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Viral Mutations

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...

The Evidence for Evolution

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.

Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).

Single Nucleotide Polymorphisms-SNPs

Single Nucleotide Polymorphisms-SNPs

A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...

Gene Evolution - Fast or Slow?

Gene Evolution - Fast or Slow?

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...

Gene Evolution - Fast or Slow?

Gene Evolution - Fast or Slow?

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Related Experiment Video

Updated: Jan 11, 2026

Live Imaging and Quantification of Viral Infection in K18 hACE2 Transgenic Mice Using Reporter-Expressing Recombinant SARS-CoV-2

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Published on: November 5, 2021

What Has SARS-CoV-2 Taught Us About Evolution?

Yingguang Liu¹

¹Molecular and Cellular Sciences, Liberty University College of Osteopathic Medicine, Lynchburg, USA.

|November 14, 2025

Summary

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) evolved rapidly, showing adaptive radiation and selective sweeps. Its spike protein adapted to human cells, demonstrating evolutionary principles like convergence and punctuated equilibrium.

Keywords:

adaptation adaptive radiation covid-19 diminishing returns epistasis muller’s ratchet origin and evolution of viruses and other micro-organisms pleotropic effects punctuated equilibrium theory sars-cov-2 (severe acute respiratory syndrome coronavirus-2)

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Production of a SARS-CoV-2 Virus-Like-Particle System to Investigate Viral Life Cycles In Vitro

Published on: June 6, 2025

Area of Science:

Evolutionary biology
Virology
Genomics

Background:

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has undergone significant evolution since its global dissemination.
Understanding viral evolution is crucial for public health and pandemic preparedness.

Purpose of the Study:

To demonstrate real-time evolutionary biology concepts using SARS-CoV-2.
To analyze the adaptive mechanisms and evolutionary trajectory of SARS-CoV-2 variants.

Main Methods:

Observational analysis of SARS-CoV-2 genomic data over five and a half years.
Tracking variant emergence, dominance, and extinction patterns.
Investigating molecular specialization and selection pressures on viral proteins.

Main Results:

SARS-CoV-2 exhibited adaptive radiation and selective sweeps, with variants driving others to extinction.
Spike protein adaptation involved shifting affinity from bat to human cells and optimizing for nasal cell replication.
Evolutionary constraints led to convergent mutations, diminishing-returns epistasis, and punctuated equilibrium.
Delta variant was an evolutionary dead end; Omicron showed higher codon usage potentially due to host immune pressure.

Conclusions:

SARS-CoV-2 evolution exemplifies key principles of evolutionary biology, including adaptive radiation, selective sweeps, and punctuated equilibrium.
Viral adaptation involves complex trade-offs, molecular specialization, and convergent evolution.
Understanding these evolutionary dynamics is vital for predicting future viral behavior and developing effective interventions.