Abstract
The utility of chemically synthesized deoxyoligonucleotides as hybridization probes for the detection of tRNA genes has been examined. Chloroplast tRNA genes were chosen for this study. Deoxyoligonucleotides complementary to highly conserved regions of chloroplast tRNA genes of both higher plants and Euglena gracilis were chemically synthesized. These synthetic probes have been used to detect tRNA genes by Southern hybridizations to restriction fragments of chloroplast DNAs. This new method of tRNA gene mapping and the oligonucleotides synthesized may be of general application to many chloroplast genomes. This is illustrated by the detection of known and unknown tRNA genes of Euglena gracilis and spinach, and unknown tRNA genes of maize and cucumber chloroplast DNAs. The precise locus and polarity of the Euglena gracilis chloroplast tRNAPhe gene has been determined. We also describe experiments which relate to the effects of the time of hybridization, the stringency of washing, and of base pair mismatches on the hybridization signal.
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