Brittle hair syndrome, Sabinas type

Brittle hair syndrome, Sabinas type (also known as Sabinas brittle hair syndrome) is an extremely rare autosomal recessive condition first described in an isolated community in Sabinas, Coahuila, Mexico. The syndrome is characterized by brittle, fragile hair that breaks easily and fails to grow to normal length. The hair abnormality is due to a deficiency of high-sulfur proteins in the hair shaft, leading to structural weakness. Affected individuals typically present with short, sparse, and brittle scalp hair from early childhood. The hair may appear dry and lusterless, and microscopic examination reveals abnormalities in the hair shaft structure. In addition to the hair findings, individuals with Sabinas brittle hair syndrome may exhibit mild intellectual disability and nail abnormalities. The condition primarily affects the integumentary system (hair and nails) and the central nervous system. Unlike some other brittle hair syndromes such as trichothiodystrophy, Sabinas type has been described as a distinct entity based on its geographic clustering and specific biochemical hair findings. There is currently no specific curative treatment for Sabinas brittle hair syndrome. Management is supportive and focuses on gentle hair care to minimize breakage, avoidance of chemical or physical trauma to the hair, and developmental support for individuals with intellectual disability. Genetic counseling is recommended for affected families. Due to the extreme rarity of this condition, knowledge about its full clinical spectrum and long-term prognosis remains limited.

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