This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
Uncombable hair syndrome (UHS) is a rare disorder of the hair shaft of the scalp. It is usually characterized by silvery-blond or straw-colored hair that is disorderly; stands out from the scalp; and cannot be combed flat. It may first become apparent from 3 months of age to 12 years of age. Most cases are isolated, but in some cases it has been described in association with other diseases, such as ectodermal dysplasias, Bork syndrome and Angel-shaped phalangoepiphyseal dysplasia. The syndrome has been found to be caused by mutations in the genes PADI3, TGM3, and TCHH. These three genes code for proteins that are involved in hair shaft formation. The syndrome appears to be inherited in an autosomal recessive fashion; however, cases inherited in an autosomal dominant manner may also exist, as there are other genes involved in hair formation. The condition often spontaneously regresses in late childhood. Some published studies suggest that biotin may improve the condition.
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