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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.
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Simultaneous Quantification of T-Cell Receptor Excision Circles (TRECs) and K-Deleting Recombination Excision Circles (KRECs) by Real-time PCR
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Published on: December 6, 2014

RAG-dependent primary immunodeficiencies.

Cristina Sobacchi1, Veronica Marrella, Francesca Rucci

  • 1Istituto di Tecnologie Biomediche, Segrate, Milan, Italy.

Human Mutation
|September 9, 2006
PubMed
Summary

Mutations in recombination activating genes (RAG1/RAG2) cause severe immunodeficiencies. Environmental factors also influence disease presentation, but underlying mechanisms require further study, potentially using mouse models.

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Published on: November 21, 2018

Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Mutations in recombination activating genes (RAG1 and RAG2) lead to severe immunodeficiencies like T cell-B cell-severe combined immunodeficiency (T(-)B(-)SCID) and Omenn syndrome (OS).
  • The specific genetic defect is a primary determinant of clinical presentation.
  • Environmental factors are increasingly recognized as influencing phenotypic expression, but the mechanisms are not fully understood.

Purpose of the Study:

  • To investigate the mechanisms linking molecular defects in RAG genes to the cellular phenotype of Omenn syndrome (OS).
  • To explore the role of environmental factors in modulating the clinical presentation of RAG-mediated immunodeficiencies.

Main Methods:

  • Analysis of genetic defects in RAG1 and RAG2.
  • Biochemical and cellular assays to understand molecular mechanisms.
  • Utilizing knock-in mouse models to study genotype-phenotype correlations and environmental influences.

Main Results:

  • Established that specific RAG gene defects dictate the initial clinical presentation.
  • Identified evidence suggesting environmental factors modify the phenotype of given genotypes.
  • Highlighted a gap in understanding how molecular defects translate to cellular phenotypes in OS.

Conclusions:

  • RAG1/RAG2 mutations are key drivers of severe immunodeficiencies with diverse clinical outcomes.
  • Environmental factors play a significant role in shaping the phenotype of RAG-deficient immunodeficiencies.
  • Further research, particularly in mouse models, is crucial for elucidating the cellular mechanisms underlying Omenn syndrome and other RAG-related disorders.