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Mol Cell Biol. 1990 March; 10(3): 1084-1094

Stable transfection of the human parasite Leishmania major delineates a 30-kilobase region sufficient for extrachromosomal replication and expression.

G M Kapler, C M Coburn and S M Beverley

Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115.

ABSTRACT

To delineate segments of the genome of the human protozoan parasite Leishmania major necessary for replication and expression, we developed a vector (pR-NEO) which can be reproducibly introduced into L. major. This DNA was derived from a 30-kilobase extrachromosomal amplified DNA bearing the dihydrofolate reductase-thymidylate synthase gene, with the coding region for neomycin phosphotransferase substituted for that of dihydrofolate reductase-thymidylate synthase and a bacterial origin of replication and selectable marker added. G418-resistant lines were obtained at high efficiency by electroporation of pR-NEO (approaching 10(-4) per cell), while constructs bearing an inverted neo gene or lacking Leishmania sequences did not confer resistance. pR-NEO replicated in L. major and gave rise to correctly processed transcripts bearing the trans-spliced miniexon. Molecular karyotype analysis showed that in some lines pR-NEO DNA exists exclusively as an extrachromosomal circle, a finding supported by the rescue of intact pR-NEO after transformation of Escherichia coli. These data genetically localize all elements required in cis for DNA replication, transcription, and trans splicing to the Leishmania DNA contained within pR-NEO DNA and signal the advent of stable transfection methodology for addressing molecular phenomena in trypanosomatid parasites.

Mol Cell Biol. 1990 March; 10(3): 1084-1094




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