A Homozygous Mutation in GPT2 Associated with Nonsyndromic Intellectual Disability in a Consanguineous Family from Costa Rica

Lobo-Prada T, Sticht H, Bogantes-Ledezma S, Ekici AB, Uebe S, Reis A, Leal A (2017)

Publication Type: Journal article

Publication year: 2017

Journal

JIMD reports Society for the Study of Inborn Errors of Metabolism

Book Volume: 36

Pages Range: 59-66

DOI: 10.1007/8904_2016_40

Abstract

Intellectual disability is a highly heterogeneous disease that affects the central nervous system and impairs patients' ability to function independently. Despite multiples genes involved in the etiology of disease, most of the genetic background is yet to be discovered. We used runs of homozygosity and exome sequencing to study a large Costa Rican family with four individuals affected with severe intellectual disability and found a novel homozygous missense mutation, p. 96G>R, c. 286G>A, in all affected individuals. This gene encodes for a pyridoxal enzyme involved in the production of the neurotransmitter glutamate and is highly expressed in the white matter of brain and cerebellum. Protein modeling of GPT2 predicted that the mutation is located in a loop where the substrate binds to the active site of the enzyme, therefore, suggesting that the catalytic activity is impaired. With our report of a second mutation we fortify the importance of GPT2 as a novel cause of autosomal recessive nonsyndromic intellectual disability and support the premise that GPT2 is highly important for the neurodevelopment of the central nervous system.The mutation p. 96G>R c. 286G>A in GPT2, located in a loop where the substrate binds to the active site of the enzyme, fortifies the importance of GPT2 in the pathogenesis of nonsyndromic intellectual disability.

Authors with CRIS profile

Heinrich Sticht Professur für Bioinformatik Arif Bülent Ekici Institute of Human Genetics Steffen Uebe Institute of Human Genetics André Wiesmann da Silva Reis Lehrstuhl für Humangenetik

Involved external institutions

Universidad de Costa Rica CR Costa Rica (CR)

How to cite

APA:

Lobo-Prada, T., Sticht, H., Bogantes-Ledezma, S., Ekici, A.B., Uebe, S., Reis, A., & Leal, A. (2017). A Homozygous Mutation in GPT2 Associated with Nonsyndromic Intellectual Disability in a Consanguineous Family from Costa Rica. JIMD reports, 36, 59-66. https://dx.doi.org/10.1007/8904_2016_40

MLA:

Lobo-Prada, Tanya, et al. "A Homozygous Mutation in GPT2 Associated with Nonsyndromic Intellectual Disability in a Consanguineous Family from Costa Rica." JIMD reports 36 (2017): 59-66.

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