Simple Comparative Analyses of Differentially Expressed Gene Lists May Overestimate Gene Overlap.

Abstract excerpt

Comparing the overlap between sets of differentially expressed genes (DEGs) within or between transcriptome studies is regularly used to infer similarities between biological processes. Significant overlap between two sets of DEGs is usually determined by a simple test. The number of potentially overlapping genes is compared to the number of genes that actually occur in both lists, treating every gene as equal....

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