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Bleeding and Platelet Disorders v0.210 BLOC1S5 Zornitza Stark Phenotypes for gene: BLOC1S5 were changed from Hermansky–Pudlak syndrome type 11, no OMIM# to Hermansky–Pudlak syndrome type 11, MIM#619172
Bleeding and Platelet Disorders v0.202 BLOC1S5 Zornitza Stark Marked gene: BLOC1S5 as ready
Bleeding and Platelet Disorders v0.202 BLOC1S5 Zornitza Stark Gene: bloc1s5 has been classified as Green List (High Evidence).
Bleeding and Platelet Disorders v0.202 BLOC1S5 Zornitza Stark Classified gene: BLOC1S5 as Green List (high evidence)
Bleeding and Platelet Disorders v0.202 BLOC1S5 Zornitza Stark Gene: bloc1s5 has been classified as Green List (High Evidence).
Bleeding and Platelet Disorders v0.201 BLOC1S5 Chirag Patel gene: BLOC1S5 was added
gene: BLOC1S5 was added to Bleeding Disorders. Sources: Literature
Mode of inheritance for gene: BLOC1S5 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: BLOC1S5 were set to PMID: 32565547
Phenotypes for gene: BLOC1S5 were set to Hermansky–Pudlak syndrome type 11, no OMIM#
Review for gene: BLOC1S5 was set to GREEN
gene: BLOC1S5 was marked as current diagnostic
Added comment: 2 unrelated patients with mild oculocutaneous albinism, moderate bleeding diathesis, platelet aggregation deficit, and a dramatically decreased number of platelet dense granules, all signs compatible with HPS. Identified distinct homozygous variants in the BLOC1S5 gene (patient 1: deletion of exons 3 and 4, patient 2: 1-bp deletion in exon 4). Parental segregation confirmatory in patient 1, quantitative PCR analysis confirmatory in patient 2).

Functional tests performed on platelets of one patient displayed an absence of the obligate multisubunit complex BLOC-1, showing that the variant disrupts BLOC1S5 function and impairs BLOC-1 assembly. Expression of the patient-derived BLOC1S5 deletion in nonpigmented murine Bloc1s5-/- melan-mu melanocytes failed to rescue pigmentation, the assembly of a functional BLOC-1 complex, and melanosome cargo trafficking, unlike the wild-type allele.

Pathogenic variants in the genes encoding three other BLOC-1 subunits (DTNBP1, BLOC1S3, and BLOC1S6) underlie HPS types 7, 8, and 9 respectively.
Sources: Literature
Bleeding and Platelet Disorders v0.201 BLOC1S5 Chirag Patel gene: BLOC1S5 was added
gene: BLOC1S5 was added to Bleeding Disorders. Sources: Literature
Mode of inheritance for gene: BLOC1S5 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: BLOC1S5 were set to PMID: 32565547
Phenotypes for gene: BLOC1S5 were set to Hermansky–Pudlak syndrome type 11, no OMIM#
Review for gene: BLOC1S5 was set to GREEN
gene: BLOC1S5 was marked as current diagnostic
Added comment: 2 unrelated patients with mild oculocutaneous albinism, moderate bleeding diathesis, platelet aggregation deficit, and a dramatically decreased number of platelet dense granules, all signs compatible with HPS. Identified distinct homozygous variants in the BLOC1S5 gene (patient 1: deletion of exons 3 and 4, patient 2: 1-bp deletion in exon 4). Parental segregation confirmatory in patient 1, quantitative PCR analysis confirmatory in patient 2).

Functional tests performed on platelets of one patient displayed an absence of the obligate multisubunit complex BLOC-1, showing that the variant disrupts BLOC1S5 function and impairs BLOC-1 assembly. Expression of the patient-derived BLOC1S5 deletion in nonpigmented murine Bloc1s5-/- melan-mu melanocytes failed to rescue pigmentation, the assembly of a functional BLOC-1 complex, and melanosome cargo trafficking, unlike the wild-type allele.

Pathogenic variants in the genes encoding three other BLOC-1 subunits (DTNBP1, BLOC1S3, and BLOC1S6) underlie HPS types 7, 8, and 9 respectively.
Sources: Literature