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Disorders of Leukocytes01:27

Disorders of Leukocytes

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Leukocyte disorders can lead to either leukopenia, characterized by an abnormally low leukocyte count, or leukocytosis, marked by a very high leukocyte number.
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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...
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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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.
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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.
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Separation of Immune Cell Subpopulations in Peripheral Blood Samples from Children with Infectious Mononucleosis
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B Cell Disorders in Children: Part II.

Dixie D Griffin1, William K Dolen2

  • 1Department of Pediatrics, Allergy-Immunology and Pediatric Rheumatology Division,, Medical College of Georgia at Augusta University, 1120 15th Street, Augusta, GA, 30912, USA.

Current Allergy and Asthma Reports
|August 22, 2020
PubMed
Summary
This summary is machine-generated.

This review details rare B cell disorders and their genetic causes. Genetic testing aids in precise classification and diagnosis of these rare immune system conditions.

Keywords:
APDSAntibody deficiencyB cell disordersBLKCTLA-4Good syndromeHyper IgM syndromeIgG subclass deficiencyKabuki syndromeSelective IgA deficiencySpecific antibody deficiencyTWEAK

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Area of Science:

  • Immunology
  • Genetics
  • Rare Diseases

Background:

  • B cell disorders are characterized by reduced immunoglobulin levels or function.
  • Genetic mutations are implicated in various B cell disorders.
  • This review builds upon prior research in the field.

Purpose of the Study:

  • To describe rare B cell disorders.
  • To outline the known genetic etiologies of these disorders.
  • To enhance understanding of B cell development and function.

Main Methods:

  • Literature review of rare B cell disorders.
  • Analysis of genetic studies and their findings.
  • Synthesis of information on genetic etiologies.

Main Results:

  • An increasing number of B cell disorders are being identified and precisely classified through genetic studies.
  • Beyond X-linked agammaglobulinemia and common variable immunodeficiency (CVID), numerous other causes of hypogammaglobulinemia exist.
  • Genetic testing is crucial for specific diagnoses and identifying novel B cell disorders.

Conclusions:

  • Genetic studies are vital for classifying B cell disorders and understanding B cell biology.
  • Genetic testing offers diagnostic clarity, aids in genetic counseling, and reveals new B cell disorders.
  • Precise classification of rare B cell disorders is advancing through genetic research.