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. 1991 Jun;11(6):3163–3170. doi: 10.1128/mcb.11.6.3163

Multiple dispersed spontaneous mutations: a novel pathway of mutation in a malignant human cell line.

J Harwood 1, A Tachibana 1, M Meuth 1
PMCID: PMC360167  PMID: 2038324

Abstract

We analyzed the nature of spontaneous mutations at the autosomal locus coding for adenine phosphoribosyltransferase in the human colorectal carcinoma cell line SW620 to establish whether distinctive mutational pathways exist that might underlie the more complex genome rearrangements arising in tumor cells. Point mutations occur at a low rate in aprt hemizygotes derived from SW620, largely as a result of base substitutions at G.C base pairs to yield transversions and transitions. However, a novel pathway is evident in the form of multiple dispersed mutations in which two errors, separated by as much as 1,800 bp, fall in the same mutant gene. Such mutations could be the result of error-prone DNA synthesis occurring during normal replication or during long-patch excision-repair of spontaneously arising DNA lesions. This process could also contribute to the chromosomal instability evident in these tumor cells.

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