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Bidchol, A.M. and Dalal, Ashwin and Trivedi, R. and Shukla, A. and Nampoothiri, S. and Sankar, V.H. and Danda, S. and Gupta, N. and Kabra, M. and Hebbar, S.A. and Bhat, R.Y. and Matta, D. and Ekbote, A.V. and Puri, R.D. and Phadke, S.R. and Gowrishankar, K. and Aggarwal, Shagun and Ranganath, P. and Sharda, S. and Kamate, M. and Datar, C.A. and Bhat, K. and Kamath, N. and Shah, H. and Krishna, S. and Gopinath, P.M. and Verma, I.C. and Nagarajaram, H.A. and Satyamoorthy, K. and Girisha, K.M. (2015) Recurrent and novel GLB1 mutations in India. Gene, 567 (2). pp. 173-181. ISSN 0378-1119

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Abstract

GM1 gangliosidosis is a lysosomal storage disorder caused by mutations in the GLB1 gene, leading to the deficiency of the enzyme β-d-galactosidase. In this study, we report molecular findings in 50 Asian Indian families with GM1 gangliosidosis. We sequenced all the exons and flanking intronic sequences of GLB1 gene. We identified 33 different mutations (20 novel and 13 previously reported). The novel mutations include 12 missense (p.M1?, p.E129Q, p.G134R, p.L236P, p.G262E, p.L297F, p.Y331C, p.G414V, p.K493N, p.L514P, p.P597L, p.T600I), four splicing (c.246-2A>G, c.397-2A>G, c.552+1G>T, c.956-2A>G), three indels (p.R22Qfs*8, p.L24Cfs*47, p.I489Qfs*4) and one nonsense mutation (p.Q452*). Most common mutations identified in this study were c.75+2InsT (14%) and p.L337P (10%). Known mutations accounted for 67% of allele frequency in our cohort of patients, suggesting that these mutations in GLB1 are recurrent across different populations. Twenty three mutations were localized in the TIM barrel domain, β-domain 1 and β-domain 2. In silico sequence and structure analysis of GLB1 reveal that all the novel mutations affect the function and structure of the protein. We hereby report on the largest series of patients with GM1 gangliosidosis and the first from India.

Item Type: Article
Depositing User: Dr P Divakar
Date Deposited: 16 May 2015 18:48
Last Modified: 12 Oct 2015 08:59
URI: http://cdfd.sciencecentral.in/id/eprint/36

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