Related Experiment Video
Updated: Oct 1, 2025
06:07
Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
Published on: August 5, 2022
2.7K
Geminiviruses boost active DNA demethylation for counter-defense
Yushuang Guo1, Meng-Ao Jia1, Shaofang Li2
1Key Laboratory of Molecular Genetics, Guizhou Academy of Tobacco Science, Guiyang, Guizhou, 550081, China.
Trends in Microbiology
|March 7, 2022
Summary
Geminiviruses overcome plant defenses by hijacking host DNA demethylation, a process that normally regulates gene expression. This viral strategy promotes infection by manipulating epigenetic mechanisms.
Area of Science:
- Plant molecular biology
- Epigenetics
- Virology
Background:
- DNA methylation is a key epigenetic regulator of gene expression in plants, influencing responses to environmental stresses.
- Pathogens often evolve mechanisms to evade or manipulate host defense systems.
Purpose of the Study:
- To investigate how geminiviruses counteract host defense mechanisms related to DNA methylation.
- To elucidate the role of host DNA glycosylases in geminivirus infection.
Main Methods:
- Analysis of DNA methylation patterns in infected plants.
- Investigating the activity of host DNA glycosylases in the context of geminivirus infection.
- Gene expression analysis to assess the impact of viral manipulation.
Main Results:
- Geminiviruses actively promote DNA demethylation using host DNA glycosylases.
- This viral subversion of DNA methylation enhances viral virulence and promotes successful infection.
- Identified a novel pathogen counter-defense strategy targeting host epigenetic regulation.
Conclusions:
- Geminiviruses employ a sophisticated strategy to disarm plant epigenetic defenses by inducing active DNA demethylation.
- Understanding this mechanism provides insights into plant-pathogen interactions and epigenetic regulation.
- This highlights a unique approach pathogens use to establish infection by manipulating host molecular machinery.
Related Concept Videos
00:36Viral Mutations
34.2K
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...
34.2K
01:29Viruses with RNA Genomes
187
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...
187
01:26Defense Mechanism Against Infection
7.3K
Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
7.3K
02:37DNA Damage can Stall the Cell Cycle
9.4K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.4K
02:37DNA Damage Can Stall the Cell Cycle
2.7K
2.7K
01:26Size and Structure of Viral Genomes
189
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...
189