tests/html/complex-demo.md
In perishky/meffil: Efficient algorithms for DNA methylation
Normalize an 450K, EPIC and EPIC v2 dataset
Download example data set
Prickett AR, Ishida M, Böhm S, Frost JM et al. Genome-wide methylation
analysis in Silver-Russell syndrome patients. Hum Genet 2015
Mar;134(3):317-32. PMID: 25563730
Retrieve the data from the Gene Expression Omnibus (GEO) website
(http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE55491).
download.450k.demo.dataset <- function() {
dir.create(path <- "data-450k-demo")
if (length(list.files(path, "*.idat$")) == 0) {
filename <- file.path(path, "gse55491.tar")
download.file("http://www.ncbi.nlm.nih.gov/geo/download/?acc=GSE55491&format=file", filename)
cat(date(), "Extracting files from GEO archive.\n")
system(paste("cd", path, ";", "tar xvf", basename(filename)))
unlink(filename)
cat(date(), "Unzipping IDAT files.\n")
system(paste("cd", path, ";", "gunzip *.idat.gz"))
library(GEOquery)
geo <- getGEO("GSE55491", GSEMatrix=F)
geo <- lapply(geo@gsms, function(gsm) unlist(gsm@header))
geo <- do.call(rbind, geo)
geo <- as.data.frame(geo, stringAsFactors=F)
geo$group <- geo$characteristics_ch13
geo$sex <- geo$characteristics_ch11
write.csv(geo, file=file.path(path, "samples.csv"))
}
path
}
Information about the new EPIC microarray can be obtained here:
http://support.illumina.com/array/array_kits/infinium-methylationepic-beadchip-kit/downloads.html
download.epic.demo.dataset <- function() {
dir.create(path <- "data-epic-demo")
if (length(list.files(path, "*.idat$")) == 0) {
download.zip <- function(url, path) {
filename <- file.path(path, "data.zip")
download.file(url, filename)
filenames <- unzip(filename, junkpaths=T, exdir=path)
unlink(filename)
invisible(filenames)
}
ftp.url <- "ftp://webdata2:webdata2@ussd-ftp.illumina.com/downloads/productfiles/methylationEPIC"
download.zip(file.path(ftp.url, "infinium-methylationepic-demo-dataset.zip"), path)
}
path
}
Information about the new EPIC v2 microarray can be obtained here:
https://www.illumina.com/products/by-type/microarray-kits/infinium-methylation-epic.html
download.epic2.demo.dataset <- function() {
dir.create(path <- "data-epic2-demo")
if (length(list.files(path, "*.idat$")) == 0) {
download.zip <- function(url, path) {
filename <- file.path(path, "data.zip")
download.file(url, filename)
filenames <- unzip(filename, junkpaths=T, exdir=path)
unlink(filename)
invisible(filenames)
}
url <- "https://support.illumina.com/content/dam/illumina-support/documents/downloads/productfiles/methylationepic/DemoDataEPIC_v2.zip"
download.zip(url, file.path(path, "data.zip"))
}
path
}
path.450k <- download.450k.demo.dataset()
path.epic <- download.epic.demo.dataset()
path.epic2 <- download.epic2.demo.dataset()
Normalize dataset
Create samplesheet
library(meffil)
samplesheet.450k <- meffil.create.samplesheet(path=path.450k)
samplesheet.epic <- meffil.read.samplesheet(base=path.epic, pattern="Demo_SampleSheet.csv")
## [read.450k.sheet] Found the following CSV files:
## [1] "data-epic-demo/Demo_SampleSheet.csv"
samplesheet.epic2 <- meffil.read.samplesheet(base=path.epic2, pattern="SampleSheet")
## [read.450k.sheet] Found the following CSV files:
## [1] "data-epic2-demo/Demo_EPIC-8v2-0_A1_SampleSheet_16.csv"
samplesheet.450k$chip <- "450k"
samplesheet.epic$chip <- "epic"
samplesheet.epic2$chip <- "epic2"
common.cols <- intersect(colnames(samplesheet.450k),colnames(samplesheet.epic))
common.cols <- intersect(common.cols, colnames(samplesheet.epic2))
samplesheet <- rbind(
samplesheet.450k[1:10,common.cols],
samplesheet.epic[,common.cols],
samplesheet.epic2[,common.cols])
Parameters.
