CYP21A2 mutation update: Comprehensive analysis of databases and published genetic variants

Area of Science:

• Genetics
• Endocrinology
• Molecular Biology

Background:

• Congenital adrenal hyperplasia (CAH) comprises autosomal recessive disorders of adrenal steroidogenesis, with 21-hydroxylase deficiency accounting for over 95% of cases.
• Clinical presentations of 21-hydroxylase deficiency range from severe classical to mild non-classical forms.
• The CYP21A2 gene harbors allelic variants, with previous studies primarily identifying pathogenic variants from clinical settings.

Purpose of the Study:

• To create an integrated database of genetic variants (GVs) in the CYP21A2 gene.
• To compile and analyze information on CYP21A2 variants, including their functional implications and phenotypic effects.
• To facilitate genetic counseling for families affected by 21-hydroxylase deficiency.

Main Methods:

• Gathered 1,340 genetic variants (GVs) in the CYP21A2 gene from various sources.
• Identified 899 unique variants and 230 variants with documented effects on human health.
• Integrated sequence information with phenotypic effects for all available mutations, including double mutants in cis.

Main Results:

• Compiled a comprehensive database of 1,340 CYP21A2 genetic variants.
• Identified 899 unique variants, with 230 having a significant impact on human health.
• Established connections between CYP21A2 sequence variations and their associated phenotypic outcomes.

Conclusions:

• The integrated database provides a valuable resource for understanding CYP21A2 gene variants in congenital adrenal hyperplasia.
• Linking genetic variants to phenotypic effects aids in diagnosing and managing 21-hydroxylase deficiency.
• This compilation supports physicians in providing genetic counseling to families affected by CAH.