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Related Experiment Videos

A new method for detecting pericentric inversions using COD-FISH

S M Bailey1, J Meyne, M N Cornforth

  • 1Life Sciences Division, Los Alamos National Laboratory, NM 87545, USA. bailey@telomere.lanl.gov

Cytogenetics and Cell Genetics
|January 1, 1996
PubMed
Summary
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Chromosome orientation and direction fluorescence in situ hybridization (COD-FISH) offers a novel method for detecting chromosomal inversions. This strand-specific technique identifies inversions by observing a switch in probe signals between chromatids.

Area of Science:

  • Cytogenetics
  • Molecular Biology
  • Genetics

Background:

  • Chromosomal inversions are structural rearrangements that can impact gene function and organismal health.
  • Conventional cytogenetic methods like chromosome banding have limitations in precisely detecting and characterizing inversions.
  • Fluorescence in situ hybridization (FISH) is a powerful tool for visualizing DNA sequences on chromosomes.

Purpose of the Study:

  • To introduce and evaluate a novel strand-specific FISH technique, termed chromosome orientation and direction FISH (COD-FISH), for detecting chromosomal inversions.
  • To assess the utility of COD-FISH in identifying pericentric inversions in specific human chromosomes.
  • To compare the information provided by COD-FISH with conventional cytogenetic analysis methods.

Main Methods:

Related Experiment Videos

  • Development and application of COD-FISH, a modification of FISH that utilizes single-stranded probes for strand-specific hybridization.
  • Determination of the absolute 5 o3' direction of DNA target sequences relative to chromosome arm orientation.
  • Analysis of pericentric inversions in chromosomes 1, 8, 10, and X using COD-FISH, with comparison to prior chromosome banding data.

Main Results:

  • COD-FISH successfully detected pericentric inversions in chromosomes 1, 8, 10, and X.
  • The technique identified inversions by observing a characteristic 'switch' in probe signal location between chromatids.
  • COD-FISH provided additional, valuable information for inversion detection in certain cases, surpassing conventional methods.

Conclusions:

  • COD-FISH is a viable and effective technique for the detection of chromosomal inversions, particularly pericentric inversions.
  • This strand-specific FISH approach offers enhanced precision and can reveal details not discernible through traditional cytogenetic analyses.
  • Further discussion addresses the practical considerations and limitations associated with the COD-FISH technique.