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Related Concept Videos

DNA Microarrays02:34

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Related Experiment Video

Updated: Jul 3, 2026

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
09:16

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants

Published on: February 21, 2015

Across array comparative genomic hybridization: a strategy to reduce reference channel hybridizations.

Tineke E Buffart1, Daniëlle Israeli, Marianne Tijssen

  • 1Department of Pathology, VU University Medical Center, Amsterdam, The Netherlands.

Genes, Chromosomes & Cancer
|July 30, 2008
PubMed
Summary

Across array comparative genomic hybridization (CGH) offers a more sensitive and cost-effective method for detecting chromosomal copy number aberrations (CNAs) and variations (CNVs). This approach matches or surpasses the quality of traditional dual-channel array CGH.

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Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
09:16

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Published on: February 21, 2015

Technical Demonstration of Whole Genome Array Comparative Genomic Hybridization
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Published on: November 8, 2017

Area of Science:

  • Genomics
  • Molecular Biology
  • Cancer Research

Background:

  • Array comparative genomic hybridization (array CGH) is a key technique for genome-wide analysis of chromosomal copy number aberrations (CNAs).
  • Existing methods can be resource-intensive, prompting research into more efficient approaches.

Purpose of the Study:

  • To evaluate the feasibility and effectiveness of an "across array" CGH strategy.
  • To determine if interchanging channels in dual-channel arrays enhances sensitivity and cost-effectiveness for CNA and copy number variation (CNV) profiling.

Main Methods:

  • Utilized the BT474 breast cancer cell line and a mix of normal reference DNAs hybridized on different arrays and days.
  • Assessed quality using four specific metrics, including median absolute deviation and gene amplification amplitude, comparing across array CGH to standard dual-channel array CGH.
  • Applied the across array approach to DNA from formalin-fixed paraffin-embedded tumor tissues.

Main Results:

  • Across array CGH profiles demonstrated quality comparable to or exceeding that of regular dual-channel array CGH.
  • High-quality copy number profiles were obtained from formalin-fixed paraffin-embedded tumor tissues.
  • The method successfully generated both CNA and CNV profiles.

Conclusions:

  • The across array CGH method provides a robust and efficient alternative to traditional array CGH.
  • This approach reduces redundant reference hybridizations, enabling dual sample analysis per array or simultaneous CNA/CNV profiling.
  • It offers a more cost-effective and sensitive solution for genomic copy number analysis in research and diagnostics.