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Protist diversity and phylogeny
Research Guide
What is Protist diversity and phylogeny?
Protist diversity and phylogeny is the study of the global variety and evolutionary relationships among microbial eukaryotes, encompassing protist taxonomy, plastid evolution, genomic diversity, phylogenetic analysis of marine eukaryotes, endosymbiotic associations, and environmental DNA sequencing of eukaryotic microbial communities.
This field includes 157,992 works focused on the evolutionary origins and complexity of eukaryotic microbial communities across environments. Key methods involve rRNA gene sequencing for phylogenetics, as in 'AMPLIFICATION AND DIRECT SEQUENCING OF FUNGAL RIBOSOMAL RNA GENES FOR PHYLOGENETICS' (1990), and software tools like 'MEGA7: Molecular Evolutionary Genetics Analysis Version 7.0 for Bigger Datasets' (Kumar et al., 2016) for analyzing larger phylogenomic datasets. Genome assembly tools such as 'SPAdes: A New Genome Assembly Algorithm and Its Applications to Single-Cell Sequencing' (Bankevich et al., 2012) enable sequencing of uncultivated protists.
Topic Hierarchy
Research Sub-Topics
Protist Phylogenomics
This sub-topic reconstructs protist evolutionary trees using genome-scale data and multi-locus markers. Researchers resolve supergroup relationships and deep eukaryotic divergences.
Plastid Evolution and Endosymbiosis
This sub-topic traces primary, secondary, and tertiary plastid acquisitions across protist lineages. Researchers analyze organelle genomes and host-symbiont integration.
Marine Protist Diversity via eDNA
This sub-topic profiles eukaryotic plankton communities using metabarcoding of environmental DNA. Researchers quantify rare taxa and seasonal dynamics in ocean microbiomes.
Protist Taxonomy and Nomenclature
This sub-topic refines classification using integrative approaches combining morphology, ultrastructure, and molecules. Researchers propose emendations for polyphyletic groups.
Genomic Diversity of Free-Living Protists
This sub-topic sequences and compares genomes of amoebozoa, ciliates, and heteroloboseans from natural environments. Researchers identify adaptive genes and metabolic versatility.
Why It Matters
Protist diversity and phylogeny underpin understanding of eukaryotic evolution, with applications in environmental monitoring and health, such as tracking harmful algal blooms and malaria vectors noted in Journal of Eukaryotic Microbiology coverage. The Earth BioGenome Project Phase II has generated 1,667 high-quality genome sequences from diverse protists as of September 14, 2024, aiding resolution of the eukaryotic tree of life. Tools like PhyloFisher facilitate phylogenomic analysis of eukaryotic protein sequences, supporting studies of uncultivated microbes via environmental DNA sequencing, as demonstrated in the Sargasso Sea shotgun sequencing yielding 1.045 billion base pairs (Venter et al., 2004).
Reading Guide
Where to Start
'MEGA7: Molecular Evolutionary Genetics Analysis Version 7.0 for Bigger Datasets' (Kumar et al., 2016) first, as it introduces optimized phylogenomic tools essential for protist analysis on larger datasets.
