Linked Life Data

9890195

Source:http://linkedlifedata.com/resource/pubmed/id/9890195

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1999-3-10
pubmed:abstractText
Lead and mercury are toxic metals that are widely distributed in the atmosphere, soil, and groundwater. It is estimated that 2-4 x 10(4) tons of these metals are released annually into the environment by natural and industrial processes. Therefore, human exposure to low relatively nontoxic concentrations of these metals is unavoidable. However, the possible health effects of such exposure remain controversial. We have previously reported that low, subthreshold concentrations (0.1-1 microM) of these metals are mutagenic in the transgenic Chinese hamster ovary cell line AS52. The purpose of the present study is to determine the types of mutations induced in the gpt gene in AS52 cells. Using multiplex polymerase chain reaction and southern blot analyses, we characterized the 138 lead-induced, 192 mercury-induced, 29 reactive oxygen radical-induced, and 20 spontaneously arising mutants for point and deletion mutations in the gpt gene. Similar levels of point mutations were observed in the lead- and mercury-induced populations (47.8 and 53.6, respectively), which was significantly less than that occurring in the spontaneously arising and reactive oxygen intermediate-induced mutants. However, further examination of the data revealed that at concentrations of the metals of equal to or less than 0.4 microM, the majority of the mutations in the gpt gene were point mutations, while at higher concentrations, deletions (partial and complete) were the predominant type of mutation. These results are consistent with the hypothesis that lead and mercury induce mutations in eukaryotic cells by at least two distinct mechanisms.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1095-6670
pubmed:author
pubmed:issnType
Print
pubmed:volume
13
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
107-12
pubmed:dateRevised
2005-11-17
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
Lead and mercury mutagenesis: type of mutation dependent upon metal concentration.
pubmed:affiliation
Department of Medical Microbiology, Comprehensive Cancer Center, The Ohio State University, Columbus 43210, USA.
pubmed:publicationType
Journal Article