Human Molecular Genetics, Vol 8, 783-793, Copyright © 1999 by Oxford University Press
MT Jong, TA Gray, Y Ji, CC Glenn, S Saitoh, DJ Driscoll and RD Nicholls
We describe a complex imprinted locus in chromosome 15q11-q13 that encodes
two genes, ZNF127 and ZNF127AS. The ZNF127 gene encodes a protein with a
RING (C3HC4) zinc-finger and multiple C3H zinc-finger motifs, the former
being closely related to a protein from variola major virus, the smallpox
etiological agent. These motifs allow prediction of ZNF127 function as a
ribonucleoprotein. The intronless ZNF127 gene is expressed ubiquitously,
but the entire coding sequence and 5' CpG island overlaps a second gene,
ZNF127AS, that is transcribed from the antisense strand with a different
transcript size and pattern of expression. Allele-specific analysis shows
that ZNF127 is expressed only from the paternal allele. Consistent with
this expression pattern, in the brain the ZNF127 5' CpG island is
completely unmethylated on the paternal allele but methylated on the
maternal allele. Analyses of adult testis, sperm and fetal oocytes
demonstrates a gametic methylation imprint with unmethylated paternal germ
cells. Recent findings indicate that ZNF127 is part of the coordinately
regulated imprinted domain affected in Prader-Willi syndrome patients with
imprinting mutations. Therefore, ZNF127 and ZNF127AS are novel imprinted
genes that may be associated with some of the clinical features of the
polygenic Prader-Willi syndrome.
ARTICLES
A novel imprinted gene, encoding a RING zinc-finger protein, and overlapping antisense transcript in the Prader-Willi syndrome critical region
Department of Genetics and Center for Human Genetics, Case Western Reserve University School of Medicine, University Hospitals of Cleveland, 10900 Euclid Avenue, Cleveland, OH 44106-4955, USA.
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