A number sign (#) is used with this entry because Dyggve-Melchior-Clausen disease (DMC) is caused by homozygous or compound heterozygous mutation in. Dyggve-Melchior-Clausen disease (DMC) is a rare skeletal disorder Differential diagnoses include Smith-McCort syndrome (SMC; see this term), which. Dyggve-Melchior-Clausen (DMC) syndrome is a rare autosomal recessive disorder characterized by the association of spondylo-epi-metaphyseal dysplasia and.

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The Johns Hopkins University. Skeletal abnormalities in this condition may include a barrel-shaped chest with a short truck, partial dislocation of the hips, genu valgum knocked knees or varum bowed legsand decreased joint mobility.

MRI findings in DMC include hypoplasia of the odontoid process, posterior disk protrusions in the lumbar vertebrae and the enlargement of the posterior common vertebral ligament Paupe et al. Case report and review of the literature. In adult patients, the vertebral bodies become more rectangular as the appositional bone which appears during adolescence becomes fused. Four tested children each had the same missense mutation in the RAB33B gene. The cause of the disorder also is produced from mutations in the TRPV4 gene.

The cause of the disorder is a mutation in the TRPV4 gene. Alternatively, gene testing for mutations in DYM can be done.

The Dyggve-Melchior-Clausen syndrome in adult siblings. Chondrodysplasia resulting from defects in intracellular vesicle traffic.


The patient shown in family 12 plate XII of the Norwegian study by Hobaek is probably identical. Children with DMC syndrome may benefit from early intervention and special educational programs. The disease often progresses towards orthopedic complications which can include lumbar lordosis, thoracic kyphosis, hip luxation, deformation of the knees and spinal cord compression secondary to instability of the atlas-axis.

Radiographically, there is severe and generalized platyspondyly, widened and irregular metaphyses of the tubular bones, coxa vara, and delayed bone maturation. Differential diagnoses include Smith-McCort syndrome SMC; see this termwhich presents with the same clinical and radiological features as DMC but without intellectual deficiency, and Morquio disease or mucopolysaccharidosis type 4, MPS IV; see this termwhich is clinically similar but has specific radiological and enzymatic signs.


We are determined to keep this website freely accessible. When there is hypoplasia of the odontoid process and partial dislocation of the cervical vertebrae the segments of the spinal column at the top of the spinespinal fusion of these vertebrae or other means of vertebral stabilization normally is indicated.

Naffah and Taleb described spinal compression from odontoid hypoplasia, as in the Morquio syndrome. The gene now most commonly is referred to as DYM. Normally, there is growth deficiency resulting in short stature.

Orphanet: Dyggve Melchior Clausen disease

Last Edited October 1, Am J Hum Genet. Independently, using a positional cloning strategy, El Ghouzzi et al. Morphological and biochemical findings in cartilage dyggve-melchior-clausej zone.

Occurrence of three siblings. Heterogeneity of Dyggve-Melchior-Clausen dwarfism. Comparisons may be useful for a differential diagnosis: Throughout childhood and as adults, thoracic kyphosis, scoliosis, lumbar lordosis, syjdrome partial dyggve-melchior-clasen and frank dislocation of the hips, wide-based and waddling gait, genu valgum or varum, and restricted joint mobility appear and may worsen.

Spondyloepiphyseal dysplasia tarda, an X-linked inherited disorder, is also a rare genetic disorder that primarily affects males and is characterized by short stature, kyphoscoliosis, and lumbar lordosis. Additional information Further information on this disease Classification s 3 Gene s 1 Clinical signs and symptoms Publications in PubMed Other website s 3.

The gene encodes for a Rab protein and the mutation lead to a marked deficiency of this protein.

A deficiency of either enzyme leads to the accumulation of mucopolysaccharides in cells, cloudy corneas, deafness, abnormal skeletal development, and other features. Dyggve-Melchior-Clausen syndrome DMC is a rare, progressive genetic disorder characterized by abnormal skeletal development, microcephaly and intellectual disability.

In some individuals, hip replacement is required. J Magnet Reson Imag. The growth plate showed abnormal enchondral ossification with no columnarization of chondrocytes.

The Dyggve-Melchior-Clausen syndrome in Indian siblings. Analysis of 3 small, unrelated families with DMC syndrome provided evidence of linkage to the same region, a result consistent with the hypothesis that the 2 disorders are allelic.

Spondylometaphyseal dysplasia, Kozlowski type, is a rare disorder characterized by short stature with a short neck and trunk, scoliosis or kyphoscoliosis, short hands and feet and limited joint movement associated with an abnormal gait. Changes in the composition of this collagen lead to abnormal skeletal growth in this and related disorders. The vertebral body constriction abnormalities and lacy pattern of stndrome iliac crests appear by years and may persist until adulthood.


When it occurs, spinal cord compression in the neck is usually caused by the dyggve-melchior-clauen of the odontoid process and to hyperlaxity of the longitudinal ligament of the upper cervical spine.

Rare Disease Database

The large majority of mutations identified in the gene predict a loss of function of its product. Six years experience of tertiary center. Both are classified as osteochondrodysplasias, specifically a spondyloepimetaphyseal dysplasia; this latter category of dysplasias consists of 28 separate disorders Lachmanpp. Dyggve-Melchior-Clausen syndrome is inherited as an autosomal dyggve-melchlor-clausen trait. The clinical features of Morquio syndrome type B are usually fewer and milder than those associated with Morquio syndrome type A.

Disease definition Dyggve-Melchior-Clausen disease DMC is a rare skeletal disorder belonging to the dyggge-melchior-clausen of spondyloepimetaphyseal dysplasias see this term.

All studies receiving U.

Differential diagnosis Differential diagnoses include Smith-McCort syndrome SMC; see this termwhich presents with the same clinical and radiological features as DMC but without intellectual deficiency, and Morquio disease or mucopolysaccharidosis type 4, MPS IV; see this termwhich is clinically similar but has specific radiological and enzymatic signs. Rhizomelic shortening of the limbs disproportionate shortening of the proximal portion of the limbs may be present also.

Together we are strong. Mutational analysis of DYM currently is available http: In addition to the skeletal abnormalities listed above, affected individuals can also develop a short neck and chest, pectus carinatum protruding breastbone dyggve-mflchior-clausen, flaring of the costal margins, kyphosis dyggve-melchior-clauseh backward curvature of the spinelumbar lordosis abnormal forward curvature of the spinescoliosis side-to-side curvature of the spineclaw-like hands, other joint contractures especially of the elbows and hips, genu valgum and talipes equinovarus clubbed feet Aglan et al.

In someindividuals, ulnar deviation of the wrists abnormal bending of the hand toward the fifth finger side of the handand limited flexibility the elbows and hips may occur.