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Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
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Published on: February 21, 2015

Analysis of wilms tumors using SNP mapping array-based comparative genomic hybridization.

Lesleyann Hawthorn1, John K Cowell

  • 1School of Medicine, MCG Cancer Center, Medical College of Georgia, Augusta, Georgia, United States of America. lhawthorn@mcg.edu

Plos One
|May 6, 2011
PubMed
Summary

This study analyzed genetic alterations in 56 Wilms tumors (WT), revealing consistent chromosomal deletions and gains. These findings provide insights into the genetic landscape of WT and its relationship with tumor stage.

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Area of Science:

  • Genetics
  • Oncology
  • Developmental Biology

Background:

  • Wilms tumor (WT) is a pediatric kidney cancer crucial for studying kidney development and tumorigenesis.
  • While some WT cases are linked to hereditary cancer predisposition syndromes, most occur sporadically.
  • Understanding the genetic underpinnings of sporadic WT is essential for improving diagnosis and treatment.

Purpose of the Study:

  • To comprehensively analyze copy number alterations (CNAs) and loss of heterozygosity (LOH) in a cohort of 56 Wilms tumors.
  • To identify specific chromosomal regions frequently affected by deletions and gains in WT.
  • To correlate genetic changes with tumor stage and potentially uncover stage-specific genomic profiles.

Main Methods:

  • Utilized high-resolution oligonucleotide arrays (SNP mapping arrays) for detailed genomic analysis.
  • Assessed copy number changes and loss of heterozygosity across the genome in 56 Wilms tumor samples.
  • Analyzed genomic data in relation to tumor stage (stages 1-5).

Main Results:

  • Identified consistent deletions on chromosomes 1p, 4q, 7p, 9q, 11p, 11q, 14q, 16q, and 21q.
  • Observed high-frequency gains on chromosome 1q, with lower frequency gains on 7q, 8, 12, and 18.
  • Demonstrated that early-stage (stage 1) tumors exhibit more stable karyotypes compared to advanced-stage tumors (stages 3-5), which show more complex aCGH profiles.

Conclusions:

  • The study delineates a detailed map of genetic alterations in sporadic Wilms tumors.
  • Specific chromosomal regions are recurrently affected, suggesting their potential role in WT development.
  • Genomic complexity increases with tumor stage, indicating a potential role for chromosomal instability in WT progression.