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Related Concept Videos

Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...

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Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
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Array comparative genomic hybridization (aCGH) analysis in Prader-Willi syndrome.

Merlin G Butler1, William Fischer, Nataliya Kibiryeva

  • 1Children's Mercy Hospitals and Clinics and University of Missouri-Kansas City School of Medicine, Kansas City, Missouri 64108, USA. mgbutler@cmh.edu

American Journal of Medical Genetics. Part A
|February 13, 2008
PubMed
Summary

Prader-Willi syndrome (PWS) is caused by deletions in the 15q11-q13 region, with two main types (TI and TII) identified by specific breakpoints. Some PWS patients also exhibit duplications or copy number variations in other chromosomal regions.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Human Disease

Background:

  • Prader-Willi syndrome (PWS) results from the loss of paternally expressed genes in the 15q11-q13 chromosomal region.
  • PWS deletions typically occur at one of two breakpoints within large duplicons, defining distinct deletion subgroups.

Purpose of the Study:

  • To characterize the specific deletion breakpoints and sizes in Prader-Willi syndrome.
  • To investigate additional genetic variations, such as duplications and copy number variations (CNVs), in PWS patients.

Main Methods:

  • High-resolution array comparative genomic hybridization (aCGH) was employed to precisely map deletion breakpoints (BP1, BP2, BP3) and determine deletion sizes.
  • Analysis included identification of specific genes/transcripts affected by deletions and assessment of CNVs in other genomic regions.

Main Results:

  • Two primary deletion types, Type I (TI) and Type II (TII), were identified based on breakpoints BP1 and BP2, respectively, with distinct mean deletion sizes (TI: 6.583 Mb, TII: 5.330 Mb).
  • A subset of TI deletions involved larger regions, encompassing additional genes. Four PWS subjects presented with duplications of the 15q11 region alongside deletions.
  • Most PWS subjects displayed copy number variations (CNVs) of ≥50 kb in other chromosomal regions, notably deletions and duplications on chromosomes 8p and 3q.

Conclusions:

  • The study refines the classification of PWS deletions based on precise breakpoint mapping and size determination.
  • The findings highlight the genetic heterogeneity in PWS, including the presence of duplications and CNVs in other genomic loci, which may contribute to the syndrome's complex phenotype.