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Defective B cell development and function in Btk-deficient mice

W N Khan1, F W Alt, R M Gerstein

  • 1Howard Hughes Medical Institute, Childrens Hospital, Boston, Massachusetts 02115, USA.

Immunity
|September 1, 1995
PubMed
Summary
This summary is machine-generated.

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Mutations in Bruton's tyrosine kinase (Btk) eliminate Btk protein, causing X-linked immune deficiency (Xid) in mice. This study confirms Btk's crucial role in B cell development and function.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Mutations in Bruton's tyrosine kinase (Btk) cause X-linked agammaglobulinemia (XLA) in humans and X-linked immune deficiency (Xid) in mice.
  • Btk's precise functions in murine B cell development remain incompletely understood.

Purpose of the Study:

  • To definitively elucidate the role of Btk in murine B cell development and function.
  • To generate and analyze mice with targeted Btk gene mutations.

Main Methods:

  • Generated embryonic stem cells with mutations ablating Btk pleckstrin homology or kinase domains.
  • Assayed mutant Btk function using RAG2-deficient blastocyst complementation and germline transmission.
  • Analyzed B cell populations, serum immunoglobulin levels, and immune responses in mutant mice.

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Main Results:

  • Btk protein expression was blocked in mutant mice.
  • Reduced mature B cells, severe B1 cell deficiency, and deficiencies in IgM and IgG3 were observed.
  • Defective in vitro B cell activation and in vivo responses to thymus-independent antigens occurred.

Conclusions:

  • Lack of Btk function unequivocally results in the Xid phenotype in mice.
  • Btk plays a differential role in murine versus human B lymphocyte development.