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Distribution and Association of Heavy and Light Chain Variable Region Subgroups among Human IgA Immunoglobulins

J. Donald Capra and J. Michael Kehoe
J Immunol February 1, 1975, 114 (2 Part 1) 678-681;
J. Donald Capra
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J. Michael Kehoe
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Abstract

A series of randomly selected human IgA myeloma proteins were examined for the presence of the VHIII subgroup, as defined by the possession of an unblocked amino terminal amino acid and characteristic linked residues along the heavy chain. Blocked heavy chains were classified as VHB proteins. The data showed that 20 of 30 such random alpha chains (67%) were classifiable as members of the VHIII subgroup. Similarly, 75% of heavy chains isolated from pools of normal serum IgA contained a VHIII variable region. The pattern stands in marked contrast to the situation in human IgG proteins where approximately 20% of heavy chains from both pools and myeloma proteins are VHIII. There was thus a clear divergence of the pattern of variable region: constant region association between these two classes of immunoglobulin.

Some more limited data were obtainable for the light chains of the IgA myeloma proteins. Certain predilections for light chain subgroup:heavy chain subgroup (VHIII or VHB) associations were discernable, but more data are required for definite conclusions.

Overall, this study suggests that although the pool of available variable region sequences is indeed shared among human IgA and IgG proteins, the partitioning is not exactly equivalent between the two immunoglobulin classes. The pattern is particularly apparent at present for the VHIII subgroup which comprises approximately 70% of human alpha chains and only about 20% of human gamma chains.

Footnotes

  • ↵2 Recipient of National Institutes of Health Career Development Award 6-K4-GM-35.

  • ↵3 Established Investigator of the American Heart Association.

  • ↵1 This work was aided by grants from the National Science Foundation (GB 17046) and the United States Public Health Service (AI 09810) and a Grant-in-Aid from the New York Heart Association.

  • Received June 14, 1974.
  • Copyright © 1975 by The American Association of Immunologists, Inc.

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The Journal of Immunology
Vol. 114, Issue 2 Part 1
1 Feb 1975
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Distribution and Association of Heavy and Light Chain Variable Region Subgroups among Human IgA Immunoglobulins
J. Donald Capra, J. Michael Kehoe
The Journal of Immunology February 1, 1975, 114 (2 Part 1) 678-681;

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Distribution and Association of Heavy and Light Chain Variable Region Subgroups among Human IgA Immunoglobulins
J. Donald Capra, J. Michael Kehoe
The Journal of Immunology February 1, 1975, 114 (2 Part 1) 678-681;
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Print ISSN 0022-1767        Online ISSN 1550-6606