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Related Concept Videos

Immunodeficiency Diseases01:25

Immunodeficiency Diseases

Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency disorders...
Development of Immunocompetence01:22

Development of Immunocompetence

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...
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,...
Primary Lymphoid Organs01:16

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview

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Related Experiment Video

Updated: Jun 17, 2026

Simultaneous Quantification of T-Cell Receptor Excision Circles (TRECs) and K-Deleting Recombination Excision Circles (KRECs) by Real-time PCR
14:14

Simultaneous Quantification of T-Cell Receptor Excision Circles (TRECs) and K-Deleting Recombination Excision Circles (KRECs) by Real-time PCR

Published on: December 6, 2014

Primary immunodeficiencies: 2009 update.

1, Luigi D Notarangelo, Alain Fischer

  • 1Division of Immunology, Children's Hospital Boston and Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA. luigi.notarangelo@childrens.harvard.edu

The Journal of Allergy and Clinical Immunology
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

This report updates the classification of human primary immunodeficiencies (PIDs), revealing new molecular and cellular mechanisms. Early diagnosis and recognition of these PIDs are crucial for effective treatment and improved patient outcomes.

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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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Generation of Immature, Mature and Tolerogenic Dendritic Cells with Differing Metabolic Phenotypes
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Generation of Immature, Mature and Tolerogenic Dendritic Cells with Differing Metabolic Phenotypes

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Published on: June 22, 2016

Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Primary immunodeficiencies (PIDs) represent a diverse group of genetic disorders affecting the human immune system.
  • Over 50 years since the discovery of congenital agammaglobulinemia, research continues to uncover novel immune system mechanisms.
  • The International Union of Immunological Societies (IUIS) Expert Committee on Primary Immunodeficiencies regularly updates PID classifications.

Purpose of the Study:

  • To present the updated classification of human primary immunodeficiencies (PIDs) as of June 2009.
  • To highlight newly discovered PID forms and their underlying pathophysiology.
  • To emphasize the importance of timely diagnosis for patient management.

Main Methods:

  • Compilation of data by the IUIS Expert Committee on Primary Immunodeficiencies.
  • Review of recent discoveries in PID research.
  • Analysis of molecular and cellular mechanisms governing immune system development and function.

Main Results:

  • An updated classification of PIDs reflecting recent scientific advancements.
  • Identification of novel forms of PID and their associated pathophysiology.
  • Recognition of evolving understanding of immune system disorders.

Conclusions:

  • The classification of PIDs is a dynamic field requiring continuous updates.
  • Understanding novel PID mechanisms is key to improving patient survival and quality of life.
  • Prompt recognition and analysis of PIDs are essential for effective therapeutic strategies.