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Gene-Environment Interactions

Gene-Environment Interactions

Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

Background and Environment Affect Phenotype

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants

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Epigenetics and environmental chemicals.

Andrea Baccarelli¹, Valentina Bollati

¹Laboratory of Environmental Epigenetics, Center of Molecular and Genetic Epidemiology, Department of Environmental and Occupational Health, University of Milan, Via San Barnaba 8, Milan, Italy. andrea.baccarelli@unimi.it

Current Opinion in Pediatrics

|August 11, 2009

Summary

This summary is machine-generated.

Environmental chemicals can alter epigenetic marks, influencing gene expression without changing DNA. These epigenetic changes are linked to disease, but further research is needed to understand their long-term effects and transgenerational transmission.

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Area of Science:

Environmental Epigenetics
Toxicology
Molecular Biology

Background:

Epigenetics involves heritable gene expression changes without altering DNA sequence.
Mechanisms like DNA methylation, histone modifications, and microRNA regulate genome function.
Exogenous influences can lead to epigenetic alterations.

Purpose of the Study:

To review evidence that epigenetic alterations mediate toxicity from environmental chemicals.
To summarize current understanding of how environmental factors impact epigenetic marks.

Main Methods:

Review of in-vitro, animal, and human investigations.
Analysis of studies on environmental chemicals and epigenetic modifications.
Focus on DNA methylation, histone modifications, and microRNA.

Main Results:

Identified chemical classes that modify epigenetic marks: metals, peroxisome proliferators, air pollutants, and endocrine disruptors.
Most research has focused on DNA methylation, with fewer studies on histone modifications and microRNA.
Evidence shows chemicals alter epigenetic marks, and these alterations are found in disease states.

Conclusions:

Chemicals are confirmed to alter epigenetic marks, linking them to disease.
Prospective studies are required to determine if epigenetic changes increase disease risk over time.
Further research is needed to explore the transgenerational inheritance of environmental epigenetic changes.