[,res.col],1,function(x)any(x,na.rm=T)))

treat.de.anova<-treat.de[anovalist,]

fitsel.tre2<-merge(treat.de.anova, ill.array.nodup, by.x="ID",by.y="Target")

colnames(fitsel.tre2)1<-"Target"

fitsel.ratio<-merge(fitsel.tre2,my.all.data.new)

colnames(fitsel.ratio)

myNames <-names(fitsel.ratio)

#selects the relevant columns for output

res.col<- which(regexpr("Res.",myNames)>0)

coefs.col <- which(regexpr("Coef.",myNames)>0)

ts.col<- coefs.col+length(coefs.col)

pvals.col <- which(regexpr("p.value.",myNames)>0)

endcolumns.start<-length(fitsel.ratio)-(length(mydata2)-2)

endcolumns.end<-length(fitsel.ratio)

fitsel.ratio2<-cbind(

Target= fitsel.ratio$Target,

Transcript=fitsel.ratio$Accession,

Symbol=fitsel.ratio$Symbol,

Definition=fitsel.ratio$Definition,

fitsel.ratio[,coefs.col],

fitsel.ratio[,pvals.col],

F=fitsel.ratio$F,

F.p.value=fitsel.ratio$F.p.value,

fitsel.ratio[,res.col],

fitsel.ratio[,ts.col],

ProbeSequence=fitsel.ratio$Probe_Sequence,

Ontology=fitsel.ratio$Ontology,

Synonym=fitsel.ratio$Synonym,

fitsel.ratio[,29: 100]

)

fitsel.ratio2<-fitsel.ratio2[order(fitsel.ratio2$F,decreasing=T),]

out.file<-paste(paste(current.contrast,chosen.adjust,chosen.p,sep="_"),"xls",sep=".")

write.xls(fitsel.ratio2,file=paste(”rm2BE_covariate_”, out.file,sep=""),quote=F)

###Output the complete list of genes

fitsel.treAll<-merge(treat.de, ill.array, by.x="ID",by.y="Target")

colnames(fitsel.treAll)1<-"Target"

fitsel.ratioAll<-merge(fitsel.treAll,my.all.data.new)

myNames <-names(fitsel.ratio)

#selects the relevant columns for output

res.col<- which(regexpr("Res.",myNames)>0)

coefs.col <- which(regexpr("Coef.",myNames)>0)

ts.col<- coefs.col+length(coefs.col)

pvals.col <- which(regexpr("p.value.",myNames)>0)

endcolumns.start<-length(fitsel.ratio)-(length(mydata2)-2)

endcolumns.end<-length(fitsel.ratio)

fitsel.ratioN<-cbind(

Target= fitsel.ratioAll$Target,

Transcript=fitsel.ratioAll$Accession,

Symbol=fitsel.ratioAll$Symbol,

Definition=fitsel.ratioAll$Definition,

fitsel.ratioAll[,coefs.col],

fitsel.ratioAll[,pvals.col],

F=fitsel.ratioAll$F,

F.p.value=fitsel.ratioAll$F.p.value,

fitsel.ratioAll[,res.col],

fitsel.ratioAll[,ts.col],

ProbeSequence=fitsel.ratioAll$Probe_Sequence,

Ontology=fitsel.ratioAll$Ontology,

Synonym=fitsel.ratioAll$Synonym,

fitsel.ratioAll[,29:100]

)

fitsel.ratioN<-fitsel.ratioN[!duplicated(fitsel.ratioN$Target),]

fitsel.ratioN<-fitsel.ratioN[order(fitsel.ratioN$F,decreasing=T),]

write.xls(fitsel.ratioN,file=paste("rm2BE_covariate_genelist_all.xls",sep="/"),quote=F)

###This code is for analyzing the brain tissue data from Illumina Human Ref8-v3 arrays using R ###The following abbreviations are used: FP=frontal pole; caud=caudate nucleus; hipp=hippocampus

Load packages

library (Biobase)

library(marray)

library (limma)

library(RColorBrewer)

library(MASS)

library(gplots)

###Read in the dataset

Samples<-read.delim(file="E:/Study/Human_Solexa_number2/Human_Solexa_Illumina_targets2.txt", header=T)

labls<-as.character(paste(substr(Samples$Status,1,2), Samples$ConditionS, Samples$Replicate, sep=”_”))

phD <- Samples[,c(1,2,3,5)]

rownames(phD)<-labls

metadata<-data.frame(labelDescription=c(“ArrayID”, “Genotype”,“Condition”, “Status”), row.names= c(“ArrayID”, “Genotype”,“Condition”, “Status”))

pD<-new("AnnotatedDataFrame",data=phD, varMetadata=metadata)

illumina71<- read.delim (file="2008_071A_Sample_probe_profile.txt", header=TRUE)

rownames(illumina71)<-illumina71$PROBE_ID

illumina71<-illumina71[,3:74]

illumina43<- read.delim (file="Sample Probe profile 2008-043.txt", header=TRUE)

rownames(illumina43)<-illumina43$PROBE_ID

illumina43<-illumina43[,11:12]

illumina61<- read.delim (file="Sample probe profile 2008-061A.txt", header=TRUE)

rownames(illumina61)<-illumina61$PROBE_ID

illumina61<-illumina61[,3:50]

illumina2<-cbind(illumina61, illumina71) #add 43 later as it has 2 columns

#signal values

nsampl<-40

colnames(illumina2)[seq(1,(nsampl*3),3)]

mydata<-illumina2[,seq(1,(nsampl*3),3)]

mydata2<-cbind(mydata[,1:16], illumina43[,1], mydata[, 17:40])

colnames(mydata2)<-labls

mydata<-mydata2

#detction scores

colnames(illumina2)[seq(1,(nsampl*3),3)+1]

detsco<-illumina2[,seq(1,(nsampl*3),3)+1]

detsco2<-cbind(detsco[,1:16], illumina43[,2], detsco[, 17:40])

detsco<- detsco2

colnames(detsco)<-labls

detsco<-1- detsco #pvalue to real

mydata.notlog<-mydata

mydata=log2(mydata)

matriz <- as.matrix(mydata)

###Load the Illumina microarray annotations

ill.array <- read.csv(file="C:/Documents and Settings/dhglab.NEURODH/Desktop/Chip info/HumanRef-8_V3_0_R0_11282963_A.csv", header=T)

