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Related Concept Videos

Heritability01:06

Heritability

Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic" a trait is,...
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
Genetic Variation01:25

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...
Principles of Pharmacogenetics: Types of Genetic Variants01:27

Principles of Pharmacogenetics: Types of Genetic Variants

The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...

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An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Published on: November 3, 2010

Expression level polymorphisms: heritable traits shaping natural variation.

Carolin Delker1, Marcel Quint

  • 1Leibniz Institute of Plant Biochemistry, Independent Junior Research Group, Department of Molecular Signal Processing, Weinberg 3, 06120 Halle (Saale), Germany.

Trends in Plant Science
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

Expression level polymorphisms (ELPs) contribute to adaptive variation, but their full impact is underestimated. More systematic approaches are needed to detect minor or trait-specific ELPs, improving our understanding of genetic variation.

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Systems Biology

Background:

  • Natural populations exhibit significant genetic variation influencing phenotypic diversity.
  • Expression level polymorphisms (ELPs) are known contributors to trait variation, but their broader role in adaptation may be overlooked.
  • Current research often links ELPs to major quantitative trait loci (eQTLs) in central signaling pathways with pleiotropic effects.

Purpose of the Study:

  • To highlight the underappreciated impact of ELPs on adaptive variation.
  • To advocate for more sensitive methods for detecting minor-effect or trait-specific ELPs.
  • To propose refined experimental designs for enhanced eQTL detection.

Main Methods:

  • Systematic approaches to increase detection sensitivity for ELPs.
  • Refinement of experimental designs, including reduction of tissue complexity.
  • Application of combinatorial methods incorporating a priori defined networks.

Main Results:

  • ELPs likely play a more substantial role in adaptive variation than currently recognized.
  • Existing methods may miss minor-effect or trait-specific ELPs.
  • Improved methodologies are crucial for a comprehensive understanding of genetic variation's contribution to adaptation.

Conclusions:

  • The impact of ELPs on adaptive variation warrants further investigation.
  • Developing more sensitive and systematic approaches is essential for uncovering the full spectrum of ELP effects.
  • Refined experimental designs and network-based analyses can improve the detection of subtle genetic influences on traits.