Frameshift Sequence Variants in the Human Lipase-H Gene Causing Hypotrichosis

Area of Science:

• Genetics
• Dermatology
• Molecular Biology

Background:

• Hypotrichosis is a rare hair disorder characterized by sparse to absent hair, often with woolly texture and scalp involvement.
• Associated features can include hair discoloration and keratin-filled cysts.
• Autosomal recessive inheritance patterns are common in certain forms of hypotrichosis.

Purpose of the Study:

• To investigate the genetic basis of inherited hypotrichosis and woolly hair.
• To identify specific gene variants responsible for the observed phenotype.
• To further elucidate the role of the lipase H (LIPH) gene in hair development.

Main Methods:

• Sequence analysis of the lipase H (LIPH) gene in affected families.
• Genetic mapping of the LIPH gene to chromosome 3q27.3.
• Segregation analysis to confirm autosomal recessive inheritance.

Main Results:

• Identification of a novel frameshift deletion variant (c.932delC, p.Pro311Leufs*3) in the LIPH gene in one family.
• Confirmation of a previously reported 2-bp deletion (c.659_660delTA) in the LIPH gene in five other families.
• All identified variants segregated with the hypotrichosis and woolly hair phenotype in an autosomal recessive manner.

Conclusions:

• Sequence variants in the LIPH gene are a cause of inherited hypotrichosis and woolly hair.
• This study expands the known spectrum of LIPH gene mutations associated with hair disorders.
• The findings reinforce the critical role of the LIPH gene in normal hair development and structure.