#remove probes that are not a perfect match to either human or chimp genome

bad.probe<-read.table(“E:/Study/Human_Solexa_number2/Bad_Illumina_probes_for_Chimp_comp.txt”, header=T)

dim(bad.probe)

#1 9305 1

dim(mydata)

#1 24526 41

removeProbes = match(bad.probe$PSID, rownames(mydata))

mydata.g<-mydata[-removeProbes,]

detsco.g<-detsco[-removeProbes,]

dim(mydata.g)

15221 41

dim(detsco.g)

save(mydata.g, detsco.g, bad.probe, mydata, file=”good_probes_data”)

matriz<- as.matrix(mydata.g)

###Normalize between arrays

matrizQQ <-normalizeBetweenArrays(matriz,method="quantile")

###Apply Combat

samName<-labls

combat.list<- as.data.frame(cbind(samName, Samples[,7], Samples[,4], Samples[,5]))

colnames(combat.list)<- c("SampleName", "Batch", “Condition”)

write.xls(matrizQ,file="ComBatExpr.xls", quote=F)

write.xls(combat.list,file="ComBatList.txt",quote=F)

source("C:/Documents and Settings/dhglab.NEURODH/Desktop/Study/ComBat.R",local=T)

ComBat("ComBatExpr.xls","ComBatList.txt")

###Create the exprSet object

#Read in Combat adjusted data

matrizQ_adj<-read.table("Adjusted_ComBatExpr.xls", header=T)

rownames(matrizQ_adj)<- rownames(matriz.g)

matrizQ_adj<-as.matrix(matrizQ_adj)

eSet <- new("ExpressionSet", exprs=matrizQ_adj, phenoData=pD.g)

eSet

ftdexp<-exprs(eSet)

###Compare experimental conditions

#all samples

all.samples<-as.data.frame(ftdexp)

#1. Controls, each condition as a control

all.contr.h <-all.samples[,Samples$Status==”human” ]

all.contrM.h <-rowMeans(all.contr.h)

all.contr.hh <-all.samples[,Samples$Status==”human” & Samples$ConditionS==”hipp”]

all.contrM.hh <-rowMeans(all.contr.hh)

all.contr.hc <-all.samples[,Samples$Status==”human” & Samples$ConditionS==”caud”]

all.contrM.hc <-rowMeans(all.contr.hc)

all.contr.hf <-all.samples[,Samples$Status==”human” & Samples$ConditionS==”FP”]

all.contrM.hf <-rowMeans(all.contr.hf)

all.contr.cc <-all.samples[,Samples$Status==”chimp” & Samples$ConditionS==”caud”]

all.contrM.cc <-rowMeans(all.contr.cc)

all.contr.cf <-all.samples[,Samples$Status==”chimp” & Samples$ConditionS==”FP”]

all.contrM.cf <-rowMeans(all.contr.cf)

all.contr.caud <-all.samples[,Samples$ConditionS==”caud”]

all.contrM.caud <-rowMeans(all.contr.caud)

all.contr.fp <-all.samples[,Samples$ConditionS==”FP”]

all.contrM.fp <-rowMeans(all.contr.fp)

#2. Exp, each condition as a treatment

all.exp.c<- all.samples[,Samples$Status==”chimp”]

all.exp.hipp<- all.samples[,Samples$ConditionS==”hipp”]

all.exp.caud<- all.samples[,Samples$ConditionS==”caud”]

all.exp.hh<- all.samples[,Samples$Status==”human” & Samples$ConditionS==”hipp”]

all.exp.hc<- all.samples[,Samples$Status==”human” & Samples$ConditionS==”caud”]

all.exp.ch<- all.samples[,Samples$Status==”chimp” & Samples$ConditionS==”hipp”]

all.exp.cc<- all.samples[,Samples$Status==”chimp” & Samples$ConditionS==”caud”]

all.exp.cf<- all.samples[,Samples$Status==”chimp” & Samples$ConditionS==”FP”]

#3. Ratios

all.coef.hhc<- all.exp.hh - all.contrM.hc

colnames(all.coef.hhc)<-paste(“vsCAUD”, colnames(all.coef.hhc), sep=”.”)

all.coef.hhf<- all.exp.hh - all.contrM.hf

colnames(all.coef.hhf)<-paste(“vsFP”, colnames(all.coef.hhf), sep=”.”)

all.coef.hcf<- all.exp.hc - all.contrM.hf

colnames(all.coef.hcf)<-paste(“vsFP”, colnames(all.coef.hcf), sep=”.”)

all.coef.chc<- all.exp.ch - all.contrM.cc

colnames(all.coef.chc)<-paste(“vsCAUD”, colnames(all.coef.chc), sep=”.”)

all.coef.chf<- all.exp.ch - all.contrM.cf

colnames(all.coef.chf)<-paste(“vsFP”, colnames(all.coef.chf), sep=”.”)

all.coef.ccf<- all.exp.cc - all.contrM.cf

colnames(all.coef.ccf)<-paste(“vsFP”, colnames(all.coef.ccf), sep=”.”)

all.coef.ch.hipp<- all.exp.ch - all.contrM.hh

colnames(all.coef.ch.hipp)<-paste(“CHvsHUM”, colnames(all.coef.ch.hipp), sep=”.”)

all.coef.ch.caud<- all.exp.cc - all.contrM.hc

colnames(all.coef.ch.caud)<-paste(“CHvsHUM”, colnames(all.coef.ch.caud), sep=”.”)

all.coef.ch.fp<- all.exp.cf - all.contrM.hf

colnames(all.coef.ch.fp)<-paste(“CHvsHUM”, colnames(all.coef.ch.fp), sep=”.”)

all.coef.hipp.caud<- all.exp.hipp - all.contrM.caud

colnames(all.coef.hipp.caud)<-paste(“HippvsCaud”, colnames(all.coef.hipp.caud), sep=”.”)

all.coef.hipp.fp<- all.exp.hipp - all.contrM.fp

colnames(all.coef.hipp.fp)<-paste(“HippvsFP”, colnames(all.coef.hipp.fp), sep=”.”)

all.coef.caud.fp<- all.exp.caud - all.contrM.fp

colnames(all.coef.caud.fp)<-paste(“CaudvsFP”, colnames(all.coef.caud.fp), sep=”.”)

all.coef.CH<- all.exp.c - all.contrM.h

colnames(all.coef.CH)<-paste(“CHvsHUM”, colnames(all.coef.CH), sep=”.”)

