Different genetic alterations underlie dual hypersensitivity of CHO mutant UV-1 to DNA methylating and cross-linking agents

CHO mutant UV-1, isolated on the basis of hypersensitivity to UV radiation (254 nm), was further characterized with respect to sensitivity to classes of DNA damaging agents in a differential cytotoxicity (DC) assay. Compared to its parental strain, Gly- A, UV-1 was dramatically (10- to 100-fold) hyp...

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Bibliographic Details
Published in:Somatic cell and molecular genetics 1985-11, Vol.11 (6), p.523-532
Main Authors: HOY, C. A, THOMPSON, L. H, SALAZAR, E. P, STEWART, S. A
Format: Article
Language:English
Subjects:
Alkylating Agents - pharmacology
Animal cells
Animals
Biological and medical sciences
Biotechnology
Cell Line
Cell Survival - drug effects
Cricetinae
Cricetulus
Cross-Linking Reagents - pharmacology
DNA - metabolism
Drug Resistance
Eukaryotic cell cultures
Female
Fundamental and applied biological sciences. Psychology
Genetic Complementation Test
Genetical aspects
Intercalating Agents - pharmacology
Methods. Procedures. Technologies
Methylation
Molecular and cellular biology
Molecular genetics
Mutagenesis. Repair
Mutation
Ovary
Structure-Activity Relationship
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Summary:CHO mutant UV-1, isolated on the basis of hypersensitivity to UV radiation (254 nm), was further characterized with respect to sensitivity to classes of DNA damaging agents in a differential cytotoxicity (DC) assay. Compared to its parental strain, Gly- A, UV-1 was dramatically (10- to 100-fold) hypersensitive to both DNA methylating and cross-linking agents. In addition, UV-1 was moderately (two- to fourfold) hypersensitive to several other classes of mutagens. DNA isolated from UV-1 or Gly- A after exposure to 14C-labeled methylnitrosourea (MNU) contained similar amounts of label, thus ruling out differences in uptake or binding. Three phenotypic revertants of UV-1 were resistant to N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) and other methylating agents but retained hypersensitivity to cross-linking agents. Moreover, fusion of UV-1 with two different UV-sensitive CHO mutants also having hypersensitivity to cross-link and methylation damage produced hybrids resistant to mitomycin C (MMC) but not to methyl methane sulfonate (MMS). Since the methylation and cross-link sensitivities were uncoupled in both genetic tests, the complex phenotype of UV-1 is likely due to more than one genetic alteration.
ISSN:0740-7750
1572-9931
DOI:10.1007/BF01534718