Journal Article

Mutations in a novel gene <i>Dymeclin</i> (FLJ20071) are responsible for Dyggve–Melchior–Clausen syndrome

Vincent El Ghouzzi, Nathalie Dagoneau, Esther Kinning, Christel Thauvin-Robinet, Wassim Chemaitilly, Catherine Prost-Squarcioni, Lihadh I. Al-Gazali, Alain Verloes, Martine Le Merrer, Arnold Munnich, Richard C. Trembath and Valérie Cormier-Daire

in Human Molecular Genetics

Volume 12, issue 3, pages 357-364
Published in print February 2003 | ISSN: 0964-6906
Published online February 2003 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddg029
Mutations in a novel gene Dymeclin (FLJ20071) are responsible for Dyggve–Melchior–Clausen syndrome

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Dyggve–Melchior–Clausen syndrome (DMC) is a rare autosomal-recessive disorder, the gene for which maps to chromosome 18q21.1. DMC is characterized by the association of a spondylo-epi-metaphyseal dysplasia and mental retardation. Electron microscopic study of cutaneous cells of an affected child showed dilated rough endoplasmic reticulum, enlarged and aberrant vacuoles and numerous vesicles. As the etiology of the disorder is unknown, we have used a positional cloning strategy to identify the DMC gene. We detected seven deleterious mutations within a gene predicted from a human transcript (FLJ20071) in 10 DMC families. The mutations were nonsense mutations (R194X, R204X, L219X, Q483X), splice site or frameshift mutations (K626N+92aa to stop). The DMC gene transcript is widely distributed but appears abundant in chondrocytes and fetal brain. The predicted protein product of the DMC gene yields little insight into its likely function, showing no significant homology to any known protein family. However, the carboxy terminal end comprises a cluster of dileucine motifs, highly conserved across species. We conclude that DMC syndrome is consequent upon loss of function of a gene that we propose to name Dymeclin, which may have a role in process of intracellular digestion of proteins.

Journal Article.  4165 words.  Illustrated.

Subjects: Genetics and Genomics

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