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PubMed1990

Trichothiodystrophy: review of sulfur-deficient brittle hair syndromes and association with the ectodermal dysplasias.

Trichothiodystrophy appears to represent a central pathologic feature of a specific hair dysplasia associated with several disorders in organs derived from ectoderm and neuroectoderm. The key finding is brittle hair with low sulfur content, but alternating dark and light bands under polarizing microscopy, trichoschisis, and absent or defective cuticle are additional important clues for the diagnosis of trichothiodystrophy. Our review of the literature revealed extensive associated findings in trichothiodystrophy. Classification of patients with trichothiodystrophy and other dysplasias is difficult because diminution of sulfur-rich protein in hair is not a sufficient marker to allow precise differentiation, although several similar ectodermal dysplasias can be excluded by demonstration of abnormal sulfur content in hair of patients with trichothiodystrophy. Patients with trichothiodystrophy should have a thorough evaluation for other associated manifestations, including investigation of photosensitivity and DNA repair defects. Detection of low-sulfur brittle hair syndrome is also important for genetic counseling because the disease appears to be inherited in an autosomal recessive pattern.

DNA Repair↗