Abstract

SANTANA HERNANDEZ, Elayne Esther et al. Genotype-phenotype correlation in patients with congenital adrenal hyperplasia diagnosed by neonatal screening. Rev Ciencias Médicas [online]. 2015, vol.19, n.5, pp.830-839. ISSN 1561-3194.

Introduction: congenital adrenal hyperplasia encompasses all inherited disorders of adrenal steroidogenesis cortisol, transmitted by autosomal recessive mutations. The enzyme 21-hydroxylase deficiency is the most frequent form of this disease, constituting 90 to 95% of cases. Objective: To correlate the phenotypic characteristics with genotype in patients suffering from congenital adrenal hyperplasia diagnosed by neonatal screening in Holguin province, Cuba. Material and method: a retrospective descriptive study was performed in 8 neonates with congenital adrenal hyperplasia per 21-hydroxylase deficiency, diagnosed by screening. They were asked for informed consent to perform physical examination and blood collection for the quantification of 17-hydroxyprogesterone and a molecular study that was performed at the Genetic National Center; mutations (P30L, Intron 2, 8 bp deletion and G318X) were sought. Results: 62.5% of the patients presented clinical symptoms, the two patients who presented the classic salt loss form, which is the severe neonatal disorder, exhibit various mutations in the pseudogene and the active gene mutation Intron 2, where 50% of mothers were homozygous or heterozygous for these mutations. Conclusions: the most frequent mutation found was Intron 2. Among the clinical features, macrogenitosomia prevailed and simple virilization. The correlation of phenotype-genotype was accomplished to the most affected.

Keywords : Congenital adrenal hyperplasia; Mixed function oxygenases.

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