Key Papers Explained
'MEGA7: Molecular Evolutionary Genetics Analysis Version 7.0 for Bigger Datasets' (Kumar et al., 2016) builds on rRNA sequencing from 'AMPLIFICATION AND DIRECT SEQUENCING OF FUNGAL RIBOSOMAL RNA GENES FOR PHYLOGENETICS' (White et al., 1990) by enabling analysis of bigger datasets; 'SPAdes: A New Genome Assembly Algorithm and Its Applications to Single-Cell Sequencing' (Bankevich et al., 2012) extends this to uncultured protist genomes, evaluated by 'QUAST: quality assessment tool for genome assemblies' (Gurevich et al., 2013); 'Phylogenetic identification and in situ detection of individual microbial cells without cultivation' (Amann et al., 1995) provides foundational non-cultivation detection methods.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Preprints like 'Protists with Uncertain Phylogenetic Affiliations for Resolving the Deep Tree of Eukaryotes' target unresolved lineages; Earth BioGenome Project Phase II has produced 1,667 protist genomes; 'A robustly rooted tree of eukaryotes reveals their excavate ancestry' infers heimdallarchaeial origins.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | MEGA7: Molecular Evolutionary Genetics Analysis Version 7.0 fo... | 2016 | Molecular Biology and ... | 44.4K | ✓ |
| 2 | AMPLIFICATION AND DIRECT SEQUENCING OF FUNGAL RIBOSOMAL RNA GE... | 1990 | Elsevier eBooks | 34.5K | ✓ |
| 3 | SPAdes: A New Genome Assembly Algorithm and Its Applications t... | 2012 | Journal of Computation... | 25.7K | ✓ |
| 4 | QUAST: quality assessment tool for genome assemblies | 2013 | Bioinformatics | 10.4K | ✓ |
| 5 | Phylogenetic identification and in situ detection of individua... | 1995 | Microbiological Reviews | 8.3K | ✓ |
| 6 | Soil Sampling and Methods of Analysis | 2007 | — | 6.4K | ✕ |
| 7 | Towards a natural system of organisms: proposal for the domain... | 1990 | Proceedings of the Nat... | 6.0K | ✓ |
| 8 | MICROBIAL BIOFILMS | 1995 | Annual Review of Micro... | 4.4K | ✕ |
| 9 | Environmental Genome Shotgun Sequencing of the Sargasso Sea | 2004 | Science | 4.3K | ✕ |
| 10 | GetOrganelle: a fast and versatile toolkit for accurate de nov... | 2020 | Genome biology | 3.6K | ✓ |
In the News
The Earth BioGenome Project Phase II: illuminating the eukaryotic tree of life
produced at scale, regardless of whether the target is a protist, a fungus, an animal, or a plant (see the Darwin Tree of Life Genome Notes collection for examples of successful chromosomal assembl...
The Biodiversity Cell Atlas: mapping the tree of life at cellular resolution
Cell types are fundamental functional units that can be traced across the tree of life. Rapid advances in single-cell technologies, coupled with the phylogenetic expansion in genome sequencing, pre...
A robustly rooted tree of eukaryotes reveals their excavate ancestry
### Inference and reconstruction of the heimdallarchaeial ancestry of eukaryotes ArticleOpen access14 June 2023 ### Expanded diversity of Asgard archaea and their relationships with eukaryotes
Tree of Life
The Tree of Life Programme investigates the diversity and origins of life on Earth using DNA sequencing. Our research covers all eukaryotic organisms, which means all complex life with a nucleus in...
The Earth BioGenome Project: scaling up
However, the EBP has yet to secure full funding, although decentralized nodes have attracted funding from more than 20 countries.
Code & Tools
#### Taxonomy structure
interact with the software produced by the [Open Tree of Life project] 1 . Specifically, to: 1. interact with a local version of the [phylesystem] ...
PhyloFisher is a software package written in Python3 that can be used for the creation, analysis, and visualization of phylogenomic datasets that c...
This repository contains the following: 1. `Smasher`, a taxonomy manipulation tool * Java package`taxa`, general classes for taxa and taxonomies * ...
- Ceja-Navarro JA, Wang Y, Ning D, Arellano A, Ramanculova L, Yuan MM, Byer A, Craven KD, Saha MC, Brodie EL, Pett-Ridge J, and Firestone MK. 2021....
Recent Preprints
Protists with Uncertain Phylogenetic Affiliations for Resolving the Deep Tree of Eukaryotes
Resolving the eukaryotic tree of life (eToL) remains a fundamental challenge in biology. Much of eukaryotic phylogenetic diversity is occupied by unicellular microbial eukaryotes (i.e., protists). ...
