Genetic Steroid Disorders: Chapter 3B. The History of Prenatal Diagnosis of Congenital Adrenal Hyperplasia Book PDF, ePub eBook

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Book Descriptions:
Congenital adrenal hyperplasia (CAH) owing to 21-hydroxylase deficiency (21OHD) is a disorder of adrenal steroidogenesis, which causes virilization of external genitalia in females affected with the severe form of the disease. However, genital ambiguity is preventable with prenatal treatment with dexamethasone during the first trimester. While prenatal treatment has remained largely unchanged since its institution, prenatal diagnosis of CAH has witnessed a number of advancements in the past 50 years. The first successful prenatal diagnosis utilized hormonal measurements of the amniotic fluid. Elevated levels of 17α-hydroxyprogesterone in the amniotic fluid became diagnostic for a fetus affected with the severe form of the disorder. This finding was followed by the discovery of the close linkage between the disease and the HLA complex, which led to HLA linkage studies as a second approach for prenatal diagnosis. Cloning of the CYP21A2 gene ushered in molecular genetic analysis as the third method for prenatal diagnosis. Using polymerase chain reaction (PCR)-based methods to amplify the CYP21A2 active gene, and not the CYP21A1P pseudogene, diagnostic procedures increased in specificity and led to accurate prenatal diagnosis in the first trimester. The advent of non-invasive prenatal diagnosis heralds a new development for prenatal diagnosis of CAH, with the potential for improved safety, earlier detection, and increased accessibility.

Genetic Steroid Disorders: Chapter 3B. The History of Prenatal Diagnosis of Congenital Adrenal Hyperplasia by Denesy Mancenido, Maria I. New

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