Subtopic Deep Dive

Protist Phylogenomics
Research Guide

What is Protist Phylogenomics?

Protist phylogenomics reconstructs evolutionary relationships among protists using genome-scale data and multi-locus markers to resolve supergroup structures and deep eukaryotic divergences.

This field integrates whole-genome sequences, transcriptomes, and SSU rRNA markers for phylogenetic inference. Key resources include the PR2 database (Guillou et al., 2012, 2246 citations) and MMETSP project (Keeling et al., 2014, 1081 citations). Over 10 highly cited papers from 2004-2018 document classifications and model genomes like Dictyostelium discoideum (Eichinger et al., 2005, 1341 citations).

Curated Papers

Key Challenges

Why It Matters

Protist phylogenomics redefines the eukaryotic tree of life, enabling accurate classification of microbial diversity central to ecology and evolution (Adl et al., 2012, 1630 citations; Adl et al., 2018, 1312 citations). It supports metabarcoding for environmental monitoring using PR2-curated SSU rRNA sequences (Guillou et al., 2012). Genome data from models like Tetrahymena thermophila (Eisen et al., 2006, 774 citations) and Dictyostelium discoideum inform cellular evolution and disease research. MMETSP transcriptomes reveal marine protist functions (Keeling et al., 2014).

Key Research Challenges

Incomplete Genome Coverage

Many protist lineages lack sequenced genomes, limiting phylogenomic resolution. MMETSP addressed marine eukaryotes but non-model groups remain underrepresented (Keening et al., 2014). This biases supergroup relationships (Adl et al., 2018).

Long-Branch Attraction Artifacts

Rapid evolutionary rates in protists cause phylogenetic artifacts in multi-locus trees. Model genomes like Dictyostelium highlight rate heterogeneity issues (Eichinger et al., 2005). Advanced site-heterogeneous models are needed for deep divergences (Hedges et al., 2004).

Taxonomic Reference Gaps

Curated markers like SSU rRNA in PR2 aid metabarcoding but genome-scale integration lags (Guillou et al., 2012). Revisions show ongoing supergroup reassignments (Adl et al., 2012). Environmental sequences challenge cultivated taxonomy.

Essential Papers

The Protist Ribosomal Reference database (PR2): a catalog of unicellular eukaryote Small Sub-Unit rRNA sequences with curated taxonomy

Laure Guillou, Dipankar Bachar, Stéphane Audic et al. · 2012 · Nucleic Acids Research · 2.2K citations

The interrogation of genetic markers in environmental meta-barcoding studies is currently seriously hindered by the lack of taxonomically curated reference data sets for the targeted genes. The Pro...

The Revised Classification of Eukaryotes

Sina M. Adl, Alastair G. B. Simpson, Christopher E. Lane et al. · 2012 · Journal of Eukaryotic Microbiology · 1.6K citations

Abstract This revision of the classification of eukaryotes, which updates that of Adl et al. [ J. Eukaryot. Microbiol . 52 (2005) 399], retains an emphasis on the protists and incorporates changes ...

The genome of the social amoeba Dictyostelium discoideum

Ludwig Eichinger, Justin A. Pachebat, Gernot Glöckner et al. · 2005 · Nature · 1.3K citations

Revisions to the Classification, Nomenclature, and Diversity of Eukaryotes

Sina M. Adl, David Bass, Christopher E. Lane et al. · 2018 · Journal of Eukaryotic Microbiology · 1.3K citations

Abstract This revision of the classification of eukaryotes follows that of Adl et al., 2012 [ J. Euk. Microbiol . 59(5)] and retains an emphasis on protists. Changes since have improved the resolut...

Where less may be more: how the rare biosphere pulls ecosystems strings

Alexandre Jousset, Christina Bienhold, Antonis Chatzinotas et al. · 2017 · The ISME Journal · 1.3K citations

Abstract Rare species are increasingly recognized as crucial, yet vulnerable components of Earth’s ecosystems. This is also true for microbial communities, which are typically composed of a high nu...

The Marine Microbial Eukaryote Transcriptome Sequencing Project (MMETSP): Illuminating the Functional Diversity of Eukaryotic Life in the Oceans through Transcriptome Sequencing

Patrick J. Keeling, Fabien Burki, Heather M. Wilcox et al. · 2014 · PLoS Biology · 1.1K citations

Microbial ecology is plagued by problems of an abstract nature. Cell sizes are so small and population sizes so large that both are virtually incomprehensible. Niches are so far from our everyday e...

