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Mol Genet Metab. 2001 Apr;72(4):322-5.

Recurrent mutations in P- and T-proteins of the glycine cleavage complex and a novel T-protein mutation (N145I): a strategy for the molecular investigation of patients with nonketotic hyperglycinemia (NKH).

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  • 1Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.


Screening a DNA bank from 50 patients with enzymatic confirmation of their diagnosis of nonketotic hyperglycinemia gave allele frequencies of 5% for R515S of P-protein (glycine decarboxylase) and 7% for R320H of T-protein (aminomethyltransferase). In a previous report we found that 3% of the same patient alleles were positive for T-protein IVS7-1G>A. In total, testing for these three mutations identified 15% of alleles and positive results (one or two mutations) were found in 11 of the 50 patients. In addition, a novel point mutation in T-protein, N145I, was found in a single case and a PCR/restriction enzyme assay was developed for its detection.

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