Case Report: unmasking pseudo-homozygosity in CYP21A2: intergenerational gene conversion expansion and the necessity of multimodal genetic testing - Takeaways - MDSpire
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Case Study: Revealing Pseudo-Homozygosity in CYP21A2 Through Intergenerational Gene Conversion Expansion and the Importance of Comprehensive Genetic Testing

  • By

  • Zuhal Altintas

  • Sefanur Karaca

  • Ayhan Coskun

  • August 18, 2026

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  • 1

    Mutations in the CYP21A2 gene cause Congenital Adrenal Hyperplasia (CAH), accounting for approximately 95% of cases.

  • 2

    Pseudo-homozygosity can occur in genetic testing, leading to misinterpretation of genotypes due to allele dropout.

  • 3

    The study describes a unique case of intergenerational gene conversion in a family with classical salt-wasting CAH.

  • 4

    Advanced genetic testing techniques, including MLPA and Sanger sequencing, are essential for accurate diagnosis and counseling.

  • 5

    The findings highlight the importance of multimodal genetic testing in managing high-risk pregnancies and resolving genetic discrepancies.

Original Source(s)

Case Report: unmasking pseudo-homozygosity in CYP21A2: intergenerational gene conversion expansion and the necessity of multimodal genetic testing

  • by Zuhal Altintas, Sefanur Karaca, Ayhan Coskun

  • August 18, 2026

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