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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Orphanet: Dyggve Melchior Clausen disease

The data corroborated the impression that these 2 disorders are allelic and identified a ysndrome necessary for normal skeletal development and brain function. The treatment of genu varum in this condition has been reported Kenis et al. Dictionary of Medical Syndromes. Analysis of a second, smaller family was also consistent with linkage to this region, producing a maximum combined 2-point lod score of 3.

Rare Disease Database

A diagnosis of DMC syndrome may be suspected upon a thorough clinical evaluation, a detailed patient history, and identification of characteristic clinical findings, e. Alone we are rare. Dyggve-melchiof-clausen content of the website and databases of the National Organization for Rare Disorders NORD is copyrighted and may not be reproduced, copied, downloaded or disseminated, in any way, for any commercial or public purpose, without prior written authorization and approval from NORD.

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.

The patients were mentally retarded, and the urine showed mucopolysaccharide. A deficiency of either enzyme leads to the accumulation of mucopolysaccharides in cells, cloudy corneas, deafness, abnormal skeletal development, and other features.

Morphological findings in the growth plate dyggge-melchior-clausen the iliac crest. Secondary problems resulting from the skeletal abnormalities associated with DMC dyggve-melchior-claisen include spinal compression, dislocated hips and restricted joint mobility.


Chondrodysplasia resulting from defects in intracellular vesicle traffic. The Dyggve-Melchior-Clausen syndrome in adult siblings. On electron microscopic exam, the chondrocytes contain widened cisternae of the rough endoplasmic reticulum, and the vesicles are coated with a smooth single-layered membrane Engfeldt et al.

In a review of DMC disease, Beighton gave information on the 3 authors whose names are attached to the disorder. CCCCC ]. Spondyloepiphyseal dysplasia congenital is inherited as an autosomal dominant trait and is produced by a mutation in the collagen II Syndromme gene.

Thinning of the corpus callosum has also been reported Dupuis et al. Alternatively, gene dyggvve-melchior-clausen for mutations in DYM can be done. The cleft palate is present at birth but other characteristics may not appear for 2 or 3 years. Most affected individuals also have hypotonia diminished muscle tonekyphoscoliosis, lumbar lordosis, and pectus carinatum.

Most individuals with Morquio syndrome have normal intelligence.


The spine showed generalized platyspondyly. Independently, using a positional cloning strategy, El Ghouzzi et al. Summary Epidemiology To date around cases have been recorded.

In addition to the skeletal abnormalities listed above, affected individuals can also develop a short neck and chest, pectus carinatum protruding breastboneflaring of the costal margins, kyphosis excessive 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.

Findings in both types may also include growth retardation, mildly course facial appearance, glaucoma, a prominent lower face, an abnormally short neck, pectus carinatum, kyphoscoliosis, platyspondyly, irregular epiphyses ends of the long bonesbroad metaphyses segments underneath the epiphysesgenu valgum, and flat feet.


Diagnosis is based on radiological evidence revealing platyspondyly with double vertebral humps, epiphyseal and metaphyseal dysplasia and scalloped iliac crests. For instance, chest deformities, feeding difficulties and developmental delay usually are manifest by or before 18 months. Kniest dysplasia features include cleft palate, short stature and enlarged joints. Metatropic dysplasia I is also a rare genetic disorder with major findings including extremely short stature with short arms and legs.

Four tested children each had the same missense mutation in the RAB33B gene. Europ J Med Gen. Additionally, surgical techniques may be used to correct various other skeletal abnormalities such as subluxation or dislocation of the shoulder and hip joints. The condition is inherited in an autosomal dominant mode. Indian J Psych Med; ; Clinically, DMC is characterized by progressive dwarfism with short trunk, protruding sternum, microcephaly and mental retardation of varying severity. 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.

Investigational Therapies Information on current clinical trials is posted on the Internet at www. Both are classified as osteochondrodysplasias, specifically a spondyloepimetaphyseal dysplasia; this latter category of dysplasias consists of 28 separate disorders Lachmanpp. The vertebral body constrictions are most prominent between ages 8 and 12 years Aglan et al.

Alternatively, there may be little or no production from one gene and production of a partially functioning protein from the other. Subluxation of the hips is frequent. Last Edited May 3, Case report and review of the literature.