ArticleMarine biotechnology (New York, N.Y.)2023
Genome-Wide Analysis of Family I84 Protease Inhibitor Genes in Three Bivalves Reveals Important Information About the Protein Family's Evolution.
Article in Marine biotechnology (New York, N.Y.), 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Family I84 serine protease inhibitors are believed to be mollusk specific proteins involved in host defense. The molecular evolution of the family, however, remains to be understood. In this study, the genes of Family I84 protease inhibitors in 3 bivalves, Crassostrea gigas, Crassostrea virginica and Tegillarca granosa, were analyzed at the genomic level. A total of 66 Family I84 genes (22 in C. gigas, 28 in C. virginica and 16 in T. granosa) were identified from the 3 species. They distributed unevenly in the genomes involving 4 chromosomes in C. gigas and 5 chromosomes in C. virginica and T. granosa and some genes were tandemly duplicated. Most genes had 3 exons with 12 genes having 4 exons and 1 gene having 2 exons. All genes but 1 from C. gigas and 1 from T. granosa encoded peptides with a signal sequence at the N-terminus, and the properties of the predicted mature molecules were similar. Four conserved motifs were identified in the 66 amino acid sequences. Collinear analysis revealed higher collinearity between the 2 oyster species in general genes and in Family I84 genes. Phylogenetic analysis of the 66 genes with those previously reported from 3 other bivalves and 1 gastropod showed that Family I84 protease inhibitor genes from the same species tended to be grouped together in terminal branches of the constructed Maximum likelihood tree, but most internal nodes were poorly supported by the bootstrap values. In addition, differences in expression patterns between the genes of a same species were observed in the developmental stages and tissues of C. gigas and T. granosa. Moreover, the co-expression of genes within Family I84 and Family I84 genes with non-Family I84 were also detected in C. gigas and T. granosa. These results suggested that Family I84 protease inhibitor genes evolved by active duplications and structural and functional diversifications after the speciation of related mollusks, and the diversified protease inhibitor family was likely multifunctional.
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