Macronuclear Genome Sequence of the Ciliate Tetrahymena thermophila, a Model Eukaryote

Jonathan A. Eisen, Robert S. Coyne, Martin Wu et al. · 2006 · PLoS Biology · 774 citations

The ciliate Tetrahymena thermophila is a model organism for molecular and cellular biology. Like other ciliates, this species has separate germline and soma functions that are embodied by distinct ...

Reading Guide

Foundational Papers

Start with Guillou et al. (2012, PR2) for SSU rRNA reference, Adl et al. (2012) for classification baseline, and Eichinger et al. (2005) for first amoeba genome to grasp data foundations.

Recent Advances

Study Adl et al. (2018) for updated eukaryote classification, Keeling et al. (2014, MMETSP) for marine transcriptomes, and Pawłowski et al. (2018) for eDNA integration advances.

Core Methods

Core techniques: SSU rRNA curation (PR2), multi-locus phylogenomics from genomes (Dictyostelium, Tetrahymena), transcriptome phylogenies (MMETSP), and barcoding (CBOL; Pawłowski et al., 2012).

How PapersFlow Helps You Research Protist Phylogenomics

Discover & Search

Research Agent uses searchPapers and exaSearch to find PR2 database papers (Guillou et al., 2012), then citationGraph maps connections to Adl et al. (2012, 2018) classifications, and findSimilarPapers uncovers related transcriptome projects like MMETSP (Keeling et al., 2014).

Analyze & Verify

Analysis Agent applies readPaperContent to extract phylogenomic datasets from Eichinger et al. (2005), verifies tree topologies with verifyResponse (CoVe), and runs runPythonAnalysis for alignment statistics or bootstrap resampling. GRADE grading scores evidence strength for supergroup claims.

Synthesize & Write

Synthesis Agent detects gaps in protist genome coverage across Adl revisions, flags contradictions in eukaryotic timelines (Hedges et al., 2004), and uses exportMermaid for supergroup diagrams. Writing Agent employs latexEditText, latexSyncCitations for 10+ papers, and latexCompile for publication-ready reviews.

Use Cases

"Analyze SSU rRNA alignment stats from PR2 database papers"

Research Agent → searchPapers('PR2 Guillou') → Analysis Agent → readPaperContent → runPythonAnalysis (pandas for sequence stats, matplotlib phylogenogram) → statistical verification output with bootstraps.

"Compile LaTeX review of protist supergroup revisions"

Research Agent → citationGraph('Adl 2012') → Synthesis → gap detection → Writing Agent → latexEditText + latexSyncCitations (Guillou, Adl papers) → latexCompile → PDF with eukaryotic tree figure.

"Find code for Tetrahymena genome assembly pipelines"

Research Agent → paperExtractUrls('Eisen Tetrahymena') → Code Discovery → paperFindGithubRepo → githubRepoInspect → exportCsv of pipelines for phylogenomic reanalysis.

Automated Workflows

Deep Research workflow conducts systematic review of 50+ protist papers via searchPapers → citationGraph → structured report on supergroup resolutions (Adl et al.). DeepScan applies 7-step analysis with CoVe checkpoints to verify MMETSP transcriptome phylogenies. Theorizer generates hypotheses on rare biosphere protists from Jousset et al. (2017).

Try Doxa for Protist Phylogenomics Research

Frequently Asked Questions

What defines protist phylogenomics?

Protist phylogenomics uses genome-scale data and multi-locus markers to reconstruct evolutionary trees, resolving supergroups and eukaryotic divergences (Adl et al., 2012).

What are key methods in protist phylogenomics?

Methods include SSU rRNA metabarcoding (PR2; Guillou et al., 2012), transcriptome sequencing (MMETSP; Keeling et al., 2014), and multi-gene phylogenies from model genomes (Eichinger et al., 2005).

What are the most cited papers?

Top papers are Guillou et al. (2012, PR2, 2246 citations), Adl et al. (2012, classification, 1630 citations), and Eichinger et al. (2005, Dictyostelium genome, 1341 citations).

What open problems exist?

Challenges include genome gaps for non-model protists, long-branch artifacts, and integrating eDNA metabarcoding with phylogenomics (Adl et al., 2018; Pawłowski et al., 2018).