NCIt definition : Human HCFC1 wild-type allele is located in the vicinity of Xq28 and is approximately
25 kb in length. This allele, which encodes host cell factor 1 protein, plays a role
in histone modification, transcriptional regulation, and herpes simplex virus gene
transcription. Mutation of the gene is associated with cblX type methylmalonic aciduria
and homocysteineima and X-linked mental redardation 3.;