Abstract
Using degenerate primers based on published β2-microglobulin sequences we were able to obtain an expected 111 base pairs (bp) polymerase chain reaction (PCR) fragment from tilapia genomic DNA. The sequence of this fragment showed a high degree of similarity to mouse β2-microglobulin at the protein level. We used these primers in an “anchored PCR” to obtain a 213 bp PCR fragment from a carp cDNA library. This was then used to clone a full-length β2-microglobulin cDNA from carp. The carp sequence showed the highest similarity to rabbit β2-microglobulin. Both sequences showed strong similarities to all previously published vertebrate β2-microglobulin sequences. The predicted protein secondary structure of both the carp and tilapia clones was almost identical to the corresponding regions of previously known vertebrate β2-microglobulin protein sequences. When either the carp or tilapia probes were used against corresponding northern blots, they hybridized to a message of approximately 800–1000 bases long, which corresponds to the previously published lengths of β2-microglobulin mRNAs. Southern blotting indicated that β2-microglobulin was encoded by a single copy gene in both cases. Phylogenetic analysis indicated that the sequences were related to the β2-microglobulins of higher vertebrates but grouped together in an ancestral position.
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The nucleotide sequence data reported in this paper have been submitted to the GenBank nucleotide sequence database and have been assigned the accession numbers L05536 (carp), L05537 (tilapia).
Correspondence to: B. Pohajdak.
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Dixon, B., Stet, R.J.M., van Erp, S.H.M. et al. Characterization of β2-microglobulin transcripts from two teleost species. Immunogenetics 38, 27–34 (1993). https://doi.org/10.1007/BF00216387
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DOI: https://doi.org/10.1007/BF00216387