#export the data

mydata2<-cbind(rownames(all.coef.hhc), all.coef.hhc, all.coef.hhf, all.coef.hcf, all.coef.chc, all.coef.chf, all.coef.ccf, all.coef.ch.hipp, all.coef.ch.caud, all.coef.ch.fp, all.coef.hipp.caud, all.coef.hipp.fp, all.coef.caud.fp, all.coef.CH)

colnames(mydata2)1<-“Target”

ill.array.nodup<-ill.array[!duplicated(ill.array$Probe_Id),]

my.all.data<- merge(mydata2,ill.array.nodup, by.x="Target",by.y="Probe_Id")

mydata3<-cbind(rownames(all.samples),all.samples)

colnames(mydata3)1<-"Target"

colnames(mydata3)[2:length(mydata3)]<- paste(colnames(mydata3)[2:length(mydata3)],"exp",sep=".")

my.all.data.new<-merge(my.all.data,mydata3,by.x="Target",by.y="Target")

ratio_exp<-merge(mydata2,mydata3,by.x="Target",by.y="Target")

write.xls(my.all.data.new,"alldata_ratio.xls",quote=F)

###Fit the data to a linear model

TS<- paste(Samples$Status, Samples$ConditionS, sep=”_”)

TS <- factor(TS, levels=unique(TS))

design <- model.matrix(~0+TS)

colnames(design) <- levels(TS)

fit<- lmFit(eSet, design)

cont.anova <- makeContrasts(HIPPvsCAUD_human= human_hipp – human_caud,

HIPPvsFP_human= human_hipp – human_FP,

CAUDvsFP_human= human_caud – human_FP,

HIPPvsCAUD_chimp= chimp_hipp – chimp_caud,

HIPPvsFP_chimp= chimp_hipp – chimp_FP,

CAUDvsFP_chimp= chimp_caud – chimp_FP,

CHvsHUM_hipp= chimp_hipp – human_hipp,

CHvsHUM_caud= chimp_caud – human_caud,

CHvsHUM_FP= chimp_FP – human_FP,

HIPPvsCAUD = (human_hipp + chimp_hipp)/2 – (human_caud + chimp_caud)/2,

HIPPvsFP = (human_hipp + chimp_hipp)/2 – (human_FP + chimp_FP)/2,

CAUDvsFP = (human_caud + chimp_caud)/2 – (human_FP + chimp_FP)/2,

CHIMPvsHUMAN = (chimp_hipp+ chimp_caud+ chimp_FP)/3 -(human_hipp+ human_caud+ human_FP)/3,

levels=design)

fit2.anova<- contrasts.fit(fit, cont.anova)

fitb<- eBayes(fit2.anova)

###Implement a statistical threshold:

chosen.adjust<-"none"

chosen.p<-0.05

current.contrast<-"contrast"

results<-decideTests(fitb,adjust.method=chosen.adjust,p=as.numeric(chosen.p))

write.fit(fitb,file="dummyrr.xls",adjust=chosen.adjust,results=results)

treat.de<-read.table(file="dummyrr.xls",head=T)

myNames<-names(treat.de)

res.col<- which(regexpr("Res.",myNames)>0)

anovalist<- which(apply(treat.de[,res.col],1,function(x)any(x,na.rm=T)))

treat.de.anova<-treat.de[anovalist,]

ill.array.nodup<-ill.array[!duplicated(ill.array$Probe_Id),]

fitsel.tre2<-merge(treat.de.anova, ill.array.nodup, by.x="ID",by.y="Probe_Id")

colnames(fitsel.tre2)1<-"Probe"

fitsel.ratio<-merge(fitsel.tre2,ratio_exp, by.x=”Probe”, by.y=”Target”)

###Output the data for comparisons

myNames <-names(fitsel.ratio)

#selects the relevant columns for output

res.col<- which(regexpr("Res.",myNames)>0)

coefs.col <- which(regexpr("Coef.",myNames)>0)

ts.col<- coefs.col+length(coefs.col)

pvals.col <- which(regexpr("p.value.",myNames)>0)

endcolumns.start<-length(fitsel.ratio)-(length(mydata2)-2)

endcolumns.end<-length(fitsel.ratio)

fitsel.ratio2<-cbind(

Probe= fitsel.ratio$Probe,

Accession=fitsel.ratio$Accession,

Symbol=fitsel.ratio$Symbol,

Definition=fitsel.ratio$Definition,

fitsel.ratio[,coefs.col],

fitsel.ratio[,pvals.col],

F=fitsel.ratio$F,

F.p.value=fitsel.ratio$F.p.value,

fitsel.ratio[,res.col],

fitsel.ratio[,ts.col],

A= fitsel.ratio$A,

fitsel.ratio[,84:226],

fitsel.ratio[,57:66],

fitsel.ratio[,69:77],

fitsel.ratio[,79:83]

)

fitsel.ratio2<-fitsel.ratio2[order(fitsel.ratio2$F,decreasing=T),]

out.file<-paste(paste(current.contrast,chosen.adjust,chosen.p,sep="_"),"xls",sep=".")

write.xls(fitsel.ratio2, “combat_significant_genelist_0.05.xls”, quote=F)

###Output the complete list of genes

fitsel.treAll<-merge(treat.de, ill.array.nodup, by.x="ID",by.y="Probe_Id")

colnames(fitsel.treAll)1<-"Probe"

fitsel.ratioAll<-merge(fitsel.treAll, ratio_exp, by.x=”Probe”, by.y=”Target”)

myNames <-names(fitsel.ratioAll)

#selects the relevant columns for output

res.col<- which(regexpr("Res.",myNames)>0)

coefs.col <- which(regexpr("Coef.",myNames)>0)

ts.col<- coefs.col+length(coefs.col)

pvals.col <- which(regexpr("p.value.",myNames)>0)

endcolumns.start<-length(fitsel.ratio)-(length(mydata2)-2)

endcolumns.end<-length(fitsel.ratio)

fitsel.ratioN<-cbind(

Probe= fitsel.ratioAll$Probe,

Accession=fitsel.ratioAll$Accession,

Symbol=fitsel.ratioAll$Symbol,

Definition=fitsel.ratioAll$Definition,

fitsel.ratioAll[,coefs.col],

fitsel.ratioAll[,pvals.col],

F=fitsel.ratioAll$F,

F.p.value=fitsel.ratioAll$F.p.value,

fitsel.ratioAll[,res.col],

fitsel.ratioAll[,ts.col],

A= fitsel.ratioAll$A,

fitsel.ratioAll[,84:226],

fitsel.ratioAll[,57:66],

fitsel.ratioAll[,69:77],

fitsel.ratioAll[,79:83]

