Onuclease deficient DT40 cellsTo mutate a conserved residue, Asp269, in the exonuclease catalytic web-site into Ala, we generated a POLE1 exo- mutation knock-in construct carrying a BSRR selection-marker cassette. Genomic DNA sequences within the POLE1 (the catalytic subunit) gene had been amplified making use of primers, 5′- CCTGTCTCCATGGCTGCAGACAGC -3′ and 5′- GCCAGGAGATGTCACTTCTGTCTC -3′ for the …
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