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Related Concept Videos

Gene-Environment Interactions01:20

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...
Genetic Material01:20

Genetic Material

Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
Structure of a Gene01:30

Structure of a Gene

A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...
Human Genetics01:28

Human Genetics

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.
The complex relationship between genetics and psychology is observable through common biological components such...
Epistasis Analysis01:09

Epistasis Analysis

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...
Pharmacogenetics and Pharmacogenomics: Overview01:29

Pharmacogenetics and Pharmacogenomics: Overview

Pharmacogenetics and pharmacogenomics examine how genetic factors influence an individual's response to drugs. While pharmacogenetics focuses on the impact of specific genetic variants on drug effects, pharmacogenomics takes a broader approach, studying how genetic variation across populations contributes to differences in drug responses. These fields aim to explain why individuals may experience varying levels of efficacy or adverse reactions to the same medication.Variability in drug...

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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
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Gene-nutrient and gene-physical activity summary--genetics viewpoint.

Craig H Warden1, Janis S Fisler

  • 1Rowe Program in Genetics, Department of Pediatrics, Division of Clinical Nutrition, Endocrinology and Vascular Biology, and Section of Neurobiology, Physiology, and Behavior, Davis, California, USA. chwarden@ucdavis.edu

Obesity (Silver Spring, Md.)
|December 17, 2008
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Summary

Genetics significantly impacts how individuals respond to diet and exercise. While specific genes influence weight changes, personalized nutrition and exercise plans are not yet possible due to current research limitations.

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Area of Science:

  • Human genetics
  • Nutrigenetics
  • Exercise genetics
  • Animal models in research

Background:

  • Evidence suggests natural genetic variations (alleles) substantially influence individual responses to nutritional interventions and physical activity.
  • Human and animal studies demonstrate a genetic component to body weight regulation in response to dietary changes and exercise.
  • Animal models, particularly rodents, are crucial for dissecting the mechanisms underlying gene-diet and gene-exercise interactions.

Purpose of the Study:

  • To review existing literature on the genetic influences on nutrition and exercise response.
  • To discuss the strengths and limitations of human genetic studies and animal models in this field.
  • To identify future research needs for advancing personalized nutrition and exercise recommendations.

Main Methods:

  • Literature review of human genetic studies and animal model research.
  • Discussion on the impact of phenotype measurement precision (e.g., body mass index vs. fat mass) in human genetic studies.
  • Evaluation of whole genome association studies (WGS) and the utility of animal models for mechanistic insights.

Main Results:

  • Genetics plays a significant role in individual variability in response to diet and exercise.
  • Human studies link specific genes to body weight changes from over/underfeeding and exercise.
  • Animal models confirm genetic control over diet and exercise responsiveness, though gaps exist in diet restriction studies.

Conclusions:

  • Genetics is a major determinant of response to diet and exercise.
  • Current scientific understanding is insufficient for providing individualized diet and exercise recommendations.
  • Advancements require enhanced human phenotyping technologies and whole genome sequencing in both humans and animal models.