gnu: Add r-geneoverlap.

* gnu/packages/bioconductor.scm (r-geneoverlap): New variable.

gnu/packages/bioconductor.scm

@@ -1127,6 +1127,26 @@ (define-public r-genelendatabase
 genomes and gene ID formats, largely based on the UCSC table browser.")
     (license license:lgpl2.0+)))
 
+(define-public r-geneoverlap
+  (package
+    (name "r-geneoverlap")
+    (version "1.26.0")
+    (source (origin
+              (method url-fetch)
+              (uri (bioconductor-uri "GeneOverlap" version))
+              (sha256
+               (base32
+                "0bvh00n4fx0h1m83bypib3jvln1ihcv77ywrrn9xm20y73gymhkh"))))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-rcolorbrewer" ,r-rcolorbrewer)
+       ("r-gplots" ,r-gplots)))
+    (home-page "https://www.bioconductor.org/packages/GeneOverlap/")
+    (synopsis "Test and visualize gene overlaps")
+    (description "This package can be used to test two sets of gene lists
+and visualize the results.")
+    (license license:gpl3)))
+
 (define-public r-pasilla
   (package
     (name "r-pasilla")