Hi, I'm trying to use the clusterProfiler package to explore which pathways are overrepresented in my list of significantly differentiated genes. I have 173 DE genes, however when I run them through enrichGO it produces an output that has no pathways in it. I've ran the same parameters on other DE genes from other comparisons (one with only 43 DE genes) and they both produced outputs with pathways, so I don't understand why a list of 173 genes doesn't produce anything. My enrichGO code is below:
ego3 <- enrichGO(gene = sig_genes3, universe = gene_list3, keyType = "ENSEMBL", OrgDb = org.Mm.eg.db, ont = "BP", pAdjustMethod = "BH", readable = TRUE)
 ID Description GeneRatio BgRatio pvalue p.adjust qvalue geneID Count
<0 rows> (or 0-length row.names)
Any help would be much appreciated.