title: An in vitro approach to study chromosomal DNA damage.
abstract: In this study a simple electrophoresis approach has been proposed for assessing DNA damage per chromosome in vitro. Novel procedures of gel casting, sample loading, electrophoresis and quantification of damage have been suggested. Sets of Saccharomyces cerevisiae chromosomes subjected to DNA damage by Bleomycin, Co60-gamma-radiation alone and in combination with Hoechst were studied in detail. Statistical analyses showed that damage induced by Bleomycin bore linear positive correlation with %GA (r = 0.97) and %GT (r = 0.61) contents of chromosomes. Samples pre-treated with Hoechst showed much less damage by Co60-gamma-irradiation as compared to samples not treated with Hoechst but exposed to Co60-gamma-irradiation. The 'protective effect of Hoechst' bore linear positive correlation (r = 0.8) with %TAT content of chromosomes.
authors.affiliation: Department of Molecular Radiation Biology, Institute of Nuclear Medicine and Allied Sciences, Delhi, India. balainma44@hotmail.com
authors.forename: M
authors.initials: M
authors.lastname: Bala
authors.forename: L
authors.initials: L
authors.lastname: Mathew
mesh_terms: D001761:Bleomycin / Q000494:pharmacology; D015825:Chromosomes, Fungal / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects*; D004249:DNA Damage / Q000187:drug effects* / Q000528:radiation effects*; D004271:DNA, Fungal / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D004305:Dose-Response Relationship, Drug; D004307:Dose-Response Relationship, Radiation; D004587:Electrophoresis, Agar Gel / Q000379:methods*; D015180:Electrophoresis, Gel, Two-Dimensional; D005720:Gamma Rays; D012441:Saccharomyces cerevisiae / Q000235:genetics
chemical_list: D004271:DNA, Fungal; D001761:Bleomycin