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Related Experiment Videos

UV hypersensitivity of yeast linear plasmids

N Gunge1, S Takahashi, K Fukuda

  • 1Applied Microbial Technology, Kumamoto Institute of Technology, Japan.

Current Genetics
|October 1, 1994
PubMed
Summary

UV irradiation efficiently cured Kluyveromyces linear plasmids. Cytoplasmic plasmids, unlike nuclear ones, showed UV hypersensitivity, suggesting defects in DNA repair or replication. This impacts yeast plasmid research.

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Area of Science:

  • Yeast genetics
  • Molecular biology
  • DNA repair mechanisms

Background:

  • Kluyveromyces linear plasmids pGKL1 and pGKL2 confer killer activity.
  • Cytoplasmic linear plasmids are crucial for various yeast functions.
  • Understanding plasmid stability under stress is vital for genetic manipulation.

Purpose of the Study:

  • To investigate the UV hypersensitivity of terminal protein (TP)-associated cytoplasmic linear plasmids.
  • To compare the UV response of cytoplasmic plasmids with nuclear plasmids in yeast.
  • To elucidate the role of DNA repair pathways in plasmid stability.

Main Methods:

  • UV irradiation of yeast strains carrying different plasmids (cytoplasmic and nuclear).
  • Utilizing strains with functional and deficient DNA repair pathways (e.g., rad4).

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  • Assessing plasmid curing and DNA damage repair mechanisms (photoreactivation and excision repair).

    • Main Results:

    • Cytoplasmic linear plasmids (pJKL1, pRKL2) exhibited significant UV hypersensitivity compared to nuclear plasmids (pLS1, YCp121).
    • Both cytoplasmic and nuclear plasmids were repaired by photoreactivation and excision repair pathways.
    • UV hypersensitivity of cytoplasmic plasmids was not solely due to the major DNA repair systems.

    Conclusions:

    • The UV hypersensitivity of yeast cytoplasmic plasmids is specific and likely stems from factors beyond standard DNA repair.
    • Potential causes include defects in alternative repair systems or the TP-primed replication process.
    • TP-associated linear plasmids in other yeast species may also be UV sensitive.