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Hermansky-Pudlak syndrome type 7 (HPS-7) results from mutant dysbindin, a member of the biogenesis of lysosome-related organelles complex 1 (BLOC-1).

Authors: Li, W  Zhang, Q  Oiso, N  Novak, EK  Gautam, R  O'Brien, EP  Tinsley, CL  Blake, DJ  Spritz, RA  Copeland, NG  Jenkins, NA  Amato, D  Roe, BA  Starcevic, M  Dell'Angelica, EC  Elliott, RW  Mishra, V  Kingsmore, SF  Paylor, RE  Swank, RT 
Citation: Li W, etal., Nat Genet. 2003 Sep;35(1):84-9. Epub 2003 Aug 17.
Pubmed: (View Article at PubMed) PMID:12923531
DOI: Full-text: DOI:10.1038/ng1229

Hermansky-Pudlak syndrome (HPS; MIM 203300) is a genetically heterogeneous disorder characterized by oculocutaneous albinism, prolonged bleeding and pulmonary fibrosis due to abnormal vesicle trafficking to lysosomes and related organelles, such as melanosomes and platelet dense granules. In mice, at least 16 loci are associated with HPS, including sandy (sdy; ref. 7). Here we show that the sdy mutant mouse expresses no dysbindin protein owing to a deletion in the gene Dtnbp1 (encoding dysbindin) and that mutation of the human ortholog DTNBP1 causes a novel form of HPS called HPS-7. Dysbindin is a ubiquitously expressed protein that binds to alpha- and beta-dystrobrevins, components of the dystrophin-associated protein complex (DPC) in both muscle and nonmuscle cells. We also show that dysbindin is a component of the biogenesis of lysosome-related organelles complex 1 (BLOC-1; refs. 9-11), which regulates trafficking to lysosome-related organelles and includes the proteins pallidin, muted and cappuccino, which are associated with HPS in mice. These findings show that BLOC-1 is important in producing the HPS phenotype in humans, indicate that dysbindin has a role in the biogenesis of lysosome-related organelles and identify unexpected interactions between components of DPC and BLOC-1.

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CRRD Object Information
CRRD ID: 11251756
Created: 2016-06-21
Species: All species
Last Modified: 2016-06-21
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.