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Related Concept Videos

Subviral Agents01:29

Subviral Agents

Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Introduction to Virus

Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...
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Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...

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Related Experiment Video

Updated: May 9, 2026

Localization and Quantification of Begomoviruses in Whitefly Tissues by Immunofluorescence and Quantitative PCR
06:25

Localization and Quantification of Begomoviruses in Whitefly Tissues by Immunofluorescence and Quantitative PCR

Published on: February 8, 2020

Advances in understanding begomovirus satellites.

Xueping Zhou1

  • 1State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China. zzhou@zju.edu.cn

Annual Review of Phytopathology
|August 7, 2013
PubMed
Summary

Begomoviruses cause crop diseases, often with essential betasatellites that induce symptoms via their βC1 gene. Plants defend against this, while alphasatellites play a minor role, and molecular tools aid discovery.

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Simple and Robust in vivo and in vitro Approach for Studying Virus Assembly
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Simple and Robust in vivo and in vitro Approach for Studying Virus Assembly

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Simple and Robust in vivo and in vitro Approach for Studying Virus Assembly
09:47

Simple and Robust in vivo and in vitro Approach for Studying Virus Assembly

Published on: March 1, 2012

Area of Science:

  • Plant virology
  • Molecular biology
  • Crop science

Background:

  • Begomoviruses are widespread plant viruses causing significant crop damage.
  • Monopartite begomoviruses often associate with satellite DNA molecules, namely betasatellites and alphasatellites.
  • Betasatellites are crucial for symptom development, while alphasatellites have less understood roles.

Purpose of the Study:

  • To elucidate the roles of betasatellites and alphasatellites in begomovirus infections.
  • To understand the function of the βC1 gene in symptom induction and host defense suppression.
  • To highlight the utility of molecular tools in studying viral diversity and evolution.

Main Methods:

  • Review and synthesis of existing literature on begomoviruses and their satellites.
  • Analysis of the genetic makeup and functional roles of βC1 proteins.
  • Discussion of host plant defense mechanisms against viral proteins.
  • Examination of the application of molecular diagnostic and discovery tools.

Main Results:

  • Betasatellites are essential for typical begomovirus disease symptoms, primarily through the action of their βC1 gene.
  • The βC1 protein suppresses host gene silencing pathways and influences plant hormone responses.
  • Host plants have evolved defense mechanisms against the βC1 protein.
  • Alphasatellites are associated with some begomovirus-betasatellite complexes but do not significantly contribute to pathogenesis.

Conclusions:

  • Betasatellites are key determinants of disease severity in begomovirus infections.
  • Understanding βC1 function and host responses is critical for disease management.
  • Molecular tools are indispensable for ongoing research into geminivirus and satellite DNA diversity and evolution.