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Related Concept Videos

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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Epistasis Analysis01:09

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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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Background and Environment Affect Phenotype02:27

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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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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
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Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
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Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease

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Gene-environment interaction and Mendelian randomisation.

P Kolber1, R Krüger2

  • 1Luxembourg Centre for Systems Biomedicine, Clinical and Experimental Neuroscience, University of Luxembourg, 4362 Belval, Esch-sur-Alzette, Luxembourg; Neurology, Centre Hospitalier de Luxembourg, Luxembourg, Luxembourg.

Revue Neurologique
|September 24, 2019
PubMed
Summary
This summary is machine-generated.

Environmental factors and genetic susceptibility significantly contribute to Parkinson's disease (PD) risk. Mendelian randomization studies offer a novel approach to investigate causal links between environmental exposures and PD development.

Keywords:
Gene-environment interactionGenome-wide association studies (GWAS)Mendelian randomisationParkinson's disease

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Area of Science:

  • Neuroscience
  • Genetics
  • Environmental Health

Background:

  • Parkinson's disease (PD) etiology is complex, with genetics accounting for only one-third of cases.
  • Environmental exposures like pesticides and heavy metals, alongside genetic susceptibility (impaired xenobiotic metabolism), are implicated in neurodegeneration.
  • Understanding gene-environment interactions is crucial for PD research.

Purpose of the Study:

  • To review the role of gene-environment interactions in Parkinson's disease.
  • To explore the utility of Mendelian randomization studies in identifying causal environmental risk factors for PD.
  • To highlight the potential of assessing modifiable risk factors for PD prevention.

Main Methods:

  • Review of existing literature on Parkinson's disease genetics and environmental risk factors.
  • Discussion of classical association studies, including genome-wide association studies (GWAS).
  • Focus on Mendelian randomization as a novel approach to infer causality.

Main Results:

  • Genetic factors alone do not explain the majority of PD cases.
  • Environmental exposures interacting with genetic susceptibility are key in neurodegeneration.
  • Mendelian randomization provides a robust method to assess causality of environmental risk factors.

Conclusions:

  • Gene-environment interactions are critical in the pathogenesis of Parkinson's disease.
  • Mendelian randomization offers significant advantages over traditional methods for investigating environmental risk factors.
  • This approach can help identify modifiable targets for PD prevention and treatment.