Abstract
Bitter taste perception is important for vertebrates to select food and avoid toxic substances. A large number of Tas2r genes have been identified from vertebrate species previously; however, few studies have been conducted on the Tas2r genes of Ovalentaria species that have various dietary niches and are widely distributed, ranging from the sea to freshwater environments. Several genomes of Ovalentaria species have been released recently, allowing us to study Tas2r genes in these fishes. Thus, we explored the genomes of these fishes and identified 34 Tas2r genes in 21 species, including 27 intact Tas2r genes and seven pseudogenes. The results suggest that Ovalentaria species generally carry a small repertoire of Tas2r genes. To determine the phylogenetic relationship of Tas2r genes among 21 fishes, we constructed neighbor-joining (NJ) trees. The results showed that gene duplication may not occur in these fishes. Phylogenetic independent contrast (PIC) analysis showed that the fish Tas2r gene repertoire size was not positively correlated with diet, indicating that the food swallowing behavior might reduce the importance of bitter taste sense.
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Abbreviations
- Tas2r:
-
Bitter taste receptor
- NJ:
-
Neighbor-joining
- PIC:
-
Phylogenetically independent contrasts
- Calhm1:
-
calcium homeostasis modulator 1
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Acknowledgements
This work was supported by the Special Fund for Forest Scientific Research in the Public Welfare (NO. 201404420), the National Natural Science Fund of China (NO. 31372220, 31672313). The data is obtained from the NCBI database, thus no Ethics Committees are needed in this research.
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Shang, S., Zhang, H., Wu, X. et al. The repertoire of bitter taste receptor genes in Ovalentaria fish. Environ Biol Fish 100, 1489–1496 (2017). https://doi.org/10.1007/s10641-017-0659-1
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DOI: https://doi.org/10.1007/s10641-017-0659-1