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NGS-based targeted resequencing identified rare subtypes of albinism; providing accurate molecular diagnosis for Japanese patients with albinism.

Research paper by Ken K Okamura, Masahiro M Hayashi, Yuko Y Abe, Michihiro M Kono, Kimiko K Nakajima, Yumi Y Aoyama, Chikako C Nishigori, Hiroshi H Ishimoto, Yuji Y Ishimatsu, Mika M Nakajima, Yutaka Y Hozumi, Tamio T Suzuki

Indexed on: 31 May '19Published on: 30 May '19Published in: Pigment Cell & Melanoma Research



Abstract

Albinism, which is commonly inherited as an autosomal recessive trait, is characterized by a reduction or absence of melanin in the eyes, skin, and hair. To date, more than 20 causal genes for albinism have been identified; thus, the accurate diagnosis of albinism requires next-generation sequencing (NGS). In this study, we analyzed 46 patients who tested negative for oculocutaneous albinism (OCA)1-4 and Hermansky-Pudlak syndrome (HPS)1 based on conventional analysis, in addition to 28 new Japanese patients, using NGS-based targeted resequencing. We identified a genetic background for albinism in 18 of the 46 patients (39%), who were previously tested negative according to the conventional analysis. In addition, we unveiled a genetic predisposition towards albinism in 23 of the 28 new patients (82%). We identified 6 patients with rare subtypes of albinism, including HPS3, HPS4, and HPS6, and found 12 novel pathological mutations in albinism-related genes. Furthermore, most patients who were not diagnosed with albinism by the NGS analysis showed mild manifestations of albinism without apparent eye symptoms and harbored only one heterozygous mutation, occasionally in combination with skin-color associated gene variants. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.