Restricted use of VH4 germline segments in an acute multiple sclerosis brain - PubMed (original) (raw)
Comparative Study
Restricted use of VH4 germline segments in an acute multiple sclerosis brain
G P Owens et al. Ann Neurol. 1998 Feb.
Abstract
Multiple sclerosis (MS) cerebrospinal fluid and brain contain increased IgG and oligoclonal bands. Whether this oligoclonal and polyclonal IgG is directed against a disease-relevant antigen remains unknown. To distinguish between random activation versus a targeted B-cell response, we analyzed the IgG heavy chain variable region (VH) repertoire expressed in different lesions of an acute MS brain. To obtain a representative sample of the VH repertoire, we constructed directional complementary DNA libraries from plaque-periplaque messenger RNA and amplified VH regions from the library by nested polymerase chain reaction. When MS VH sequences were aligned to germline segments, about 60% of different VH sequences in the acute MS brain were VH4 germline segments, significantly greater than the known approximately 20% VH4 germline prevalence. Specific VH sequences were overrepresented and expressed at multiple plaque sites. Within some overexpressed populations, there were distinct sequence differences (clonal variants) indicative of clonal expansion. Alignment of VH sequences to their closest germline counterparts revealed extensive somatic mutation and the preferential accumulation of amino acid replacement mutations in complementarity determining regions. These observations suggest the limited B-cell response found in this acute MS brain was antigen driven.
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