)

dim(fitsel.ratioN)

fitsel.ratioN<-fitsel.ratioN[order(fitsel.ratioN$F,decreasing=T),]

write.xls(fitsel.ratioN,file= "combat_complete_genelist.xls",quote=F)

###This code is for analyzing the SH-SY5Y microarray data using WGCNA (weighted gene coexpression network analysis) using R ###Paste the following functions into R

PickSoftThreshold=function(datExpr1,RsquaredCut=0.85, powervector=c(seq(1,10,by=1),seq(12,20,by=2)),removeFirst=FALSE,no.breaks=10) {

no.genes <- dim(datExpr1)[2]

no.samples= dim(datExpr1)[1]

colname1=c("Power", "scale law R2" ,"slope", "truncated R2","mean(k)","median(k)","max(k)")

datout=data.frame(matrix(666,nrow=length(powervector),ncol=length(colname1) ))

names(datout)=colname1

datout[,1]=powervector

if(exists("fun1")) rm(fun1)

fun1=function(x) {

corx=abs(cor(x,datExpr1,use="p"))

out1=rep(NA, length(powervector) )

for (j in c(1:length(powervector))) {out1[j]=sum(corx^powervector[j])}

out1

} # end of fun1

datk=t(apply(datExpr1,2,fun1))

for (i in c(1:length(powervector) ) ){

nolinkshelp <- datk[,i]-1

cut2=cut(nolinkshelp,no.breaks)

binned.k=tapply(nolinkshelp,cut2,mean)

freq1=as.vector(tapply(nolinkshelp,cut2,length)/length(nolinkshelp))

The following code corrects for missing values etc

breaks1=seq(from=min(nolinkshelp),to=max(nolinkshelp),length=no.breaks+1)

hist1=hist(nolinkshelp,breaks=breaks1,equidist=F,plot=FALSE,right=TRUE)

binned.k2=hist1$mids

binned.k=ifelse(is.na(binned.k),binned.k2,binned.k)

binned.k=ifelse(binned.k==0,binned.k2,binned.k)

freq1=ifelse(is.na(freq1),0,freq1)

xx= as.vector(log10(binned.k))

if(removeFirst) {freq1=freq1[-1]; xx=xx[-1]}

plot(xx,log10(freq1+.000000001),xlab="log10(k)",ylab="log10(p(k))" )

lm1= lm(as.numeric(log10(freq1+.000000001))~ xx )

lm2=lm(as.numeric(log10(freq1+.000000001))~ xx+I(10^xx) )

datout[i,2]=summary(lm1)$adj.r.squared

datout[i,3]=summary(lm1)$coefficients[2,1]

datout[i,4]=summary(lm2)$adj.r.squared

datout[i,5]=mean(nolinkshelp)

datout[i,6]= median(nolinkshelp)

datout[i,7]= max(nolinkshelp)

}

datout=signif(datout,3)

print(data.frame(datout));

the cut-off is chosen as smallest cut with R^2>RsquaredCut

ind1=datout[,2]>RsquaredCut

indcut=NA

indcut=ifelse(sum(ind1)>0,min(c(1:length(ind1))[ind1]),indcut)

this estimates the power value that should be used.

Don't trust it. You need to consider slope and mean connectivity as well!

power.estimate=powervector[indcut][1]

list(power.estimate, data.frame(datout));

}

TOMdist1=function(adjmat1, maxADJ=FALSE) {

diag(adjmat1)=0;

adjmat1[is.na(adjmat1)]=0;

maxh1=max(as.dist(adjmat1) ); minh1=min(as.dist(adjmat1) );

if (maxh1>1 | minh1 < 0 ) {print(paste("ERROR: the adjacency matrix contains entries that are larger than 1 or smaller than 0!!!, max=",maxh1,", min=",minh1)) } else {

if ( max(c(as.dist(abs(adjmat1-t(adjmat1)))))>0 ) {print("ERROR: non-symmetric adjacency matrix!!!") } else {

kk=apply(adjmat1,2,sum)

maxADJconst=1

if (maxADJ==TRUE) maxADJconst=max(c(as.dist(adjmat1 )))

Dhelp1=matrix(kk,ncol=length(kk),nrow=length(kk))

denomTOM= pmin(as.dist(Dhelp1),as.dist(t(Dhelp1))) +as.dist(maxADJconst-adjmat1);

gc();gc();

numTOM=as.dist(adjmat1 %*% adjmat1 +adjmat1);

#TOMmatrix=numTOM/denomTOM

this turns the TOM matrix into a dissimilarity

out1=1-as.matrix(numTOM/denomTOM)

diag(out1)=1

out1

}

makeNetwork = function(dat,beta,signed=0){

if(signed==0){

a = abs(cor(dat,use="p")^beta)

t = TOMdist1(a)

return(hclust(as.dist(t),method="av"))

}else{

a = cor(dat,use="p")

b = a < 0

a[b] = 0

a = a^beta

t = TOMdist1(a)

return(hclust(as.dist(t),method="av"))

}

cutreeDynamic = function(hierclust, maxTreeHeight=1, deepSplit=TRUE, minModuleSize=50, minAttachModuleSize=100, nameallmodules=FALSE, useblackwhite=FALSE)

{

if(maxTreeHeight >=1){

staticCutCluster = cutTreeStatic(hiercluster=hierclust, heightcutoff=0.99, minsize1=minModuleSize)

}else{

staticCutCluster = cutTreeStatic(hiercluster=hierclust, heightcutoff=maxTreeHeight, minsize1=minModuleSize)

}

#get tree height for every singleton

#node_index tree_height

demdroHeiAll= rbind( cbind(hierclust$merge[,1], hierclust$height), cbind(hierclust$merge[,2], hierclust$height) )

#singletons will stand at the front of the list

myorder = order(demdroHeiAll[,1])

