Download Advances in Genetics, Vol. 23 by E.W. Caspari, John G. Scandalios (Eds.) PDF

By E.W. Caspari, John G. Scandalios (Eds.)

This quantity in a sequence on genetics, emphasizes the variety of genetic reports. Articles conceal the filamentous fungus neurospora, biogenesis of yeast ribosomes, evolutionary genetics of fish, drosophila transposable components and the dropophila gene zeste.

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Caffeine then alters incision rate, rejoining, and DNA synthesis rates. Its potentiation of killing in cells and organisms in which DNA 40 J. PHIPPS et al. has been damaged by various agents is likely to reflect the operation of the major repair process(es) involved under the given circumstances. In S. pombe, in which excision is not the major route for repair of ionizing radiation-induced DNA injuries, caffeine selectively alters the repair mechanisms operating when two DNA copies are available, a t either a pre- or post-replicative stage.

The mutated strand generates a mutant colony with the other strand suffering lethal damage and producing nonviable progeny. The independence of mutational and lethal damage had, however, been demonstrated earlier by Nasim and Saunders (1968). Abbondandolo and Simi (1971) suggested that the lethal sectoring hypothesis would be relevant at high levels of killing but a repair mechanism would be active at high survival rates. RECOVERY AND REPAIR IN Schizosaccharomyces 47 The contribution of lethal sectoring was ruled out, for UV a t least, by Hannan et al.

Suggestions had been made by Fabre (1972a) and further reinforced by Nasim and Smith (1974) that caffeine may block more than one repair pathway. Reservations were then raised by GrossenbacherGrunder and Thuriaux (1981) about the recombinational nature of the caffeine-sensitive pathways in S. pombe, based on their results that, except for rad 1-1,mitotic and meiotic recombinational rates and frequencies of the caffeine-insensitive strains were not strikingly reduced compared to the wild-type and caffeine-sensitive ones (Table 2).

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