Abstract
Circadian rhythms underlie diverse life functions ranging from cellular activities to behavior. Multiple clock genes play a central role in the generation of these rhythms. We partially characterized two copies of the Clock gene from Chinook salmon (Oncorhynchus tshawytscha), OtsClock1a and OtsClock1b. The 6,460 bp OtsClock1a sequence contains 16 exons, 15 introns and encompasses three highly conserved domains indicating it is a novel member of the bHLH-PAS superfamily of transcription factors. The second copy, OtsClock1b, consists of five exons and five introns spanning 1,945 bp. A polyglutamine repeat motif (PolyQ), characteristic of a majority of CLOCK proteins, is present in both OTSCLOCK1a and OTSCLOCK1b. However, the Chinook PolyQ domains are uniquely positioned inside the gene. Interestingly, a 1,200 bp non-coding segment located downstream of the OtsClock1a PolyQ domain is absent from OtsClock1b. This insertion/deletion is 91% similar to the Salmo salar Transferrin gene. A phylogenetic analysis of 11 CLOCK proteins shows that OtsClock1a and OtsClock1b are paralogs which likely arose subsequent to the salmonid genome-wide duplication event. Ultimately, the Chinook salmon Clock genes are key components to our understanding the genetic mechanisms underlying temporally regulated life history traits in Pacific salmonids.
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Acknowledgements
This research was supported by the California Department of Water Resources and the Mamie M. Markham Research Grant. We are grateful to M. Camara and G. Moyer for comments that considerably improved the manuscript and I. Meusnier for help with mRNA sampling and screening the BAC library. We thank B. Devlin of the Department of Fisheries and Oceans, British Columbia, Canada for providing reagents, laboratory equipment, and technical support to probe the Chinook salmon BAC library.
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O’Malley, K.G., Banks, M.A. Duplicated Clock genes with unique polyglutamine domains provide evidence for nonhomologous recombination in Chinook salmon (Oncorhynchus tshawytscha). Genetica 132, 87–94 (2008). https://doi.org/10.1007/s10709-007-9151-8
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DOI: https://doi.org/10.1007/s10709-007-9151-8