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The complexity of expressed kappa light chains in egg-laying mammals

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Abstract

Complementary DNAs encoding immunoglobulin light chains were isolated from two monotreme species, Ornithorhynchus anatinus (duckbill platypus) and Tachyglossus aculeatus (echidna). The sequences of both the variable and constant regions of these clones had greater similarity to IGK than to other light chain classes and phylogenetic analyses place them squarely within the mammalian IGK group, establishing them as monotreme IGK homologues. The constant region sequences of all clones were essentially identical within each species and, along with Southern blot results, the data are consistent with a single IGKC in each species. The expressed IGKV repertoires from both platypus and echidna were randomly sampled and there appear to be at least four platypus and at least nine echidna IGKV subgroups. The IGKV subgroups are highly divergent within species, in some cases sharing as little as 57% nucleotide identity. Two of the IGKV subgroups are present in both species, so there is some degree of overlap in the germline repertoires of these two monotremes. Overall the complexity seen in platypus and echidna IGK light chains is comparable with that of other mammals considered to have high levels of germline diversity and is in contrast to what has been found so far for monotreme IGL.

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Acknowledgements

The work reported was supported by the National Science Foundation (MCB-9981960 to R.D.M.) and the Swedish Natural Sciences Research Council (L.H.).

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Authors and Affiliations

  1. Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA

    Melissa A. Nowak, Zuly E. Parra & Robert D. Miller

  2. Department of Cell and Molecular Biology, Uppsala University, 75124, Uppsala, Sweden

    Lars Hellman

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  1. Melissa A. Nowak
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  2. Zuly E. Parra
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  3. Lars Hellman
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  4. Robert D. Miller
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Correspondence to Robert D. Miller.

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Nowak, M.A., Parra, Z.E., Hellman, L. et al. The complexity of expressed kappa light chains in egg-laying mammals. Immunogenetics 56, 555–563 (2004). https://doi.org/10.1007/s00251-004-0720-z

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  • DOI: https://doi.org/10.1007/s00251-004-0720-z

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