Methyl-CpG-binding domain protein 1 (MBD1)

Transcriptional repressor that binds CpG islands in promoters where the DNA is methylated at position 5 of cytosine within CpG dinucleotides. Binding is abolished by the presence of 7-mG that's made by DNA damage by methylmethanesulfonate (MMS).

Acts as transcriptional repressor and plays a role in gene silencing by recruiting AFT7IP, which subsequently recruits factors like the histone methyltransferase SETDB1. Probably forms a complex with SETDB1 and ATF7IP that represses transcription and couples DNA methylation and histone'Lys-9' trimethylation.