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Phylogenomics of non-model ciliates based on transcriptomic analyses.

Xiao Chen1,2, Xiaolu Zhao2, Xiaohui Liu1

  • 1College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049 China.

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Summary
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This study presents the first deep sequencing of Strombidium sulcatum, a marine ciliate. Analysis revealed gene expression links to morphology and refined ciliate evolutionary relationships.

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Area of Science:

  • Marine biology
  • Eukaryotic microbiology
  • Phylogenomics

Background:

  • Ciliates are ancient, widespread eukaryotic unicellular organisms.
  • Strombidium sulcatum is a key marine oligotrich ciliate influencing food webs.
  • Understanding its genetic makeup is crucial for marine ecosystem studies.

Purpose of the Study:

  • To perform the first deep sequencing and RNA-Seq analysis of Strombidium sulcatum.
  • To reconstruct phylogenomic relationships among ciliates using Strombidium sulcatum data.
  • To investigate the correlation between gene expression and morphological characteristics.

Main Methods:

  • De novo assembly of RNA-Seq data to generate unigenes.
  • Ortholog detection using SPOCS and phylogenomic reconstruction with single-copy orthologs.
  • Phylogenetic network analysis and correlation analysis of gene expression and morphology.

Main Results:

  • Generated 42,640 unigenes from Strombidium sulcatum, with an N50 of 1,451 bp.
  • Phylogenomic analyses provided insights into ciliate class-level relationships, questioning current placements of certain genera.
  • Identified a potential link between the gene expression of epiplasmic proteins and morphological traits.

Conclusions:

  • High-throughput sequencing is valuable for marine ciliate phylogenomics.
  • Gene expression analysis can correlate with morphological characteristics in ciliates.
  • This research enhances understanding of ciliate evolution and marine microbial ecology.