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Related Concept Videos

Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
Innate immunity is the body's natural, nonspecific defense system that acts quickly to protect against pathogens. It incorporates physical barriers like skin and mucous membranes and cellular elements such as phagocytes and natural killer cells. This part of our immune system provides an immediate,...
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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 are...
Cells of the Adaptive Immune Response01:23

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
Defense Against Bacterial Pathogens01:31

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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
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Colonisation of Pathogens01:25

Colonisation of Pathogens

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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Studying Inherited Immunity in a Caenorhabditis elegans Model of Microsporidia Infection
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Published on: April 6, 2022

Has innate immunity evolved through different routes?

Nicolò Parrinello1

  • 1Dipartimento di Biologia Animale, Università di Palermo, Via Archirafi 18, 9123 Palermo, Italy. nicpar@unipa.it

Physics of Life Reviews
|April 9, 2010
PubMed
Summary
This summary is machine-generated.

Invertebrate immune systems, crucial for survival and reproduction, share conserved genes. Upregulation of innate immunity during ascidian metamorphosis supports the danger hypothesis.

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Area of Science:

  • Invertebrate immunology
  • Developmental biology
  • Evolutionary genetics

Background:

  • Invertebrate self/non-self recognition, defense, mating, and development rely on innate immune surveillance.
  • Immune functions are challenged by environmental competition, impacting organismal fitness.

Discussion:

  • Conserved gene traits may underpin independent evolutionary branches of immune responses.
  • Immunity genes might be conserved due to essential roles in developmental processes.

Key Insights:

  • Innate immunity plays a fundamental role across various invertebrate life functions.
  • Ascidian metamorphosis shows a significant upregulation of innate immunity genes.

Outlook:

  • The findings support the danger hypothesis in invertebrate immunity.
  • Further research can explore the interplay between immunity and development in invertebrates.