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Arboviral Encephalitis

Arboviral Encephalitis

Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...

Gene Flow

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

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).

What is Population Genetics?

What is Population Genetics?

A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.

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 for adaptive...

Viral Recombination

Viral Recombination

Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.

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Related Experiment Video

Updated: May 26, 2026

Embryo Microinjection Techniques for Efficient Site-Specific Mutagenesis in Culex quinquefasciatus

Embryo Microinjection Techniques for Efficient Site-Specific Mutagenesis in Culex quinquefasciatus

Published on: May 24, 2020

West Nile virus population genetics and evolution.

Kendra N Pesko¹, Gregory D Ebel

¹Department of Pathology, University of New Mexico School of Medicine, 1 University of New Mexico, Albuquerque, NM 87131, USA.

Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases

|January 10, 2012

Summary

West Nile virus (WNV) poses a fatal encephalitis risk to humans. This review examines WNV

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Area of Science:

Virology
Epidemiology
Genetics

Background:

West Nile virus (WNV) is a mosquito-borne flavivirus that can cause fatal encephalitis in humans.
Since its 1999 introduction to North America, WNV has spread globally, causing multiple outbreaks in Europe.
Understanding WNV's evolution and spread is crucial for public health.

Purpose of the Study:

To review recent advancements in understanding WNV population genetics.
To highlight genotypic and phenotypic changes in the WNV genome during adaptation.
To discuss the molecular epidemiology and future research directions for WNV.

Main Methods:

Literature review of recent studies on WNV.
Analysis of viral population genetics and host pressures.
Examination of WNV genome evolution and molecular epidemiology.

Main Results:

Host pressures significantly impact WNV population genetics.
Specific genotypic and phenotypic changes facilitate WNV adaptation.
Molecular epidemiology reveals WNV's global spread patterns.

Conclusions:

Continued research into WNV adaptation and epidemiology is essential.
Understanding viral evolution aids in predicting and controlling WNV outbreaks.
Future research should focus on host-virus interactions and genomic surveillance.