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Related Experiment Videos

Yeast artificial chromosome cloning

M Ramsay1

  • 1Department of Human Genetics, School of Pathology, South African Institute for Medical Research, Johannesburg.

Molecular Biotechnology
|April 1, 1994
PubMed
Summary
This summary is machine-generated.

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Yeast artificial chromosomes (YACs) clone large DNA fragments, enabling detailed study of genes and their functions. These YACs remain stable in yeast and can be expressed in mammalian cells for further research.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Conventional cloning vectors have limited DNA insert sizes (plasmids: 10 kb, bacteriophage: 15 kb, cosmids: 50 kb).
  • Large genes or gene complexes often exceed these size limitations, hindering comprehensive study.
  • Prokaryotic cloning systems can lead to instability or loss of certain DNA sequences.

Purpose of the Study:

  • To highlight the utility of Yeast Artificial Chromosome (YAC) cloning systems for large DNA fragment cloning.
  • To emphasize the advantages of YACs over conventional vectors for studying complex genetic regions.
  • To demonstrate the functional expression of cloned mammalian genes in mammalian cells via YACs.

Main Methods:

  • Utilizing Yeast Artificial Chromosome (YAC) technology for cloning DNA inserts ranging from 50 kb to over 2000 kb.

Related Experiment Videos

  • Performing restriction mapping of YACs to generate physical maps.
  • Examining YACs for the presence of coding sequences and genes.
  • Reintroducing intact YACs into mammalian cells for gene expression studies.

    • Main Results:

    • YACs successfully clone large DNA stretches (50-2000+ kb), accommodating complete large genes or gene complexes.
    • DNA sequences unstable in prokaryotic systems are maintained stably in YAC clones within yeast.
    • Introduced mammalian genes on YACs are expressed in mammalian cells, allowing functional analysis within their native genomic context.

    Conclusions:

    • YAC cloning systems are essential for studying large, complex DNA regions that are intractable with conventional vectors.
    • The stability of DNA inserts in yeast and the ability to express them in mammalian cells make YACs a powerful tool in genetic research.
    • YACs facilitate the investigation of gene function by preserving genomic context and enabling proper protein processing in eukaryotic systems.