R: Data from the microarray experiment of human, bonobo and...
fibroEset
R Documentation
Data from the microarray experiment of human, bonobo and gorilla cultured fibroblasts done by Karaman et al. (2003)
Description
Total RNA from early-passage primary fibroblast cell lines from 18 human, 10 bonobo and 11 gorilla donors was extracted and gene-expression analysis performed using Affymetrix U95Av2.
Usage
data(fibroEset)
Format
Expression set with 12625 genes and 46 samples.
There are 2 covariates listed.
samp: sample code.
species: The species the sample was obtained from.
h: human (Homo sapiens), b: bonobo (Pan paniscus), g: gorilla (Gorilla gorilla)
Details
Data preprocessing (as described in the publication):
The raw expression scores for every gene in every sample were generated using AFFYMETRIX GENECHIP 5.0. Normalization was done by calculating multiplicative scaling factors on the basis of the median intensity of the 60th to 95th percentile of gene-expression scores. All gene-expression scores below 100 were set to 100 to minimize noise associated with less robust measurements of rare transcripts.
The usage of a human chip can cause mismatches between the ape RNA samples and human oligonucleotide probes. Because 16 perfect match probes interrogate each gene, the effect of mismatches should be minimal (Hacia et al. 1998).
Karaman M.W., Houck M.L., Chemnick L.G., Nagpal S., Chawannakul D., Sudano D., Pike B.L., Ho V.V., Ryder O.A. & Hacia J.G. (2003) Comparative Analysis of Gene-Expression Patterns in Human and African Great Ape Cultured Fibroblasts. Genome Research13, 1619-1630.
Hacia J.G. et al. (1998) Evolutionary sequence comparisons using high-density oligonucleotide arrays. Nature genetics18, 155-158.
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> library(fibroEset)
Loading required package: Biobase
Loading required package: BiocGenerics
Loading required package: parallel
Attaching package: 'BiocGenerics'
The following objects are masked from 'package:parallel':
clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
clusterExport, clusterMap, parApply, parCapply, parLapply,
parLapplyLB, parRapply, parSapply, parSapplyLB
The following objects are masked from 'package:stats':
IQR, mad, xtabs
The following objects are masked from 'package:base':
Filter, Find, Map, Position, Reduce, anyDuplicated, append,
as.data.frame, cbind, colnames, do.call, duplicated, eval, evalq,
get, grep, grepl, intersect, is.unsorted, lapply, lengths, mapply,
match, mget, order, paste, pmax, pmax.int, pmin, pmin.int, rank,
rbind, rownames, sapply, setdiff, sort, table, tapply, union,
unique, unsplit
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Vignettes contain introductory material; view with
'browseVignettes()'. To cite Bioconductor, see
'citation("Biobase")', and for packages 'citation("pkgname")'.
> png(filename="/home/ddbj/snapshot/RGM3/R_BC/result/fibroEset/fibroEset.Rd_%03d_medium.png", width=480, height=480)
> ### Name: fibroEset
> ### Title: Data from the microarray experiment of human, bonobo and gorilla
> ### cultured fibroblasts done by Karaman et al. (2003)
> ### Aliases: fibroEset
> ### Keywords: datasets
>
> ### ** Examples
>
> library(Biobase)
> data(fibroEset)
> xx <- exprs(fibroEset)
> colnames(xx) <- as.character(fibroEset$species)
> dim(xx)
[1] 12625 46
> xx[1:5,1:5]
b b b b b
100_g_at 476 518 686 602 470
1000_at 1795 890 508 1113 708
1001_at 100 119 100 100 100
1002_f_at 100 101 100 100 100
1003_s_at 100 100 100 100 100
> fibroEset$species
[1] b b b b b b b b b b b g g g g g g g g g g g g h h h h h h h h h h h h h h h
[39] h h h h h h h h
Levels: b g h
> featureNames(fibroEset)[1:20]
[1] "100_g_at" "1000_at" "1001_at" "1002_f_at" "1003_s_at" "1004_at"
[7] "1005_at" "1006_at" "1007_s_at" "1008_f_at" "1009_at" "101_at"
[13] "1010_at" "1011_s_at" "1012_at" "1013_at" "1014_at" "1015_s_at"
[19] "1016_s_at" "1017_at"
>
>
>
>
>
> dev.off()
null device
1
>