Demonstration of allelic exchange in the slow-growing bacterium Mycobacterium avium subsp. paratuberculosis, and generation of mutants with deletions at the pknG, relA, and lsr2 loci

Taek Park Kun, John L. Dahl, John P. Bannantine, Raul G Barletta, Jongsam Ahn, Andrew J. Allen, Mary Jo Hamilton, William C. Davis

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Mycobacterium avium subsp. paratuberculosis is the causative pathogen of Johne's disease, a chronic inflammatory wasting disease in ruminants. This disease has been difficult to control because of the lack of an effective vaccine. To address this need, we adapted a specialized transduction system originally developed for M. tuberculosis and modified it to improve the efficiency of allelic exchange in order to generate site-directed mutations in preselected M. avium subsp. paratuberculosis genes. With our novel optimized method, the allelic exchange frequency was 78 to 100% and the transduction frequency was 1.1 × 10-7 to 2.9 × 10-7. Three genes were selected for mutagenesis: pknG and relA, which are genes that are known to be important virulence factors in M. tuberculosis and M. bovis, and lsr2, a gene regulating lipid biosynthesis and antibiotic resistance. Mutants were successfully generated with a virulent strain of M. avium subsp. paratuberculosis (M. avium subsp. paratuberculosis K10) and with a recombinant K10 strain expressing the green fluorescent protein gene, gfp. The improved efficiency of disruption of selected genes in M. avium subsp. paratuberculosis should accelerate development of additional mutants for vaccine testing and functional studies.

Original languageEnglish (US)
Pages (from-to)1687-1695
Number of pages9
JournalApplied and environmental microbiology
Volume74
Issue number6
DOIs
StatePublished - Mar 1 2008

Fingerprint

Paratuberculosis
Mycobacterium avium
Mycobacterium avium subsp. paratuberculosis
Bacteria
mutants
loci
bacterium
gene
bacteria
Genes
tuberculosis
genes
vaccine
vaccines
Tuberculosis
Chronic Wasting Disease
wasting syndrome
Vaccines
chronic wasting disease
paratuberculosis

ASJC Scopus subject areas

  • Biotechnology
  • Food Science
  • Applied Microbiology and Biotechnology
  • Ecology

Cite this

Demonstration of allelic exchange in the slow-growing bacterium Mycobacterium avium subsp. paratuberculosis, and generation of mutants with deletions at the pknG, relA, and lsr2 loci. / Kun, Taek Park; Dahl, John L.; Bannantine, John P.; Barletta, Raul G; Ahn, Jongsam; Allen, Andrew J.; Hamilton, Mary Jo; Davis, William C.

In: Applied and environmental microbiology, Vol. 74, No. 6, 01.03.2008, p. 1687-1695.

Research output: Contribution to journalArticle

Kun, Taek Park ; Dahl, John L. ; Bannantine, John P. ; Barletta, Raul G ; Ahn, Jongsam ; Allen, Andrew J. ; Hamilton, Mary Jo ; Davis, William C. / Demonstration of allelic exchange in the slow-growing bacterium Mycobacterium avium subsp. paratuberculosis, and generation of mutants with deletions at the pknG, relA, and lsr2 loci. In: Applied and environmental microbiology. 2008 ; Vol. 74, No. 6. pp. 1687-1695.
@article{bda8a05f92c84064851275edb57a8b2b,
title = "Demonstration of allelic exchange in the slow-growing bacterium Mycobacterium avium subsp. paratuberculosis, and generation of mutants with deletions at the pknG, relA, and lsr2 loci",
abstract = "Mycobacterium avium subsp. paratuberculosis is the causative pathogen of Johne's disease, a chronic inflammatory wasting disease in ruminants. This disease has been difficult to control because of the lack of an effective vaccine. To address this need, we adapted a specialized transduction system originally developed for M. tuberculosis and modified it to improve the efficiency of allelic exchange in order to generate site-directed mutations in preselected M. avium subsp. paratuberculosis genes. With our novel optimized method, the allelic exchange frequency was 78 to 100{\%} and the transduction frequency was 1.1 × 10-7 to 2.9 × 10-7. Three genes were selected for mutagenesis: pknG and relA, which are genes that are known to be important virulence factors in M. tuberculosis and M. bovis, and lsr2, a gene regulating lipid biosynthesis and antibiotic resistance. Mutants were successfully generated with a virulent strain of M. avium subsp. paratuberculosis (M. avium subsp. paratuberculosis K10) and with a recombinant K10 strain expressing the green fluorescent protein gene, gfp. The improved efficiency of disruption of selected genes in M. avium subsp. paratuberculosis should accelerate development of additional mutants for vaccine testing and functional studies.",
author = "Kun, {Taek Park} and Dahl, {John L.} and Bannantine, {John P.} and Barletta, {Raul G} and Jongsam Ahn and Allen, {Andrew J.} and Hamilton, {Mary Jo} and Davis, {William C.}",
year = "2008",
month = "3",
day = "1",
doi = "10.1128/AEM.01208-07",
language = "English (US)",
volume = "74",
pages = "1687--1695",
journal = "Applied and Environmental Microbiology",
issn = "0099-2240",
publisher = "American Society for Microbiology",
number = "6",