qc.file <- "complex-demo/qc-report.html"
author <- "Illumina, et al."
study <- "450k/epic/epic2 demo dataset"
number.pcs <- 2
norm.file <- "complex-demo/normalization-report.html"
Generate QC objects.
options(mc.core=20)
qc.objects <- meffil.qc(samplesheet, featureset="450k:epic:epic2", cell.type.reference="blood gse35069 complete", verbose=T)
QC report.
qc.summary <- meffil.qc.summary(qc.objects, verbose=T)
## [meffil.qc.summary] Thu May 11 16:25:07 2023 Sex summary TRUE
## [meffil.qc.summary] Thu May 11 16:25:07 2023 Meth vs unmeth summary
## [meffil.qc.summary] Thu May 11 16:25:07 2023 Control means summary
## [meffil.qc.summary] Thu May 11 16:25:07 2023 Sample detection summary
## [meffil.qc.summary] Thu May 11 16:25:09 2023 CpG detection summary
## [meffil.qc.summary] Thu May 11 16:25:10 2023 Sample bead numbers summary
## [meffil.qc.summary] Thu May 11 16:25:11 2023 CpG bead numbers summary
## [meffil.qc.summary] Thu May 11 16:25:11 2023 Cell count summary
## [meffil.qc.summary] Thu May 11 16:25:11 2023 Genotype concordance
meffil.qc.report(
qc.summary,
output.file=qc.file,
author=author,
study=study)
## [meffil.qc.report] Thu May 11 16:25:11 2023 Writing report as html file to complex-demo/qc-report.html
Normalization dataset.
norm.objects <- meffil.normalize.quantiles(
qc.objects,
number.pcs=number.pcs,
verbose=T)
## [meffil.normalize.quantiles] Thu May 11 16:25:21 2023 selecting dye correction reference
## [meffil.normalize.quantiles] Thu May 11 16:25:21 2023 creating control matrix
## [meffil.normalize.quantiles] Thu May 11 16:25:21 2023 normalizing quantiles
## [FUN] Thu May 11 16:25:21 2023 genomic.iG M
## [FUN] Thu May 11 16:25:21 2023 genomic.iG U
## [FUN] Thu May 11 16:25:21 2023 genomic.iR M
## [FUN] Thu May 11 16:25:21 2023 genomic.iR U
## [FUN] Thu May 11 16:25:21 2023 genomic.ii M
## [FUN] Thu May 11 16:25:21 2023 genomic.ii U
## [FUN] Thu May 11 16:25:21 2023 autosomal.iG M
## [FUN] Thu May 11 16:25:21 2023 autosomal.iG U
## [FUN] Thu May 11 16:25:21 2023 autosomal.iR M
## [FUN] Thu May 11 16:25:21 2023 autosomal.iR U
## [FUN] Thu May 11 16:25:21 2023 autosomal.ii M
## [FUN] Thu May 11 16:25:21 2023 autosomal.ii U
## [FUN] Thu May 11 16:25:21 2023 not.y.iG M
## [FUN] Thu May 11 16:25:22 2023 not.y.iG U
## [FUN] Thu May 11 16:25:22 2023 not.y.iR M
## [FUN] Thu May 11 16:25:22 2023 not.y.iR U
## [FUN] Thu May 11 16:25:22 2023 not.y.ii M
## [FUN] Thu May 11 16:25:22 2023 not.y.ii U
## [FUN] Thu May 11 16:25:22 2023 sex M
## [FUN] Thu May 11 16:25:22 2023 sex U
## [FUN] Thu May 11 16:25:22 2023 chrx M
## [FUN] Thu May 11 16:25:22 2023 chrx U
## [FUN] Thu May 11 16:25:22 2023 chry M
## [FUN] Thu May 11 16:25:22 2023 chry U
beta.meffil <- meffil.normalize.samples(
norm.objects,
just.beta=T,
cpglist.remove=qc.summary$bad.cpgs$name,
verbose=T)
Compute principal components of the normalized methylation matrix.
