Unknown,Transcriptomics,Genomics,Proteomics

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Glycogen Accumulation in Chlamydia trachomatis is Controlled by its Plasmid Through Regulation of glgA


ABSTRACT: C. trachomatis possess a cryptic 7.5 kb plasmid of unknown function. Here we describe a comprehensive molecular and biological characterization of the naturally occurring plasmidless human Chlamydia trachomatis strain L2 (25667R). We found that despite minimal chromosomal polymorphisms the LGV L2 (25667R) strain was indistinguishable from the L2 (434) plasmid positive strain in its in vitro infectivity characteristics such as growth kinetics, plaquing efficiency, and plaque size. The primary in vitro phenotypic differences between L2 (434) and L2 (25667R) were the accumulation of glycogen granules in the inclusion matrix and the lack of the typical intra-inclusion Brownian-like movement characteristic of C. trachomatis strains. Conversely, we observed a marked difference between the two strains in their ability to colonize and infect the female mouse genital tract. The ID50 of the L2 (25667R) plasmidless strain was 500 fold greater (1.XX x 10X IFU) than the L2 (434) plasmid bearing strain (1. XX x 10X IFU). Transcriptome analysis of the two strains clearly demonstrated a decrease in transcript levels of a subset of chromosomal genes for the L2 (25667R) strain. Among those genes was glgA which encodes for glycogen synthase; a finding consistent with the failure of the L2 (25667R) strain to accumulate glycogen granules. Collectively, these findings support an important role for the plasmid in in vivo infectivity and suggest that this virulence characteristic might be controlled by the plasmids ability to regulate the expression of specific chromosomal genes. These results also support an important role for the plasmid in the pathogenesis of human infection and disease. Keywords: strain comparison C. trachomatis strain L2-25667R compared to strain L2-434

ORGANISM(S): Chlamydia trachomatis

SUBMITTER: Neysha Martinez-Orengo 

PROVIDER: E-GEOD-10199 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

The Chlamydia trachomatis plasmid is a transcriptional regulator of chromosomal genes and a virulence factor.

Carlson John H JH   Whitmire William M WM   Crane Deborah D DD   Wicke Luke L   Virtaneva Kimmo K   Sturdevant Daniel E DE   Kupko John J JJ   Porcella Stephen F SF   Martinez-Orengo Neysha N   Heinzen Robert A RA   Kari Laszlo L   Caldwell Harlan D HD  

Infection and immunity 20080317 6


Chlamydia trachomatis possesses a cryptic 7.5-kb plasmid of unknown function. Here, we describe a comprehensive molecular and biological characterization of the naturally occurring plasmidless human C. trachomatis strain L2(25667R). We found that despite minimal chromosomal polymorphisms, the LGV strain L2(25667R) was indistinguishable from plasmid-positive strain L2(434) with regard to its in vitro infectivity characteristics such as growth kinetics, plaquing efficiency, and plaque size. The on  ...[more]

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