Abstract
Claudins are a family of integrated membrane-bound proteins involving in paracellular tightness, barrier forming, ion permeability, and substrate selection at tight junctions of chordate epithelial and endothelial cells. Here, 39 putative claudin genes were identified in the Pungitius sinensis based on the high throughput RNA-seq. Conservative motif distribution in each group suggested functional relevance. Divergence of duplicated genes implied the species’ adaptation to the environment. In addition, selective pressure analyses identified one site, which may accelerate functional divergence in this protein family. Pesticides cause environmental pollution and have a serious impact on aquatic organisms when entering the water. The expression pattern of most claudin genes was affected by organophosphorus pesticide, indicating that they may be involved in the immune regulation of organisms and the detoxification of xenobiotics. Protein–protein network analyses also exhibited 439 interactions, which implied the functional diversity. It will provide some references for the functional study on claudin genes.
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Abbreviations
- HMM:
-
Hidden Markov model
- JTT:
-
Jones–Taylor–Thornton
- Ka:
-
Non-synonymous rate of nucleotide substitution
- Ks:
-
Synonymous rate of nucleotide substitution
- ML:
-
Maximum likelihood
- NJ:
-
Neighbor-joining
- OP:
-
Organophosphorus pesticide
- TJ:
-
Tight junction
- TM:
-
Transmembrane helixe
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The research was funded by Jiangsu University “Youth Backbone Teacher Training Project”.
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The research was funded by Jiangsu University “Youth Backbone Teacher Training Project”.
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Conceptualization was carried out by J.C.; Methodology was carried out by J.C. and X.C.; Validation was done by J.C.; Formal analysis was done by J.C. Resources were carried out by J.C. and X.C.; Writing—original draft preparation was done by J.C.; Writing—review and editing was done by J.C. and X.C.; Project administration was done by J.C.; Funding acquisition was carried out by J.C.
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Fig. S1. Motif and variation patterns among claudin proteins. The height of a letter indicates its Motif and variation patterns among claudin proteins. (PPT 322 kb)
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Cao, J., Cheng, X. Characterization and molecular evolution of claudin genes in the Pungitius sinensis. J Comp Physiol B 190, 749–759 (2020). https://doi.org/10.1007/s00360-020-01301-5
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DOI: https://doi.org/10.1007/s00360-020-01301-5