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Nucleic Acids Research, Vol 25, Issue 23 4850-4854, Copyright © 1997 by Oxford University Press

ARTICLES

Synthesis and two-dimensional electrophoretic analysis of mixed populations of circular and linear RNAs

PA Feldstein, L Levy, JW Randles and RA Owens
Plant Biology Department, University of Maryland, College Park, MD 20742, USA.

Spontaneous cleavage of the less abundant form of tobacco ringspot virus satellite RNA is readily reversible. Capitalizing on earlier observations by Feldstein and Bruening that small 'mini-monomer' RNAs derived from this molecule and containing little more than covalently attached ribozyme and substrate cleavage products are able to efficiently circularize, we have constructed a series of self- circularizing RNAs of precisely known size. Mixtures of linear and circular RNAs synthesized in vitro and containing 225-1132 nt could be completely resolved using a novel two-dimensional denaturing polyacrylamide gel electrophoresis system. Similar analyses of a complex mixture of coconut cadang-cadang viroid RNAs revealed the presence of relatively large amounts of a previously undescribed 'fast- slow' heterodimeric RNA species in infected palms. Only a single DNA template is required to prepare each pair of circular and linear RNA markers.
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