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Nucleic Acids Research, 2000, Vol. 28, No. 23 4750-4754
© 2000 Oxford University Press

Mitochondrial RNAs of myxomycetes terminate with non-encoded 3' poly(U) tails

Tamara L. Horton and Laura F. Landweber*

Departments of Ecology and Evolutionary Biology, Molecular Biology, Princeton University, Princeton, NJ 08544, USA

We examined the 3' ends of edited RNAs from the myxomycetes Stemonitis flavogenita and Physarum polycephalum using a modified anchor PCR approach. Surprisingly, we found that poly(A) tails are missing from the cytochrome c oxidase subunit 1 mRNA (coI) from both species and the cytochrome c oxidase subunit 3 mRNA (cox3) from P.polycephalum. Instead, non-encoded poly(U) tails of varying length were discovered at the 3' ends of these transcripts. These are the first described examples of 3' poly(U) tails on mature mRNAs in any system.

* To whom correspondence should be addressed. Tel: +1 609 258 1947; Fax: +1 609 258 1682; Email: lfl{at}princeton.edu Present address: Tamara L. Horton, Laboratory of Molecular Parasitology, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA


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