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Cancers Originate from Somatic Mutations in a Single Cell02:21

Cancers Originate from Somatic Mutations in a Single Cell

Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
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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

Increasing genomic instability during premalignant neoplastic progression revealed through high resolution array-CGH.

Lisa A Lai1, Thomas G Paulson, Xiaohong Li

  • 1Department of Pathology, University of Washington, Seattle, WA 98195, USA.

Genes, Chromosomes & Cancer
|March 3, 2007
PubMed
Summary

Chromosomal instability worsens during cancer progression in Barrett's esophagus. Genomic alterations evolve from small changes to larger copy number events, indicating increasing severity and distinct clonal dynamics in pre-malignant tissue.

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Area of Science:

  • Oncology
  • Genetics
  • Genomics

Background:

  • Chromosomal instability is a key driver of neoplastic progression and cancer development.
  • Barrett's esophagus is a pre-malignant condition with an increased risk of esophageal adenocarcinoma.

Purpose of the Study:

  • To evaluate the progression of chromosomal instability in Barrett's esophagus tissue across distinct molecular stages.
  • To understand the evolution of genomic alterations and clonal dynamics during neoplastic progression.

Main Methods:

  • Utilized high-resolution Affymetrix 100K SNP arrays to analyze DNA from Barrett's esophagus tissue samples.
  • Compared genomic profiles across three molecular stages: CDKN2A loss of heterozygosity (LOH) only, CDKN2A(LOH)/TP53(LOH), and CDKN2A(LOH)/TP53(LOH) with aneuploidy.

Main Results:

  • Observed increases in the number and size of regions with LOH or copy number changes within individuals over time.
  • Found a strong correlation between copy loss and LOH in advanced disease stages, unlike earlier stages.
  • Identified distinct patterns of clonal evolution within Barrett's esophagus segments.

Conclusions:

  • Genomic instability increases in severity and changes character during neoplastic progression in Barrett's esophagus.
  • Pre-malignant disease exhibits significant instability and clonal dynamics, evolving from small alterations to larger copy changes associated with mitotic instability.