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Nucleic Acids Research, 1985, Vol. 13, No. 20 7529-7537
© 1985

Articles

Extrachromosomal circular nuclear rDNA in Euglena gracilis

Patrick Ravel-Chapuis, Paul Nicolas, Victor Nigon, Odile Neyret1,* and Georges Freyssinet1,+

UA CNRS 92, Département de Biologie Générale et Appliquée, Université Lyon I 69622 Villeurbanne Cedex 1Groupe de Recherche en Biochimie-Biologie Cellulaire et Applications, Université de Limoges 87060 Limoges Cedex, France

Received June 12, 1985. Revised September 19, 1985. Accepted September 19, 1985.

The presence of extrachromosomal nuclear ribosomal DNA (rDNA) in the unicellular alga Euglena gracilis has been established. This rDNA is circular. Each circle is 3.8 µm long and contains one rDNA unit. Oligomers are rare. Extrachromosomal rDNA in present in large amounts during the exponential phase of growth and eppears less abundant during the stationary phase. It was found in all wild-type and mutant strains of Euglena examined. Our estimations suggest that rDNA in Euglena is mainly extrachromosomal. Research of extrachromosomal rDNA in spinach and Petunia was negative.

*Present address: UNICET, BP 11, 69572 Dardilly, France

+Present address: Rhône-Poulenc Agrochimie, Biologie Moléculaire Végétale, BP 9163, 69263 Lyon Cedex, France


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