Abstract
Many studies revealed that poly(ADP-ribose) polymerase (Pare) is involved in DNA-damage recovery, cell-death induction and maintenance of genomic stability. We generated mouse Parp+/- embryonic stem (ES) cell lines by disrupting one allele of Parp exon 1 with a neomycin-resistance gene-cassette and subsequently produced Parp-/- ES cells by disrupting the remaining allele with a puromycin-resistance genecassette. Parp activity was decreased to half in Parp+/- ES cell clones and lost in Parp-/- ES cell clones. Growth rates of Parp+/- and Parp-/- ES cell clones were similar to that of parental J1 ES cells, indicating that Parp is not required for ES cell proliferation. These Parp-/- ES cells will be useful to study biological role of poly(ADP-ribosyl)ation reaction.
