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Genomics Precision Diagnostic > Endocrinology > Disorders of Sex Development

Disorders of Sex Development

Disorders of Sex Development (DSD), formerly termed intersex conditions, occur when there is a discrepancy between the appearance of the genitalia and the genetic makeup of an individual.
Overview
Indication
Clinical Utility
Genes & Diseases
Methodology
References

Overview

  • Disorders of Sex Development (DSD), formerly termed intersex conditions, occur when there is a discrepancy between the appearance of the genitalia and the genetic makeup of an individual.

  • These disorders can present from birth to adolescence. DSD can be mild or significant depending on the appearance of the genitalia and associated symptoms. DSD can be caused by changes at a chromosomal level and gene level thus the inheritance pattern of DSDs can be dominant, recessive or sex-linked. Additionally, DSDs can occur due to de novo changes in the DNA (for the first time in the affected individual). 

  • The Igenomix Disorders of Sex Development Precision Panel can be used to make a directed and accurate differential diagnosis of ambiguous genitalia ultimately leading to a better management and prognosis of the disease. It provides a comprehensive analysis of the genes involved in this disease using next-generation sequencing (NGS) to fully understand the spectrum of relevant genes involved.  

Indication

The Igenomix Disorders of Sex Development Precision Panel is indicated for those patients with clinical suspicion of an intersex condition presenting with the following manifestations: 

  • Family history of genital ambiguity  
  • History of early death of infants 
  • Maternal drug ingestion 
  • Ambiguous genitalia  
  • Abnormal size and degree of differentiation of phallus  
  • Abnormal position of urethral meatus  
  • Separated labioscrotal folds  
  • Labioscrotal folds with increased pigmentation  

Clinical Utility

The clinical utility of this panel is: 

  • The genetic and molecular confirmation for an accurate clinical diagnosis of a symptomatic patient.  
  • Early initiation of treatment with a multidisciplinary team for early surgical reconstruction, psychosocial aids and pharmacologic treatment. 
  • Risk assessment of asymptomatic family members according to the mode of inheritance. 

Genes & Diseases

Methodology

References

See scientific referrals

Witchel S. F. (2018). Disorders of sex development. Best practice & research. Clinical obstetrics & gynaecology, 48, 90–102. https://doi.org/10.1016/j.bpobgyn.2017.11.005  

Lee, P. A., Nordenström, A., Houk, C. P., Ahmed, S. F., Auchus, R., Baratz, A., Baratz Dalke, K., Liao, L. M., Lin-Su, K., Looijenga, L. H., 3rd, Mazur, T., Meyer-Bahlburg, H. F., Mouriquand, P., Quigley, C. A., Sandberg, D. E., Vilain, E., Witchel, S., & Global DSD Update Consortium (2016). Global Disorders of Sex Development Update since 2006: Perceptions, Approach and Care. Hormone research in paediatrics, 85(3), 158–180. https://doi.org/10.1159/000442975 

Houk, C., & Lee, P. (2012). Update on disorders of sex development. Current Opinion In Endocrinology & Diabetes And Obesity, 19(1), 28-32. doi: 10.1097/med.0b013e32834edacb 

Hughes, I., Houk, C., Ahmed, S., & Lee, P. (2006). Consensus statement on management of intersex disorders. Journal Of Pediatric Urology, 2(3), 148-162. doi: 10.1016/j.jpurol.2006.03.004 

Yatsenko, S. A., & Witchel, S. F. (2017). Genetic approach to ambiguous genitalia and disorders of sex development: What clinicians need to know. Seminars in perinatology, 41(4), 232–243. https://doi.org/10.1053/j.semperi.2017.03.016 

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