Any Hermansky-Pudlak syndrome in which the cause of the disease is a mutation in the BLOC1S3 gene. The disease is MONDO_0013560 (Hermansky-Pudlak syndrome 8). Also known as: BLOC1S3 Hermansky-Pudlak syndrome, HPS8, Hermansky-Pudlak syndrome caused by mutation in BLOC1S3, Hermansky-Pudlak syndrome type 8.