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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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Gleaning Euglenozoa-specific DNA polymerases in public single-cell transcriptome data.

Ryo Harada1, Yuji Inagaki2

  • 1Graduate School of Life and Environmental Sciences, University of Tsukuba, Japan.

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|December 1, 2023
PubMed
Summary
This summary is machine-generated.

Researchers explored family A DNA polymerases (famA DNAPs) in Euglenozoa using new transcriptome data. This study reveals novel famA DNAP diversity in deep evolutionary branches of this phylum.

Keywords:
DiplonemeaEuglenidaKinetoplasteaLateral gene transferPhagesSymbiontida

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • Family A DNA polymerases (famA DNAPs) are crucial enzymes found in various organisms, including eukaryotes, often functioning in organelles.
  • Euglenozoa exhibit diverse famA DNAP types (PolIA, PolIBCD+, POP, eugPolA), but their evolutionary history, especially in basal lineages, remains poorly understood due to limited sequence data.
  • Previous studies lacked comprehensive sampling across Euglenozoa's diversity, leaving gaps in understanding famA DNAP evolution.

Purpose of the Study:

  • To investigate the evolutionary history and diversity of family A DNA polymerases (famA DNAPs) within the phylum Euglenozoa.
  • To address the lack of sequence data in deep-branching Euglenozoa by analyzing single-cell transcriptome data.
  • To provide an updated understanding of famA DNAP repertoires across Euglenozoa.

Main Methods:

  • Utilized single-cell transcriptome data from phagotrophic euglenids and symbiontids.
  • Identified and analyzed 16 new family A DNA polymerase (famA DNAP) sequences.
  • Performed comparative analysis to reconstruct the evolutionary patterns of famA DNAPs in Euglenozoa.

Main Results:

  • Discovered 16 novel famA DNAP sequences from newly analyzed transcriptome data.
  • Expanded the known diversity of famA DNAPs in previously underrepresented basal Euglenozoa lineages.
  • Provided new molecular data to fill gaps in the evolutionary record of famA DNAPs in Euglenozoa.

Conclusions:

  • The study significantly enhances our understanding of famA DNAP diversity and evolution in Euglenozoa.
  • New data from phagotrophic and symbiotic euglenids illuminate the evolutionary trajectory of these key enzymes in early diverging lineages.
  • This research contributes to a more complete picture of eukaryotic DNA polymerase evolution.