Linked Life Data

17354604

Source:http://linkedlifedata.com/resource/pubmed/id/17354604

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2007-3-14
pubmed:abstractText
The evolution of the genome of the pathogenic agent of the seventh cholera pandemia Vibrio cholerae eltor biovariant was thought to occur by acquiring not only structural genes of virulence but also regulatory systems as a result of horizontal transfer events. The polymerase chain reaction revealed the presence of the following regulatory genes that control the virulence gene expression in the chromosome of pre-pandemic and pandemic strains of cholera vibrios eltor: toxR, toxT, tcpP, tcpH, luxS, luxO, crp, vicH, pepA. The avirulent V. cholerae strain ATCC14033 isolated in 1910 (hypothetical predecessor of the cholera eltor agent) was shown to be lacking the regulatory genes toxT, tcpP, tcpHlocalized in the pathogenicity island VPI-1, and to be capable of realizing positive control over the expression of the virulence genes involved in the ToxR regulon. The virulent strains isolated from cholera patients during the local cholera outbreak in Indonesia in 1937 did not differ from the strains that caused cholera eltor pandemic in 1961. The strains had identical content of the regulatory genes tested. Only one strain of the four isolates studied contained no tcpPgene. Two key regulatory genes, toxR and toxT, were sequenced in all the isolates. The toxR nucleotide sequence of three pre-pandemic strains was shown to be indistinguishable from that of the pandemic isolates. On the other hand, the clinical strain MAK757 isolated prior to the emergence of the epidemic demonstrated an altered nucleotide sequence in its toxR gene. Experiments with the intra-intestinal challenge of suckling rabbits were indicative of similar virulence levels for the pre-pandemic and pandemic clinical strains. These results may serve as the evidence of the in vivo activity of the pre-pandemic strains of the toxT, tcpH, and tcpP positive regulatory genes that acquired in V. cholerae during the evolutionary process.
pubmed:language
rus
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0208-0613
pubmed:author
pubmed:issnType
Print
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
15-22
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
[A study of the prevalence of regulatory genes controlling virulence gene expression among Vibrio choleraeeltor biovariant strains varying in their pandemic potential].
pubmed:publicationType
Journal Article, Comparative Study, English Abstract