Journal of Eukaryotic Microbiology
harmful algal blooms to malaria to research on protist evolution and diversity. Published on behalf of the International Society of Protistologists.
Dated gene duplications elucidate the evolutionary ...
Our phylogenetic analyses were based on a concatenation of 62 marker genes including taxa chosen to provide a phylogenetically representative sample of eukaryotes, bacteria and archaea, particularl...
The Earth BioGenome Project Phase II: illuminating the eukaryotic tree of life
The original plan for EBP Phase I was to deliver approximately 10,000 genome sequences, one for each eukaryotic family, over a 3-year period (an average of 300 genomes/month). As of September 14, 2...
(PDF) The evolution of Protozoa
of electron microscopy to nearly all of the major protist cell types and the use of these data to develop explicit phylogenies (16, 17, 18, 19, 21, 23, 25, 27, 29, 32, 34-38, 132, 133); together wi...
Latest Developments
Recent research indicates that protist diversity and phylogeny are being extensively studied through genomic and phylogenomic approaches, revealing their critical roles in eukaryotic evolution, with efforts focusing on sequencing poorly studied flagellates and reconstructing deep evolutionary relationships within the eukaryotic tree of life as of early 2025 (ScienceDirect, Nature, PubMed).
Sources
Frequently Asked Questions
What methods are used for phylogenetic analysis of protists?
MEGA7 provides sophisticated methods for phylogenomics on larger datasets using 64-bit systems (Kumar et al., 2016). Amplification and direct sequencing of fungal ribosomal RNA genes enable protist phylogenetics (White et al., 1990). SPAdes assembles single-cell genomes from uncultivated protists (Bankevich et al., 2012).
How is protist diversity assessed without cultivation?
Phylogenetic identification combines rRNA sequence retrieval and in situ hybridization to detect individual microbial cells (Amann et al., 1995). Environmental genome shotgun sequencing, as in the Sargasso Sea study, generates nonredundant sequences from microbial populations (Venter et al., 2004). GetOrganelle assembles organelle genomes de novo from protist data (Jin et al., 2020).
What is the role of endosymbiotic associations in protist evolution?
Endosymbiotic associations contribute to plastid evolution and eukaryotic origins, central to protist taxonomy. Environmental DNA sequencing uncovers complexity in marine eukaryote communities. The field proposes domains Archaea, Bacteria, and Eucarya based on molecular sequences (Woese et al., 1990).
Which tools evaluate protist genome assemblies?
QUAST assesses genome assembly quality by comparing to reference sequences (Gurevich et al., 2013). SPAdes targets single-cell sequencing of uncultivable bacteria and protists (Bankevich et al., 2012). GetOrganelle provides fast de novo assembly of organelle genomes relevant to protists (Jin et al., 2020).
What is the current state of protist phylogenetic resolution?
Recent preprints address protists with uncertain affiliations to resolve the deep eukaryotic tree. The Earth BioGenome Project Phase II advances protist genome sequencing. A robustly rooted tree reveals excavate ancestry of eukaryotes.
Open Research Questions
- ? How can protists with uncertain phylogenetic affiliations resolve the deep eukaryotic tree of life?
- ? What dated gene duplications clarify evolutionary timelines in protist phylogeny?
- ? How does the Earth BioGenome Project Phase II illuminate uncultured protist diversity?
- ? What role do Asgard archaea play in rooting the eukaryotic tree near excavates?
Recent Trends
The Earth BioGenome Project Phase II generated 1,667 high-quality protist genomes by September 2024, advancing from Phase I's 10,000 target.
Preprints such as 'Protists with Uncertain Phylogenetic Affiliations for Resolving the Deep Tree of Eukaryotes' address unresolved lineages; 'Dated gene duplications elucidate the evolutionary ...' uses 62 marker genes for phylogeny.
2025News highlights 'A robustly rooted tree of eukaryotes reveals their excavate ancestry' and Biodiversity Cell Atlas for cellular resolution across the tree of life.
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