Cadmium is a mutagen that acts by inhibiting mismatch repair.

Abstract:

:Most errors that arise during DNA replication can be corrected by DNA polymerase proofreading or by post-replication mismatch repair (MMR). Inactivation of both mutation-avoidance systems results in extremely high mutability that can lead to error catastrophe. High mutability and the likelihood of cancer can be caused by mutations and epigenetic changes that reduce MMR. Hypermutability can also be caused by external factors that directly inhibit MMR. Identifying such factors has important implications for understanding the role of the environment in genome stability. We found that chronic exposure of yeast to environmentally relevant concentrations of cadmium, a known human carcinogen, can result in extreme hypermutability. The mutation specificity along with responses in proofreading-deficient and MMR-deficient mutants indicate that cadmium reduces the capacity for MMR of small misalignments and base-base mismatches. In extracts of human cells, cadmium inhibited at least one step leading to mismatch removal. Together, our data show that a high level of genetic instability can result from environmental impediment of a mutation-avoidance system.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Jin YH,Clark AB,Slebos RJ,Al-Refai H,Taylor JA,Kunkel TA,Resnick MA,Gordenin DA

doi

10.1038/ng1172

keywords:

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

326-9

issue

3

eissn

1061-4036

issn

1546-1718

pii

ng1172

journal_volume

34

pub_type

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