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Plant Physiol, December 2002, Vol. 130, pp. 1697-1705
Dasheng and RIRE2. A Nonautonomous Long
Terminal Repeat Element and Its Putative Autonomous Partner in
the Rice Genome1
Ning
Jiang,
I. King
Jordan, and
Susan R.
Wessler*
Department of Plant Biology, University of Georgia, Athens, Georgia
30602 (N.J., S.R.W.); and National Center for Biotechnology
Information, National Institutes of Health, Bethesda, Maryland 20894 (I.K.J.)
Dasheng is one of the highest copy number
long terminal repeat elements and one of the most recent elements to
amplify in the rice (Oryza sativa) genome.
However, the absence of any significant coding capacity for retroviral
proteins, including gag and pol, suggests
that Dasheng is a nonautonomous element. Here, we have exploited the availability of 360 Mb of rice genomic sequence to
identify a candidate autonomous element. RIRE2 is a
previously described gypsy-like long terminal repeat
retrotransposon with significant sequence similarity to
Dasheng in the regions where putative cis factors for
retrotransposition are thought to be located. Dasheng
and RIRE2 elements have similar chromosomal distribution patterns and similar target site sequences, suggesting that they use
the same transposition machinery. In addition, the presence of several
RIRE2-Dasheng element chimeras in the
genome is consistent with the copackaging of element mRNAs in the same
virus-like particle. Finally, both families have recently amplified
members, suggesting that they could have been co-expressed, a necessary
prerequisite for RIRE2 to serve as the source of
transposition machinery for Dasheng. Consistent with
this hypothesis, transcripts from both elements were found in the same
expressed sequence tag library.
1
This study was supported by the U.S. Department
of Energy (grant to S.R.W.) and by the National Science Foundation
(grant to S.R.W.).
*
Corresponding author; e-mail sue{at}dogwood.botany.uga.edu;
fax 706-542-1805.
© 2002 American Society of Plant Biologists
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