Microarray differential expression analysis with R involving >200 samples
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atakanekiz ▴ 30
@atakanekiz-15874
Last seen 7 hours ago
Turkey

Dear BC community,

As you might already know immgen is a public database that hosts microarray data from various immune cell populations. There are more than 200 cell types in there (with raw data coming from 2-3 biological replicates that are accessible in this and this links).

I'd like crunch all these data together to come up with a list of significantly and differentially expressed genes that discriminate the cell types from one another. I'm planning to use this information in a separate pipeline I'm working on. I started following the vignettes of packages like limma, but I wanted to get your opinions whether there is a preferred method of approaching a multidimensional dataset like this. It is a bit different than straightforward 2 or 3 group comparisons. Would limma work in my case? An important factor to consider here may be the numbers of biological replicates per cell type (some samples have 2 and most others have 3). If you have suggestions for approaching this kind of data, please let me know.

Best,

Atakan

 

immgen • 536 views
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@gordon-smyth
Last seen 37 minutes ago
WEHI, Melbourne, Australia

We certainly use limma to analyse ImmGen data. limma can handle thousands of samples quite quickly and there's no limit on the number of distinct cell types. Having 2-3 replicates per cell type is fine.

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