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Development of Immunocompetence01:22

Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
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Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

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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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Active versus Passive Immunity01:31

Active versus Passive Immunity

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Immunity, along with the ability to limit pathogen growth to prevent significant body tissue damage, can be gained either by (1) actively developing an immune response within the individual after exposure to a pathogen or after getting vaccinated or (2) passively transferring immune components from an immune individual to one who is nonimmune. Both these forms of immunity can be found naturally and in medical practices.
Active Immunity
Active immunity refers to the resistance one develops...
622

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Related Experiment Video

Updated: Jun 23, 2025

Analysis of Simian Immunodeficiency Virus-specific CD8+ T-cells in Rhesus Macaques by Peptide-MHC-I Tetramer Staining
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The immunity gap in primates.

Clara L Mariencheck1

  • 1Center for the Advanced Study of Human Paleobiology, Department of Anthropology, The George Washington University, Washington, District of Columbia, USA.

Evolutionary Anthropology
|June 15, 2024
PubMed
Summary

Females generally exhibit stronger immune responses than males, despite reproductive demands. This review explores the reasons for this immunity gap in primates, considering genetics and hormones.

Keywords:
X chromosomeevolutiongeneticsimmune systemlife historyselectionsexual dimorphism

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Area of Science:

  • Comparative immunology
  • Evolutionary biology
  • Primate studies

Background:

  • Vertebrates display sexual dimorphism in disease response, with females often showing greater immunocompetence than males.
  • Females generally experience lower cancer rates but higher autoimmune disorder incidence compared to males.
  • These sex-based differences in immunity are potentially influenced by life history, sexual selection, genetics, and hormonal factors.

Purpose of the Study:

  • To review evidence supporting the female immunocompetence advantage in primates.
  • To examine hypotheses explaining the evolution of this immunity gap.
  • To explore the role of X chromosome genes and heterozygosity in female immunocompetence.

Main Methods:

  • Literature review of studies on sex differences in vertebrate and primate immunity.
  • Analysis of hypotheses related to life history, sexual selection, genetics, and hormones.
  • Investigation into the potential contribution of X-linked genes and heterozygosity.

Main Results:

  • Evidence suggests females generally possess enhanced immunocompetence compared to males across vertebrates, including primates.
  • Hypotheses include trade-offs between reproduction and immunity, sexual selection pressures, and genetic factors.
  • The X chromosome and heterozygosity are proposed as significant contributors to sex-based immune dimorphism.

Conclusions:

  • Primates provide a valuable model for studying the evolution of enhanced female immunocompetence due to their complex social structures and life histories.
  • The immunity gap between sexes is likely multifactorial, involving evolutionary, genetic, and physiological elements.
  • Further research into X chromosome-specific genes and heterozygosity is crucial for a comprehensive understanding of sex differences in immunity.