#get # of singletons

no.singletons = length(hierclust$order)

demdroHeiAll.sort = demdroHeiAll[myorder, ]

demdroHei.sort = demdroHeiAll.sort[c(1:no.singletons), ]

demdroHei = demdroHei.sort[seq(no.singletons, 1, by=-1), ]

demdroHei[,1] = -demdroHei[,1]

combine with prelimilary cluster-cutoff results

demdroHei = cbind(demdroHei, as.integer(staticCutCluster))

re-order the order based on the dendrogram order hierclust$order

demdroHei.order = demdroHei[hierclust$order, ]

static.clupos = locateCluster(demdroHei.order[, 3])

if (is.null(static.clupos) ){

module.assign = rep(0, no.singletons)

colcode.reduced = assignModuleColor(module.assign, minsize1=minModuleSize, anameallmodules=nameallmodules, auseblackwhite=useblackwhite)

return ( colcode.reduced )

}

static.no = dim(static.clupos)1

static.clupos2 = static.clupos

static.no2 = static.no

#split individual cluster if there are sub clusters embedded

mcycle=1

while(1==1){

clupos = NULL

for (i in c(1:static.no)){

mydemdroHei.order = demdroHei.order[ c(static.clupos[i,1]:static.clupos[i,2]), ] #index to [1, clusterSize]

mydemdroHei.order[, 1] = mydemdroHei.order[, 1] - static.clupos[i, 1] + 1

#cat("Cycle ", as.character(mcycle), "cluster (", static.clupos[i,1], static.clupos[i,2], ")\n")

#cat("i=", as.character(i), "\n")

iclupos = processInvididualCluster(mydemdroHei.order,

cminModuleSize = minModuleSize,

cminAttachModuleSize = minAttachModuleSize)

iclupos[,1] = iclupos[,1] + static.clupos[i, 1] -1 #recover the original index

iclupos[,2] = iclupos[,2] + static.clupos[i, 1] -1

clupos = rbind(clupos, iclupos) #put in the final output buffer

}

if(deepSplit==FALSE){

break

}

if(dim(clupos)1 != static.no) {

static.clupos = clupos

static.no = dim(static.clupos)1

}else{

break

}

mcycle = mcycle + 1

#static.clupos

}

final.cnt = dim(clupos)1

#assign colors for modules

module.assign = rep(0, no.singletons)

module.cnt=1

for (i in c(1:final.cnt ))

{

sdx = clupos[i, 1] #module start point

edx = clupos[i, 2] #module end point

module.size = edx - sdx +1

if(module.size <minModuleSize){

}

#assign module lable

module.assign[sdx:edx] = rep(module.cnt, module.size)

#update module label for the next module

module.cnt = module.cnt + 1

}

colcode.reduced.order = assignModuleColor(module.assign, minsize1=minModuleSize, anameallmodules=nameallmodules, auseblackwhite=useblackwhite)

recov.order = order( demdroHei.order[,1])

colcode.reduced = colcode.reduced.order[recov.order]

if(1==2){

aveheight = averageSequence(demdroHei.order[,2], 2)

procHei = demdroHei.order[,2]-mean(demdroHei.order[,2])

par(mfrow=c(3,1), mar=c(0,0,0,0) )

plot(h1row, labels=F, xlab="",ylab="",main="",sub="",axes = F)

barplot(procHei,

col= "black", space=0,

border=F,main="", axes = F, axisnames = F)

barplot(height=rep(1, length(colcode.reduced)),

col= as.character(colcode.reduced[h1row$order]), space=0,

border=F,main="", axes = F, axisnames = F)

par(mfrow=c(1,1), mar=c(5, 4, 4, 2) + 0.1)

}

colcode.reduced

}

cutTreeStatic = function(hiercluster,heightcutoff=0.99, minsize1=50) {

here we define modules by using a height cut-off for the branches

labelpred= cutree(hiercluster,h=heightcutoff)

sort1=-sort(-table(labelpred))

sort1

modulename= as.numeric(names(sort1))

modulebranch= sort1 >= minsize1

no.modules=sum(modulebranch)

colorhelp = rep(-1, length(labelpred) )

if ( no.modules==0){

print("No module detected")

}

else{

for (i in c(1:no.modules)) {

colorhelp=ifelse(labelpred==modulename[i],i ,colorhelp)

}

colorhelp

}

locateCluster = function(clusterlabels)

{

no.nodes = length(clusterlabels)

clusterlabels.shift = c(clusterlabels1, c(clusterlabels[1:(no.nodes-1)]) )

#a non-zero point is the start point of a cluster and it previous point is the end point of the previous cluster

label.diff = abs(clusterlabels - clusterlabels.shift)

#process the first and last positions as start/end points if they belong to a cluster instead of no cluster "-1"

if(clusterlabels1 >0) {label.diff1=1}

if(clusterlabels[no.nodes]>0) {label.diff[no.nodes]=1}

flagpoints.bool = label.diff > 0

if( sum(flagpoints.bool) ==0){

return(NULL)

}

flagpoints = c(1:no.nodes)[flagpoints.bool]

no.points = length(flagpoints)

myclupos=NULL

for(i in c(1:(no.points-1)) ){

idx = flagpoints[i]

if(clusterlabels[idx]>0){

myclupos = rbind(myclupos, c(idx, flagpoints[i+1]-1) )

}

myclupos

}

processInvididualCluster = function(clusterDemdroHei, cminModuleSize=50, cminAttachModuleSize=100, minTailRunlength=12, useMean=0){

#for debug: use all genes

#clusterDemdroHei =demdroHei.order

no.cnodes = dim(clusterDemdroHei)1

cmaxhei = max(clusterDemdroHei[, 2])

cminhei = min(clusterDemdroHei[, 2])

cmeanhei = mean(clusterDemdroHei[, 2])

cmidhei = (cmeanhei + cmaxhei)/2.0

cdwnhei = (cmeanhei + cminhei)/2.0

if (useMean==1){

comphei = cmidhei

}else if (useMean==-1){

comphei = cdwnhei

}else{ #normal case

comphei = cmeanhei

}

compute height diffrence with mean height

heidiff = clusterDemdroHei[,2] - comphei

heidiff.shift = shiftSequence(heidiff, -1)

get cut positions

detect the end point of a cluster, whose height should be less than meanhei

and the node behind it is the start point of the next cluster which has a height above meanhei

cuts.bool = (heidiff<0) & (heidiff.shift > 0)

cuts.bool1 = TRUE

cuts.bool[no.cnodes] = TRUE

if(sum(cuts.bool)==2){

if (useMean==0){

new.clupos=processInvididualCluster(clusterDemdroHei=clusterDemdroHei, cminModuleSize=cminModuleSize,

cminAttachModuleSize=cminAttachModuleSize,

useMean=1)

