Immunoglobulin light chain class multiplicity and alternative organizational forms in early vertebrate phylogeny

Immunogenetics - Tập 40 - Trang 83-99 - 1994
Jonathan P. Rast1, Michele K. Anderson1, Ronda T. Litman1, M. Margittai1, Gary W. Litman1, Tatsuya Ota2, Michael J. Shamblott3
1All Children's Hospital, University of South Florida, St. Petersburg, USA
2Institute of Molecular Evolutionary Genetics, The Pennsylvania State University, University Park, USA
3Center of Marine Biotechnology, University of Maryland, Baltimore, USA

Tóm tắt

The prototypic chondrichthyan immunoglobulin (Ig) light chain type (type I) isolated from Heterodontus francisci (horned shark) has a clustered organization in which variable (V), joining (J), and constant (C) elements are in relatively close linkage (V-J-C). Using a polymerase chain reaction-based approach on a light chain peptide sequence from the holocephalan, Hydrolagus colliei (spotted ratfish), it was possible to isolate members of a second light chain gene family. A probe to this light chain (type II) detects homologs in two orders of elasmobranchs, Heterodontus, a galeomorph and Raja erinacea (little skate), a batoid, suggesting that this light chain type may be present throughout the cartilaginous fishes. In all cases, V, J, and C regions of the type II gene are arranged in closely linked clusters typical of all known Ig genes in cartilaginous fishes. All representatives of this type II gene family are joined in the germline. A third (kappa-like) light chain type from Heterodontus is described. These findings establish that a degree of light chain class complexity comparable to that of the mammals is present in the most phylogenetically distant extant jawed vertebrates and that the phenomenon of germline-joined (pre-rearranged) genes, described originally in the heavy chain genes of cartilaginous fishes, extends to light chain genes.

Tài liệu tham khảo

Dariavach, P., Lefranc, G., and Lefranc, M.-P. Human immunoglobulin C-λ-6 gene encodes theKern+Oz-λ chain and C-λ-4 and C-λ-5 are pseudogenes. Proc Natl Acad Sci USA 84: 9074–9078, 1987

Komori, S., Yamasaki, N., Shigeta, M., Isojima, S., and Watanabe, T. Production of heavy-chain class switch variants of human monoclonal antibody by reconmbinant DNA technology. Clin Exp Immunol 71: 508–516, 1988

Lawler, A. M., Kearney, J. F., Kuehl, M., and Gearhart, P. J. Early rearrangements of genes encoding heavy chains, use variable gene segments dispersed throughout the locus. Proc Natl Acad Sci USA 86: 6744–6748, 1989

Pech, M. and Zachau, H. G. Immunoglobulin genes of different subgroups are within the VK locus. Nucleic Acids Res 12: 9229–9236, 1984

Straubringer, B., Huber, E., Lorenz, W., Osterholzer, E., Pargent, W., Pech, M., Pohlenz, H.-D., Zimmer, F.-J., and Zachau, H. G. The human VK locus: characterization of a duplicated region encoding 28 different immunoglobulin genes. J Mol Biol 199: 23–34, 1988