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Recurrent and novel mutations of GCDH gene in Chinese glutaric acidemia type I families

✍ Scribed by Nelson L.S. Tang; Joannie Hui; L.K. Law; Y.Y. Lam; K.Y. Chan; W.L. Yeung; Albert Y.W. Chan; K.L. Cheung; T.F. Fok

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 35 KB
Volume: 16
Category: Article
ISSN: 1059-7794
DOI: 10.1002/1098-1004(200011)16:5<446::aid-humu14>3.0.co;2-y

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✦ Synopsis

Glutaric acidemia type I is caused by mutations of the glutaryl-CoA dehydrogenase (GCDH) gene resulting in loss of GCDH enzyme activity. Patients present with progressive dystonia and lesions in basal ganglia. Dietary treatment, when instituted from the early neonatal period, markedly reduces dystonia and morbidity. Early diagnosis and prenatal diagnosis will be facilitated by knowledge of locally prevalent GCDH mutations. Several common GCDH mutations have been found in different ethnic groups. GCDH mutations were studied in 5 Chinese glutaric acidemia type I families. We detected two novel recurrent mutations (A219T and IVS10-2A>C) which were found in two unrelated families. An asymptomatic carrier of IVS10-2A>C was also found on screening of 120 individuals. Other mutations were identified, including two other novel (R386G & IVS3+1G>A) and two known mutations (G178R & R355H). Fibroblasts from patients carrying the novel mutations were confirmed to be deficient for GCDH activity. This is the first report of GCDH mutations describing recurrent mutations in Chinese patients. The carrier rate of IVS10-2A>C may be particularly high in Chinese.

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