mitosis & nuclear chromosome
Exposure of mus207A1 mutant larvae to DDVP for 48 hours results in a significant increase in the migration of DNA in midgut cells at 1.5 and 15ng/ml concentrations of DDVP as compared to controls.
The formation of mobile nucleoli is enhanced in these post-replicative repair mutants.
Defect in a cell cycle checkpoint so that cells with damaged DNA (for example by X ray) are allowed to enter mitotic metaphase.
Reduces meiotic exchange.
Homozygotes and hemizygotes show a higher frequency of spontaneous chromosome aberrations in neuroblast metaphases than wild-type larvae. The ratio of chromatid breaks to isochromatid breaks is 1.5-1.6. Approximately half of the breaks are heterochromatic and half are euchromatic. The breaks appear to be randomly distributed among the chromosomes. Breaks are 1.4-1.6 times more frequent in females than in males.
Strongly reduces meiotic exchange.