Linked Life Data

1608950

Source:http://linkedlifedata.com/resource/pubmed/id/1608950

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pubmed-article:1608950pubmed:abstractTextIf excision repair-proficient human cells are allowed time for repair before onset of S phase, the premutagenic lesions formed by (+/-)-7 beta,8 alpha-dihydroxy-9 alpha,10 alpha-epoxy- 7,8,9,10-tetrahydrobenzo[a]pyrene (benzo[a]pyrene diol epoxide, BPDE) are lost from the transcribed strand of the hypoxanthine (guanine) phosphoribosyltransferase (HPRT) gene faster than from the nontranscribed strand. No change in strand distribution is seen with repair-deficient cells. These results suggest strand-specific repair of BPDE-induced DNA damage in human cells. To test this, we measured the initial number of BPDE adducts formed in each strand of the actively transcribed HPRT gene and the rate of repair, using UvrABC excinuclease in conjunction with Southern hybridization and strand-specific probes. We also measured the rate of loss of BPDE adducts from the inactive 754 locus. The frequencies of adducts formed by exposure to BPDE (1.0 or 1.2 microM) in either strand of a 20-kilobase fragment that lies entirely within the transcription unit of the HPRT gene were similar; the frequency in the 14-kilobase 754 fragment was approximately 20% lower. The rates of repair in the two strands of the HPRT fragment differed significantly. Within 7 hr after treatment with 1.2 microM BPDE, 53% of the adducts had been removed from the transcribed strand, but only 26% from the nontranscribed strand; after 20 hr, these values were 87% and 58%, respectively. In contrast, only approximately 14% of the BPDE adducts were lost from the 754 locus in 20 hr, a value even lower than the rate of loss from the overall genome (i.e., 38%). These results demonstrate strand-specific and preferential repair of BPDE adducts in human cells. They suggest that the heterogeneous repair of BPDE adducts in the human genome cannot be accounted for merely by the greatly increased rate of the repair specific to the transcribed strand of the active genes, and they point to a role for the chromatin structure.lld:pubmed
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pubmed-article:1608950pubmed:articleTitlePreferential repair and strand-specific repair of benzo[a]pyrene diol epoxide adducts in the HPRT gene of diploid human fibroblasts.lld:pubmed
pubmed-article:1608950pubmed:affiliationDepartment of Microbiology, Michigan State University, East Lansing 48824-1316.lld:pubmed
pubmed-article:1608950pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1608950pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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