Seventeen Novel Mutations in PCCA and PCCB Genes in Indian Propionic Acidemia Patients, and Their Outcomes

Deepti Gupta, Sunita Bijarnia-Mahay, Sudha Kohli, Renu Saxena, Ratna Dua Puri, Yosuke Shigematsu, Seiji Yamaguchi, Osamu Sakamoto, Neerja Gupta, Madhulika Kabra, Seema Thakur, Roumi Deb, Ishwar Chander Verma

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7 Citations (Scopus)

Abstract

Aims: The goal of this study was to identify mutations in the propionyl-CoA carboxylase alpha subunit (PCCA) and propionyl-CoA carboxylase beta subunit (PCCB) genes, and to assess their effects on propionic academia (PA) patients. Methodology: Twenty-five Indian children with PA were enrolled in this study. Bidirectional Sanger sequencing was performed on both the coding and flanking regions of the PCCA and PCCB genes and the chromatograms were analyzed. Bioinformatic tools were used to classify novel variations into pathogenic or benign. Results: The majority of the cases (19/25, 76%) were of the early-onset (<90 days of age) type and 5 were of the late-onset type. The majority of patients had mutations in the PCCA gene (18/25). A total of 26 mutations were noted: 20 in the PCCA gene and 6 in PCCB gene. Seventeen mutations were novel (14 in PCCA and 3 in PCCB). The SNP c.937C>T (p.Arg313Ter), was noted in 9/36 (25%) alleles in the PCCA gene. All of the children were symptomatic and only three survived who are doing well with no major disabilities. Conclusion: The spectrum of mutations in the PCCA and PCCB genes among Indians is distinct from other populations. The absence of a common mutation signifies the heterogeneity and admixture of various subpopulations. These findings also suggest that individuals of Indian origin may not benefit from the mutation-based "carrier screening panels" offered by many genetic laboratories.

Original languageEnglish
Pages (from-to)373-382
Number of pages10
JournalGenetic Testing and Molecular Biomarkers
Volume20
Issue number7
DOIs
Publication statusPublished - 2016 Jul

ASJC Scopus subject areas

  • Genetics(clinical)

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    Gupta, D., Bijarnia-Mahay, S., Kohli, S., Saxena, R., Puri, R. D., Shigematsu, Y., Yamaguchi, S., Sakamoto, O., Gupta, N., Kabra, M., Thakur, S., Deb, R., & Verma, I. C. (2016). Seventeen Novel Mutations in PCCA and PCCB Genes in Indian Propionic Acidemia Patients, and Their Outcomes. Genetic Testing and Molecular Biomarkers, 20(7), 373-382. https://doi.org/10.1089/gtmb.2016.0017