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Nucleic Acids Research, 1989, Vol. 17, No. 3 1019-1034
© 1989

MOLECULAR BIOLOGY

A structural analysis of P.polycephalum U1 RNA at the RNA and gene levels. Are there differentially expressed U1 RNA genes in P.polycephalum ? U1 RNA evolution

Evelyne Myslinski, F.-Xavier Wilhelm1 and Christiane Branlant*

Laboratoire d'Enzymologie et de Génie Génétique, Université de Nancy 1 U.A. CNRS 457, BP 239 54506, Vandoeuvre les Nancy cedex 1Institut de Biologie Moléculaire et Cellulaire du CNRS 15 rue Rene Descartes, 67084 Strasbourg cedex, France

*To whom correspondence should be addressed

Received October 26, 1988. Revised January 5, 1989. Accepted January 5, 1989.

U1 RNAs were isolated from P.polycephalum microplasmodia nuclei and sequenced. A P.polycephalum gene coding for U1 RNA was also isolated. The coding region of this gene differs at 3 positions compared to the isolated U1 RNA species. Both isolated RNAs and the gene encoded RNA can be folded according to the secondary structure model previously proposed for U1 RNA. Putative regulatory elements very similar to those required for efficient transcription of U RNA genes from vertebrates, in particular, the –200 distal enhancer element, are present in the flanking regions of this gene. The presence of several Ul RNA genes in P.polycephalum was confirmed by Southern blot analysis of genomic DNA. In contrast to yeast S.cerevisiae U1 RNA, P.polycephalum U1 RNAs have a length similar to that of U1 RNAs from higher eukaryotes. Nevertheless, P.polycephalum U1 RNAs probably differ from these RNAs in the 5'-terminal segment supposed to base-pair with the 5'-end of introns. The results are discussed taking into account phylogenetic evolution and fonctional role of U1 RNA.


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