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Abstract
Arsenite-resistant variants of a trypanosomatid protozoan, Leishmania mexicana amazonensis, were selected in vitro by stepwise increases of sodium arsenite concentrations up to 30 μ M in the culture medium. These variants were found to contain amplified DNA as extrachromosomal supercoiled molecules of about 69 kb. They originate from a single chromosome in the wild-type cells. There is evidence of chromosomal changes in these cells associated with the selection for arsenite resistance. The apparent absence of these circular molecules in the wild type and their loss from the drug-sensitive revertants suggest amplification of chromosomal DNA into these extrachromosomal circles as the mechanism of arsenite resistance.
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