Hermansky-Pudlak syndrome: Mutation update.

Area of Science:

• Genetics
• Molecular Biology
• Medical Genetics

Background:

• Hermansky-Pudlak syndrome (HPS) comprises 10 distinct autosomal recessive disorders.
• HPS is characterized by albinism and bleeding issues, with additional symptoms varying by genetic defect.
• Defective genes encode components of protein complexes like AP-3 and BLOC-1 through -3, impacting lysosome-related organelle biogenesis.

Purpose of the Study:

• To review reported and novel variants in 10 HPS genes.
• To provide pathogenicity predictions for missense and splice site variants.
• To summarize current cellular and clinical aspects of HPS for diagnostics and genetic counseling.

Main Methods:

• Compilation and analysis of 264 reported and novel variants across 10 HPS genes.
• Estimation of HPS subject numbers by ethnicity.
• In silico pathogenicity predictions for specific variant types.

Main Results:

• Summary of variants in 10 HPS genes, including frequency data.
• Identification of variants associated with specific HPS subtypes and clinical features.
• Estimated prevalence of HPS subjects, with a notable number in Puerto Rico.

Conclusions:

• Subtyping HPS is crucial for accurate prognosis, clinical management, and treatment strategies.
• This review serves as a resource for molecular diagnostics and genetic counseling in HPS.
• Understanding genetic variants aids in predicting disease course and potential therapeutic targets.