Related Experiment Video
Updated: Jun 11, 2025
05:55
Identifying Inhibitors of the HBx-DDB1 Interaction Using a Split Luciferase Assay System
Published on: December 21, 2019
6.7K
Foxa deficiency restricts hepatitis B virus biosynthesis through epigenic silencing.
Rachel Matrenec1, Claudia E Oropeza1, Eddie Dekoven1
1Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA.
Journal of Virology
|October 8, 2024
Summary
Targeting forkhead box A (Foxa) activity in the liver may resolve chronic Hepatitis B virus (HBV) infections. Reduced Foxa levels silence viral DNA methylation, halting HBV replication and offering a potential therapeutic strategy.
Area of Science:
- Hepatology
- Virology
- Molecular Biology
Background:
- Chronic Hepatitis B virus (HBV) infection lacks curative therapies, causing significant mortality.
- The small HBV genome limits drug targets, necessitating alternative therapeutic strategies like targeting host factors.
- Forkhead box A (Foxa) transcription factors are crucial for HBV replication in a mouse model.
Purpose of the Study:
- To investigate the role of Foxa transcription factors in HBV biosynthesis and identify potential therapeutic targets.
- To determine if manipulating Foxa activity can lead to the resolution of chronic HBV infection.
Main Methods:
- Utilized a Hepatitis B virus (HBV) transgenic mouse model of chronic infection.
- Generated liver-specific Foxa-deficient mice with varying Foxa gene expression (Foxa1, Foxa2, Foxa3).
- Assessed HBV transcription, replication, viral DNA methylation, and liver pathology.
Main Results:
- Liver-specific Foxa deficiency, particularly with Foxa3 expression, halted HBV replication but caused biliary epithelial hyperplasia.
- Expression of only Foxa1 or Foxa2 also restricted HBV replication with minimal liver pathology.
- The level of Foxa activity, not specific Foxa genes, determined HBV biosynthesis.
- Genetic Foxa deficiency induced CpG methylation and transcriptional silencing of HBV DNA.
Conclusions:
- Foxa activity is a key determinant of HBV biosynthesis.
- Therapeutic targeting of liver Foxa activity could induce HBV DNA methylation and transcriptional inactivation.
- This approach may lead to the resolution of chronic HBV infections.
More Related Videos
09:35Constitutive and Inducible Systems for Genetic In Vivo Modification of Mouse Hepatocytes Using Hydrodynamic Tail Vein Injection
Published on: February 2, 2018
14.1K
09:35Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
Published on: February 1, 2017
13.2K
Related Concept Videos
01:52Eukaryotic Transcription Inhibitors
9.8K
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
9.8K
01:29Viruses with RNA Genomes
5
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...
5
01:46Epigenetic Regulation
30.9K
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
30.9K
01:30General Transcription Factors
5.2K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
5.2K
01:23Cystic Fibrosis: Pathogenesis
194
Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
194
01:58Cell Specific Gene Expression
13.5K
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
13.5K