A Maternal Hypomethylation Syndrome Presenting As Transient Neonatal Diabetes Mellitus

Overview

Journal Hum Genet

Specialty Genetics

Date 2006 Jul 4

PMID 16816970

Citations 37

Authors

D J G Mackay

S E Boonen

J Clayton-Smith

J Goodship

J M D Hahnemann

S G Kant

P R Njolstad

N H Robin

D O Robinson

R Siebert

J P H Shield

H E White

I K Temple

Affiliations

Soon will be listed here.

Abstract

The expression of imprinted genes is mediated by allele-specific epigenetic modification of genomic DNA and chromatin, including parent of origin-specific DNA methylation. Dysregulation of these genes causes a range of disorders affecting pre- and post-natal growth and neurological function. We investigated a cohort of 12 patients with transient neonatal diabetes whose disease was caused by loss of maternal methylation at the TNDM locus. We found that six of these patients showed a spectrum of methylation loss, mosaic with respect to the extent of the methylation loss, the tissues affected and the genetic loci involved. Five maternally methylated loci were affected, while one maternally methylated and two paternally methylated loci were spared. These patients had higher birth weight and were more phenotypically diverse than other TNDM patients with different aetiologies, presumably reflecting the influence of dysregulation of multiple imprinted genes. We propose the existence of a maternal hypomethylation syndrome, and therefore suggest that any patient with methylation loss at one maternally-methylated locus may also manifest methylation loss at other loci, potentially complicating or even confounding the clinical presentation.

Citing Articles

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