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Plant Cell Advance Online Publication
Published on July 18, 2002; 10.1105/tpc.003079

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Received March 13, 2002
Accepted May 6, 2002

Functional Rice Centromeres Are Marked by a Satellite Repeat and a Centromere-Specific Retrotransposon

Zhukuan Cheng 1, Fenggao Dong 1, Tim Langdon 2, Shu Ouyang 3, C. Robin Buell 3, Minghong Gu 4, Frederick R. Blattner 5, and Jiming Jiang 1*

1 Department of Horticulture, University of Wisconsin-Madison, Madison, Wisconsin 53706
2 Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, United Kingdom
3 The Institute for Genomic Research, 9712 Medical Center Drive, Rockville, Maryland 20850
4 Department of Agronomy, Yangzhou University, Yangzhou 225009, People's Republic of China
5 Department of Genetics, University of Wisconsin-Madison, Madison, Wisconsin 53706

* To whom correspondence should be addressed. E-mail: jjiang1{at}facstaff.wisc.edu.

The centromere of eukaryotic chromosomes is essential for the faithful segregation and inheritance of genetic information. In the majority of eukaryotic species, centromeres are associated with highly repetitive DNA, and as a consequence, the boundary for a functional centromere is difficult to define. In this study, we demonstrate that the centers of rice centromeres are occupied by a 155-bp satellite repeat, CentO, and a centromere-specific retrotransposon, CRR. The CentO satellite is located within the chromosomal regions to which the spindle fibers attach. CentO is quantitatively variable among the 12 rice centromeres, ranging from 65 kb to 2 Mb, and is interrupted irregularly by CRR elements. The break points of 14 rice centromere misdivision events were mapped to the middle of the CentO arrays, suggesting that the CentO satellite is located within the functional domain of rice centromeres. Our results demonstrate that the CentO satellite may be a key DNA element for rice centromere function.






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