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Originally published as Genetics Published Articles Ahead of Print on March 31, 2005.
Genetics, Vol. 170, 807-812, June 2005, Copyright © 2005
doi:10.1534/genetics.104.040055
Crossover Interference on Nucleolus Organizing Region-Bearing Chromosomes in Arabidopsis
Sandy Y. Lam*,
Sarah R. Horn*,
Sarah J. Radford
,
Elizabeth A. Housworth
,
Franklin W. Stahl
and
Gregory P. Copenhaver*,1
* Department of Biology and The Carolina Center for Genome Sciences, University of North Carolina, Chapel Hill, North Carolina 27599
Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, North Carolina 27599
Department of Mathematics and Department of Biology, Indiana University, Bloomington, Indiana 47405
Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403-1229
1 Corresponding author: Department of Biology and The Carolina Center for Genome Sciences, Campus Box 3280, Coker Hall 305, University of North Carolina, Chapel Hill, NC 27499.
E-mail: gcopenhaver{at}bio.unc.edu
In most eukaryotes, crossovers are not independently distributed along the length of a chromosome. Instead, they appear to avoid close proximity to one another—a phenomenon known as crossover interference. Previously, for three of the five Arabidopsis chromosomes, we measured the strength of interference and suggested a model wherein some crossovers experience interference while others do not. Here we show, using the same model, that the fraction of interference-insensitive crossovers is significantly smaller on the remaining two chromosomes. Since these two chromosomes bear the Arabidopsis NOR domains, the possibility that these chromosomal regions influence interference is discussed.
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