ESPE Abstracts (2019) 92 P2-263

Novel Genotype in Two Siblings with 5-Alpha-Reductase 2 Deficiency:Different Clinical Course Due to the Time of Diagnosis

Mirjana Kocova1, Dijana Plaseska-Karanfilska2, Predrag Noveski2, Maja Kuzmanovska2

1Medical Faculty, Skopje, Macedonia, the former Yugoslav Republic of. 2Research Center for Genetic Engineering and Biotechnology "Georgi D. Efremov", Macedonian Academy of Science and Arts, Skopje, Macedonia, the former Yugoslav Republic of

Background: Steroid 5-Alpha-Reductase-2 deficiency(5-ARD) is a result of mutations in the SRD5A2 gene. It causes disorder of sexual differentiation(DSD) in 46XY individuals with a variable genital phenotype. We present two siblings with a female external genitalia at birth and bilateral inguinal testes, raised as females. These are the first molecularly sharacterized patients from the Republic of Macedonia with a different clinical course due to the time of the diagnosis.

Case presentation: Diagnosis of the Patient 1 was based upon the detection of bilateral inguinal testis and testosterone/dihidrotestosterone ratio. Sex reversal was initiated by testis removal at the age of 20 months. Breast implantation and vaginoplasty were performed in adolescence and the girl is comfortable with the female sex. Her sibling, Patient 2, raised as a girl, was clinically assessed at 11.5 years due to the growth of phalus, deep voice and Adam's apple enlargement.No change of the gender was accepted. Complex molecular analysis including multiplex quantitative fluorescent PCR screening for sex chromosome aneuploidies and SRY presence, Sanger sequencing combined with MLPA, aCGH, and real-time PCR analysis for detection of exon copy number changes confirmed a novel c.146C>A(p.Ala49Asp) point mutation in the first exon inherited from the mother and complete deletion of the first exon and adjucent regions inherited from the father.

Conclusion: Novel genotype causing 5-ARD is presented. Genetic analysis is useful for the diagnosis and timely gender of patients with 5-Alpha-Reductase 2 deficiency. However, final gender assignment is difficult and requires combined medical interventions.

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