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Vertebrate TNF Superfamily: Evolution and Functional Insights.
1Instituto de Biomedicina de Valencia, Consejo Superior de Investigaciones Científicas (IBV-CSIC), 46010 Valencia, Spain.
Biology
|January 25, 2025
Summary
The tumor necrosis factor superfamily (TNFSF) evolved from four ancestral genes in early vertebrates. Gene duplications and losses shaped TNFSF diversity, influencing innate and adaptive immunity across species.
Area of Science:
- Evolutionary biology
- Immunology
- Genomics
Background:
- The tumor necrosis factor superfamily (TNFSF) plays critical roles in immune regulation and apoptosis.
- Understanding TNFSF evolution is key to deciphering immune system development in vertebrates.
Purpose of the Study:
- To reconstruct the evolutionary history of the TNFSF across vertebrate lineages.
- To investigate the impact of genome duplication events on TNFSF expansion and contraction.
- To correlate evolutionary patterns with functional diversification of TNFSF genes.
Main Methods:
- Comparative genomics using sequence similarity and synteny data.
- Analysis of gene families across 23 vertebrate model species.
- Phylogenetic reconstruction of TNFSF gene evolution.
Main Results:
- Most TNFSF diversity originated from four ancestral genes predating vertebrate genome duplications.
- Early vertebrate ancestors had six TNFSF genes; gnathostome ancestors had 21.
- Significant TNFSF gene contraction occurred in some gnathostome lineages, particularly tetrapods.
- Descendants of ancestral TNFSF genes acquired distinct immune functions, driving species-specific gene conservation or loss.
Conclusions:
- A model for TNFSF evolution explains gene family expansion and contraction.
- Evolutionary history clarifies complex TNFSF ligand-receptor interactions and functional cooperation.
- TNFSF evolution is intrinsically linked to the development and refinement of vertebrate immune systems.
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