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Delayed Puberty Due to a WDR11 Truncation at Its N-Terminal Domain Leading to a Mild Form of Ciliopathy Presenting With Dissociated Central Hypogonadism: Case Report

Authors
  • Castro, Sebastián1
  • Brunello, Franco G.1, 2
  • Sansó, Gabriela1, 3
  • Scaglia, Paula1, 3
  • Esnaola Azcoiti, María1, 3
  • Izquierdo, Agustín1, 3
  • Villegas, Florencia4
  • Bergadá, Ignacio1
  • Ropelato, María Gabriela1, 3
  • Martí, Marcelo A.2
  • Rey, Rodolfo A.1, 3, 5
  • Grinspon, Romina P.1
  • 1 Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CEDIE), CONICET – FEI – División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Buenos Aires , (Argentina)
  • 2 Departamento de Química Biológica, Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN) CONICET, Ciudad Universitaria, Buenos Aires , (Argentina)
  • 3 Unidad de Medicina Traslacional, Hospital de Niños Ricardo Gutiérrez, Buenos Aires , (Argentina)
  • 4 Servicio de Genética, Hospital de Niños Ricardo Gutiérrez, Buenos Aires , (Argentina)
  • 5 Departamento de Biología Celular, Histología, Facultad de Medicina, Universidad de Buenos Aires, Embriología y Genética, Buenos Aires , (Argentina)
Type
Published Article
Journal
Frontiers in Pediatrics
Publisher
Frontiers Media SA
Publication Date
Jun 03, 2022
Volume
10
Identifiers
DOI: 10.3389/fped.2022.887658
Source
Frontiers
Keywords
Disciplines
  • Pediatrics
  • Case Report
License
Green

Abstract

Pubertal delay in males is frequently due to constitutional delay of growth and puberty, but pathologic hypogonadism should be considered. After general illnesses and primary testicular failure are ruled out, the main differential diagnosis is central (or hypogonadotropic) hypogonadism, resulting from a defective function of the gonadotropin-releasing hormone (GnRH)/gonadotropin axis. Ciliopathies arising from defects in non-motile cilia are responsible for developmental disorders affecting the sense organs and the reproductive system. WDR11-mediated signaling in non-motile cilia is critical for fetal development of GnRH neurons. Only missense variants of WDR11 have been reported to date in patients with central hypogonadism, suggesting that nonsense variants could lead to more complex phenotypes. We report the case of a male patient presenting with delayed puberty due to Kallmann syndrome (central hypogonadism associated with hyposmia) in whom the next-generation sequencing analysis identified a novel heterozygous base duplication, leading to a frameshift and a stop codon in the N-terminal region of WDR11. The variant was predicted to undergo nonsense-mediated decay and classified as probably pathogenic following the American College of Medical Genetics and Genomics (ACMG) criteria. This is the first report of a variant in the WDR11 N-terminal region predicted to lead to complete expression loss that, contrary to expectations, led to a mild form of ciliopathy resulting in isolated Kallmann syndrome.

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