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Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
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Telomere Dysfunction in Pediatric Patients with Differences/Disorders of Sexual Development.

Haifaou Younoussa1,2, Macoura Gadji2, Mamadou Soumboundou3

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|March 28, 2024
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Summary

This study links telomere dysfunction to Disorders of Sex Development (DSDs) in Senegalese children. Shorter telomeres and telomere aberrations were observed in DSD patients, suggesting a role in DSD development.

Keywords:
DSDschromosomal aberrationstelomere dysfunctionstelomere shortening

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Area of Science:

  • Genetics and Molecular Biology
  • Developmental Biology
  • Human Genetics

Background:

  • Disorders of Sex Development (DSDs) are complex conditions affecting sexual development, with increasing incidence in sub-Saharan Africa.
  • The underlying causes and mechanisms of DSDs remain poorly understood, necessitating further investigation.
  • Telomere dysfunction has emerged as a potential factor in various genetic disorders.

Purpose of the Study:

  • To investigate the cytogenetic profiles of Disorders of Sex Development (DSD) patients in Senegal.
  • To explore the potential role of telomere dysfunction in the etiology of DSDs.
  • To establish a correlation between telomere length, telomere aberrations, and chromosomal abnormalities in DSD patients.

Main Methods:

  • Retrospective analysis of peripheral blood lymphocytes from 35 DSD patients and 150 healthy controls.
  • Conventional cytogenetics, telomere, and centromere staining.
  • Multiplex fluorescence in situ hybridization (FISH) with SRY-specific probes.

Main Results:

  • Cytogenetic analysis revealed normal karyotypes in most patients, but identified structural chromosome aberrations in 22%.
  • DSD patients exhibited significantly reduced mean telomere lengths compared to healthy controls.
  • Telomere analysis indicated an increased rate of telomere aberrations, including telomere loss and doublets, in DSD patients.

Conclusions:

  • This study provides the first evidence correlating telomere dysfunction with Disorders of Sex Development (DSDs).
  • Telomere dysfunction may be linked to DSD pathogenesis through mechanisms like DNA repair deficiencies or specific gene mutations.
  • Telomere analysis is recommended for prenatal diagnostics and the evaluation of diagnosed genetic DSD disorders.