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Tunicates have a complex, highly dynamic TNF superfamily.

Ignacio Marín1

  • 1Instituto de Biomedicina de Valencia, Consejo Superior de Investigaciones Científicas (IBV-CSIC), Valencia, Spain.

Plos One
|January 27, 2026
PubMed
Summary
This summary is machine-generated.

Tunicates possess a complex Tumor Necrosis Factor Superfamily (TNFSF) with numerous genes, exceeding some vertebrates. This complexity, driven by gene duplication, highlights rapid evolution and potential roles in immunity.

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Immunology

Background:

  • The evolution of the Tumor Necrosis Factor Superfamily (TNFSF) is not well understood.
  • TNFSF genes are crucial for animal cell signaling, immunity, and development.

Purpose of the Study:

  • To investigate the complexity and evolution of the TNFSF in tunicates.
  • To compare tunicate TNFSF evolution with that of vertebrates.

Main Methods:

  • Analysis of TNFSF gene content across 24 tunicate species.
  • Comparative genomics of tunicate and vertebrate TNFSF genes.
  • Examination of gene expression data from Ciona intestinalis.

Main Results:

  • Tunicates exhibit a more complex TNFSF than previously thought, with up to 14 TNFSF genes in some species due to tandem duplications.
  • Tunicate TNFSF gene sets are highly variable, even among closely related species, indicating rapid evolutionary change.
  • Four TNFSF genes were likely present in the ancestor of tunicates and vertebrates, with subsequent gene loss and duplications in tunicates.

Conclusions:

  • Tunicate TNFSF evolution differs from vertebrates, with gene duplications playing a key role in tunicates but not whole-genome duplications.
  • TNFSF genes in tunicates show diverse expression patterns, suggesting roles in development and innate immunity.
  • The rapid evolution and immune functions of TNFSF genes are conserved across tunicates and vertebrates.