Abstract

Gray Platelet Syndrome (GPS) is an autosomal recessive bleeding disorder with large platelets that lack α-granules. We found that mutations of NBEAL2 (neurobeachin-like 2), encoding a BEACH/ARM/WD40 domain protein, cause GPS. We demonstrated that human megakaryocytes and platelets express a unique combination of NBEAL2 transcripts. Proteomic analysis of sucrose-gradient subcellular fractions of platelets indicated that NBEAL2 localizes to the dense tubular system (endoplasmic reticulum) in platelets.

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