1. Hermansky-Pudlak syndrome type 1 in patients of Indian descent.
- Author
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Vincent LM, Adams D, Hess RA, Ziegler SG, Tsilou E, Golas G, O'Brien KJ, White JG, Huizing M, and Gahl WA
- Subjects
- Base Sequence, Blood Platelets ultrastructure, Child, Child, Preschool, DNA Mutational Analysis, Female, Humans, India, Infant, Male, Membrane Proteins genetics, Molecular Sequence Data, Asian People genetics, Hermanski-Pudlak Syndrome genetics
- Abstract
Hermansky-Pudlak syndrome (HPS) develops from defects in the biogenesis and/or function of lysosome-related organelles essential to membrane and protein trafficking. Of the eight known human subtypes, only HPS-1 and HPS-4 develop pulmonary fibrosis in addition to the general clinical manifestations of oculocutaneous albinism and bleeding diathesis. We identified HPS-1 in three unrelated patients from different regions of India, who presented with iris transillumination, pale fundi, hypopigmentation, nystagmus, decreased visual acuity, and a bleeding diathesis. Two of these patients carried the homozygous mutation c.398+5G>A (IVS5+5G>A) in HPS1, resulting in skipping of exon 5 in HPS1 mRNA. The third patient carried a novel homozygous c.988-1G>T mutation that resulted in in-frame skipping of HPS1 exon 12 and removes 56 amino acids from the HPS1 protein. Given the discovery of HPS-1 in an ethnic group where oculocutaneous albinism (OCA) is highly prevalent, it is possible that HPS in India is under-diagnosed. We recommend that unconfirmed OCA patients in this ethic group be considered for mutational screening of known HPS genes, in particular c.398+5G>A and c.980-1G>T, to ensure that patients can be monitored and treated for clinical complications unique to HPS.
- Published
- 2009
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