pcs <- meffil.methylation.pcs(
beta.meffil,
sites=meffil.get.autosomal.sites("epic"),
verbose=T)
## [meffil.methylation.pcs] Thu May 11 16:27:27 2023 Calculating CpG variance
## [meffil.methylation.pcs] Thu May 11 16:27:29 2023 Calculating beta PCs
Normalization report.
parameters <- meffil.normalization.parameters(norm.objects)
parameters$batch.threshold <- 0.01
norm.summary <- meffil.normalization.summary(
norm.objects=norm.objects,
pcs=pcs,
parameters=parameters,
verbose=T)
## [meffil.plot.control.batch] Thu May 11 16:27:29 2023 Extracting batch variables
## [meffil.plot.control.batch] Thu May 11 16:27:29 2023 Testing associations
## [meffil.plot.probe.batch] Thu May 11 16:27:33 2023 Extracting batch variables
## [meffil.plot.probe.batch] Thu May 11 16:27:33 2023 Testing associations
meffil.normalization.report(
norm.summary,
output.file=norm.file,
author=author,
study=study)
## [meffil.normalization.report] Thu May 11 16:27:36 2023 Writing report as html file to complex-demo/normalization-report.html
It looks like the normalized methylation retains
has a strong association with chip.
chip <- samplesheet$chip
stats <- t(apply(pcs,2,function(pc) {
fit <- coef(summary(lm(pc ~ chip)))
fit[which.min(fit[-1,"Pr(>|t|)"])+1,]
}))
stats[stats[,"Pr(>|t|)"] < 0.05,]
## Estimate Std. Error t value Pr(>|t|)
## PC1 90.42404 15.10665 5.985712 2.554382e-06
## PC2 31.68942 12.30709 2.574892 1.606936e-02
## PC3 58.88792 13.92749 4.228180 2.572938e-04
## PC5 27.00016 3.95589 6.825306 3.033529e-07
This isn't surprising given that the data for each
chip comes from a different study.
If there was reason to believe that the the chip
associations were entirely technical,
then we could remove some of this variation
by including 'chip' as a random effect
in the functional normalization.
perishky/meffil documentation built on March 20, 2024, 1:56 a.m.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
Normalize an 450K, EPIC and EPIC v2 dataset
Download example data set
Prickett AR, Ishida M, Böhm S, Frost JM et al. Genome-wide methylation analysis in Silver-Russell syndrome patients. Hum Genet 2015 Mar;134(3):317-32. PMID: 25563730
Retrieve the data from the Gene Expression Omnibus (GEO) website (http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE55491).
download.450k.demo.dataset <- function() {
dir.create(path <- "data-450k-demo")
if (length(list.files(path, "*.idat$")) == 0) {
filename <- file.path(path, "gse55491.tar")
download.file("http://www.ncbi.nlm.nih.gov/geo/download/?acc=GSE55491&format=file", filename)
cat(date(), "Extracting files from GEO archive.\n")
system(paste("cd", path, ";", "tar xvf", basename(filename)))
unlink(filename)
cat(date(), "Unzipping IDAT files.\n")
system(paste("cd", path, ";", "gunzip *.idat.gz"))
library(GEOquery)
geo <- getGEO("GSE55491", GSEMatrix=F)
geo <- lapply(geo@gsms, function(gsm) unlist(gsm@header))
geo <- do.call(rbind, geo)
geo <- as.data.frame(geo, stringAsFactors=F)
geo$group <- geo$characteristics_ch13
geo$sex <- geo$characteristics_ch11
write.csv(geo, file=file.path(path, "samples.csv"))
}
path
}
Information about the new EPIC microarray can be obtained here:
http://support.illumina.com/array/array_kits/infinium-methylationepic-beadchip-kit/downloads.html
download.epic.demo.dataset <- function() {
dir.create(path <- "data-epic-demo")
if (length(list.files(path, "*.idat$")) == 0) {
