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A hotspot for transition mutations in the rIIB gene of bacteriophage T4

Identifieur interne : 000626 ( Istex/Corpus ); précédent : 000625; suivant : 000627

A hotspot for transition mutations in the rIIB gene of bacteriophage T4

Auteurs : Britta Swebilius Singer

Source :

RBID : ISTEX:1BCA4327C67BF00D059FBBF9F451FAD0AAB6AD4B

English descriptors

Abstract

Summary: We have previously demonstrated that the sequence 5′TGGCAA 3′ located at codons 32–33 of the rIIB gene of bacteriophage T4 is a hotspot for transition mutations (Nelson et al. 1981). Here I report the properties of the same TGGCAA sequence introduced into the gene at codons 11–12. The sequence is highly mutable in both locations, suggesting that its high mutability is due to features of the TGGCAA itself and is not dependent on the immediate juxtaposition of additional external sequences. Within this sequence, at either location, only the transition at the central G:C pair frequently arises spontaneously or by 2-aminopurine or ethylmethane sulfonate mutagenesis. However, the 3′ G:C pair, in addition, is highly mutable after nitrous acid or hydroxylamine treatment. This suggests that, within the TGGCAA sequence, there are two hotspots which are targeted by different mutagens.

Url:
DOI: 10.1007/BF00327422

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ISTEX:1BCA4327C67BF00D059FBBF9F451FAD0AAB6AD4B

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<abstract lang="en">Summary: We have previously demonstrated that the sequence 5′TGGCAA 3′ located at codons 32–33 of the rIIB gene of bacteriophage T4 is a hotspot for transition mutations (Nelson et al. 1981). Here I report the properties of the same TGGCAA sequence introduced into the gene at codons 11–12. The sequence is highly mutable in both locations, suggesting that its high mutability is due to features of the TGGCAA itself and is not dependent on the immediate juxtaposition of additional external sequences. Within this sequence, at either location, only the transition at the central G:C pair frequently arises spontaneously or by 2-aminopurine or ethylmethane sulfonate mutagenesis. However, the 3′ G:C pair, in addition, is highly mutable after nitrous acid or hydroxylamine treatment. This suggests that, within the TGGCAA sequence, there are two hotspots which are targeted by different mutagens.</abstract>
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<titleInfo>
<title>Molecular and General Genetics MGG</title>
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<titleInfo type="abbreviated">
<title>Molec. Gen. Genet.</title>
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<publisher>Springer</publisher>
<dateIssued encoding="w3cdtf">1984-01-01</dateIssued>
<copyrightDate encoding="w3cdtf">1984</copyrightDate>
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<subject>
<genre>Life Sciences</genre>
<topic>Biochemistry, general</topic>
<topic>Cell Biology</topic>
<topic>Microbial Genetics and Genomics</topic>
</subject>
<identifier type="ISSN">0026-8925</identifier>
<identifier type="eISSN">1432-1874</identifier>
<identifier type="JournalID">438</identifier>
<identifier type="IssueArticleCount">33</identifier>
<identifier type="VolumeIssueCount">3</identifier>
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<date>1984</date>
<detail type="volume">
<number>193</number>
<caption>vol.</caption>
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<number>1</number>
<caption>no.</caption>
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<extent unit="pages">
<start>104</start>
<end>109</end>
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<recordOrigin>Springer-Verlag, 1984</recordOrigin>
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<identifier type="ark">ark:/67375/1BB-R7XTH1WQ-M</identifier>
<identifier type="DOI">10.1007/BF00327422</identifier>
<identifier type="ArticleID">BF00327422</identifier>
<identifier type="ArticleID">Art17</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Springer-Verlag, 1984</accessCondition>
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<recordOrigin>Springer-Verlag, 1984</recordOrigin>
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