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.
Molecular Genetics and Metabolism – Elsevier
Published: Apr 1, 2001
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