Dyggve Melchior Clausen Syndrome
National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Dyggve Melchior Clausen Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
Dyggve-Melchior-Clausen (DMC) syndrome is a rare, progressive genetic disorder characterized by abnormal skeletal development, microcephaly and mental retardation. Skeletal abnormalities may include a barrel-shaped chest with a short truck, partial dislocation of the hips, genu valgum (knocked knees) or varum (bowed legs), and decreased joint mobility. In 11% of patients, there is atlantoaxial (upper neck vertebrae) instability that can lead to spinal cord compression, weakness and paralysis. Normally, there is growth deficiency resulting in short stature. Radiographic findings in older children and adults are pathognomonic for the disorder. The condition, DMC results from mutations in the DYM (dymeclin) gene and is inherited in an autosomal recessive mode. A variant of DMC syndrome, Smith-McCort syndrome (SMS), has identical skeletal abnormalities, but lacks the mental deficiency. SMS is also caused by mutations in DYM, and thus is allelic to DMC. Both are classified as osteochondrodysplasias, specifically a spondyloepimetaphyseal dysplasia; this latter category consists of 27 separate disorders.
Human Growth Foundation
997 Glen Cove Avenue
Glen Head, NY 11545
6645 W. North Avenue
Oak Park, IL 60302
March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
Arc (a national organization on mental retardation)
1010 Wayne Ave
Silver Spring, MD 20910
Little People of America, Inc.
250 El Camino Real
Tustin, CA 92780
NIH/National Institute of Child Health & Human Development (Preg & Perinat)
Pregnancy and Perinatology Branch
6100 Executive Blvd Rm 4B03
Bethesda, MD 20892-7510
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
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