Hermansky-Pudlak syndrome 4 protein mRNA (HPS4 mRNA)

Hermansky-Pudlak syndrome 4 protein (HPS4) mRNA encodes a critical subunit of the Biogenesis of Lysosome-related Organelles Complex-3 (BLOC-3), which functions as a guanine nucleotide exchange factor for Rab32 and Rab38. This complex is essential for the proper formation and trafficking of specialized organelles, including melanosomes in melanocytes and dense granules in platelets. Mutations in the HPS4 gene lead to Hermansky-Pudlak syndrome type 4, a rare autosomal recessive disorder characterized by oculocutaneous albinism, bleeding tendencies, and a high risk of fatal pulmonary fibrosis. While there are currently no approved drugs that directly target HPS4 mRNA, it represents a significant target for emerging mRNA-based protein replacement therapies and gene editing technologies aimed at restoring functional BLOC-3 activity. Clinical management currently focuses on symptomatic treatment, such as using the antifibrotic agent nintedanib to stabilize lung function in patients with associated interstitial lung disease.

Other names

HPS4BLOC3S2 mRNALE mRNALight-ear protein homolog mRNABiogenesis of lysosomal organelles complex 3 subunit 2 mRNA

Nintedanib acts as a multi-tyrosine kinase inhibitor to manage associated pulmonary fibrosis; hypothetical mRNA-based therapies would function via protein replacement to restore BLOC-3 complex activity.