Abstract
A chimeric gene composed of the coding sequence of theble gene fromStreptoalloteichus hindustanus fused to the 5′ and 3′ untranslated regions of theChlamydomonas reinhardtii nuclear geneRBCS2 has been constructed. Introduction of this chimeric gene into the nuclear genome ofC. reinhardtii by co-transformation with theARG7 marker yields Arg+ transformants of which approximately 80% possess theble gene. Of these co-transformants, approximately 3% display a phleomycin-resistant (PmR) phenotype. Western blot analysis using antibodies against theble gene product confirms the presence of the protein in the PmR transformants and genetic analysis demonstrates the co-segregation of theble gene with the phenotype in progeny arising from the mating of a PmR transformant to wild-type strains. Direct selection of PmR transformants was achieved by allowing an 18-h period for recovery and growth of transformed cells prior to selection. This work represents the first demonstration of stable expression and inheritance of a foreign gene in the nuclear genome ofC. reinhardtii and provides a useful dominant marker for nuclear transformation.
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Communicated by E. Cerdá-Olmedo
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Stevens, D.R., Purton, S. & Rochaix, J.D. The bacterial phleomycin resistance geneble as a dominant selectable marker inChlamydomonas . Molec. Gen. Genet. 251, 23–30 (1996). https://doi.org/10.1007/BF02174340
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DOI: https://doi.org/10.1007/BF02174340