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Transduction

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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Subversion of Retrograde Trafficking by Translocated Pathogen Effectors.

Nicolas Personnic1, Kevin Bärlocher1, Ivo Finsel2

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|March 1, 2016
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Summary

Intracellular bacteria hijack host cell retrograde transport to survive. Pathogens like Legionella and Salmonella manipulate this pathway for replication within specialized vacuoles.

Keywords:
bacterial effector proteinhost–pathogen interactionpathogen vacuolephosphoinositide lipidretromersmall GTPase

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Area of Science:

  • Microbiology
  • Cell Biology
  • Pathogenesis

Background:

  • Intracellular bacterial pathogens establish replication niches by subverting host endocytic pathways.
  • Pathogen vacuoles are formed using effector proteins translocated via type III or type IV secretion systems.
  • These effectors manipulate host vesicle trafficking and signaling pathways.

Purpose of the Study:

  • To review host cell retrograde trafficking pathways.
  • To explore how various vacuolar pathogens subvert retrograde transport.
  • To highlight distinct pathogen strategies for intracellular survival and replication.

Main Methods:

  • Literature review of current research on host retrograde transport.
  • Analysis of effector protein functions in pathogen vacuole formation.
  • Comparative study of evasion mechanisms employed by different bacterial genera.

Main Results:

  • Retrograde transport from endosomes to the trans-Golgi network is crucial for pathogen vacuole formation.
  • Pathogens like Legionella, Coxiella, Salmonella, Chlamydia, and Simkania utilize distinct strategies to hijack this pathway.
  • Subversion of retrograde transport facilitates pathogen survival and replication within host cells.

Conclusions:

  • Host cell retrograde transport is a common target for intracellular pathogens.
  • Understanding these pathogen-host interactions is key to developing novel therapeutic strategies.
  • Diverse bacterial species have evolved convergent yet distinct mechanisms to exploit host cell machinery.