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Characterization of Pipefish Immune Cell Populations Through Single-Cell Transcriptomics.

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Syngnathid fish, lacking a spleen and major histocompatibility class II pathway, possess distinct immune cell populations. Single-cell transcriptomics reveals regulatory and cytotoxic T-cell subtypes, challenging previous assumptions about their immune system evolution.

Keywords:
cell profilingimmune cellimmunitypipefishsingle-cell transcriptomics

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Area of Science:

  • Evolutionary immunology
  • Comparative genomics
  • Teleost fish biology

Background:

  • Syngnathids (seahorses, pipefishes) exhibit unique traits like male pregnancy and have lost key immune components such as the spleen and major histocompatibility class II (MHC II) pathway.
  • The impact of these evolutionary modifications on immune cell populations in syngnathids remains largely unexplored.

Purpose of the Study:

  • To characterize the immune cell repertoire of the pipefish *Syngnathus typhle* using single-cell transcriptomics.
  • To investigate how the loss of the spleen and MHC II pathway has influenced immune cell populations in syngnathids.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) was performed on blood and head-kidney cells from *Syngnathus typhle*.
  • Gene expression profiles were analyzed to identify and cluster distinct cell populations.
  • Upregulated cell marker genes, conserved across humans and teleosts, were used for cell type identification.

Main Results:

  • Twelve putative cell populations were identified, with eight exhibiting immune functions.
  • The study supported the hypothesized loss of CD4+ T-cells, consistent with the MHC II pathway loss.
  • Specific subtype markers indicated the presence of regulatory T-cells (expressing *il2rb*) and cytotoxic T-cells (expressing *gzma*) within the T-cell cluster.

Conclusions:

  • This is the first characterization of immune cell populations in syngnathids using single-cell transcriptomics.
  • The findings provide a foundation for future research on immune cell classification and function in this unique fish lineage.
  • The presence of T-cell subtypes suggests a more complex immune system than previously inferred from the loss of certain immune pathways.