The cellular mismatch repair system is able to repair mismatches within MLV retroviral double-stranded DNA at a low frequency.

Abstract:

:Eukaryotic cells possess several distinct mismatch repair pathways. A mismatch can be introduced in retroviral double-stranded DNA by a pre-existing mutation within the primer binding site (PBS) of the viral RNA genome. In order to evaluate mismatch repair of retroviral double-stranded DNA, Moloney leukemia virus (MLV)-based vectors with a mutation in their PBS were used to infect mismatch repair-competent as well as mismatch repair-deficient cell lines. If the target cells were capable of repairing the mismatch before an infected cell divided, the mismatch within the PBS could be repaired to the wild-type or mutant PBS. If the target cells were unable to repair the mismatch, half the cells in the colony should contain the mutant PBS while the other half should contain the wild-type PBS. To evaluate these predictions, individual colonies were isolated and analyzed by PCR. Almost all mismatch-deficient cell colonies analyzed (cell lines HCT 116 and PMS2-/-) contained both the wild-type and mutated PBS, therefore, mismatches within retroviral double-strand DNA could not be repaired by the mismatch-deficient cells. In contrast, mismatches in approximately 25% of the mismatch repair-competent cell clones analyzed (cell lines HeLa and PMS2+/+) were repaired, while 75% were not. Therefore, the cellular mismatch repair system is able to repair mismatches within viral double-stranded DNA, but at a low frequency.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Tang LY,Zhang J

doi

10.1093/nar/28.12.2302

keywords:

subject

Has Abstract

pub_date

2000-06-15 00:00:00

pages

2302-6

issue

12

eissn

0305-1048

issn

1362-4962

journal_volume

28

pub_type

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