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Related Concept Videos

Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...

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Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
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High-resolution array CGH clarifies events occurring on 8p in carcinogenesis.

Susanna L Cooke1, Jessica C M Pole, Suet-Feung Chin

  • 1Department of Pathology and Hutchison/MRC Research Centre, University of Cambridge, Cambridge, UK. susanna.cooke@cancer.org.uk

BMC Cancer
|October 9, 2008
PubMed
Summary

Chromosome 8 short arm (8p) rearrangements are common in epithelial cancers. This study identified novel amplicon and candidate tumor suppressor gene ARHGEF10 in 8p21.3, offering new insights into cancer development.

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Area of Science:

  • Genomics
  • Cancer Genetics
  • Molecular Biology

Background:

  • Chromosome 8 short arm (8p) rearrangements, particularly at 8p12, are frequent in epithelial cancers like breast cancer.
  • While 8p11-12 rearrangements are studied, the initial 30 Mb of 8p, containing potential tumor suppressor genes, remain less characterized.

Purpose of the Study:

  • To comprehensively analyze rearrangements across the entire 8p region in cancer cell lines and primary tumors.
  • To identify novel candidate tumor suppressor genes and regions of recurrent copy number alterations on 8p.

Main Methods:

  • Array comparative genomic hybridization (array CGH) at high resolution using tiling-path BACs was performed on 32 breast and 6 pancreatic cancer cell lines.
  • Regions of recurrent rearrangement were further investigated using fosmid arrays, fluorescence in situ hybridization (FISH), and quantitative reverse transcription PCR (RT-PCR).

Main Results:

  • Confirmed widespread loss of 8p up to 30 Mb, with focal losses and copy number steps observed in some cases.
  • Identified three regions with recurrent rearrangements: two distinct deletions and one novel amplicon within 8p21.3 (19.1 Mb - 23.4 Mb).
  • Found deletions affecting ARHGEF10 in 8p23.3 and TUSC3 in 8p22, with ARHGEF10 showing a point mutation in one cell line.

Conclusions:

  • The observed 8p rearrangements may result from the high density of target genes on this chromosome arm.
  • ARHGEF10 is proposed as a novel candidate tumor suppressor gene, warranting further investigation in cancer development.