}

TY - JOUR

T1 - Demonstration of allelic exchange in the slow-growing bacterium Mycobacterium avium subsp. paratuberculosis, and generation of mutants with deletions at the pknG, relA, and lsr2 loci

AU - Kun, Taek Park

AU - Dahl, John L.

AU - Bannantine, John P.

AU - Barletta, Raul G

AU - Ahn, Jongsam

AU - Allen, Andrew J.

AU - Hamilton, Mary Jo

AU - Davis, William C.

PY - 2008/3/1

Y1 - 2008/3/1

N2 - Mycobacterium avium subsp. paratuberculosis is the causative pathogen of Johne's disease, a chronic inflammatory wasting disease in ruminants. This disease has been difficult to control because of the lack of an effective vaccine. To address this need, we adapted a specialized transduction system originally developed for M. tuberculosis and modified it to improve the efficiency of allelic exchange in order to generate site-directed mutations in preselected M. avium subsp. paratuberculosis genes. With our novel optimized method, the allelic exchange frequency was 78 to 100% and the transduction frequency was 1.1 × 10-7 to 2.9 × 10-7. Three genes were selected for mutagenesis: pknG and relA, which are genes that are known to be important virulence factors in M. tuberculosis and M. bovis, and lsr2, a gene regulating lipid biosynthesis and antibiotic resistance. Mutants were successfully generated with a virulent strain of M. avium subsp. paratuberculosis (M. avium subsp. paratuberculosis K10) and with a recombinant K10 strain expressing the green fluorescent protein gene, gfp. The improved efficiency of disruption of selected genes in M. avium subsp. paratuberculosis should accelerate development of additional mutants for vaccine testing and functional studies.

AB - Mycobacterium avium subsp. paratuberculosis is the causative pathogen of Johne's disease, a chronic inflammatory wasting disease in ruminants. This disease has been difficult to control because of the lack of an effective vaccine. To address this need, we adapted a specialized transduction system originally developed for M. tuberculosis and modified it to improve the efficiency of allelic exchange in order to generate site-directed mutations in preselected M. avium subsp. paratuberculosis genes. With our novel optimized method, the allelic exchange frequency was 78 to 100% and the transduction frequency was 1.1 × 10-7 to 2.9 × 10-7. Three genes were selected for mutagenesis: pknG and relA, which are genes that are known to be important virulence factors in M. tuberculosis and M. bovis, and lsr2, a gene regulating lipid biosynthesis and antibiotic resistance. Mutants were successfully generated with a virulent strain of M. avium subsp. paratuberculosis (M. avium subsp. paratuberculosis K10) and with a recombinant K10 strain expressing the green fluorescent protein gene, gfp. The improved efficiency of disruption of selected genes in M. avium subsp. paratuberculosis should accelerate development of additional mutants for vaccine testing and functional studies.

UR - http://www.scopus.com/inward/record.url?scp=40849135695&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=40849135695&partnerID=8YFLogxK

U2 - 10.1128/AEM.01208-07

DO - 10.1128/AEM.01208-07

M3 - Article

VL - 74

SP - 1687

EP - 1695

JO - Applied and Environmental Microbiology

JF - Applied and Environmental Microbiology

SN - 0099-2240

IS - 6

ER -