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Journal of Heredity Advance Access published online on March 5, 2009
Journal of Heredity, doi:10.1093/jhered/esp003
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© The American Genetic Association. 2009. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Brief Communication

Coordinated and Fine-Scale Control of Homoeologous Gene Expression in Allotetraploid Cotton

Lex E. Flagel, Liping Chen, Bhupendra Chaudhary, and Jonathan F. Wendel

From the Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011

Address correspondence to Jonathan F. Wendel at the address above, or e-mail: flagel{at}iastate.edu.

Within polyploid plant species, it has been demonstrated that homoeologous genes (genes duplicated by polyploidy) often display dynamic expression patterns. To determine if chromosomal location plays a role in establishing these expression patterns, we analyzed the relative levels of homoeolog expression among linked genes from 2 locations in the cotton genome. Genes from the region containing the alcohol dehydrogenase A gene show coordinated expression across several tissues, whereas genes from the region containing cellulose synthase A do not. These results indicate that changes in homoeolog expression may be constrained by linkage in some genomic regions, whereas in other regions, homoeolog expression is largely decoupled from physical proximity. Furthermore, these results suggest that both large- and small-scale regulatory mechanisms may control homoeolog expression patterns.

Key Words: cotton • duplicate gene expression • Gossypium hirsutum • linkage • polyploidy

Corresponding Editor: John Burke

Received December 3, 2008
Revised February 3, 2009
Accepted February 3, 2009


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