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A Novel Nonsense Mutation c.374C>G in CYP21A2 Gene of a Vietnamese Patient with Congenital Adrenal Hyperplasia.
Advances in Experimental Medicine and Biology 2019 March 7
Inactivating mutations of the CYP21A2 gene, encoding for steroid synthesis, have been reported in patients with congenital adrenal hyperplasia (CAH). We report a case of an infant who were diagnosed with CAH and presented with the severe phenotype of CAH with symptoms such as increased testicular volume, elevated of 17-hydroxyprogesteron, testosterone and progesterone. In this study, we established an assay for the detection of unusual genetic in the CYP21A2 gene in the proband and his family. A novel nonsense mutation c.374C > G which caused a substitutions of Serine for a stop codon at codon 125 (p.S125* ) within exon 3 was found in the proband. Parental genotype studies confirmed carrier state in the father, but the mother showed a wild allele by PCR and sequencing. This inspired us to find deletions using multiplex ligation-dependent probe amplification (MLPA) technique. The probands were found to have a large deletion in exons 1 and 3, while the mother only had deletion in exon 1. Therefore, mutation c.374C > G (p.S125* ) in the proband is considered as a heterozygous deletion. This mutation caused a truncated protein which lead to the salt wasting CAH phenotype of the proband. This novel nonsense mutation expands the CYP21A2 mutation spectrum in CAH disorder. This case also highlights the need of caution when interpreting results of molecular genetic testing during genetic counseling.
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