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Rare mutations in the CYP21A2 gene detected in congenital adrenal hyperplasia.

Abstract
The purpose of this study was to identify and determine the frequencies of rare CYP21A2 gene mutations in patients with 21-hydroxylase deficiency (21-OHD) in the Cypriot population.

Direct sequencing and MLPA analysis of the CYP21A2 gene.
A group of families with 21-OHD were screened for the presence of rare CYP21A2 gene mutations. The rare V304M missense mutation was detected as compound heterozygous in two females with the nonclassical (NC) form of congenital adrenal hyperplasia (CAH). The rare F306insT was also detected in a female with severe salt wasting in the homozygous state and in cis in both alleles with the V281L mutation. Lastly, the rare A391T missense mutation was reported in a female patient with NC-CAH. A carrier rate of 2.1% for the V304M was also observed in a cohort of healthy controls.