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Plant Molecular Biology

, Volume 52, Issue 4, pp 761–773 | Cite as

Transgene structures in T-DNA-inserted rice plants

  • Sung-Ryul Kim
  • Jinwon Lee
  • Sung-Hoon Jun
  • Sunhee Park
  • Hong-Gyu Kang
  • Soontae Kwon
  • Gynheung An
Article

Abstract

T-DNA is commonly used for delivery of foreign genes and as an insertional mutagen. Although ample information exists regarding T-DNA organization in dicotyledonous plants, little is known about the monocot rice. Here, we investigated the structure of T-DNA in a large number of transgenic rice plants. Analysis of the T-DNA borders revealed that more than half of the right ends were at the cleavage site, whereas the left ends were not conserved and were deleted up to 180 bp from the left border (LB) cleavage site. Three types of junctions were found between T-DNA and genomic DNA. In the first, up to seven nucleotide overlaps were present. The frequency of this type was much higher in the LB region than at the right border (RB). In the second type, which was more frequent in RB, the link was direct, without any overlaps or filler DNA. Finally, the third type showed filler DNA between T-DNA and the plant sequences. Out of 171 samples examined, 77 carried the vector backbone sequence, with the majority caused by the failure of T-strand termination at LB. However, a significant portion also resulted from co-integration of T-DNA and the vector backbone to a single locus. Most linkages between T-DNA and the vector backbone were formed between two 3′ ends or two 5′ ends of the transferred DNAs. The 3′ ends were mostly linked through 3–6 bp of the complementing sequence, whereas the 5′ ends were linked through either precise junctions or imprecise junctions with filler DNA.

border flanking sequence Oryza sativa repeat rice T-DNA integration vector backbone 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Sung-Ryul Kim
    • 1
    • 2
  • Jinwon Lee
    • 1
  • Sung-Hoon Jun
    • 1
  • Sunhee Park
    • 1
  • Hong-Gyu Kang
    • 1
  • Soontae Kwon
    • 2
  • Gynheung An
    • 1
  1. 1.National Research Laboratory of Plant Functional Genomics, Division of Molecular and Life SciencesPohang University of Science and Technology (POSTECH)PohangRepublic of Korea
  2. 2.Department of Horticulture and BreedingAndong National UniversityAndongRepublic of Korea

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