download.zip <- function(url, path) {
filename <- file.path(path, "data.zip")
download.file(url, filename)
filenames <- unzip(filename, junkpaths=T, exdir=path)
unlink(filename)
invisible(filenames)
}
ftp.url <- "ftp://webdata2:webdata2@ussd-ftp.illumina.com/downloads/productfiles/methylationEPIC"
download.zip(file.path(ftp.url, "infinium-methylationepic-demo-dataset.zip"), path)
}
path
}
Information about the new EPIC v2 microarray can be obtained here:
https://www.illumina.com/products/by-type/microarray-kits/infinium-methylation-epic.html
download.epic2.demo.dataset <- function() {
dir.create(path <- "data-epic2-demo")
if (length(list.files(path, "*.idat$")) == 0) {
download.zip <- function(url, path) {
filename <- file.path(path, "data.zip")
download.file(url, filename)
filenames <- unzip(filename, junkpaths=T, exdir=path)
unlink(filename)
invisible(filenames)
}
url <- "https://support.illumina.com/content/dam/illumina-support/documents/downloads/productfiles/methylationepic/DemoDataEPIC_v2.zip"
download.zip(url, file.path(path, "data.zip"))
}
path
}
path.450k <- download.450k.demo.dataset()
path.epic <- download.epic.demo.dataset()
path.epic2 <- download.epic2.demo.dataset()
Normalize dataset
Create samplesheet
library(meffil)
samplesheet.450k <- meffil.create.samplesheet(path=path.450k)
samplesheet.epic <- meffil.read.samplesheet(base=path.epic, pattern="Demo_SampleSheet.csv")
## [read.450k.sheet] Found the following CSV files:
## [1] "data-epic-demo/Demo_SampleSheet.csv"
samplesheet.epic2 <- meffil.read.samplesheet(base=path.epic2, pattern="SampleSheet")
## [read.450k.sheet] Found the following CSV files:
## [1] "data-epic2-demo/Demo_EPIC-8v2-0_A1_SampleSheet_16.csv"
samplesheet.450k$chip <- "450k"
samplesheet.epic$chip <- "epic"
samplesheet.epic2$chip <- "epic2"
common.cols <- intersect(colnames(samplesheet.450k),colnames(samplesheet.epic))
common.cols <- intersect(common.cols, colnames(samplesheet.epic2))
samplesheet <- rbind(
samplesheet.450k[1:10,common.cols],
samplesheet.epic[,common.cols],
samplesheet.epic2[,common.cols])
Parameters.
qc.file <- "complex-demo/qc-report.html"
author <- "Illumina, et al."
study <- "450k/epic/epic2 demo dataset"
number.pcs <- 2
norm.file <- "complex-demo/normalization-report.html"
Generate QC objects.
options(mc.core=20)
qc.objects <- meffil.qc(samplesheet, featureset="450k:epic:epic2", cell.type.reference="blood gse35069 complete", verbose=T)
QC report.
qc.summary <- meffil.qc.summary(qc.objects, verbose=T)
## [meffil.qc.summary] Thu May 11 16:25:07 2023 Sex summary TRUE
## [meffil.qc.summary] Thu May 11 16:25:07 2023 Meth vs unmeth summary
## [meffil.qc.summary] Thu May 11 16:25:07 2023 Control means summary
## [meffil.qc.summary] Thu May 11 16:25:07 2023 Sample detection summary
## [meffil.qc.summary] Thu May 11 16:25:09 2023 CpG detection summary
## [meffil.qc.summary] Thu May 11 16:25:10 2023 Sample bead numbers summary
## [meffil.qc.summary] Thu May 11 16:25:11 2023 CpG bead numbers summary
## [meffil.qc.summary] Thu May 11 16:25:11 2023 Cell count summary
## [meffil.qc.summary] Thu May 11 16:25:11 2023 Genotype concordance
meffil.qc.report(
qc.summary,
output.file=qc.file,
author=author,
study=study)
## [meffil.qc.report] Thu May 11 16:25:11 2023 Writing report as html file to complex-demo/qc-report.html
Normalization dataset.
