Related Experiment Video
Updated: Aug 7, 2026
05:03
Accessing Early Differentiation of Virus-Specific Follicular Helper CD4+ T Cell in Acute LCMV-Infected Mice
Published on: April 26, 2024
Monogenetic defects in common variable immunodeficiency: what can we learn about terminal B cell differentiation?
Ulrich Salzer1, Bodo Grimbacher
1Clinical Immunology and Rheumatology, Medical Center, University of Freiburg, Freiburg, Germany.
Current Opinion in Rheumatology
|June 10, 2006
Summary
Genetic defects in common variable immunodeficiency (CVID) are emerging, revealing a complex background. Impaired B cell differentiation is key to CVID pathogenesis, requiring further genetic and phenotypic analysis.
Area of Science:
- Immunology
- Genetics
- Molecular Biology
Background:
- Over 100 genetic defects cause primary immunodeficiencies.
- Common variable immunodeficiency (CVID) is the most prevalent primary immunodeficiency requiring medical attention.
- The genetic cause of CVID remained undefined until recently.
Purpose of the Study:
- To summarize molecular genetics progress in CVID.
- To contextualize CVID genetic findings with broader field developments.
Main Methods:
- Review of recent genetic discoveries in CVID.
- Analysis of genetic defects in inducible costimulator, TACI, and CD19.
- Exploration of epigenetic factors and B cell differentiation.
Main Results:
- First monogenetic defects identified in CVID patients (inducible costimulator, TACI, CD19).
- Multifaceted genetic background for CVID revealed.
- Low IgM memory B cells linked to increased infections; HHV-8 identified as a risk factor for granulomatous disease.
Conclusions:
- CVID pathogenesis converges on impaired terminal B cell differentiation.
- Newly discovered genetic defects support impaired B cell differentiation.
- Combined genetic analysis and standardized phenotyping are crucial for understanding CVID.
More Related Videos
Related Concept Videos
01:25Immunodeficiency 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...
There are three main causes of immunodeficiency disorders...
01:24B 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...
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...
01:15Differentiation of Common Myeloid Progenitor Cells
Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
01:23Cells 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...
01:22T Cell Activation and Clonal Selection
T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Naive T cells that have not yet encountered an antigen express two primary CD...
01:20Special 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,...
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,...