Biogenesis of lysosome-related organelles complex 1 subunit 3 (BLOC1S3)

Biogenesis of lysosome-related organelles complex 1 subunit 3 (BLOC1S3) is a protein encoded by the *BLOC1S3* gene and forms part of the BLOC-1 complex, which consists of eight subunits including BLOS3. The BLOC-1 complex is essential for the normal biogenesis and function of lysosome-related organelles such as melanosomes in melanocytes and dense granules in platelets. Mutations in BLOC1S3 disrupt subunit stability, destabilizing the BLOC-1 complex and causing defects in protein trafficking–especially affecting melanogenic proteins like TYRP1, leading to pigment production defects and mis-trafficking of proteins. Dysfunction of BLOC1S3 causes Hermansky-Pudlak syndrome type 8 (HPS-8), a rare autosomal recessive disorder characterized by oculocutaneous albinism and bleeding tendency due to platelet storage pool deficiency. Some patients may also manifest immunodeficiency and gastrointestinal complications (e.g., granulomatous colitis), but pulmonary fibrosis is not typical for this subtype[3][4][5]. BLOC1S3 is not a typical therapeutic target (e.g., receptor, enzyme) but rather a structural protein in a trafficking complex essential for cellular organelle biogenesis.

Other names

BLOS3HPS8BLOC-1 subunit 3Biogenesis of Lysosome-related Organelles complex-1 Subunit 3Hermansky-Pudlak syndrome 8Reduced pigmentationMouse homolog of BLOC1S3