Abstract. X-linked dominant chondrodysplasia punctata, (CDPX2 – MIM ) also known as Conradi-. Hünermann-Happle syndrome, is a rare form of. X-linked chondrodysplasia punctata 2 is a disorder characterized by bone, skin, and eye abnormalities. It occurs almost exclusively in females. Although the. Minerva Pediatr. Mar;45(3) [Chondrodysplasia punctata (the Conradi-Hünermann syndrome). A clinical case report and review of the literature ].

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Chondrodysplasia punctata, X-linked dominant. Scientists are still trying to understand exactly where the mutation occurs so that they can correct it.

They found abnormal plasma or tissue sterol profiles characterized by increased levels of 8-dehydrocholesterol and 8 9 -cholestenol, suggesting a deficiency of 3-beta-hydroxysteroid-delta 8 ,delta 7 -isomerase, a principal enzyme of cholesterol biosynthesis. Comment on Traupe’s tribute to Rudolf Happle. Affected Males Sutphen et al.

Hunter syndrome Purine—pyrimidine metabolism: The X-linked dominant form of chondrodysplasia punctata is lethal in the hemizygous male and, in females, shows a pattern of skin defects consistent with functional X-chromosomal mosaicism; the variability in severity and the marked asymmetry of bone and eye changes may have a similar explanation.

Affected females had typical skin manifestations and all but 1 had skeletal dysplasia.

Two-point linkage analysis and analysis of recombination chromosomes seemed to exclude the gene from the entire X chromosome.


Sterol levels are measured by gas chromatography-mass spectrometry. About News Syndromd Contact.

The specific symptoms and severity of the disorder may vary greatly from one individual to another. According to researchers, in males who inherit a disease gene for an X-linked dominant disorder hemizygotes syndromme, it is suspected that full expression of the disorder may be associated with loss of life before birth. The EBP gene creates a protein known as emopamil-binding protein.

Disorders of cholesterol biosynthesis: Views Read Edit View history. The phenotype of Td is similar to that seen in heterozygous females with human X-linked dominant chondrodysplasia punctata as well as another X-linked semidominant mouse mutation, ‘bare patches’ Bpa. The X-linked recessive form is clinically mild but has cerebral involvement.

Conradi–Hünermann syndrome – Wikipedia

Multiple recombinations appeared to exclude the Xq28 region as the site of the gene. Cartilage is a tough, elastic type of connective tissue that provides cushion and structure within the body. Various orthopedic measures, including surgery, may be recommended to help prevent, treat, or correct certain skeletal abnormalities associated with the disorder.

It is associated with the EBP gene [3] [4] and affects between one inand one inbabies. Decreased peroxisomal enzyme activity was demonstrated on fibroblast cultures. These disorders include Zellweger spectrum disorders, Smith-Lemli-Optiz syndrome, fetal alcohol syndrome, trisomies 18 and 12, Greenberg dysplasia, and chondrodysplasia punctata, tibia-metacarpal type.

Investigators have determined that the EBP gene is located on the short arm p of the X chromosome Xp The disorder is caused by deletions or chromosomal rearrangements translocations involving the end of the short arm p of chromosome X Xp One expects with an X-linked dominant male-lethal gene to find a ratio of 1: Osteochondroma osteochondromatosis Hereditary multiple exostoses. Expert curators review the literature and organize it to facilitate your work.


Within families, there is variation in the severity of the clinical picture between affected females, and this is largely secondary to differences in X-inactivation. This result suggested that the assumption that males with a mutant gene for Happle syndrome die in utero could be wrong.

Rare Disease Database

Years Published, Abnormal stiffness of the joints or joints that are fixed or locked in a bent position flexion contractures may also occur. National Center for Biotechnology Information.

Two of their mothers showed a mild form of cicatricial alopecia. The mother was born with short femora and humeri, the left leg shorter than the right, saddle nose, frontal bossing, flexion contractures at the hips and knees, left talipes equinovarus and hyperkeratosis with erythema of the left side of the body.