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Originally published as Genetics Published Articles Ahead of Print on May 23, 2005.
Genetics, Vol. 170, 1231-1238, July 2005, Copyright © 2005
doi:10.1534/genetics.105.041087
Sobo, a Recently Amplified Satellite Repeat of Potato, and Its Implications for the Origin of Tandemly Repeated Sequences
Ahmet L. Tek*,
Junqi Song*,
Jiri Macas
and
Jiming Jiang*,1
* Department of Horticulture, University of Wisconsin, Madison, Wisconsin 53706
Institute of Plant Molecular Biology, Branisovska 31, Ceske Budejovice CZ-37005, Czech Republic
1 Corresponding author: Department of Horticulture, University of Wisconsin, 1575 Linden Dr., Madison, WI 53706.
E-mail: jjiang1{at}wisc.edu
Highly repetitive satellite DNA sequences are main components of heterochromatin in higher eukaryotic genomes. It is well known that satellite repeats can expand and contract dramatically, which may result in significant genome size variation among genetically related species. The origin of satellite repeats, however, is elusive. Here we report a satellite repeat, Sobo, from a diploid potato species, Solanum bulbocastanum. The Sobo repeat is mapped to a single location in the pericentromeric region of chromosome 7. This single Sobo locus spans 
360 kb of a 4.7-kb monomer. Sequence analysis revealed that the major part of the Sobo monomer shares significant sequence similarity with the long terminal repeats (LTRs) of a retrotransposon. The Sobo repeat was not detected in other Solanum species and is absent in some S. bulbocastanum accessions. Sobo monomers are highly homogenized and share >99% sequence identity. These results suggest that the Sobo repeat is a recently emerged satellite and possibly originated by a sudden amplification of a genomic region including the LTR of a retrotransposon and its flanking genomic sequences.
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