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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.

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Updated: Jun 23, 2026

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

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

Published on: November 3, 2010

Genomic expression dominance in allopolyploids.

Ryan A Rapp¹, Joshua A Udall, Jonathan F Wendel

¹Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, Iowa 50010, USA. rrapp@iastate.edu

|May 5, 2009

Summary

This summary is machine-generated.

Allopolyploid speciation involves rapid genome reconciliation. In cotton (Gossypium L.), allopolyploids exhibit genome-wide expression dominance, where gene expression matches one parent, offering evolutionary insights.

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Area of Science:

Plant genetics
Genomics
Evolutionary biology

Background:

Allopolyploid speciation necessitates rapid evolutionary adaptation of genomes and gene regulatory networks.
Investigates global gene expression patterns during genomic merger and doubling in inter-specific cotton crosses (Gossypium L.).

Purpose of the Study:

To characterize gene expression dynamics in diploid and allopolyploid cotton species.
To understand the mechanisms of genome dominance and its evolutionary implications.

Main Methods:

Utilized a microarray platform targeting 40,430 unigenes.
Assayed gene expression in diploid parents and their colchicine-doubled allopolyploid derivatives.

Main Results:

Significant differential gene expression observed among diploid congeners (up to 50% of genes).
Allopolyploids displayed genome-wide expression dominance, with expression levels matching one parent.
Expression dominance occurred irrespective of expression magnitude, direction (up/down-regulation), or parental contribution.

Conclusions:

Provides novel insights into gene expression architecture within allopolyploid nuclei.
Raises questions about the mechanisms driving genome dominance.
Offers clues to the evolutionary prevalence of allopolyploids.