Question: Subset data within DeSeq results object
gravatar for aorvedahl
5 months ago by
aorvedahl0 wrote:

I would like to subset data within a DeSeqResults object but no luck after much searching and experimenting. I've added a column for "Gene_ID", and I also have a separate dataframe that contains a list of gene names in Set_A. I'm able to generate another column, let's call it "Gene_Set", with a qualifier for each gene (with values "Set_A", "Set_B", etc...) using grep function based on the gene names. I'd like to plot only Set_A in an MA plot, and show the significant genes as usual (and want the statistics in DeSeqResults to reflect all sets). I've tried things like:

res.sub <- res[ , res$Gene_ID %in% Set_A ]


This is based on this post which is the closest thing I could find to what I'm trying to do, but unable to cannibalize it for my purposes. 

DESeq2: multiple conditions design -- How to select subset comparisons from the DESeq object for PCA, ...


I also tried a slightly less elegant solution by filtering the DeSeqResults object with a 'merge' function between my subset and the results object, which generates a dataframe, but plotMA(my dataframe) gives me this result:

Error in .local(object, ...) : 
  When called with a data.frame, plotMA expects the data frame to have 3 columns, two numeric ones for mean and log fold change, and a logical one for significance.)


Lastly, I tried to just color code each set with something like this, but still not working:

plotMA(res, ylim=c(-5,5), col = ifelse(res$Gene_set = "Set_A", "red", "blue"))

Error in .local(object, ...) : 
  argument 4 matches multiple formal arguments


Appreciate any and all help!


ADD COMMENTlink modified 5 months ago by Michael Love15k • written 5 months ago by aorvedahl0
gravatar for Michael Love
5 months ago by
Michael Love15k
United States
Michael Love15k wrote:

Here's a reference for subsetting data in R.

Generally, it's easy to get help if you provide both the code that you tried, and the errors that resulted.

With this command:

res$Gene_ID %in% Set_A

The problem is likely that Set_A is not defined in the environment. As you have described it, "Set_A" is a level in a data.frame. So you would have to use something like this (note you need to change the variables so they match what you are using, here I have df for data.frame):

res$Gene_ID %in% df$Gene_ID[df$Set == "Set_A"]
ADD COMMENTlink written 5 months ago by Michael Love15k
Please log in to add an answer.


Use of this site constitutes acceptance of our User Agreement and Privacy Policy.
Powered by Biostar version 2.2.0
Traffic: 169 users visited in the last hour