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The Boundaries of Partially Edited Transcripts are not Conserved in Kinetoplastids: Implications for the Guide RNA Model of Editing

Laura F. Landweber, Alexander G. Fiks and Walter Gilbert
Proceedings of the National Academy of Sciences of the United States of America
Vol. 90, No. 20 (Oct. 15, 1993), pp. 9242-9246
Stable URL: http://www.jstor.org/stable/2363129
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Boundaries of Partially Edited Transcripts are not Conserved in Kinetoplastids: Implications for the Guide RNA Model of Editing
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Abstract

We have studied partially edited molecules for the cytochrome-c oxidase subunit III (COIII) transcript from two species of the insect trypanosome Herpetomonas. We found unexpected patterns of editing, in which editing does not proceed strictly 3' to 5', in 24 of 61 partially edited clones. A comparison of the partially edited molecules between the two kinetoplastid species revealed an 8- to 10-nt shift in precisely defined editing boundaries, sites at which editing pauses before binding of the next guide RNA after formation of a stable duplex between a guide RNA and mRNA. This suggests that the region of base pairing between individual guide RNAs and the COIII transcript is not strictly conserved in kinetoplastids, implying gradual evolution of the editing process.

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