Analysis of genomic aberrations using comparative genomic hybridization of metaphase chromosomes

Melanie A. Carless

Research output: Chapter in Book/Report/Conference proceedingChapter


Comparative genomic hybridization (CGH) allows the global screening of copy number aberrations within a sample. Specifically, large (>20 mb) deletions and amplifications are detected, based on utilization of test and reference (karyotypically normal) DNA. These samples are whole-genome amplified by DOPPCR and then differentially labeled with fluorophores via nick translation. Test and reference samples are competitively hybridized to normal metaphase chromosomes. The relative amount of each DNA that binds to a chromosomal locus is indicative of the abundance of that DNA. Thus, if a chromosomal region is amplified, the test DNA will out-compete the reference DNA for binding and fluorescence will indicate amplification. Conversely, if a region is deleted, more reference DNA will bind and fluorescence will indicate a deletion. The following chapter outlines the protocols used for CGH analysis of metaphase chromosomes. These protocols include metaphase chromosome slide preparation, DNA extraction (from blood, cell lines, and microdissected formalin-fixed paraffin-embedded tissue), DOP-PCR, nick translation, in situ hybridization, and fluorescence microscopy and image analysis.

Original languageEnglish (US)
Title of host publicationChromatin Protocols: Third Edition
PublisherSpringer New York
Number of pages28
ISBN (Print)9781493924745, 9781493924738
StatePublished - Mar 31 2015
Externally publishedYes


  • Comparative genomic hybridization (CGH)
  • Copy number aberrations (CNAs)
  • Degenerate oligonucleotide primed-polymerase chain reaction (DOP-PCR)
  • Fluorescence microscopy
  • Microdissection
  • Nick translation

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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