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Originally published as Genetics Published Articles Ahead of Print on September 2, 2005.
Genetics, Vol. 171, 2139-2142, December 2005, Copyright © 2005
doi:10.1534/genetics.105.047357
Allele-Specific, Bidirectional Silencing of an Alcohol Dehydrogenase Gene in Different Organs of Interspecific Diploid Cotton Hybrids
Keith L. Adams*,1 and
Jonathan F. Wendel
* UBC Botanical Garden, Centre for Plant Research and Department of Botany, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada and Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, Iowa 50011
1 Corresponding author: Department of Botany, University of British Columbia, 6270 University Blvd., Vancouver, BC V6T 1Z4, Canada.
E-mail: keitha{at}interchange.ubc.ca
Interspecific hybridization is a common and important process that generates phenotypic novelty and can lead to hybrid speciation as well as to changes in gene expression. Using two different interspecific cotton (Gossypium) diploid hybrids, we show organ-specific, bidirectional allelic silencing at a heterozygous Adh locus, with alternate alleles being silenced in leaves and many floral organs, respectively. These results show that developmental regulation of gene expression is changed immediately upon hybridization between diploid species, possibly due to epigenetic factors or regulatory mismatch.
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