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Analysis of spontaneous and psoralen-induced Salmonella typhimurium hisG46 revertants by oligodeoxyribonucleotide colony hybridization: use of psoralens to cross-link probes to target sequences.

Identifieur interne : 000877 ( Ncbi/Checkpoint ); précédent : 000876; suivant : 000878

Analysis of spontaneous and psoralen-induced Salmonella typhimurium hisG46 revertants by oligodeoxyribonucleotide colony hybridization: use of psoralens to cross-link probes to target sequences.

Auteurs : T A Cebula [États-Unis] ; W H Koch

Source :

RBID : pubmed:2179713

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English descriptors

Abstract

An improved DNA colony-hybridization method for the rapid characterization of Salmonella typhimurium hisG46 revertants is described. Oligodeoxyribonucleotides (15-mers) complementary to each of 6 possible transition or transversion mutations and an extragenic suppressor mutation, underlying the His+ phenotype, were prepared. Optimal sequence discrimination was achieved by hybridizing 15-mers at the apparent dissociation temperature (Td) for 2 h with chromosomal DNA of revertant colonies affixed to Whatman 541 filters. Subsequent exposure of filters to UVA radiation (320-400 nm) in the presence of 4'-hydroxymethyl-4,5',8-trimethylpsoralen (HMT) resulted in cross-linking of perfectly matched probes and target DNA sequences while sequences containing a single base-pair mismatch could be discriminated with a brief denaturing wash. No false negative results were obtained with the new procedure. An analysis of 204 spontaneous and 174 PUVA-induced TA100 revertants is presented.

DOI: 10.1016/0027-5107(90)90010-2
PubMed: 2179713


Affiliations:


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pubmed:2179713

Le document en format XML

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<term>DNA, Bacterial (genetics)</term>
<term>DNA, Bacterial (radiation effects)</term>
<term>Ficusin (pharmacology)</term>
<term>Furocoumarins (pharmacology)</term>
<term>Methods</term>
<term>Molecular Sequence Data</term>
<term>Nucleic Acid Hybridization</term>
<term>Oligodeoxyribonucleotides (genetics)</term>
<term>Reproducibility of Results</term>
<term>Salmonella typhimurium (genetics)</term>
<term>Ultraviolet Rays</term>
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<term>ADN bactérien (effets des radiations)</term>
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<term>Analyse de mutations d'ADN</term>
<term>Données de séquences moléculaires</term>
<term>Furocoumarines (pharmacologie)</term>
<term>Hybridation d'acides nucléiques</term>
<term>Méthodes</term>
<term>Oligodésoxyribonucléotides (génétique)</term>
<term>Psoralène (pharmacologie)</term>
<term>Rayons ultraviolets</term>
<term>Reproductibilité des résultats</term>
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<term>Salmonella typhimurium (génétique)</term>
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<term>Méthodes</term>
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<div type="abstract" xml:lang="en">An improved DNA colony-hybridization method for the rapid characterization of Salmonella typhimurium hisG46 revertants is described. Oligodeoxyribonucleotides (15-mers) complementary to each of 6 possible transition or transversion mutations and an extragenic suppressor mutation, underlying the His+ phenotype, were prepared. Optimal sequence discrimination was achieved by hybridizing 15-mers at the apparent dissociation temperature (Td) for 2 h with chromosomal DNA of revertant colonies affixed to Whatman 541 filters. Subsequent exposure of filters to UVA radiation (320-400 nm) in the presence of 4'-hydroxymethyl-4,5',8-trimethylpsoralen (HMT) resulted in cross-linking of perfectly matched probes and target DNA sequences while sequences containing a single base-pair mismatch could be discriminated with a brief denaturing wash. No false negative results were obtained with the new procedure. An analysis of 204 spontaneous and 174 PUVA-induced TA100 revertants is presented.</div>
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