Bashyam, M.D. and Chaudhary, A.K. and Kiran, M. and Nagarajaram, H.A. and Radha Rama Devi, A. and Ranganath, P. and Dalal, Ashwin and Bashyam, L. and Gupta, N. and Kabra, M. and Muranjan, M. and Puri, R.D. and Verma, I.C. and Nampoothiri, S. and Kadandale, J.S. (2014) Splice, insertion-deletion and nonsense mutations that perturb the phenylalanine hydroxylase transcript cause phenylketonuria in India. Journal of Cellular Biochemistry, 115 (3). pp. 566-74. ISSN 1097-4644

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Abstract

Phenylketonuria (PKU) is an autosomal recessive metabolic disorder caused by mutational inactivation of the phenylalanine hydroxylase (PAH) gene. Missense mutations are the most common PAH mutation type detected in PKU patients worldwide. We performed PAH mutation analysis in 27 suspected Indian PKU families (including 7 from our previous study) followed by structure and function analysis of specific missense and splice/insertion-deletion/nonsense mutations, respectively. Of the 27 families, disease-causing mutations were detected in 25. A total of 20 different mutations were identified of which 7 "unique" mutations accounted for 13 of 25 mutation positive families. The unique mutations detected exclusively in Indian PKU patients included three recurrent mutations detected in three families each. The 20 mutations included only 5 missense mutations in addition to 5 splice, 4 each nonsense and insertion-deletion mutations, a silent variant in coding region and a 3'UTR mutation. One deletion and two nonsense mutations were characterized to confirm significant reduction in mutant transcript levels possibly through activation of nonsense mediated decay. All missense mutations affected conserved amino acid residues and sequence and structure analysis suggested significant perturbations in the enzyme activity of respective mutant proteins. This is probably the first report of identification of a significantly low proportion of missense PAH mutations from PKU families and together with the presence of a high proportion of splice, insertion-deletion, and nonsense mutations, points to a unique PAH mutation profile in Indian PKU patients.

Item Type:	Article
Subjects:	Genetics Molecular Biology
Depositing User:	Users 2 not found.
Date Deposited:	21 May 2015 17:50
Last Modified:	10 May 2019 10:04
URI:	http://cdfd.sciencecentral.in/id/eprint/71

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