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Article

Scarcity of ars sequences isolated in a morphogenesis mutant of the yeast Yarrowia lipolytica

Ph. Fournier

Lab. Génétique INRA, Centre de Biotechnologies Agro‐Industrielles, 78850 Thiverval‐Grignon, France

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L. Guyaneux

Lab. Génétique INRA, Centre de Biotechnologies Agro‐Industrielles, 78850 Thiverval‐Grignon, France

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M. Chasles

Lab. Génétique INRA, Centre de Biotechnologies Agro‐Industrielles, 78850 Thiverval‐Grignon, France

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C. Gaillardin

Corresponding Author

Lab. Génétique INRA, Centre de Biotechnologies Agro‐Industrielles, 78850 Thiverval‐Grignon, France

Lab. Génétique INRA, Centre de Biotechnologies Agro‐Industrielles, 78850 Thiverval‐Grignon, France
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First published: January 1991
Cited by: 20

Abstract

Previous attempts to isolate autonomously replicating sequences (ars) from the dimorphic yeast Yarrowia lipolytica have been unsuccessful. We isolated a Fil mutant unable to produce hyphae and growing only in a yeast form to facilitate ars isolation. This mutant was transformed with a Y. lipolytica DNA bank and several unstable clones were obtained. Extrachromosomal plasmids were evidenced in yeast recovered in Escherichia coli and characterized by restriction mapping. They were able to retransform Fil and Fil+ yeast strains at high frequency and transformants displayed a slightly unstable phenotype. The detailed analysis of the plasmids showed that only two different ars sequences had been isolated, each of them corresponding to a unique sequence in the Y. lipolytica genome. We concluded that functional ars sequences that can be cloned on plasmids are rare in this yeast.

Number of times cited: 20

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