}else if(useMean==1){

new.clupos=processInvididualCluster(clusterDemdroHei=clusterDemdroHei, cminModuleSize=cminModuleSize,

cminAttachModuleSize=cminAttachModuleSize,

useMean=-1)

}else{

new.clupos = rbind(c(1, no.cnodes))

}

return (new.clupos)

}

#a good candidate cluster-end point should have significant # of ahead nodes with head < meanHei

cutindex =c(1:no.cnodes)[cuts.bool]

no.cutps = length(cutindex)

runlens = rep(999, no.cutps)

cuts.bool2 = cuts.bool

for(i in c(2:(no.cutps-1)) ){

seq = c( (cutindex[i-1]+1):cutindex[i] )

runlens[i] = runlengthSign(heidiff[seq], leftOrright=-1, mysign=-1)

if(runlens[i] < minTailRunlength){

#cat("run length=", runlens[i], "\n")

cuts.bool2[ cutindex[i] ] = FALSE

}

#attach SMALL cluster to the left-side BIG cluster if the small one has smaller mean height

cuts.bool3=cuts.bool2

if(sum(cuts.bool2) > 3) {

curj = 2

while (1==1){

cutindex2 =c(1:no.cnodes)[cuts.bool2]

no.clus = length(cutindex2) -1

if (curj>no.clus){

break

}

pre.sdx = cutindex2[ curj-1 ]+1 #previous module start point

pre.edx = cutindex2[ curj ] #previous module end point

pre.module.size = pre.edx - pre.sdx +1

pre.module.hei = mean(clusterDemdroHei[c(pre.sdx:pre.edx) , 2])

cur.sdx = cutindex2[ curj ]+1 #previous module start point

cur.edx = cutindex2[ curj+1 ] #previous module end point

cur.module.size = cur.edx - cur.sdx +1

cur.module.hei = mean(clusterDemdroHei[c(cur.sdx:cur.edx) , 2])

#merge to the leftside major module, don't change the current index "curj"

#if( (pre.module.size >minAttachModuleSize)&(cur.module.hei<pre.module.hei)&(cur.module.size<minAttachModuleSize) ){

if( (cur.module.hei<pre.module.hei)&(cur.module.size<cminAttachModuleSize) ){

cuts.bool2[ cutindex2[curj] ] = FALSE

}else{ #consider next cluster

curj = curj + 1

}

}#while

}#if

cutindex2 =c(1:no.cnodes)[cuts.bool2]

no.cutps = length(cutindex2)

#we don't want to lose the small cluster at the tail, attch it to the previous big cluster

#cat("Lclu= ", cutindex2[no.cutps]-cutindex2[no.cutps-1]+1, "\n")

if(no.cutps > 2){

if( (cutindex2[no.cutps] - cutindex2[no.cutps-1]+1) < cminModuleSize ){

cuts.bool2[ cutindex2[no.cutps-1] ] =FALSE

}

if(1==2){

myseqnce = c(2300:3000)

cutdisp = ifelse(cuts.bool2==T, "red","grey" )

#re-order to the normal one with sequential signleton index

par(mfrow=c(3,1), mar=c(0,0,0,0) )

plot(h1row, labels=F, xlab="",ylab="",main="",sub="",axes = F)

barplot(heidiff[myseqnce],

col= "black", space=0,

border=F,main="", axes = F, axisnames = F)

barplot(height=rep(1, length(cutdisp[myseqnce])),

col= as.character(cutdisp[myseqnce]), space=0,

border=F,main="", axes = F, axisnames = F)

par(mfrow=c(1,1), mar=c(5, 4, 4, 2) + 0.1)

}

cutindex2 = c(1:no.cnodes)[cuts.bool2]

cutindex21=cutindex21-1 #the first

no.cutps2 = length(cutindex2)

if(no.cutps2 > 2){

new.clupos = cbind( cutindex2[c(1:(no.cutps2-1))]+1, cutindex2[c(2:no.cutps2)] )

}else{

new.clupos = cbind( 1, no.cnodes)

}

if ( dim(new.clupos)1 == 1 ){

if (useMean==0){

new.clupos=processInvididualCluster(clusterDemdroHei=clusterDemdroHei, cminModuleSize=cminModuleSize,

cminAttachModuleSize=cminAttachModuleSize,

useMean=1)

}else if(useMean==1){

new.clupos=processInvididualCluster(clusterDemdroHei=clusterDemdroHei, cminModuleSize=cminModuleSize,

cminAttachModuleSize=cminAttachModuleSize,

useMean=-1)

}

new.clupos

}

shiftSequence = function(mysequence, delta){

seqlen = length(mysequence)

if(delta>0){

finalseq=c(mysequence[1:delta], mysequence[1:(seqlen-delta)])

}else{

posdelta = -delta

finalseq=c(mysequence[(posdelta+1):seqlen], mysequence[(seqlen-posdelta+1):seqlen])

}

finalseq

}

runlengthSign = function(mysequence, leftOrright=-1, mysign=-1){

seqlen = length(mysequence)

if(leftOrright<0){

pseq = rev(mysequence)

}else{

pseq = mysequence

}

if(mysign<0){ #see where the first POSITIVE number occurs

nonezero.bool = (pseq > 0)

}else{ #see where the first NEGATIVE number occur

nonezero.bool = (pseq < 0)

}

if( sum(nonezero.bool) > 0){

runlength = min( c(1:seqlen)[nonezero.bool] ) - 1

}else{

runlength = 0

}

assignModuleColor = function(labelpred, minsize1=50, anameallmodules=FALSE, auseblackwhite=FALSE) {

here we define modules by using a height cut-off for the branches

#labelpred= cutree(hiercluster,h=heightcutoff)

#cat(labelpred)

#"0", grey module doesn't participate color assignment, directly assigned as "grey"

labelpredNoZero = labelpred[ labelpred >0 ]

sort1=-sort(-table(labelpredNoZero))

sort1

modulename= as.numeric(names(sort1))

modulebranch= sort1 >= minsize1

no.modules=sum(modulebranch)

now we assume that there are fewer than 10 modules

#colorcode=c#("turquoise","blue","brown","yellow","green","red","black","purple","orange","pink",

#"greenyellow","lightcyan","salmon","midnightblue","lightyellow","chartreuse",

"chocolate","gold","springgreen","tan","violet","plum","aliceblue","aquamarine",

"azure","bisque","burlywood","coral","cornsilk","cyan","darkorchid","deeppink",

"firebrick","forestgreen","gainsboro","wheat")

orderofcolors = order(runif(length(colors())))

colorcode = colors()

colorcode = colorcode[orderofcolors]

notgrey = substr(colorcode,1,4) "gray" | substr(colorcode,1,4) "grey"

colorcode = colorcode[!notgrey]

