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MBE Advance Access originally published online on January 12, 2005
Molecular Biology and Evolution 2005 22(4):976-990; doi:10.1093/molbev/msi082
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Molecular Biology and Evolution vol. 22 no. 4 © Society for Molecular Biology and Evolution 2005; all rights reserved.

Research Article

Mobilization of the Active MITE Transposons mPing and Pong in Rice by Introgression from Wild Rice (Zizania latifolia Griseb.)

Xiaohui Shan*,1, Zhenlan Liu*,1, Zhenying Dong*, Yongming Wang*, Yu Chen*, Xiuyun Lin*, Likun Long*,1, Fangpu Han{dagger}, Yingshan Dong{ddagger} and Bao Liu*

* Laboratory of Molecular Epigenetics, Institute of Genetics and Cytology, Northeast Normal University, Changchun, China; {dagger} Division of Biological Sciences, University of Missouri; and {ddagger} The National Centre of Plant Transgenic Research & Commercialization, Gongzhuling, China

E-mail: baoliu{at}nenu.edu.cn

Hybridization between different species plays an important role in plant genome evolution, as well as is a widely used approach for crop improvement. McClintock has predicted that plant wide hybridization constitutes a "genomic shock" whereby cryptic transposable elements may be activated. However, direct experimental evidence showing a causal relationship between plant wide hybridization and transposon mobilization has not yet been reported. The miniature-Ping (mPing) is a recently isolated active miniature inverted-repeat transposable element transposon from rice, which is mobilized by tissue culture and {gamma}-ray irradiation. We show herein that mPing, together with its putative transposase-encoding partner, Pong, is mobilized in three homologous recombinant inbred lines (RILs), derived from hybridization between rice (cultivar Matsumae) and wild rice (Zizania latifolia Griseb.), harboring introgressed genomic DNA from wild rice. In contrast, both elements remain immobile in two lines sharing the same parentage to the RILs but possessing no introgressed DNA. Thus, we have presented direct evidence that is consistent with McClintock's insight by demonstrating a causal link between wide hybridization and transposon mobilization in rice. In addition, we report an atypical behavior of mPing/Pong mobilization in these lines, i.e., the exclusive absence of footprints after excision.

Key Words: wide hybridization • transposon mobilization • MITEs • genome evolution • rice


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