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Immunoglobulin concentration in atlantic cod gadus morhua l. serum and cross reactivity between anti cod antibodies and immunoglobulins from other species

Israelsson, O.; Petersson, A.; Bengten, E.; Wiersma, E.J.; Andersson, J.; Gezelius, G.; Pilstrom, L.

Journal of Fish Biology 39(2): 265-278

1991

ISSN/ISBN: 0022-1112
DOI: 10.1111/j.1095-8649.1991.tb04361.x
Accession: 007428159
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The immunoglobulin (Ig) level in serum from Atlantic cod, Gadus morhua L. (Teleostomi, Gadiformes), was measured using ELISA. Cod serum contains 5.62 .+-. 0.19 mg Ig ml-1,which constitute 17.2% of the total serum proteins. Polyclonal and monoclonal antibodies (Ab) against cod-Ig were used for cross-reactivity studies in sera from other species. The cross-reaction with polyclonal Ab was high in gadiform fish, and low or absent in the other tested species. Immunoprecipitation showed that the Ab only binds to the Ig of the serum from the other species. The results within the gadiform group indicate that (1) Gadidae and Lotidae are more closely related to each other than to Merluccidae, (2) Phycidae is more distantly related to Lotidae than earlier considered, (3) Zoarcidae seem to be more distantly related to Gadus than other species of Gadiformes. These results support recent revisions of the systematics of Gadiformes. Monoclonal Ab against the heavy chain of cod-Ig show no, or small (< 15%) cross-reactions with serum from gadiform species. One monoclonal Ab against the light chain shows high cross-reaction and also binds to Ig from species outside the Gadiformes, indicating that the light chain of Ig might be more conserved than the heavy chain.

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Related References

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