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Departments of
*
Neurology and
Microbiology, University of Colorado Health Sciences Center, Denver, CO 80262; and
Department of Immunology, Scripps Research Institute, La Jolla, CA 92037
Single-cell RT-PCR was used to sample CD19+ B cell repertoires in cerebrospinal fluid (CSF) of patients with multiple sclerosis (MS) or viral meningitis. Analysis of amplified Ab H and L chain products served to identify the rearranged germline segment and J segment, and to determine the degree of homology for the H and L chain sequence of individual B cells. The B cell repertoire of viral meningitis CSF was predominately polyclonal, whereas B cell clonal expansion was a prominent feature of the IgG repertoire in three of four MS patients. Two dominant clonal populations in one MS CSF accounted for
70% of the IgG H chain V regions sequenced, while the corresponding IgM repertoires were more heterogeneous. One clonal B cell population revealed multiple L chain rearrangements, raising the possibility of a role for receptor editing in shaping the B cell response in some MS patients. The most immediate implications of identifying rearranged Ig sequences in MS B cells is the potential to accurately recreate recombinant Abs from these overrepresented H and L chains that can be used to discover the relevant Ag(s) in MS.
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