Relationship between repair processes and mutation induction in bacteria

Expression of cloned bacteriophage T4 uvsW and uvsY genes in rec+ and rec- Escherichia coli

Chimeric plasmids containing the uvsY uvsW region of the T4 genome were examined for the expression of these genes. Certain of these plasmids were shown to express the uvsY or the uvsW gene products by their ability to complement the UV sensitivity of infecting uvsW or uvsY mutant phage. Also, a chimeric plasmid containing both the uvsW and uvsY genes increases the survival of UV-irradiated, methyl methane sulfonate- or ethyl methane sulfonate-treated recA hosts.

Dna repair pathways

Our knowledge about DNA repair mechanisms in mammalian cells is reviewed. Ways of measuring excision repair are summarized, and various modes of excision repair are described in terms of mechanisms that yield patch sizes of 0, 1, and few (short patch), and many (long patch) bases. The biological and molecular ways of measuring the effects of replication on a damaged template are presented, as are various models of postreplication repair.