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Minicircular DNA having sequence homologies with chloroplast DNA in a bleached mutant of Euglena gracilis.

Authors
  • Heizmann, P
  • Ravel-Chapuis, P
  • Nigon, V
Type
Published Article
Journal
Current genetics
Publication Date
Nov 01, 1982
Volume
6
Issue
2
Pages
119–122
Identifiers
DOI: 10.1007/BF00435210
PMID: 24186477
Source
Medline
License
Unknown

Abstract

Chloroplast DNA was isolated from total cellular DNA of a bleached mutant of Euglena gracilis (Y3BUD) by enrichment of the light component (p = 1.686) by repeated CsCl equilibrium centrifugations. Electron microscope visualization of this DNA showed minicircular DNA molecules in addition to large circular molecules (42 pm) identical to wild type chloroplast DNA. They were heterogenous in size and their contour lengths ranged from 0.8 to 8.5 μm. Fractionnation by agarose gel electrophoresis gave several discrete bands. Some of them hybridized with pure chloroplast DNA and with several cloned chloroplast DNA fragments, particularly to ribosomal fragments, while others did not show homology with chloroplast DNA being probably of extrachloroplatic origin.

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