DNA mismatch repair in lymphoblastoid cells from hereditary non-polyposis colorectal cancer (HNPCC) patients is normal under conditions of rapid cell division and increased mutational load.

Abstract excerpt

Patients with hereditary non-polyposis colorectal cancer (HNPCC) have germ-line mutations in one of four DNA mismatch repair genes (hMSH2, hMLH1, hPMS1 and hPMS2). It is supposed that a single functional copy of these genes is sufficient for normal mismatch repair, but it is not certain that this is the case under abnormal conditions such as rapid cell division or an increased tendency to DNA replication errors...

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