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Gene-Environment Interactions01:20

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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...
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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
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Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
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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 Regulation01:46

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Considerations for Using Genetic and Epigenetic Information in Occupational Health Risk Assessment and Standard

P A Schulte1, C Whittaker1, C P Curran2

  • 1a Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health (NIOSH), Education and Information Division , Cincinnati , Ohio.

Journal of Occupational and Environmental Hygiene
|November 20, 2015
PubMed
Summary
This summary is machine-generated.

Genetic and epigenetic data can enhance occupational risk assessment and standard setting by informing hazard identification, dose-response modeling, and exposure assessment. A novel framework organizes these applications for improved toxicity pathway-based evaluations.

Keywords:
gene-environment interactiongenotypepolymorphismsxenobiotic, molecular epidemiology

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Area of Science:

  • Occupational Health
  • Toxicology
  • Genetics & Epigenetics

Background:

  • Risk assessment is crucial for occupational health and setting exposure limits.
  • Genetic and epigenetic factors influence biological responses to hazards and can be targets of them.
  • Current risk assessment paradigms have not fully integrated genetic and epigenetic data.

Purpose of the Study:

  • To explore the use of genetic and epigenetic information in occupational risk assessment.
  • To provide guidance for integrating this data into existing risk assessment frameworks.
  • To propose a structured approach for utilizing genetic and epigenetic data in standard setting.

Main Methods:

  • Development of a 4x4 matrix framework.
  • The matrix maps risk assessment functions against genetic and epigenetic data types.
  • Identification of specific applications within each cell of the matrix.

Main Results:

  • Genetic and epigenetic data can serve as endpoints for hazard identification.
  • These data can act as exposure indicators and effect modifiers.
  • Applications include describing modes of action and characterizing toxicity pathways.

Conclusions:

  • Genetic and epigenetic data offer potential to reduce uncertainty in risk assessment extrapolations.
  • High-throughput technologies generate vast datasets for variability assessment.
  • This integration may lead to a new paradigm of toxicity pathway-based risk assessments.