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Related Concept Videos

Types of Toxins01:36

Types of Toxins

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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.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
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Toxicity Testing in Animals01:23

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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
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Toxicokinetics: Overview01:21

Toxicokinetics: Overview

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Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
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Toxic Reactions: Overview01:26

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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
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Gene-Environment Interactions01:20

Gene-Environment Interactions

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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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Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

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Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
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Related Experiment Video

Updated: Mar 11, 2026

Ecotoxicological Methodologies to Evaluate Biomarkers at Different Scales in Neotropical Anurans
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Toxicogenomics in Environmental Science.

Alexandra Brinke1, Sebastian Buchinger2

  • 1Division of Biochemistry and Ecotoxicology, Federal Institute of Hydrology (BfG), Koblenz, 56068, Germany. alexandra.brinke@bafg.de.

Advances in Biochemical Engineering/Biotechnology
|November 20, 2016
PubMed
Summary

Environmental ecotoxicogenomics uses transcriptomic methods to understand toxic effects in aquatic ecosystems. Linking molecular changes to observable effects helps identify environmental stressors and aids in regulations like REACH.

Keywords:
(Eco-)toxicogenomicsPathway analysisTranscriptional patternTranscriptomic biomarkeromics in regulation

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Genomics

Background:

  • Ecotoxicogenomics applies omics technologies to detect environmental adverse effects, distinct from human toxicology.
  • Transcriptomic methods in ecotoxicology aim to mechanistically understand toxic effects, bridging the gap between cause and effect.
  • Phenotypic-anchoring links transcriptomic changes to macroscopic effects for valid interpretation.

Purpose of the Study:

  • Review current knowledge and progress in environmental ecotoxicogenomics.
  • Focus on the application and interpretation of transcriptomic methods in ecotoxicology.
  • Discuss the integration of macroscopic and transcriptomic effects for stressor identification.

Main Methods:

  • Utilizing transcriptomic methods to study gene expression changes in organisms.
  • Applying the principle of phenotypic-anchoring to link molecular and macroscopic effects.
  • Analyzing stressor-specific induced pathways, patterns, and genetic biomarkers.

Main Results:

  • Demonstrated the combined application of macroscopic and transcriptomic effects for identifying aquatic pollutants.
  • Identified stressor-specific transcriptomic signatures.
  • Highlighted challenges in standardizing transcriptomic applications in ecotoxicology.

Conclusions:

  • Integrating transcriptomic data with macroscopic observations provides a robust approach to identify environmental stressors.
  • Standardized transcriptomic methods are crucial for reliable environmental risk assessment and regulation.
  • Transcriptomics holds significant potential for environmental regulation, including frameworks like REACH.