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Originally published as Genetics Published Articles Ahead of Print on June 14, 2005.
Genetics, Vol. 171, 269-278, September 2005, Copyright © 2005
doi:10.1534/genetics.105.043273
Molecular Evidence for Transcription of Genes on a B Chromosome in Crepis capillaris
Carolyn R. Leach*,
Andreas Houben
,
Bruce Field*,
Klaus Pistrick,
Dmitri Demidov and
Jeremy N. Timmis*,1
* School of Molecular and Biomedical Science (Genetics), The University of Adelaide, Adelaide, South Australia 5005, Australia and Institute of Plant Genetics and Crop Plant Research (IPK), 06466 Gatersleben, Germany
1 Corresponding author: School of Molecular and Biomedical Science (Genetics), The University of Adelaide, Adelaide, SA 5005, Australia.
E-mail: jeremy.timmis{at}adelaide.edu.au
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. B chromosomes are considered to be genetically inert although they appear to cause 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 part of the A and B chromosome rRNA genes, together with comparisons with related species, indicates that the B chromosome rRNA genes originate from the A chromosome.
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