Abstract：
:We have sequenced the variable heavy chain regions of a number of VH4-21 encoded monoclonal IgM anti-Rh(D) antibodies produced in response to deliberate immunization. These were compared with the sequences of similarly encoded IgM anti-I cold agglutinins (CA) derived from patients with lympho-proliferative diseases. The anti-Rh(D) antibodies show evidence of clonal expansion and somatic diversification. Even though they are produced in response to an antigenic stimulus, they demonstrate limited hypermutation in the variable heavy chain (VH) segments and there is no evidence of selective pressure acting on the complementarity determining regions (CDRs). The CA demonstrate a higher rate of mutation and yet this results in a lower ratio of replacement to silent mutations (R:S) in the CDRs than seen in the anti-Rh(D) antibodies. It is not clear whether the different pattern of mutations seen in the CA is related to their auto-reactivity or their tumour origin. In both groups of antibodies the region encoded by the VH4-21 segment can be found in germline configuration at the amino-acid level indicating that other V-gene structures, i.e. light chains or CDRH3s, are crucial to the generation of either specificity. A role of the CDRH3 is indicated by the identification of a motif shared by four CAs and one Rh(D) antibody which also demonstrates CA activity independent of its anti-Rh(D) specificity. Amongst the anti-Rh(D) antibodies there seems to be an obligatory combination with VL having closest homology to the DPL16 germline segment indicating this as particularly important in generation anti-Rh(D) specificity.
journal_name
Scand J Immunoljournal_title
Scandinavian journal of immunologyauthors
Børretzen M,Chapman C,Stevenson FK,Natvig JB,Thompson KMdoi
10.1111/j.1365-3083.1995.tb03630.xsubject
Has Abstractpub_date
1995-07-01 00:00:00pages
90-7issue
1eissn
0300-9475issn
1365-3083journal_volume
42pub_type
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journal_title：Scandinavian journal of immunology
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