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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Disorders of cholesterol biosynthesis: The numbered bands specify the location of the thousands of genes that are present on each chromosome. In some cases, eye abnormalities can significantly reduce vision. No correlation between the nature of the mutation and the phenotype was evident.

A second possibility is that of metabolic interference as proposed by Johnson None of the mutations were identical to those found by Derry et al. The disorder syndrone cause serious complications at birth or be so mild that individuals may not be identified until adulthood usually after having an affected child.

Has C, Bruckner-Tuderman L, et al. Thirteen of the mutations were novel. Comment on Traupe’s tribute to Rudolf Happle. Chondrodysplasia punctata CDP is a clinically and genetically heterogeneous disorder characterized by punctiform calcification of the bones.

Florida Zoo Gives Girl with Conradi-Hünermann Syndrome an Unforgettable Day

Some affected infants are prone to developing repeated infections. On reexamination of the pedigree, they realized that in contrast to their expectation of a gene that is lethal for hemizygous males and thus results in a preponderance of females, they actually observed a close-to-even sex ratio M: In some cases, affected areas of the skin may be darker or lighter than surrounding areas hyper- hunermanm hypopigmentation.

We need long-term secure funding to provide you the information that you need at your fingertips. They considered 3 mechanisms that might explain the apparent exclusion of the X-linked gene from the X chromosome by linkage analysis. Whittock NV, Izatt L. Only after 5 months did the streaky hyperkeratotic pattern characteristic of the disorder appear.


X-linked dominant Conradi-Hunermann syndrome presenting as congenital erythroderma.

Conradi–Hünermann syndrome

Affected females had typical skin manifestations and all but 1 had synrome dysplasia. Women with a copy of the disease gene have a 50 percent risk of transmitting the gene to their daughters and their sons.

CC HPO: However, since males have only one X hundrmann, if they inherit a gene for a disease conadi on the X, it is more likely to be fully expressed.

Additional characteristic findings may include sparse, unruly hair; ichthyosis, primarily over the neck, on the chest, under the arms, and on the backs of the legs; and underdevelopment of the nose nasal hypoplasia. This explanation would account for the unexpected sex ratio Conraadi The severity of the disorder can vary greatly from one person to another. Other symptoms can be treated with medicine or surgery. A firm diagnosis would not have been possible on the basis of the radiologic findings in the mother alone.

Chondrodystrophia calcificans congenita Conradi’s disease in a mother and her child. Heterozygous females are small and at 4 to 5 days of age develop patches of hyperkeratotic skin where no hair grows, resulting in a striping of the coat in adults Uwechue et al.

In addition, there have been instances in which individuals with only mild manifestations have not been identified until adulthood. Skin markers of X-linked dominant chondrodysplasia punctata. The infant died at approximately 1 hour of age.

Radiographs showed generalized punctate calcifications of the epiphyseal regions of long bones, vertebrae, and the pelvic bone. Cataracts can caused blurred vision or decreased clarity of vision. Color blindness red and hunermaann, but not blue Ocular albinism 1 Norrie disease Choroideremia Other: X-linked dominant chondrodysplasia punctata CDPX2 caused by single gene mosaicism in a male.

A number sign is used with this entry hunnermann X-linked dominant chondrodysplasia punctata-2 CDPX2 is caused by mutation in the gene encoding delta 8 -delta 7 sterol isomerase emopamil-binding protein EBP; on chromosome Xp Happle reviewed 35 cases, all female.


Chondrodysplasia punctata, X-linked recessive type, is a form of chondrodysplasia punctata characterized by abnormal, symmetric, dotlike punctate calcifications within the growing ends of certain long bones i. Haemophilia A Haemophilia B X-linked sideroblastic anemia. Fetal warfarin syndrome, which may also be referred to as coumarin embryopathy, is a characteristic pattern of birth defects in a newborn resulting from exposure to certain anticlotting drugs i.

Florida Zoo Gives Girl with Conradi-Hünermann Syndrome an Unforgettable Day

Two of their mothers showed a mild form of cicatricial alopecia. While the OMIM database is open to the public, users seeking information about a personal medical or genetic condition are urged to consult with a sundrome physician for diagnosis and for answers to personal questions.

XXY male with X-linked dominant chondrodysplasia punctata Happle syndrome. Affected males are extremely rare and the clinical conrafi in males almost always result from postzygotic mosaicism for an EBP mutation summary by Aughton et al.

Scientists are still trying to understand exactly where the mutation occurs so that they can correct it. When the skeleton begins to develop, it predominately consists of cartilage, which is gradually replaced by bone. Chondrodysplasia punctata was first described in the medical literature by Drs.

Such nonpenetrant males would be scored as recombinants. The gene mutated in bare patches and striated mice encodes a novel 3-beta-hydroxysteroid dehydrogenase.

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. Mutations in the gene encoding 3-beta-hydroxysteroid-delta 8 ,delta 7 -isomerase cause X-linked dominant Conradi-Hunermann syndrome.

See, and for possible autosomal dominant forms of CDP.