A Genomic Gene Encoding the B5 Rabbit Immunoglobulin Kappa Constant Region: Implications for Latent Allotype Phenomenon
Overview
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We previously reported that domestic rabbits of five immunoglobulin kappa allotype strains (b4v, b4, b5, b6, and b9) harbor at least two DNA sequences that hybridize strongly to kappa constant region probes in Southern blots. One of these sequences ("type A") has been identified as encoding the constant region of the kappa 2 isotype, an immunoglobulin chain that most rabbits express only at low levels, if at all. We identified the second sequence--for rabbits of the b4 allotype--as encoding the nominal b4 kappa chain (or kappa 1 isotype), but for rabbits of other allotypes no definite identification for this "type B" sequence could be made. Here we suggest that the type B sequence in rabbits of the other domestic allotypes also encodes the nominal kappa 1 immunoglobulin chain. We show this directly for the b5 allotype; a type B sequence cloned from b5 DNA has been found to contain an apparently functional gene encoding the b5 constant region sequence. Indirect arguments suggest the corresponding conclusion for the b4v, b6, and b9 allotypes. We have considered the implications of these results for the phenomenon of "latent allotype" expression.
An overview of the lagomorph immune system and its genetic diversity.
Pinheiro A, Neves F, de Matos A, Abrantes J, van der Loo W, Mage R Immunogenetics. 2015; 68(2):83-107.
PMID: 26399242 DOI: 10.1007/s00251-015-0868-8.
van der Loo W Genetics. 1993; 135(1):171-87.
PMID: 8224818 PMC: 1205617. DOI: 10.1093/genetics/135.1.171.
van der Loo W, Bouton C, Sanchez M, Mougel F, Castien E, HAMERS R Immunogenetics. 1995; 42(5):333-41.
PMID: 7590966 DOI: 10.1007/BF00179394.
Multiple-alphabet amino acid sequence comparisons of the immunoglobulin kappa-chain constant domain.
Karlin S, Ghandour G Proc Natl Acad Sci U S A. 1985; 82(24):8597-601.
PMID: 3936038 PMC: 390964. DOI: 10.1073/pnas.82.24.8597.
Lamoyi E, MAGE R J Exp Med. 1985; 162(4):1149-60.
PMID: 3930650 PMC: 2187860. DOI: 10.1084/jem.162.4.1149.