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What is the Immune System?01:38

What is the Immune System?

Overview
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,...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Transduction01:16

Transduction

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...

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Video Experimental Relacionado

Updated: Jun 7, 2026

Generation of Human Alloantigen-specific T Cells from Peripheral Blood
09:47

Generation of Human Alloantigen-specific T Cells from Peripheral Blood

Published on: November 21, 2014

La evolución de los sistemas inmunológicos adaptativos.

Max D Cooper1, Matthew N Alder

  • 1Division of Developmental and Clinical Immunology, Departments of Medicine, Microbiology, Pediatrics, and Pathology, University of Alabama at Birmingham, Birmingham, AL 35294, USA. max.cooper@ccc.uab.edu

Cell
|February 25, 2006
PubMed
Resumen

La inmunidad adaptativa evolucionó en los vertebrados utilizando dos métodos distintos para generar diversos receptores de antígenos. Los vertebrados con mandíbula utilizan la reorganización de segmentos genéticos, mientras que los vertebrados sin mandíbula utilizan módulos de repetición ricos en leucina para receptores de linfocitos variables.

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Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
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T and B Cell Receptor Immune Repertoire Analysis using Next-generation Sequencing
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T and B Cell Receptor Immune Repertoire Analysis using Next-generation Sequencing

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Last Updated: Jun 7, 2026

Generation of Human Alloantigen-specific T Cells from Peripheral Blood
09:47

Generation of Human Alloantigen-specific T Cells from Peripheral Blood

Published on: November 21, 2014

Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
06:15

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Published on: September 7, 2018

T and B Cell Receptor Immune Repertoire Analysis using Next-generation Sequencing
08:59

T and B Cell Receptor Immune Repertoire Analysis using Next-generation Sequencing

Published on: January 12, 2021

Área de la Ciencia:

  • Inmunología Inmunología.
  • Biología evolutiva Biología evolutiva.
  • Genética La genética.

Sus antecedentes:

  • El sistema inmunológico adaptativo, caracterizado por un repertorio diverso de receptores de antígenos en los linfocitos, es un sello distintivo de la evolución de los vertebrados.
  • Este sistema proporciona una ventaja de supervivencia al permitir el reconocimiento y la defensa contra los patógenos.
  • Los vertebrados sin mandíbula (lampreas y hagfish) y los vertebrados con mandíbula exhiben estrategias distintas para generar diversidad de receptores de antígenos.

Objetivo del estudio:

  • Explorar las vías evolutivas de la inmunidad adaptativa en los vertebrados.
  • Para comparar los mecanismos moleculares de la diversificación de los receptores de antígenos en vertebrados con mandíbula y sin mandíbula.
  • Para entender la evolución convergente de los sistemas inmunológicos adaptativos.

Principales métodos:

  • Análisis comparativo de genómica de los genes del sistema inmunológico.
  • Análisis filogenético de la evolución del sistema inmunológico.
  • Caracterización molecular del conjunto de receptores de linfocitos.

Principales resultados:

  • Los vertebrados de mandíbula ensamblan los receptores de antígenos a través de la reorganización recombinatoria de los segmentos de genes de inmunoglobulina y de los receptores de células T.
  • Los vertebrados sin mandíbula generan diversidad de receptores a través del ensamblaje de módulos genéticos de repetición ricos en leucina, que codifican receptores de linfocitos variables.
  • La evolución convergente de estos distintos sistemas inmunes adaptativos implicó la modificación de los componentes inmunes innatos.

Conclusiones:

  • La inmunidad adaptativa de los vertebrados ha evolucionado a través de al menos dos estrategias genéticas independientes para generar diversidad de receptores de antígenos.
  • El estudio destaca mecanismos genéticos innovadores empleados por diferentes linajes de vertebrados para lograr la complejidad del sistema inmunológico.
  • La comprensión de estos caminos evolutivos divergentes proporciona información sobre los principios fundamentales de la adaptación del sistema inmunológico.