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Related Experiment Videos

Mechanically stretched chromosomes as targets for high-resolution FISH mapping

M Laan1, O P Kallioniemi, E Hellsten

  • 1Department of Clinical Chemistry, University of Helsinki, Finland.

Genome Research
|August 1, 1995
PubMed
Summary

Mechanically stretched chromosomes significantly enhance mapping resolution in fluorescence in situ hybridization (FISH), enabling precise gene localization. This technique offers a 10-fold improvement over conventional FISH for genetic mapping.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cytogenetics

Background:

  • Fluorescence in situ hybridization (FISH) typically maps probes to chromosome bands.
  • Conventional FISH establishes probe order for distances greater than or equal to 2-3 Mb.
  • Higher resolution mapping techniques are needed for smaller genomic distances.

Purpose of the Study:

  • To evaluate mechanically stretched chromosomes as targets for increased mapping resolution in FISH.
  • To determine the mapping resolution achievable with stretched chromosome FISH.
  • To demonstrate the utility of this technique for gene mapping.

Main Methods:

  • Mechanically stretching chromosomes to serve as hybridization targets.
  • Performing pair-wise hybridizations with probes from the 1p32-p33 region.

Related Experiment Videos

  • Comparing mapping resolution with conventional metaphase FISH.

    • Main Results:

    • Probes separated by greater than or equal to 170 kb could be ordered relative to each other and the chromosome axis.
    • Mapping resolution was increased up to 10-fold compared to conventional metaphase FISH.
    • The TIE gene was localized centromeric to COL9A2, RLF, and L-MYC genes at 1p32.

    Conclusions:

    • Mechanically stretched chromosomes provide a simple, high-resolution FISH method.
    • This technique bridges the resolution gap between metaphase and ultra-high-resolution mapping.
    • It allows for accurate gene order determination at kb-level resolution.