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Isolation and identification of a non-specific tandemly repeated DNA sequence in Oryza species

Abstract

A tandemly repeated DNA sequence (RRS7) was isolated from Oryza alta (CCDD). RRS7-related sequences were also found tandemly arrayed in genomes AA, BB, BBCC, CC, and EE, and a small amount of RRS7-related sequences were detected in genome FF and the Oryza species with unknown genomes. DNA sequence analysis of the 1844-bp insert of RRS7 revealed that it contained six tandemly repeated units, of which five were 155 bp in length and one was 194 bp in length and contained an imperfect internal 39-bp duplication. Southern blot analysis showed that the boundary sequence contained in RRS7 is a single-copy sequence. A 155-bp consensus sequence derived from the six monomeric repeats contained no internal repeat and showed no significant homology to other currently known sequences. The results of Southern blot and sequence analysis revealed that there are at least two subfamilies present in the RRS7 family; these are represented by the DraI site and the MspI site, respectively. Restriction digestion with two pairs of isoschizomers MboI/Sau3A and MspI/HpaII demonstrated that most of the C residues in the GATC sites and the internal C in the CCGG sites of the RRS7 family in O. Alta were methylated. The usefulness of the RRS7 family in determining the evolutionary relationship of the genome DD and other Oryza genomes is discussed.

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Communicated by M. Koornneef

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Li, X.B., Liang, C.Z., Wu, H.G. et al. Isolation and identification of a non-specific tandemly repeated DNA sequence in Oryza species. Theoret. Appl. Genetics 92, 702–708 (1996). https://doi.org/10.1007/BF00226092

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Key words

  • Oryza
  • Tandemly repeated DNA sequence
  • Restriction fragment length polymorphism (RFLP)