Related Experiment Video
Updated: Oct 6, 2025
08:57
Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
Published on: August 14, 2018
16.1K
Providing a phylogenetic framework for trait-based analyses in brown algae: Phylogenomic tree inferred from 32
Shingo Akita1, Christophe Vieira2, Takeaki Hanyuda2
1Kobe University Research Center for Inland Seas, Rokkodai 1-1, Kobe 657-8501, Japan; Faculty of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido 041-8611, Japan.
Molecular Phylogenetics and Evolution
|January 15, 2022
Summary
Resolving brown algae (Phaeophyceae) evolution requires robust phylogenetics. Analyzing nuclear protein-coding sequences provides strong support for brown algae relationships, clarifying evolutionary history.
Area of Science:
- Evolutionary biology
- Phycology
- Genomics
Background:
- Establishing a reliable phylogenetic framework is crucial for understanding the evolution of biological complexity.
- Previous molecular studies on brown algae (Phaeophyceae) have yielded inconclusive results regarding interordinal relationships.
Purpose of the Study:
- To resolve unclear phylogenetic relationships among higher groups of brown algae.
- To evaluate the effectiveness of nuclear protein-coding sequences for phylogenomic analysis in Phaeophyceae.
Main Methods:
- Phylogenomic analysis of 32 nuclear protein-coding sequences.
- Inclusion of 39 Phaeophycean species across eight orders.
- Comparison with previous multi-gene (chloroplast, mitochondrial, nuclear) analyses.
Main Results:
- Nuclear-based phylogenomic trees provided strong support for most interordinal relationships within Phaeophyceae.
- Results largely corroborated previous multi-gene phylogenetic trees.
- The placement of Sphacelariales showed weak bootstrap support, indicating a potential area for further investigation.
Conclusions:
- Nuclear protein-coding sequences are a powerful tool for resolving phylogenetic relationships in brown algae.
- This approach offers significant support for clarifying interordinal relationships within Phaeophyceae.
- Increased taxon sampling may further enhance the resolution of phylogenetic uncertainties.
More Related Videos
Related Concept Videos
02:54Evolutionary Relationships through Genome Comparisons
6.4K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
6.4K
03:21Phylogenetic Trees
48.0K
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
48.0K
02:05Gene Evolution - Fast or Slow?
7.5K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
7.5K
01:29Modern Molecular Taxonomy
234
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
234
01:23Phylogeny
54.0K
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
54.0K
02:16Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes
14.4K
The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
14.4K