Linked Life Data

17427291

Source:http://linkedlifedata.com/resource/pubmed/id/17427291

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2007-4-11
pubmed:abstractText
Elevated mistranslation induces a mutator response termed translational stress-induced mutagenesis (TSM) that is mediated by an unidentified modification of DNA polymerase III. Here we address two questions: (i) does TSM result from direct polymerase corruption, or from an indirect pathway triggered by increased protein turnover? (ii) Why are homologous recombination functions required for the expression of TSM under certain conditions, but not others? We show that replication of bacteriophage T4 in cells expressing the mutA allele of the glyVtRNA gene (Asp-Gly mistranslation), leads to both increased mutagenesis, and to an altered mutational specificity, results that strongly support mistranslational corruption of DNA polymerase. We also show that expression of mutA, which confers a recA-dependent mutator phenotype, leads to increased lambdoid prophage induction (selectable in vivo expression technology assay), suggesting that replication fork collapse occurs more frequently in mutA cells relative to control cells. No such increase in prophage induction is seen in cells expressing alaVGlu tRNA (Glu-->Ala mistranslation), in which the mutator phenotype is recA-independent. We propose that replication fork collapse accompanies episodic hypermutagenic replication cycles in mutA cells, requiring homologous recombination functions for fork recovery, and therefore, for mutation recovery. These findings highlight hitherto under-appreciated links among translation, replication and recombination, and suggest that translational fidelity, which is affected by genetic and environmental signals, is a key modulator of replication fidelity.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0950-382X
pubmed:author
pubmed:issnType
Print
pubmed:volume
62
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1752-63
pubmed:dateRevised
2009-3-18
pubmed:meshHeading
pubmed-meshheading:17427291-Bacteriophage T4, pubmed-meshheading:17427291-Base Sequence, pubmed-meshheading:17427291-DNA, Bacterial, pubmed-meshheading:17427291-DNA Mutational Analysis, pubmed-meshheading:17427291-DNA Polymerase III, pubmed-meshheading:17427291-DNA Replication, pubmed-meshheading:17427291-Escherichia coli, pubmed-meshheading:17427291-Escherichia coli Proteins, pubmed-meshheading:17427291-Models, Genetic, pubmed-meshheading:17427291-Molecular Sequence Data, pubmed-meshheading:17427291-Mutagenesis, pubmed-meshheading:17427291-Nucleic Acid Conformation, pubmed-meshheading:17427291-Plasmids, pubmed-meshheading:17427291-Protein Biosynthesis, pubmed-meshheading:17427291-Rec A Recombinases, pubmed-meshheading:17427291-SOS Response (Genetics), pubmed-meshheading:17427291-Sequence Analysis, DNA
pubmed:year
2006
pubmed:articleTitle
Hypermutagenesis in mutA cells is mediated by mistranslational corruption of polymerase, and is accompanied by replication fork collapse.
pubmed:affiliation
University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Department of Microbiology and Molecular Genetics, International Center for Public Health, 225 Warren Street, Newark, NJ 07101-1709, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural