engleski

Specific detection of cyclobutane pyrimidine dimers in phytoplankton DNA by a non-radioactive assay based on T4-endonuclease V digestion

The effect of artificial and natural UV irradiation on DNA in marine phytoplankton Isochrysis galbana monoculture was investigated. The presence of cyclobutane pyrimidine dimers (CPDs) in unlabelled I. galbana DNA was detected by a nonradiometric alkaline filter elution assay after T4-endonuclease V digestion. The quantity of CPDs was estimated by alkaline agarose gel electrophoresis. Precise determination of the amount of DNA in the presence of I. galbana pigments was achieved by oxazole yellow homodimer (YOYO) dye.T4-endonuclease V - sensitive sites frequency (ESS/kb), measured after exposure to 2 - 40 kJm-2 of artificial UV light, increased in a dose-dependent manner. Twelve hours after irradiation cell culture growth was disrupted, and 50% of initial DNA damage in the cells was observed. After one hour of sunlight exposure incidence of CPDs increase significantly. Prolonged exposition to sunlight decrease CPDs incidence due to efficiency of I. galbana DNA repair mechanisms. Presence of water soluble crude oil fraction (WSOF) affect DNA repair efficiency resulting in accumulation of CPDs in I. galbana DNA.

Alkaline filter elution; crude oil; DNA damage; phytoplankton; UV; sunlight

nije evidentirano