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Related Experiment Videos

Sequential cloning by a vector walking along the chromosome.

S A Lacks1, B Greenberg

  • 1Biology Department, Brookhaven National Laboratory, Upton, NY 11973.

Gene
|July 31, 1991
PubMed
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A novel sequential DNA cloning method uses cyclical plasmid integration and excision for efficient chromosomal segment cloning. This technique advances genetic research by enabling precise, stepwise DNA mapping in various organisms.

Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Chromosomal DNA cloning is essential for genetic analysis.
  • Existing methods can be inefficient for large-scale or sequential cloning projects.

Purpose of the Study:

  • To develop a novel procedure for sequential cloning of chromosomal DNA.
  • To enable stepwise cloning of overlapping DNA segments using a plasmid vector.

Main Methods:

  • Cyclical integration and excision of a plasmid vector into the host chromosome.
  • Utilizing specific restriction enzyme sites for vector excision and plasmid reduction.
  • Constructing a pBR322-based vector with chloramphenicol resistance for broad-species expression.

Main Results:

Related Experiment Videos

  • Demonstrated sequential cloning in Streptococcus pneumoniae, extending a maltosaccharide utilization gene region by 8 kb over three cycles.
  • Confirmed accuracy through DNA hybridization with chromosomal restriction fragments.
  • Developed a versatile cloning vector for Escherichia coli with broad-species applicability.

Conclusions:

  • The devised method allows accurate, sequential cloning of chromosomal DNA segments.
  • The technique is adaptable for cloning yeast and mammalian DNA in artificial chromosomes, owing to conserved genetic processes.