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Merlin G Butler1, Waheeda A Hossain1, Neil Cowen2

  • 1Department of Psychiatry and Behavioral Sciences, University of Kansas Medical Center, 3901 Rainbow Blvd., MS 4015, Kansas City, KS 66160, USA.

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|January 21, 2023
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Summary
This summary is machine-generated.

This study analyzed genetic defects in 154 Prader-Willi syndrome (PWS) patients using high-resolution microarray. The most common findings were 15q11-q13 deletions and maternal disomy 15, with some unexpected genetic disorders identified.

Keywords:
DESTINY PWSPWS molecular genetic classesPrader-Willi syndrome (PWS)atypical PWS genetic findingshigh-resolution chromosomal microarraymaternal disomy 15 subclassestypical 15q11-q13 deletion subtypes

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Area of Science:

  • Genetics
  • Molecular Biology
  • Clinical Genetics

Background:

  • Prader-Willi syndrome (PWS) is a complex genetic disorder.
  • Accurate genetic diagnosis is crucial for understanding PWS.
  • Previous studies have characterized PWS genetic defects, but larger cohorts are needed.

Purpose of the Study:

  • To determine the frequencies and types of genetic defects in a large cohort of PWS individuals.
  • To identify unexpected genetic findings and potential at-risk disorders in PWS patients.
  • To provide an unbiased estimate of genetic defect prevalence in PWS.

Main Methods:

  • High-resolution chromosome microarray analysis (CMA) was performed.
  • 154 consecutive individuals with PWS enrolled in the DESTINY PWS clinical trial were analyzed.
  • Genetic findings were categorized into deletion subtypes, maternal disomy 15, and other unexpected findings.

Main Results:

  • 87 individuals (56.5%) had 15q11-q13 deletions (Type I and Type II).
  • 62 individuals (40.3%) had non-deletion maternal disomy 15, including heterodisomy and epimutation.
  • Five individuals (3.2%) had unexpected findings, including Klinefelter syndrome and segmental isodisomy.

Conclusions:

  • High-resolution CMA is effective in characterizing genetic defects in PWS.
  • Maternal isodisomy 15 and 15q11-q13 deletions are the primary genetic causes of PWS in this cohort.
  • Unexpected genetic findings highlight the importance of comprehensive genetic analysis in PWS.