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Dyggve–Melchior–Clausen syndrome and Smith–McCort dysplasia: Clinical and molecular findings in three families supporting genetic heterogeneity in Smith–McCort dysplasia
Author(s) -
Neumann Luitgard M.,
Ghouzzi Vincent El,
Paupe Vincent,
Weber HansPeter,
Fastnacht Elisabeth,
Leenen Andreas,
Lyding Sigrid,
Klusmann Anne,
Mayatepek Ertan,
Pelz Jörg,
CormierDaire Valerie
Publication year - 2006
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.31090
Subject(s) - missense mutation , phenotype , genetics , dysplasia , allele , genetic heterogeneity , mutation , chromosome , biology , gene
Dyggve–Melchior–Clausen syndrome (DMC) (MIM 223800) and Smith–McCort dysplasia (SMC) (MIM 607326) are rare allelic autosomal recessive spondylo‐epi‐metaphyseal dysplasias (SEMDs) characterized by similar skeletal manifestations. Both phenotypes have been mapped to chromosome 18q21.1 and mutations in the DYM ( dymeclin ) gene were identified in 13 families with DMC and in two families with SMC. Most mutations identified in DMC predict a loss of function, while those identified in SMC are mainly missense mutations, presumably associated with residual DYM activity and a less severe phenotype. We studied three consanguineous families from Turkey, Lebanon, and Georgia, one with SMC and two with DMC and identified different homozygous DYM mutations (IVS3 194‐1G > A, 938_942delTGTCT) in the DMC families. No mutation was identified in the SMC family, possibly suggesting genetic heterogeneity of this disorder. © 2006 Wiley‐Liss, Inc.