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Human autoantibodies and their genes

¹Institut Pasteur, Immunogénétique Cellulaire, Paris, France.

Applied Biochemistry and Biotechnology

|May 1, 1994

Summary

Systemic lupus erythematosus (SLE) autoantibodies are not caused by major B cell gene abnormalities. Instead, a two-stage process involving B cell activation and expansion likely drives autoantibody production in lupus.

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Area of Science:

Immunology
Genetics

Background:

Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by autoantibodies.
The B cell repertoire, encompassing germline and somatic levels, is central to antibody production.

Purpose of the Study:

To investigate the germline and somatic B cell repertoire in SLE patients.
To determine if major abnormalities in immunoglobulin heavy (IgH-V) and immunoglobulin kappa (IgK-V) loci contribute to SLE pathogenesis.

Main Methods:

Analysis of the B cell repertoire at germline and somatic levels.
Characterization of human V gene segments using endonuclease-generated polymorphisms in SLE patients.

Main Results:

No major abnormalities were found in the structure, size, or organization of the IgV loci in SLE.
The findings suggest that the genetic basis of SLE does not lie in gross alterations of these immunoglobulin loci.

Conclusions:

Major structural abnormalities of IgH-V and IgK-V loci are unlikely to be the primary cause of SLE.
Autoantibody hyperproduction in SLE may result from a two-stage mechanism: general B cell activation followed by clonal expansion.

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