#"grey" means not in any module;

colorhelp=rep("grey",length(labelpred))

if ( no.modules==0){

print("No module detected\n")

}

else{

if ( no.modules > length(colorcode) ){

print(length(colorcode))

print( paste("Too many modules \n", as.character(no.modules)) )

}

if ( (anameallmodules==FALSE) || (no.modules <=length(colorcode)) ){

labeledModules = min(no.modules, length(colorcode) )

for (i in c(1:labeledModules)) {

colorhelp=ifelse(labelpred==modulename[i],colorcode[i],colorhelp)

}

colorhelp=factor(colorhelp,levels=c(colorcode[1:labeledModules],"grey"))

}else{#nameallmodules==TRUE and no.modules >length(colorcode)

maxcolors=length(colorcode)

labeledModules = no.modules

extracolors=NULL

blackwhite=c("red", "black")

for(i in c((maxcolors+1):no.modules)){

if(auseblackwhite==FALSE){

icolor=paste("module", as.character(i), sep="")

}else{#use balck white alternatively represent extra colors, for display only

#here we use the ordered label to avoid put the same color for two neighboring clusters

icolor=blackwhite[1+(as.integer(modulename[i])%%2) ]

}

extracolors=c(extracolors, icolor)

}

#combine the true-color code and the extra colorcode into a uniform colorcode for

#color assignment

allcolorcode=c(colorcode, extracolors)

for (i in c(1:labeledModules)) {

colorhelp=ifelse(labelpred==modulename[i],allcolorcode[i],colorhelp)

}

colorhelp=factor(colorhelp,levels=c(allcolorcode[1:labeledModules],"grey"))

}

colorhelp

}

hclustplot1=function(hier1,couleur,title1="Colors sorted by hierarchical clustering") {

if (length(hier1$order) != length(couleur) ) {

print("ERROR: length of color vector not compatible with no. of objects in the hierarchical tree")};

if (length(hier1$order) == length(couleur) ) {

barplot(height=rep(1, length(couleur)), col= as.character(couleur[hier1$order]),border=NA, main=title1,space=0, axes=F)}

}

plotDend=function(clust,colorh){

par(mfrow=c(2,1),mar=c(2,2,2,2))

plot(clust,labels=F)

hclustplot1(clust,colorh)

}

MakeVis = function(data,colorMod,vis.dir,pwr1,symbols){

q = table(colorMod)

n = length(q)

for(i in c(1:n)){

if(names(q[i]) != "grey"){

collect_garbage()

newNet = pairwiseCode(data[,colorMod==names(q[i])],filename=paste(vis.dir,names(q[i]),".txt",sep=""),pwr=pwr1,geneAnnot=symbols,this.col=names(q[i]))

print(q[i])

if(!exists("newNetwork")){

newNetwork = newNet

} else {

newNetwork = rbind(newNetwork,newNet)

}

return(newNetwork)

}

MakePlots = function(data,colorMod,plots.dir){

PC = ModulePrinComps1(data,colorMod)

q = table(colorMod)

n = length(q)

u = q > 1

for(i in c(1:n)){

if(u[i]){

c = dimnames(PC[1])[2]

indC = substr(c[i],3,25)

filename = paste(plots.dir,indC,".png",sep="")

png(filename)

showHeat(indC,data,colorMod,PC)

dev.off()

print(paste(filename," printed to file"))

}else{

indC = substr(c[i],3,25)

print(paste(filename," only contains 1 gene"))

}

showHeat = function(color,data,colorh,PC){

q = table(colorh)

z = names(q) == color

Probe_sets = dimnames(data)[2]

par(mfrow=c(2,1),mar=c(2,2,2,2))

par(mar=c(2,3,7,3))

par(oma=c(0,0,2,0))

datcombined=data.frame(rbind(data[,colorh==color]))

samplelabel=as.character(dimnames(data)[1])

plot.mat(t(scale(datcombined)), rlabels=as.character(Probe_sets[colorh==color]), clabels=samplelabel, rcols=color)

par(mar=c(2,2,0,2))

barplot(PC[1][,z],space=0,beside=TRUE,axes=FALSE,col=color)

}

ModulePrinComps1=function(datexpr,couleur) {

modlevels=levels(factor(couleur))

PrinComps=data.frame(matrix(666,nrow=dim(datexpr)[1],ncol= length(modlevels)))

varexplained= data.frame(matrix(666,nrow= 5,ncol= length(modlevels)))

names(PrinComps)=paste("PC",modlevels,sep="")

for(i in c(1:length(modlevels)) ){

print(i)

modulename = modlevels[i]

restrict1= as.character(couleur)== modulename

in the following, rows are genes and columns are samples

datModule=t(datexpr[, restrict1])

datModule=impute.knn(as.matrix(datModule))

datModule=t(scale(t(datModule)))

svd1=svd(datModule)

mtitle=paste("PCs of ", modulename," module", sep="")

varexplained[,i]= (svd1$d[1:5])2/sum(svd1$d2)

this is the first principal component

pc1=svd1$v[,1]

signh1=sign(sum(cor(pc1, t(datModule))))

if (signh1 != 0) pc1=signh1* pc1

PrinComps[,i]= pc1

}

ModuleConformity= rep(666,length=dim(datexpr)[2])

for(i in 1:(dim(datexpr)[2])) ModuleConformity[i]=abs(cor(datexpr[,i], PrinComps[,match(couleur[i], modlevels)], use="pairwise.complete.obs"))

list(PrinComps=PrinComps, varexplained=varexplained, ModuleConformity=ModuleConformity)

}

pairwiseCode = function(vals,filename="forvis.txt",pwr,geneAnnot,links=1000,this.col){

n = dimnames(vals)[2]

newPC = ModulePrinComps1(vals,rep("black",dim(vals)[2]))

newSim = cor(vals,use="p")

newAdj = abs(newSim^pwr)

diag(newAdj) = 0

newDeg = apply(newAdj,1,sum)

newDeg = newDeg/max(newDeg)

newKme = cor(vals,newPC[1][,1],use="p")

newTom = TOMdist1(newAdj)

newTom = 1-newTom

sz = dim(newAdj)[1]

