Evolutionary Origin and Methylation Status of Human Intronic CpG Islands that Are Not Present in Mouse
Rademacher, K., Schröder, C., Kanber, D., Klein-Hitpass, L., Wallner, S., Zeschnigk, M., Horsthemke, B.
Genome Biol Evol 6, 1579–1588 (2014), doi:10.1093/gbe/evu125
Imprinting of the human RB1 gene is due to the presence of a differentially methylated CpG island (CGI) in intron 2, which is part of a retrocopy derived from the PPP1R26 gene on chromosome 9. The murine Rb1 gene does not have this retrocopy and is not imprinted. We have investigated whether the RB1/Rb1 locus is unique with respect to these differences.