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Response to: Letter to Editor - Utility of Genetic Work-Up for 46, XY Patients with Severe Hypospadias

Published:December 17, 2022DOI:https://doi.org/10.1016/j.jpurol.2022.12.007

      Structured Abstract

      Objective

      Hypospadias is a common congenital abnormality that has been increasing in prevalence over the last decades. Historically, 46,XY patients with severe hypospadias and descended scrotal testes at birth have frequently lacked a genetic diagnosis. Platforms for molecular genetic testing have become more readily available and can offer an insight into underlying genetic causes of severe hypospadias. The goal of this study was to define the anatomical characteristics of severe hypospadias that can accurately define patients with 46,XY severe hypospadias and determine the practical utility of performing molecular genetic testing in this group of patients.

      Methods

      Patients who met the criteria for 46,XY severe hypospadias were offered a molecular genetic work-up in consultation with pediatric genetics. Patients were identified through chart review. Data extracted included karyotype, hypospadias phenotype including stretched penile length at diagnosis, age at genetic diagnosis, molecular genetic testing, pathogenic gene variant(s), gender identity, and clinical course. All patients underwent clinical genetic testing via 46,XY Disorders of Sexual Development (DSD) panels offered by Invitae®, GeneDx®, or Blueprint Genetics®.

      Results

      Of the 14 patients that underwent genetic testing, there were 5 previously published and 3 novel pathogenic or likely pathogenic variants in genes associated with 46,XY severe hypospadias Table . Pathogenic variants were identified in AR (3), SRD5A2 (1), NR5A1 (2), WT1 (1), and ARTX (1). Two patients had a variant of unknown significance, one in FREM2 and another in CEP41. Four had negative gene panels. The patient with the WT1 pathogenic variant was subsequently found to have developed a Wilms tumor and the patients with NR5A1 pathogenic variants are now undergoing adrenal insufficiency surveillance.
      Discussion/Conclusion: Patients with 46,XY severe hypospadias and descended testes in the scrotum at birth can benefit from molecular genetic testing as their underlying disorders may reveal pathogenic variants that could have potentially life-altering consequences and change surveillance and monitoring.

      Keywords

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      Linked Article

      • Letter to Editor - Utility of genetic work-up for 46, XY patients with severe hypospadias
        Journal of Pediatric Urology
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          It was really difficult for us to understand the context of this article, which we believe is a combination of clinical observations of hypospadias and scientific data from genetic studies [1]. The authors have included a very small number of hypospadias patients with heterogeneous anatomy, and simply classify them as “standard” and "severe" hypospadias. As per the published literature, the classification of these cases as standard, or cases with a small glans size, etc., lacks a conclusive scientific/anatomical basis.
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