Related Experiment Video
Updated: Feb 13, 2026
09:16
Eukaryotic Polyribosome Profile Analysis
Published on: June 15, 2010
53.3K
A Comparative Analysis of Long-Term Effective Population Sizes Across Eukaryotes
Loveday Lewin1, Adam Eyre-Walker1
1School of Life Sciences, University of Sussex, Brighton, UK.
Molecular Ecology
|February 12, 2026
Summary
This study estimates long-term effective population size (Ne) across 120 eukaryotic species. Small Ne correlates with reduced natural selection efficacy, impacting evolutionary processes.
Area of Science:
- Population Genetics
- Evolutionary Biology
- Genomics
Background:
- Effective population size (Ne) is crucial in population genetics but rarely estimated across diverse species.
- Limited comparative studies exist for Ne across eukaryotes.
Purpose of the Study:
- To estimate long-term Ne for 120 diverse eukaryotic species.
- To investigate factors influencing Ne variation and its evolutionary consequences.
Main Methods:
- Utilized nucleotide diversity and mutation rate estimates for Ne calculation.
- Employed phylogenetically controlled regressions to analyze trait correlations.
- Assessed the efficacy of natural selection using non-synonymous to synonymous diversity ratios (πN/πS).
Main Results:
- Ne varied by nearly 4 orders of magnitude across species.
- Ne exhibited strong phylogenetic structure at broad taxonomic levels.
- Ne correlated with life history traits (generation time, propagule size) and nucleotide diversity.
Conclusions:
- Nucleotide diversity is a reliable proxy for Ne.
- Small Ne is linked to reduced natural selection efficacy but not increased genome size.
- Provides a broad eukaryotic perspective on Ne drivers and evolutionary impacts.
Related Concept Videos
02:31Replication in Eukaryotes
205.8K
Overview
205.8K
03:21Genome Size and the Evolution of New Genes
9.2K
While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
9.2K
01:20Comparing the Survival Analysis of Two or More Groups
617
Survival analysis is a cornerstone of medical research, used to evaluate the time until an event of interest occurs, such as death, disease recurrence, or recovery. Unlike standard statistical methods, survival analysis is particularly adept at handling censored data—instances where the event has not occurred for some participants by the end of the study or remains unobserved. To address these unique challenges, specialized techniques like the Kaplan-Meier estimator, log-rank test, and...
617
02:40The Eukaryotic Promoter Region
19.0K
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
19.0K
02:40The Tree of Life - Bacteria, Archaea, Eukaryotes
39.2K
The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
39.2K
00:58Eukaryotic RNA Polymerases
27.2K
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
27.2K