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Related Experiment Videos

Sequence scanning: A method for rapid sequence acquisition from large-fragment DNA clones

D I Nurminsky1, D L Hartl

  • 1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 20, 1996
PubMed
Summary

Sequence scanning rapidly acquires clone sequences using LambdaScan vectors and PCR. This method generates high-resolution physical maps for genomic analysis and gene identification.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Large DNA clones like bacteriophage P1 clones, cosmids, and yeast artificial chromosomes are crucial for genome sequencing.
  • Efficiently obtaining sequence information from these large clones presents a significant challenge in genomics.

Purpose of the Study:

  • To introduce a novel strategy, "sequence scanning," for the rapid acquisition of sequence data from large DNA clones.
  • To develop a method that generates high-resolution physical maps for genomic analysis.

Main Methods:

  • Utilizing a specialized vector, LambdaScan, to generate subclones with inserts in the 8-12 kb range.
  • Randomly selecting and sequencing ends of subclones using vector-specific primers.
  • Employing long-range spectrum PCR to order and orient the sequenced subclones.

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Main Results:

  • The combination of shotgun and directed sequencing provides a high-resolution physical map.
  • Computer simulations show that scanning 192 subclones yields a favorable ratio of double-stranded to single-stranded sequence and gaps.
  • Increased sequencing read length significantly improves the proportion of double-stranded sequence coverage.

Conclusions:

  • Sequence scanning offers an efficient approach for rapid clone sequencing and physical map construction.
  • The generated physical maps are valuable for identifying coding regions and comparing genome organization.
  • This strategy enhances the feasibility of large-scale genomic sequencing projects.