norm.objects <- meffil.normalize.quantiles(
qc.objects,
number.pcs=number.pcs,
verbose=T)
## [meffil.normalize.quantiles] Thu May 11 16:25:21 2023 selecting dye correction reference
## [meffil.normalize.quantiles] Thu May 11 16:25:21 2023 creating control matrix
## [meffil.normalize.quantiles] Thu May 11 16:25:21 2023 normalizing quantiles
## [FUN] Thu May 11 16:25:21 2023 genomic.iG M
## [FUN] Thu May 11 16:25:21 2023 genomic.iG U
## [FUN] Thu May 11 16:25:21 2023 genomic.iR M
## [FUN] Thu May 11 16:25:21 2023 genomic.iR U
## [FUN] Thu May 11 16:25:21 2023 genomic.ii M
## [FUN] Thu May 11 16:25:21 2023 genomic.ii U
## [FUN] Thu May 11 16:25:21 2023 autosomal.iG M
## [FUN] Thu May 11 16:25:21 2023 autosomal.iG U
## [FUN] Thu May 11 16:25:21 2023 autosomal.iR M
## [FUN] Thu May 11 16:25:21 2023 autosomal.iR U
## [FUN] Thu May 11 16:25:21 2023 autosomal.ii M
## [FUN] Thu May 11 16:25:21 2023 autosomal.ii U
## [FUN] Thu May 11 16:25:21 2023 not.y.iG M
## [FUN] Thu May 11 16:25:22 2023 not.y.iG U
## [FUN] Thu May 11 16:25:22 2023 not.y.iR M
## [FUN] Thu May 11 16:25:22 2023 not.y.iR U
## [FUN] Thu May 11 16:25:22 2023 not.y.ii M
## [FUN] Thu May 11 16:25:22 2023 not.y.ii U
## [FUN] Thu May 11 16:25:22 2023 sex M
## [FUN] Thu May 11 16:25:22 2023 sex U
## [FUN] Thu May 11 16:25:22 2023 chrx M
## [FUN] Thu May 11 16:25:22 2023 chrx U
## [FUN] Thu May 11 16:25:22 2023 chry M
## [FUN] Thu May 11 16:25:22 2023 chry U
beta.meffil <- meffil.normalize.samples(
norm.objects,
just.beta=T,
cpglist.remove=qc.summary$bad.cpgs$name,
verbose=T)
Compute principal components of the normalized methylation matrix.
pcs <- meffil.methylation.pcs(
beta.meffil,
sites=meffil.get.autosomal.sites("epic"),
verbose=T)
## [meffil.methylation.pcs] Thu May 11 16:27:27 2023 Calculating CpG variance
## [meffil.methylation.pcs] Thu May 11 16:27:29 2023 Calculating beta PCs
Normalization report.
parameters <- meffil.normalization.parameters(norm.objects)
parameters$batch.threshold <- 0.01
norm.summary <- meffil.normalization.summary(
norm.objects=norm.objects,
pcs=pcs,
parameters=parameters,
verbose=T)
## [meffil.plot.control.batch] Thu May 11 16:27:29 2023 Extracting batch variables
## [meffil.plot.control.batch] Thu May 11 16:27:29 2023 Testing associations
## [meffil.plot.probe.batch] Thu May 11 16:27:33 2023 Extracting batch variables
## [meffil.plot.probe.batch] Thu May 11 16:27:33 2023 Testing associations
meffil.normalization.report(
norm.summary,
output.file=norm.file,
author=author,
study=study)
## [meffil.normalization.report] Thu May 11 16:27:36 2023 Writing report as html file to complex-demo/normalization-report.html
It looks like the normalized methylation retains has a strong association with chip.
chip <- samplesheet$chip
stats <- t(apply(pcs,2,function(pc) {
fit <- coef(summary(lm(pc ~ chip)))
fit[which.min(fit[-1,"Pr(>|t|)"])+1,]
}))
stats[stats[,"Pr(>|t|)"] < 0.05,]
## Estimate Std. Error t value Pr(>|t|)
## PC1 90.42404 15.10665 5.985712 2.554382e-06
## PC2 31.68942 12.30709 2.574892 1.606936e-02
## PC3 58.88792 13.92749 4.228180 2.572938e-04
## PC5 27.00016 3.95589 6.825306 3.033529e-07
This isn't surprising given that the data for each chip comes from a different study. If there was reason to believe that the the chip associations were entirely technical, then we could remove some of this variation by including 'chip' as a random effect in the functional normalization.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
Embedding an R snippet on your website
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.