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Quantitative DNA fiber mapping

H U Weier1, M Wang, J C Mullikin

  • 1Center for Molecular Cytogenetics, University of California, Lawrence Berkeley Laboratory, Berkeley 94720, USA.

Human Molecular Genetics
|October 1, 1995
PubMed
Summary
This summary is machine-generated.

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We developed a new DNA fiber mapping technique for precise clone overlap determination. This method aids in constructing accurate physical maps for genomes, improving contig assembly and gene mapping.

Area of Science:

  • Genomics
  • Molecular Biology
  • Biophysics

Background:

  • Accurate physical mapping of genomes is crucial for sequence assembly and contig construction.
  • Current methods like clone fingerprinting and end sequencing have limitations in precision and orientation determination.

Purpose of the Study:

  • To present a complementary technique for mapping cloned DNA sequences onto individual stretched DNA molecules.
  • To enable direct visualization and precise mapping of clone overlaps and orientation.

Main Methods:

  • Utilizing hydrodynamic force from a receding meniscus to stretch high molecular weight DNA molecules into linear templates.
  • Employing in situ hybridization to map cloned probes onto these linear DNA templates.
  • Quantitative DNA fiber mapping for high-resolution analysis.

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Main Results:

  • Demonstrated mapping of lambda DNA restriction fragments with ~1 kb precision.
  • Successfully localized overlap between cosmid and P1 clones.
  • Mapped P1 clones on a YAC with ~5 kb precision and estimated a ~25 kb gap.

Conclusions:

  • Quantitative DNA fiber mapping offers a high-density, reproducible method for physical mapping.
  • The technique provides clone orientation and direct visualization of DNA repeats.
  • This approach significantly enhances the accuracy of genome physical map construction.