extrusion strategy of chlamydia exit

Intracellular pathogens have evolved numerous strategies for promoting their exit from host cells, consistent with the essential role of exit for pathogenesis. Yet despite this fundamental importance, microbial exit largely remains an unexplored research area. Efforts in our lab aim to advance understanding of this new theme.

Our pioneering discoveries forged the current understanding of Chlamydia exit from host cells. Chlamydiae possess two mechanisms for accomplishing cellular escape that are mutually exclusive: extrusion and lysis. Extrusion is a packaged release of Chlamydiain which the bacteria are pinched off from the host cell into a membrane-encased compartment, a process that leaves the original host cell intact. Extrusions are novel structures that enhance the biology of Chlamydia infection in many fascinating ways, such as serving as a ‘stealth shuttle’ as these bacteria attempt to elude the host immune system.

Related papers

The Chlamydia trachomatis extrusion exit mechanism is regulated by host abscission proteins
Zuck M & Hybiske K. Microorganisms (2019). PubMed | Journal

Chlamydia trachomatis cellular exit alters interactions with host dendritic cells
Sherrid AM & Hybiske K. Infect Immun (2017). PubMed | Journal

Extrusions are phagocytosed and promote Chlamydia survival within macrophages
Zuck M, Ellis T, Venida A, Hybiske K. Cell Microbiol (2017). PubMed | Journal

Conservation of extrusion as an exit mechanism for Chlamydia
Zuck M, Sherrid A, Suchland R, Ellis T, Hybiske K. Pathog Dis (2016). PubMed | Journal

Actin recruitment to the Chlamydia inclusion is spatiotemporally regulated by a mechanism that requires host and bacterial factors
Chin E, Kirker K, Zuck M, James G, Hybiske K. PLoS One (2012). PubMed | Journal

Mechanisms of host cell exit by the intracellular bacterium Chlamydia
Hybiske K & Stephens RS. Proc Natl Acad Sci USA (2007). PubMed | Journal

Discovery of Chlamydia virulence factors

Genome-wide discovery and characterization of virulence determinants for Chlamydia remains a major unaddressed research area. Through recent landmark advances in genetic manipulation of Chlamydia, and a rich collaboration with Scott Hefty and Dan Rockey that exploits new methodologies for genetic engineering in Chlamydia, we are working to discover the Chlamydia genes and host protein targets that play critical roles in Chlamydia infection and pathogenesis. 

Related papers

Expanding the molecular toolkit for Chlamydia
Hybiske K. Cell Host Microbe (2015). PubMed | Journal

a curated model organism database for the Chlamydia research community

Together with the Su Lab, experts in aggregating community acquired research knowledge into open source databases, we are proud to announce the launch of ChlamBase.org. ChlamBase is a fork of WikiGenomes.org, a Wikidata-backed database of over 100 NCBI microbial reference genomes. The goal of ChlamBase is to provide a streamlined, researcher-curated database of genetic and proteomic knowledge for the Chlamydia research community. This database uniquely offers information not available on other services, such as:

• Current gene annotations

• Orthologous gene comparisons and alignments

• Annotations of Chlamydia mutants

• Developmental expression timing

• RB/EB expression

• Host and bacterial protein interactions

Related papers

ChlamBase: a curated model organism database for the Chlamydia research community
Putman T, Hybiske K, Jow D, Afrasiabi C, Lelong S, Cano MA, Wu C, Su AI. Database (2019). PubMed | Journal