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Related Concept Videos

Multiple Allele Traits01:49

Multiple Allele Traits

The Concept of Multiple Allelism
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...
Epistasis01:39

Epistasis

In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
Multiple Allele Traits01:49

Multiple Allele Traits

The Concept of Multiple Allelism
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...
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...

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Related Experiment Video

Updated: May 7, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
10:17

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

Published on: November 3, 2010

Epistasis and balanced polymorphism influencing complex trait variation.

Juergen Kroymann1, Thomas Mitchell-Olds

  • 1Max Planck Institute for Chemical Ecology, Department of Genetics & Evolution, Hans-Knoell-Str. 8, D-07745 Jena, Germany. kroymann@ice.mpg.de

Nature
|May 6, 2005
PubMed
Summary
This summary is machine-generated.

Small-effect quantitative trait loci (QTL) contribute significantly to complex traits. This study found two growth rate QTL in a small Arabidopsis thaliana interval, revealing complex genetic interactions and potential balancing selection.

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Area of Science:

  • Plant genetics
  • Quantitative trait genetics
  • Population genetics

Background:

  • Complex traits are influenced by numerous genes (polygenic), but small-effect quantitative trait loci (QTL) remain understudied.
  • Understanding the genetic architecture of complex traits is crucial for fields like agriculture and medicine.

Purpose of the Study:

  • To investigate the genetic complexity within a small chromosomal interval in Arabidopsis thaliana.
  • To identify and characterize quantitative trait loci (QTL) for growth rate and their interactions.

Main Methods:

  • Dissection of a one-centimorgan chromosomal interval in Arabidopsis thaliana.
  • Analysis of historical sequence polymorphism within the interval across different accessions.
  • Identification of growth rate QTL and assessment of their epistatic interactions.

Main Results:

  • Two growth rate QTL were identified within a 210-kilobase region, indicating high genetic complexity in a small genomic area.
  • Both QTL exhibited epistasis, meaning their effects were dependent on the genetic background.
  • One QTL mapped to a single gene showing a nucleotide signature of balancing selection, with context-dependent phenotypic effects.

Conclusions:

  • The findings suggest a highly polygenic architecture for quantitative trait variation, exceeding previous documentation.
  • Non-neutral epistatic polymorphism may play a significant role in the genetic variation of complex traits.
  • This study highlights the importance of considering small-effect QTL and gene-environment interactions in understanding complex traits.