MAPINFO from probe.feature in CHAMP package different from CpG position in UCSC

Question

[caocloud.bt]

Hi everyone,

I just went through my coding to map the CpG ( to their location on the genome using:

library(ChAMP) data(probe.features) probe.features["cg04946709",] # CHR MAPINFO #cg04946709 16 59789030

The result showed that this cpg is at 59789030 on chromosome 16.

When I do a search on UCSC, the MAPINFO is different by 1 with Item: cg04946709 Score: 527 Position: chr16:59789031-59789031

May I ask if anyone you here know why, please?

Thanks all.