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. 1980 Sep;77(9):5302–5306. doi: 10.1073/pnas.77.9.5302

Molecular cloning and characterization of potato spindle tuber viroid cDNA sequences

Robert A Owens *, Dean E Cress †
PMCID: PMC350046  PMID: 16592877

Abstract

Double-stranded cDNA has been synthesized from a polyadenylylated potato spindle tuber viroid (PSTV) template and inserted in the Pst I endonuclease site of plasmid pBR322 by using the oligo(dC)·oligo(dG)-tailing procedure. Tetracycline-resistant ampicillin-sensitive transformants contained sequences complementary to PSTV [32P]cDNA, and one recombinant clone (pDC-29) contains a 460-base-pair insert. This cloned double-stranded PSTV cDNA contains the cleavage sites for six restriction endonucleases predicted by the published primary sequence of PSTV as well as one additional site each for Ava I, Hae III, Hpa II, and Sma I. The additional Ava I, Hpa II, and Sma I sites are explained by the presence of a second C-C-C-G-G-G sequence in the cloned double-stranded cDNA. The largest fragment released by Hae III digestion contains approximately 360 base pairs. These results suggest that we have cloned almost the entire sequence of PSTV, but the sequence cloned differs slightly from that published. Hybridization probes derived from pDC-29 insert have allowed detection and preliminary characterization of RNA molecules having the same size as PSTV but the opposite polarity. This RNA is present during PSTV replication in infected tomato cells.

Keywords: viroids, recombinant DNA, complementary RNA

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