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ENHANCEMENT OF ULTRAVIOLET‐DNA REPAIR IN den V GENE TRANSFECTANTS and T4 ENDONUCLEASE V‐LIPOSOME RECIPIENTS
Author(s) -
Kibitel Jeannie Tsimis,
Yee Vivian,
Yarosh Daniel B.
Publication year - 1991
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1991.tb02086.x
Subject(s) - xeroderma pigmentosum , transfection , pyrimidine dimer , microbiology and biotechnology , endonuclease , dna repair , biology , dna , nucleotide excision repair , gene , chemistry , biochemistry
The phage T4 deri V gene, coding for the pyrimidine‐dimer specific T4 endonuclease V, was transfected into human repair‐proficient fibroblasts, repair‐deficient xeroderma pigmentosum fibroblasts, and into wild type CHO hamster cells. Transfectants maintained den V DNA and expressed deri V raRNA. Purified T4 endonuclease V encapsulated in liposomes was also used to treat repair‐proficient and ‐deficient human cells. The den V transfected clones and liposome‐treated cells showed increased unscheduled DNA synthesis and enhanced removal of pyrimidine dimers compared to controls. Both den V gene transfection and endonuclease V liposome treatment enhanced post‐UV survival in xeroderma pigmentosum cells but had no effect on survival in repair‐proficient human or hamster cells. The results demonstrate that an exogenous DNA repair enzyme can correct the DNA repair defect in xeroderma pigmentosum cells and enhance DNA repair in normal cells.