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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Deficiencies in the CD19 complex.

Marjolein W J Wentink1, Menno C van Zelm2, Jacques J M van Dongen3

  • 1Dept. of Immunology, Erasmus MC, Rotterdam, the Netherlands.

Clinical Immunology (Orlando, Fla.)
|August 4, 2018
PubMed
Summary

Deficiencies in the CD19-complex disrupt B-cell development, leading to antibody deficiencies. While mutations in different CD19-complex members cause similar diseases, distinct clinical phenotypes arise from each protein

Keywords:
B-cell receptor co-complexCD19CD21CD81Primary antibody deficiencies

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • The CD19-complex (CD19, CD81, CD21, CD225) is crucial for B-cell development, differentiation, and maturation.
  • Each component of the CD19-complex plays a unique role in immune signaling.
  • Antibody deficiencies linked to CD19-complex dysfunction have been observed in 15 patients over the last decade.

Purpose of the Study:

  • To consolidate knowledge on the functions of individual CD19-complex members.
  • To review findings from mouse models investigating CD19-complex proteins.
  • To summarize the clinical presentations of patients with CD19-complex deficiencies.

Main Methods:

  • Literature review of CD19-complex function.
  • Analysis of existing mouse study data.
  • Compilation of clinical data from 15 patients with CD19-complex deficiencies.

Main Results:

  • Mutations in CD19-complex members, whether homozygous or compound heterozygous, result in antibody deficiencies.
  • Despite a shared underlying mechanism, distinct clinical phenotypes are observed depending on the specific deficient protein.
  • Mouse studies provide insights into the specific roles of CD19-complex components.

Conclusions:

  • Understanding the distinct functions of CD19-complex members is key to interpreting varied clinical outcomes.
  • The CD19-complex's intricate roles explain why deficiencies in its components lead to both shared and unique disease phenotypes.
  • Further research combining functional and clinical data can elucidate the precise impact of each CD19-complex member on B-cell immunity.