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POPULATION GENETICS AND EVOLUTION

Natural Isolates of Salmonella enterica Serovar Dublin Carry a Single nadA Missense Mutation

Ulfar Bergthorsson, John R. Roth
Ulfar Bergthorsson
Department of Biology, University of Utah, Salt Lake City, Utah
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John R. Roth
Department of Biology, University of Utah, Salt Lake City, Utah
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  • For correspondence: jrroth@ucdavis.edu
DOI: 10.1128/JB.187.1.400-403.2005
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ABSTRACT

Nicotinic acid is required by most isolates of Salmonella enterica (serovar Dublin), a pathogen of cattle. A single nadA missense mutation causes the nutritional requirement of all serovar Dublin isolates tested. Models for persistence of this allele are tested and discussed.

  • Copyright © 2005 American Society for Microbiology
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Natural Isolates of Salmonella enterica Serovar Dublin Carry a Single nadA Missense Mutation
Ulfar Bergthorsson, John R. Roth
Journal of Bacteriology Dec 2004, 187 (1) 400-403; DOI: 10.1128/JB.187.1.400-403.2005

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Natural Isolates of Salmonella enterica Serovar Dublin Carry a Single nadA Missense Mutation
Ulfar Bergthorsson, John R. Roth
Journal of Bacteriology Dec 2004, 187 (1) 400-403; DOI: 10.1128/JB.187.1.400-403.2005
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  • Article
    • ABSTRACT
    • (i) Relaxed selection for prototrophy.
    • (ii) Conditional auxotrophy.
    • (iii) Selection for auxotrophy.
    • (iv) Mutation pressure.
    • Auxotrophy of serovar Dublin isolates.
    • Reversion tests.
    • Initial evidence for a nadA mutation.
    • The serovar Dublin nadA allele is necessary and sufficient for auxotrophy.
    • Comparing nadA sequences of enteric bacteria.
    • A search for conditions that suppress the auxotrophy of serovar Dublin.
    • Pyridine limitation does not provide antibiotic resistance in serovar Dublin.
    • Frequency of Nad auxotrophs in natural isolates of S. enterica and E. coli.
    • Natural auxotrophy is not associated with mutators or hot spots.
    • Summary.
    • ACKNOWLEDGMENTS
    • FOOTNOTES
    • REFERENCES
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KEYWORDS

Mutation, Missense
NAD
Salmonella enterica

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