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Related Experiment Videos

Polymorphisms in the human AH receptor.

Patricia A Harper1, Judy m Y Wong, Maria S M Lam

  • 1Division of Clinical Pharmacology, Research Institute, The Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8. pharper@sickkids.ca

Chemico-Biological Interactions
|September 6, 2002
PubMed
Summary
This summary is machine-generated.

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Genetic variations in the Aryl hydrocarbon receptor (AHR) influence sensitivity to environmental contaminants like TCDD. Few human AHR gene polymorphisms significantly alter AHR function, impacting toxic responses.

Area of Science:

  • Environmental Toxicology
  • Molecular Biology
  • Genetics

Background:

  • The Aryl hydrocarbon receptor (AHR) is a key mediator of toxicity for environmental contaminants such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).
  • Genetic variations in the AHR significantly affect sensitivity to TCDD's biochemical and toxic effects in animal models.
  • Human AHR gene polymorphisms are relatively rare, primarily located in exon 10, which encodes a crucial transactivation domain.

Purpose of the Study:

  • To investigate the role of human AHR gene polymorphisms in varying responses to AHR-mediated environmental exposures.
  • To identify specific AHR polymorphisms that demonstrably alter receptor function and influence toxicological outcomes.

Main Methods:

  • Analysis of human AHR gene sequences to identify polymorphisms.

Related Experiment Videos

  • Phenotypic assessment of AHR-mediated responses, such as CYP1A1 induction, in relation to identified polymorphisms.

    • Main Results:

    • A wide range of AHR-regulated responses, including CYP1A1 induction, exists in human populations.
    • Only one pair of polymorphisms (codons 517 and 570) has been clearly linked to a strong phenotypic effect on AHR-mediated responses.
    • Most identified human AHR polymorphisms are located in exon 10, affecting the transactivation domain.

    Conclusions:

    • Genetically based variations in AHR structure contribute to differential human responsiveness to environmental contaminants.
    • Further research is needed to discover additional polymorphisms that impact AHR function.
    • Understanding AHR polymorphisms is crucial for assessing risks from environmental contaminants and for comprehending its physiological role in development.