ArticleBMC plant biology2014
Soybean (Glycine max) expansin gene superfamily origins: segmental and tandem duplication events followed by divergent selection among subfamilies.
Article in BMC plant biology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 158 papers.
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158 citing papers in PubMed.
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- Characterization of histone acetyltransferase and histone deacetylase genes under abiotic and hormone stresses in soybean.Frontiers in plant science · 2026Article
- Multi-omics reveals growth regulatory mechanisms induced by exogenous TgSWO expansin-like protein in strawberry.Frontiers in plant science · 2026Article
- Comprehensive genomic analysis of the expansin gene family in pecan (Carya illinoinensis) and their transcriptional responses to stresses and fruit abscission.BMC plant biology · 2025Article
- Genome-wide identification of the PLD gene family and its response to multiple abiotic stresses in soybean (Glycine max).BMC plant biology · 2025Article
- Genome-wide analysis and functional validation of the GH1 gene family in cotton under salt stress.Functional & integrative genomics · 2025Article
- Overexpression of the Wild Soybean Expansin GenePlants (Basel, Switzerland) · 2025Article
- Genomic Features and Predicted 3D Structures of the CcWOX Transcription Factors inInternational journal of molecular sciences · 2025Article
- Genome-Wide Analysis of the Maize LBD Gene Family Reveals a Role forPlants (Basel, Switzerland) · 2025Article
- Comprehensive identification, stress responses and protein-protein interactions of the ferredoxin gene family in the fast-growing tree species Paulownia fortunei.BMC plant biology · 2025Article
- Genome-Wide Characterization of the Phosphofructokinase Gene Family inInternational journal of molecular sciences · 2025Article
- Genome-wide identification, characterization and expression analysis of CNGC Genes in moso bamboo (Phyllostachys edulis).BMC plant biology · 2025Article
98 more citing papers are in PubMed but not listed here.
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7 authors.
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Abstract
backgroundExpansins are plant cell wall loosening proteins that are involved in cell enlargement and a variety of other developmental processes. The expansin superfamily contains four subfamilies; namely, α-expansin (EXPA), β-expansin (EXPB), expansin-like A (EXLA), and expansin-like B (EXLB). Although the genome sequencing of soybeans is complete, our knowledge about the pattern of expansion and evolutionary history of soybean expansin genes remains limited.
resultsA total of 75 expansin genes were identified in the soybean genome, and grouped into four subfamilies based on their phylogenetic relationships. Structural analysis revealed that the expansin genes are conserved in each subfamily, but are divergent among subfamilies. Furthermore, in soybean and Arabidopsis, the expansin gene family has been mainly expanded through tandem and segmental duplications; however, in rice, segmental duplication appears to be the dominant process that generates this superfamily. The transcriptome atlas revealed notable differential expression in either transcript abundance or expression patterns under normal growth conditions. This finding was consistent with the differential distribution of the cis-elements in the promoter region, and indicated wide functional divergence in this superfamily. Moreover, some critical amino acids that contribute to functional divergence and positive selection were detected. Finally, site model and branch-site model analysis of positive selection indicated that the soybean expansin gene superfamily is under strong positive selection, and that divergent selection constraints might have influenced the evolution of the four subfamilies.
conclusionThis study demonstrated that the soybean expansin gene superfamily has expanded through tandem and segmental duplication. Differential expression indicated wide functional divergence in this superfamily. Furthermore, positive selection analysis revealed that divergent selection constraints might have influenced the evolution of the four subfamilies. In conclusion, the results of this study contribute novel detailed information about the molecular evolution of the expansin gene superfamily in soybean.
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