Question: rowRanges in Summarized Experiment changes counts
gravatar for krc3004
2.5 years ago by
krc300410 wrote:

Hi all,

First post here, so apologies if I haven't explained anything clearly/followed standard guidelines.

I'd like to create a summarized experiment object for downstream analysis of my count data from RNA seq analysis.  The way I do this is something like this: <- SummarizedExperiment(list(rna_raw_counts_no_tech_rep_ordered), rowRanges = exons.genes)

Where rna_raw_counts_no_tech_rep_ordered is my table of raw counts across all samples.  exons.genes is a GRanges list which looks like this (one example gene; this contains ranges for the whole genome of interest):

GRanges object with 5 ranges and 0 metadata columns:
      seqnames                 ranges strand
  [1]     chr7 [102235854, 102235872]      +
  [2]     chr7 [102236094, 102236346]      +
  [3]     chr7 [102236448, 102236542]      +
  [4]     chr7 [102237122, 102237230]      +
  [5]     chr7 [102237401, 102237530]      +


However, I notice that when I add the rowRanges argument to the SummarizedExperiment function as shown above, my counts across all samples change!  When it isn't included, the counts stay the same as what's in the raw count table.  I can access the counts like this:[[1]]["00R_Pgap2 ",]

Has anyone come across an error like this?  Thanks very much for your help!

ADD COMMENTlink modified 2.5 years ago by Martin Morgan ♦♦ 23k • written 2.5 years ago by krc300410

Can you provide a reproducible example? For instance, I hae

> library(SummarizedExperiment)
> m <- matrix(1:4, 2, dimnames=list(letters[1:2], NULL))
> rowRanges <- GRanges("chr1", IRanges(1:2, 3, names=letters[1:2]))
> assay(SummarizedExperiment(list(m), rowRanges=rowRanges))
  [,1] [,2]
a    1    3
b    2    4

Also, it's important to make sure we're using current software, so I have

> sessionInfo()
R version 3.4.0 Patched (2017-05-04 r72654)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.1 LTS

Matrix products: default
BLAS: /home/mtmorgan/bin/R-3-4-branch/lib/
LAPACK: /home/mtmorgan/bin/R-3-4-branch/lib/

 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            

attached base packages:
[1] parallel  stats4    stats     graphics  grDevices utils     datasets 
[8] methods   base     

other attached packages:
[1] SummarizedExperiment_1.6.1 DelayedArray_0.2.0        
[3] matrixStats_0.52.2         Biobase_2.36.1            
[5] GenomicRanges_1.28.1       GenomeInfoDb_1.12.0       
[7] IRanges_2.10.0             S4Vectors_0.14.0          
[9] BiocGenerics_0.22.0       

loaded via a namespace (and not attached):
 [1] lattice_0.20-35         bitops_1.0-6            grid_3.4.0             
 [4] zlibbioc_1.22.0         XVector_0.16.0          Matrix_1.2-10          
 [7] tools_3.4.0             RCurl_1.95-4.8          compiler_3.4.0         
[10] GenomeInfoDbData_0.99.0
ADD REPLYlink written 2.5 years ago by Martin Morgan ♦♦ 23k
Answer: C: rowRanges in Summarized Experiment changes counts
gravatar for krc3004
2.5 years ago by
krc300410 wrote:

Never mind!  Silly mistake on my part- the names in exons.genes weren't in the same order as the row names in rna_raw_counts_no_tech_rep_ordered, so things got jumbled, not changed.  Fixed the order and everything looks good. 

ADD COMMENTlink written 2.5 years ago by krc300410
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