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Related Concept Videos

Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
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The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
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Lysogenic Cycle of Bacteriophages00:43

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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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Transduction01:16

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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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DNA Bacteriophages01:26

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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CRISPR and crRNAs02:53

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses
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Subversion of host genome integrity by bacterial pathogens.

Cindrilla Chumduri1, Rajendra Kumar Gurumurthy1, Rike Zietlow1

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Bacterial infections can damage host cell DNA through toxins or immune responses, disrupting DNA repair and potentially leading to cancer. Understanding this link is crucial for combating infection-related diseases.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Pathogen-Host Interactions

Background:

  • Mammalian cells have DNA damage response (DDR) mechanisms to maintain genomic stability.
  • Failure in DDR leads to DNA damage accumulation and genomic instability.
  • Bacterial infections are increasingly recognized as a source of DNA damage in host cells.

Purpose of the Study:

  • To explore how bacterial infections induce DNA damage in mammalian cells.
  • To investigate the mechanisms by which pathogens cause DNA damage.
  • To understand the implications of altered DDR signaling in infection-associated mutagenesis and cancer.

Main Methods:

  • Review of existing literature on bacterial pathogenesis and DNA damage response.
  • Analysis of studies detailing genotoxic bacterial toxins.
  • Examination of research on host-pathogen interactions affecting cellular signaling pathways.

Main Results:

  • Bacteria can induce DNA damage directly via genotoxic toxins or indirectly through host defense activation.
  • Pathogen infection can dysregulate host cell DNA damage response pathways.
  • Altered DDR in the context of bacterial DNA damage can promote mutations and oncogenesis.

Conclusions:

  • Bacterial infections represent a significant environmental factor contributing to genomic instability.
  • The interplay between bacterial factors and host DDR pathways has critical implications for cancer development.
  • Targeting bacteria-mediated DNA damage pathways may offer novel strategies for cancer prevention and treatment.