Nuclear rDNA inEuglena gracilis: paucity of chromosomal units and replication of extrachromosomal units | Zendy

Patrick Ravel-Chapuis | Zendy

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Nuclear rDNA inEuglena gracilis: paucity of chromosomal units and replication of extrachromosomal units

Author(s) -

Patrick Ravel-Chapuis

Publication year - 1988

Publication title -

nucleic acids research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 9.008

H-Index - 537

eISSN - 1362-4954

pISSN - 0305-1048

DOI - 10.1093/nar/16.11.4801

Subject(s) - extrachromosomal dna , euglena gracilis , biology , genetics , euglena , ploidy , ribosomal dna , genome , microbiology and biotechnology , gene , phylogenetic tree , chloroplast

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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