Infectivity of urogenitalChlamydia trachomatisplasmid-deficient, CT135-null, and double-deficient strains in female mice
Year: 2013
Type: article
Abstract: Chlamydia trachomatis is the most common cause of human bacterial sexually transmitted infections and is the world's leading cause of infectious preventable blindness. The chlamydial 7.5-kb plasmid and chromosomal gene CT135 have been shown to be important virulence factors in both nonhuman primate and mouse infection models. Chlamydia trachomatis plasmid-deficient urogenital isolates and a predicted CT135 null mutant have been evaluated independently in the female mouse genital tract model and both have been shown to reduce infectivity and virulence. However, these attenuating phenotypes have not been evaluated collectively in the murine model. Here, we test the infectivity of C. trachomatis serovar D strains in the mouse model that are plasmid-deficient, CT135 disrupted, or possess a combination of these attenuating genotypes. We find that the presence of the plasmid results in infections with higher infectious burdens, whereas CT135 facilitates a more protracted or chronic infection. Not unexpectedly, a combination of these genetic deficiencies resulted in a strain with enhanced infection attenuation characteristics. A composite figure showing scanning (left) and transmission (right-center) electron photomicrographs of Chlamydia trachomatis infected epithelial cells. The biosynthesis of glycogen (gold granules among blue developmental forms) is dependent on the chlamydial plasmid which is thought to be an important virulence factor.
Source: Pathogens and Disease
Language: English
Subfield: Microbiology
Field: Immunology and Microbiology
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W2015915274