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What are Viruses?

What are Viruses?

The Eukaryotic Promoter Region

The Eukaryotic Promoter Region

The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...

The Eukaryotic Promoter Region

The Eukaryotic Promoter Region

Drug Delivery: Enteral Route

Drug Delivery: Enteral Route

The enteral drug administration involves three primary routes: oral, sublingual, and buccal. Oral ingestion is the most prevalent, safe, economical, and convenient method for drug administration. However, it has certain drawbacks, including limited absorption due to the drug's low water solubility or poor membrane permeability, possible emesis from GI mucosa irritation, destruction of drugs by digestive enzymes or low gastric pH, and irregular absorption along with food or other drugs.

Routes of Drug Administration: Enteral

Routes of Drug Administration: Enteral

Medications can be administered through the enteral route using liquids, capsules, or tablets.
Enteral administration involves drug administration via the mouth in two ways: orally or sublingually.
Unlike sublingually drugs, drugs that are taken orally pass through the gastrointestinal (GI) tract and get metabolized by the liver. Once metabolized, the drug is absorbed into the systemic circulation, reaching different body parts via the bloodstream. However, while passing through the stomach,...

Physiology of Enteric Nervous System and Gut Health

Physiology of Enteric Nervous System and Gut Health

The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of the...

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Related Experiment Video

Updated: Jan 22, 2026

Influenza A Virus Studies in a Mouse Model of Infection

Influenza A Virus Studies in a Mouse Model of Infection

Published on: September 7, 2017

Enteric viruses exploit the microbiota to promote infection.

Christopher M Robinson¹

¹Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN, USA.

Current Opinion in Virology

|July 9, 2019

Summary

Certain enteric viruses use gut bacteria to enhance their infection, replication, and spread. This interaction challenges the traditional view of viruses infecting cells in isolation, highlighting the importance of the gut microbiome in viral pathogenesis.

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Last Updated: Jan 22, 2026

Influenza A Virus Studies in a Mouse Model of Infection

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Published on: September 7, 2017

Establishment of Viral Infection and Analysis of Host-Virus Interaction in Drosophila Melanogaster

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Published on: March 14, 2019

Vaccinia Virus Infection & Temporal Analysis of Virus Gene Expression: Part 1

Vaccinia Virus Infection & Temporal Analysis of Virus Gene Expression: Part 1

Published on: April 8, 2009

Area of Science:

Microbiology
Virology
Gastroenterology

Background:

The mammalian gastrointestinal tract harbors a complex bacterial community.
Enteric viruses are known pathogens that infect this tract.
Emerging evidence indicates interactions between enteric viruses and intestinal bacteria.

Purpose of the Study:

To review current knowledge on enteric virus-bacterial interactions.
To discuss the implications of these interactions for viral pathogenesis and transmission.

Main Methods:

Literature review of studies investigating enteric virus-bacterial interactions.
Analysis of viral mechanisms involving bacterial binding and utilization.
Discussion of experimental and observational data.

Main Results:

Multiple enteric viruses from diverse families bind to bacteria or bacterial components.
Bacterial association aids viral replication, pathogenesis, and transmission.
These interactions suggest a reevaluation of the traditional single-virus, single-cell infection model.

Conclusions:

Enteric virus-bacterial interactions are a significant factor in viral disease.
The gut microbiome plays a crucial role in enteric viral infections.
Understanding these interactions is vital for developing new therapeutic and preventative strategies.