Transformation of Mucor miehei results in plasmid deletion and phenotypic instability

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Abstract

Mucor miehei transformants resistant to geneticin have been obtained by treatment of protoplasts with different plasmids and by Agrobacterium-mediated DNA transfer. All transformants exhibited a very unstable phenotype whose maintenance required continuous selective pressure. Molecular analysis of transformants showed that the plasmid DNA was extensively modified and maintained in very low amount. Our results indicate that M. miehei reluctance to transformation is due to different causes, including the coenocytic nature of its mycelium and the existence of specific mechanisms for the detection and elimination of foreign DNA. © 2003 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.

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Monfort, A., Cordero, L., Maicas, S., & Polaina, J. (2003). Transformation of Mucor miehei results in plasmid deletion and phenotypic instability. FEMS Microbiology Letters, 224(1), 101–106. https://doi.org/10.1016/S0378-1097(03)00421-X

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