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Nucleic Acids Research, 1988, Vol. 16, No. 11 4801-4810
© 1988

Articles

Nuclear rDNA in Euglena gracilis: paucity of chromosomal units and replication of extrachromosomal units

Patrick Ravel-Chapuis

Université Lyon I, Laboratoire de Biologie Cellulaire UA CNRS 92, 43 bld du 11 novembre 1918, 69622 Villeurbanne Cedex, France

Received April 7, 1988. Accepted May 3, 1988.

Copy number of chromosomal rDNA units was investigated in two Euglena gracilis wild-type strains. It was established by dot blot analysis that these strains possess about four integrated units per haploid genome. This is the first example of a photosynthetic cell with only a few chromosomal ribosomal genes. In addition to these units, Euglena has 800 to 4000 extrachromosomal rDNA units. Electron microscopy revealed that these free rDNA circles bear a replication origin, and intermediates of replication show a D-loop structure.


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S. J. Greenwood, M. N. Schnare, J. R. Cook, and M. W. Gray
Analysis of intergenic spacer transcripts suggests 'read-around' transcription of the extrachromosomal circular rDNA in Euglena gracilis
Nucleic Acids Res., May 15, 2001; 29(10): 2191 - 2198.
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