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. 1992 Nov;12(11):5268–5279. doi: 10.1128/mcb.12.11.5268

Expression of chimeric genes by the light-regulated cabII-1 promoter in Chlamydomonas reinhardtii: a cabII-1/nit1 gene functions as a dominant selectable marker in a nit1- nit2- strain.

J E Blankenship 1, K L Kindle 1
PMCID: PMC360460  PMID: 1406696

Abstract

In Chlamydomonas reinhardtii, expression of the cabII-1 gene increases dramatically in response to light (cabII-1 encodes one of the light-harvesting chlorophyll a/b-binding proteins of photosystem II). We have used a region upstream of the cabII-1 gene in translational fusions to the bacterial uidA gene (encodes beta-glucuronidase) and transcriptional fusions to the Chlamydomonas nitrate reductase gene (nit1). Chlamydomonas transformants carrying intact copies of the chimeric uidA gene do not express beta-glucuronidase at the level of enzyme activity or mRNA accumulation. Methylation in the cabII-1 promoter region of the introduced gene is extensive in these strains, suggesting that newly introduced foreign genes may be recognized and silenced by a cellular mechanism that is correlated with increased methylation. Transformants that express the chimeric cabII-1/nit1 gene have been recovered. In contrast to the endogenous nit1 gene, the chimeric cabII-1/nit1 gene is expressed in ammonium-containing medium. Moreover, nit1 mRNA accumulation is dramatically stimulated by light, with a time course that is indistinguishable from that of the endogenous cabII-1 gene. The cabII-1/nit1 gene has been used to select transformants in a nit1- nit2- Chlamydomonas strain (CC400G) and should be useful for transformation of the large number of mutants in the Ebersold-Levine lineage, which carry the same mutations.

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