Linked Life Data

15595848

Source:http://linkedlifedata.com/resource/pubmed/id/15595848

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
50
pubmed:dateCreated
2004-12-14
pubmed:abstractText
Codon 273 ((5)(')CGT) of the human P53 gene is a mutational hot spot for the environmental carcinogen benzo[a]pyrene. We incorporated a single (+)- or (-)-trans-anti-benzo[a]pyrene diol epoxide (BPDE) DNA adduct at the second position of codon 273 of the human P53 gene and explored the mutagenic potential of this lesion in mammalian cells. Oligodeoxyribonucleotides ((5)(')GAGGTGCG(BPDE)TGTTTGT) modified with (+)- or (-)-trans-dG-N(2)-BPDE were incorporated into single-stranded shuttle vectors and transfected into simian kidney cells. Progeny plasmids were then used to transform Escherichia coli DH10B. Transformants were analyzed by oligodeoxynucleotide hybridization and DNA sequence analysis to establish the mutation frequency and spectrum produced by the adducted base. We determined the mutational frequencies associated with (+)-trans-dG-N(2)-BPDE and (-)-trans-dG-N(2)-BPDE adduction to be 26.5% and 17.5%, respectively. The predominant mutations generated by both stereoisomers were G --> T transversions, with some G --> A transitions. When the cytosine 5' to dG-N(2)-BPDE was replaced by 5-methylcytosine, the mutational frequencies of (+)-trans-dG-N(2)-BPDE and (-)-trans-dG-N(2)-BPDE were reduced to 11.1% and 10.6%, respectively, while the mutational specificity remained unchanged. Thus, the mutational "hot spot" at codon 273 in P53 may reflect either sequence-specific reactivity of BPDE and/or inefficient repair of BPDE-DNA adducts positioned at this site.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
21
pubmed:volume
43
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
15922-8
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Mutagenic potential of benzo[a]pyrene-derived DNA adducts positioned in codon 273 of the human P53 gene.
pubmed:affiliation
Laboratory of Chemical Biology, Department of Pharmacological Sciences, State University of New York at Stony Brook, Stony Brook, New York 11794-8651, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.