Identification of the mutations in the T-protein gene causing typical and atypical nonketotic hyperglycinemia |
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Authors: | Kenji Nanao Kazuko Okamura-Ikeda Yutaro Motokawa David M Danks E Regula Baumgartner Goro Takada Kiyoshi Hayasaka |
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Institution: | (1) Department of Pediatrics, Akita University School of Medicine, 010 Akita, Japan;(2) Institute for Enzyme Research, University of Tokushima, 770 Tokushima, Japan;(3) Murdoch Institute, Royal Children's Hospital, Parkville, Australia;(4) Metabolic Unit, University Children's Hospital, Basel, Switzerland;(5) Department of Pediatrics, Yamagata University School of Medicine, 990-23 Yamagata, Japan;(6) Department of Pediatrics, Yamagata University School of Medicine, Iidanishi 2-2-2, 990-23 Yamagata, Japan |
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Abstract: | We have investigated the molecular lesions of T-protein deficiency causing typical or atypical nonketotic hyperglycinemia (NKH) in two unrelated pedigrees. A patient with typical NKH was identified as being homozygous for a missense mutation in the T-protein gene, a G-to-A transition leading to a Gly-to-Asp substitution at amino acid 269 (G269D). Sibling patients of a second family with atypical NKH had two different missense mutations in the T-protein gene (compound heterozygote), a G-to-A transition leading to a Gly-to-Arg substitution at amino acid 47 (G47R) in one allele, and a G-to-A transition leading to an Arg-to-His substitution at amino acid 320 (R320H) in the other allele. Gly 269 is conserved in T-proteins of various species, even in E. coli, whereas Gly 47 and Arg 320 are replaced by Ala and Leu, respectively, in E. coli. The mutation occurring in more conservative amino acid residues thus results in more deleterious damage to the T-protein, and gives the severe clinical phenotype, viz., typical NKH. |
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