Identification of three novel 6-pyruvoyl-tetrahydropterin synthase gene mutations (226C>T, IVS3+1G>A, 116-119delTGTT) in Chinese hyperphenylalaninemia caused by tetrahydrobiopterin synthesis deficiency
✍ Scribed by Tze-Tze Liu; Yu-Hsin Chang; Szu-Hui Chiang; Yan-Ling Yang; Wei-Min Yu; Kwang-Jen Hsiao
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 228 KB
- Volume
- 18
- Category
- Article
- ISSN
- 1059-7794
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✦ Synopsis
The enzyme 6-Pyruvoyl-tetrahydropterin synthase (PTS) deficiency is the major cause of BH 4 -deficient HPA. The frequency of BH 4 -deficient HPA was estimated to be around 30% among Chinese HPA population in Taiwan, which is much higher than that in Caucasian population (1.5-2% of HPA). Approximately 86% of Chinese BH 4 -deficient HPA was found to be caused by PTS-deficiency. Seven mutations -namely R25G, N52S, V56M, V70D, P87S, D96N, and T106M -had been identified in Chinese PTS-deficient patients previously. In this study, five additional mutations in the PTS gene, namely 200C>T (T67M), 226C>T (L76F), IVS3+1G>A (K54X), 116-119delTGTT (K38X) and 169-171delGTG (V57del), were identified by PCR and DNA sequencing in Chinese PTS-deficient patients. The 116-119delTGTT introduces a frameshift stop after lysine of codon 38 (K38X). The G-to-A transition at the consensus sequence of splicing donor site of exon 3 (IVS3+1G>A) resulted in exon 3 skipping of the PTS transcript and caused a frameshift stop after lysine of codon 54 (K54X). The T67M and V57del mutations have been found in Caucasian PTS deficient patients, while the L76F, IVS3+1G>A, and K38X mutations are novel. None of 100 normal alleles screened was found to have the L76F substitution