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What is Gene Expression?

What is Gene Expression?

Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...

What is Gene Expression?

What is Gene Expression?

A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...

Cell Specific Gene Expression

Cell Specific Gene Expression

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...

Cell Specific Gene Expression

Cell Specific Gene Expression

Chromatin Position Affects Gene Expression

Chromatin Position Affects Gene Expression

Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...

mRNA Stability and Gene Expression

mRNA Stability and Gene Expression

The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability

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Related Experiment Video

Updated: Feb 8, 2026

Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells

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Gene expression changes by high-polyphenols cocoa powder intake: a randomized crossover clinical study.

P K Barrera-Reyes¹, N Hernández-Ramírez¹, J Cortés¹

¹Nutrigenomics and Nutrigenetics, National Institute of Genomic Medicine, 14610, Mexico City, Mexico.

European Journal of Nutrition

|June 28, 2018

Summary

High-polyphenol cocoa intake increased epicatechin metabolites but did not alter plasma antioxidant capacity. Gene expression in peripheral mononuclear cells (PBMCs) suggests anti-inflammatory effects, not a direct antioxidant response.

Keywords:

(−)-Epicatechin Antioxidant Catechin Flavanol Microarray Molecular PBMCs ROS

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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

Published on: June 21, 2018

Area of Science:

Nutritional Science
Molecular Biology
Immunology

Background:

Dietary polyphenols, particularly from cocoa, are investigated for their potential health benefits.
(-)-Epicatechin, a major cocoa polyphenol, has shown antioxidant and anti-inflammatory properties in vitro.
Understanding the molecular mechanisms of cocoa's effects in humans is crucial for validating its health claims.

Purpose of the Study:

To investigate the impact of high-polyphenol cocoa consumption on gene expression in peripheral mononuclear cells (PBMCs) of healthy individuals.
To analyze the relationship between circulating (-)-epicatechin metabolites and plasma antioxidant capacity post-cocoa intake.
To explore potential molecular pathways, including antioxidant and anti-inflammatory responses, modulated by cocoa consumption.

Main Methods:

A randomized, double-blind, placebo-controlled, cross-over clinical trial was conducted in healthy young adults.
Participants consumed a single dose of high-polyphenol cocoa or a control (maltodextrins) with a one-week washout period.
Gene expression in PBMCs was analyzed using microarrays, alongside plasma metabolite and antioxidant capacity measurements.

Main Results:

Cocoa intake led to a significant increase in circulating (-)-epicatechin metabolites, but plasma antioxidant capacity remained unchanged.
Microarray analysis revealed differential gene expression in PBMCs, with 98 genes affected by cocoa versus 18 by the control.
Pathway analysis indicated that cocoa consumption decreased reactive oxygen species production, reduced leukocyte activation, and modulated calcium mobilization.

Conclusions:

No direct association was observed between plasma (-)-epicatechin metabolite levels and plasma antioxidant capacity.
Gene expression changes in PBMCs following cocoa intake suggest potential anti-inflammatory effects.
High-polyphenol cocoa may exert beneficial effects through mechanisms beyond direct plasma antioxidant activity.