Inter-conversion between EntrezGene ID and Symbols
Code
library (org.Hs.eg.db)
Ann_eg2sy.chv <- unlist (as.list (org.Hs.egSYMBOL))
Ann_sy2eg.chv <- names (Ann_eg2sy.chv)
names (Ann_sy2eg.chv) <- Ann_eg2sy.chv
# EXAMPLES
# From EntrezGene-ID to Symbol
Ann_eg2sy.chv["100033460"]
# From Symbol to EntrezGene-ID
Ann_sy2eg.chv["SNORD115-20"]
Note:
use org.Xx.eg.db where Xx is your species identifier for any other species (e.g. Mm for mouse)