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doi:10.1534/genetics.105.043273
A more recent version of this article appeared on September 1, 2005.
REGULAR RESEARCH PAPERS |
Molecular evidence for transcription of genes on a B chromosome in Crepis capillaris
Carolyn R Leach 1, Andreas Houben 2, Bruce Field 1, Klaus Pistrick 2, Dmitri Demidov 2 and Jeremy N Timmis 1*
1 The University of Adelaide
2 IPK, Gaterleben
* To whom correspondence should be addressed. E-mail: jeremy.timmis{at}adelaide.edu.au.
Submitted on March 14, 2005
Revised on April 8, 2005
Accepted on 1 May 2005
Dispensable, supernumerary (B) chromosomes are found in diverse eukaryotic species. The origin and genetic consequences of B chromosomes have been the subjects of speculation for more than a century. Until now, there has been no molecular evidence that B chromosome DNA is transcribed and there is no unequivocal evidence as to their origin. They are considered to be genetically inert though they appear to show a variety of phenotypic effects. We report that members of one of two ribosomal RNA gene families that are confined to the B chromosomes of a plant, Crepis capillaris, are transcribed - thus providing the first molecular evidence of gene activity on B chromosomes. Sequence analysis of A and B chromosome rDNA, together with comparisons with related species, indicates that the B chromosome rDNA originates from the A chromosome.
Key Words: B chromosomes, Crepis capillaris, concerted evolution, ribosomal RNA genes, transcription
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