Stress-induced rearrangement of Fusarium retrotransposon sequences |
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Authors: | N Anaya and M I G Roncero |
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Institution: | (1) Departamento de Genética, Facultad de Ciencias, Universidad de Córdoba, Avda. San Alberto Magno s/n, E-14071 Córdoba, Spain, ES |
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Abstract: | Rearrangement of Fusarium oxysporum retro- transposon skippy was induced by growth in the presence of potassium chlorate. Three fungal strains, one sensitive to chlorate (Co60) and two
resistant to chlorate and deficient for nitrate reductase (Co65 and Co94), were studied by Southern analysis of their genomic
DNA. Polymorphism was detected in their hybridization banding pattern, relative to the wild type grown in the absence of chlorate,
using various enzymes with or without restriction sites within the retrotransposon. Results were consistent with the assumption
that three different events had occurred in strain Co60: genomic amplification of skippy yielding tandem arrays of the element, generation of new skippy sequences, and deletion of skippy sequences. Amplification of Co60 genomic DNA using the polymerase chain reaction and divergent primers derived from the retrotransposon
generated a new band, corresponding to one long terminal repeat plus flanking sequences, that was not present in the wild-type
strain. Molecular analysis of nitrate reductase-deficient mutants showed that generation and deletion of skippy sequences, but not genomic amplification in tandem repeats, had occurred in their genomes.
Received: 29 March 1996 / Accepted: 29 June 1996 |
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Keywords: | Fusarium oxysporum niaD mutants Genomyic amplification Retrotransposon LTR |
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