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Conradi–Hünermann syndrome
Conradi–Hünermann syndrome (also known as "Conradi–Hünermann–Happle syndrome", "Happle syndrome,"〔 and "X-linked dominant chondrodysplasia punctata") is a type of chondrodysplasia punctata. It is associated with the gene EBP (gene) and affects between one in 100,000 and one in 200,000 babies.
==Description==
Conradi–Hünermann syndrome is a form of chondrodysplasia punctata, a group of rare genetic disorders of skeletal development involving abnormal accumulations of calcium salts within the growing ends of long bones. Conradi–Hünermann syndrome is commonly associated with mild to moderate growth deficiency, disproportionate shortening of long bones, particularly those of the upper arms and the thigh bones, short stature, and/or curvature of the spine. In rare cases, intellectual disability may also be present. While evidence suggests that Conradi–Hünermann syndrome predominantly occurs in females and is usually inherited as an X-linked dominant trait, rare cases in which males were affected have also been reported.
The genetics of Conradi–Hünermann syndrome has perplexed medical geneticists, pediatricians and dermatologists for some time, but a number of perplexing features of the genetics of the syndrome have now been resolved, including the fact that the disease is caused by mutations in a gene, and these mutations are simple substitutions, deletions or insertions and are therefore not "unstable". Scientists are still trying to understand exactly where the mutation occurs so that they can correct it.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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