TomList = vector("logical",sz^2)

for(j in c(1:sz)){

TomList[ (((j-1)sz)+1) : ((jsz)) ] = newTom[,j]

}

ord = order(TomList,decreasing=TRUE)

if(length(n) > 33){

len = links

} else {

len = length(n)^2

}

first = ord[1:len] %/% sz + 1

second = ord[1:len] %% sz

sec = second == 0

first[sec] = first[sec]-1

second[sec] = sz

id = geneAnnot[n,2]

datout = matrix(0,len,6)

for(j in c(1:len)){

datout[j,1] = paste(id[first[j]])

datout[j,2] = paste(id[second[j]])

datout[j,3] = 0

if(newSim[first[j],second[j]] > 0){

datout[j,4] = as.character("M0011")

} else {

datout[j,4] = as.character("M0015")

}

datout[j,5] = TomList[ord[j]]

datout[j,6] = newSim[first[j],second[j]]

}

write.table(datout,file=filename,sep="\t")

return(cbind(n,newDeg[n],as.numeric(newKme[n,1]),as.character(geneAnnot[n,2]),this.col))

}

modpcas = function(dat,mod){

q = names(table(mod))

u = vector("list",length(q))

d = vector("list",length(q))

v = vector("list",length(q))

names(u) = q

names(d) = q

names(v) = q

for(i in c(1:length(q))){

b = mod == q[i]

impDat = impute.knn(as.matrix(dat[names(mod[b]),]))

sclDat = t(scale(t(impDat)))

svdDat = svd(sclDat)

for(j in c(1:min(dim(dat))){

signh1 = sign(sum(cor(svdDat$v[,j],t(sclDat))))

if(signh1 != 0){

svdDat$v[,j]=signh1*svdDat$v[,j]

svdDat$u[,j]=signh1*svdDat$u[,j]

}

u[[i]] = svdDat$u

dimnames(u[[i]])[1] = names(mod[b])

d[[i]] = svdDat$d

v[[i]] = svdDat$v

}

return(list(u=u,d=d,v=v))

}

removePC = function(pc,start){

dat = vector("logical",dim(pc$v[1])[1])

for(i in c(1:length(pc$u))){

end = dim(pc$u)[2]

D = diag(pc$d[[i]])

e = pc$u[[i]][,start:end] %% D[start:end,start:end] %% t(pc$v[[i]][,start:end])

dat = rbind(dat,e)

}

return(dat[2:dim(dat)[1],])

}

###Description of variables

normalizedData – the normalized microarray data with genes in rows and samples in columns, should also have gene identifiers for row names

power_to_scale_connections – obtained with guidance from PickSoftThreshold (below), see Zhang et al., (2005) for more information

geneAnnotation – matrix with gene names in the second column and gene identifiers as row names

###Create the co-expression network

PickSoftThreshold(t(normalizedData))

power_to_scale_connections = 6

genesClusteredOnTO = makeNetwork(t(normalizedData),power_to_scale_connections)

###Identify modules and plot dendrogram

genesAssignedToModules = cutreeDynamic(genesClusteredOnTO)

plotDend(genesClusteredOnTO,genesAssignedToModules)

###Plot module heatmaps and make files for VisAnt

MakePlots(normalizedData,genesAssignedToModules,”./heatmaps/”)

Network = MakeVis(normalizedData,genesAssignedToModules,”./visant/”,geneAnnotation,power_to_scale_connections)

write.table(Network,file=”network.csv”,sep=”,”)

###Remove first principal component

names(genesAssignedToModules) = dimnames(normalizedData)[1]

principalComponents = modpcas(normalizedData,genesAssignedToModules)

dataWithoutFirstPrincipalComponent = removePC(principalComponents,2)

###This code is for calculating the hypergeomtric probability of the overlap of two datasets with permutations using R hyperFast = function(pop1,subpop1,pop2,subpop2,perm,b=0){

if(b==1){browser()}

p1 = seq(1,pop1,by=1)

p2 = seq(1,pop2,by=1)

out = vector(mode="logical",perm)

i = 1

while(i < perm){

over = sample(p1,subpop1) %in% sample(p2,subpop2)

if(length(table(over)) > 1){

out[i] = table(over)[2]

} else {

out[i] = 0

}

i = i + 1

}

return(out)

}

x=hyperFast(a,b,c,d,e)

#a=the total number of probesets in the first gene list

#b=the total number of differentially expressed genes in the first gene list

#c=the total number of probesets in the second gene list

#d=the total number of differentially expressed genes in the second gene list

#e=the number of permutations

#to calculate Z-score, use the following, where f=the number of overlapping genes in the two lists:

y=(f-mean(x))/sd(x)

#to calucate a PValue for the Z-score:

z=pnorm(y,log=TRUE)

1-(2^z)

Smyth, G.K., Gentleman, R., Carey, V., Dudoit, S., Irizarry, R., and Huber, W. (2005). Limma: linear models for microarray data. In Bioinformatics and Computational Biology Solutions using R and Bioconductor (Springer), pp. 397-420.

Gentleman, R.C., Carey, V.J., Bates, D.M., Bolstad, B., Dettling, M., Dudoit, S., Ellis, B., Gautier, L., Ge, Y., Gentry, J., et al. (2004). Bioconductor: open software development for computational biology and bioinformatics. Genome Biol, 5.

Zhang, B., and Horvath, S. (2005) A general framework for weighted gene co-expression network analysis. Stat Appl Genet Mol Biol, 4: Article 17.

Langfelder, P., Zhang, B., and Horvath, S. (2008) Defining clusters from a hierarchical cluster tree: the Dynamic Tree Cut package for R. Bioinformatics, 24(5): 719-20.

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Expression and network analysis of Illumina microarray data

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Introduction

Equipment

Procedure

15221 41

The following code corrects for missing values etc

the cut-off is chosen as smallest cut with R^2>RsquaredCut

this estimates the power value that should be used.

Don't trust it. You need to consider slope and mean connectivity as well!

this turns the TOM matrix into a dissimilarity

combine with prelimilary cluster-cutoff results

re-order the order based on the dendrogram order hierclust$order

here we define modules by using a height cut-off for the branches

compute height diffrence with mean height

get cut positions

detect the end point of a cluster, whose height should be less than meanhei

and the node behind it is the start point of the next cluster which has a height above meanhei

here we define modules by using a height cut-off for the branches

now we assume that there are fewer than 10 modules

in the following, rows are genes and columns are samples

this is the first principal component

References

Associated Publications

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