PMID: 10899457Jul 19, 2000

The piggyBac element is capable of precise excision and transposition in cells and embryos of the mosquito, Anopheles gambiae

Insect Biochemistry and Molecular Biology
G L GrossmanM Q Benedict

Abstract

The piggyBac transposable element was tested for transposition activity in plasmid-based excision and inter-plasmid transposition assays to determine if this element would function in Anopheles gambiae cells and embryos. In the Mos55 cell line, precise excision of the piggyBac element was observed only in the presence of a helper plasmid. Excision occurred at a rate of 1 event per 1000 donor plasmids screened. Precise excision of the piggyBac element was also observed in injected An. gambiae embryos, but at a lower rate of 1 excision per 5000 donor plasmids. Transposition of the marked piggyBac element into a target plasmid occurred in An. gambiae cells at a rate of 1 transposition event per 24,000 donor plasmids. The piggyBac element transposed in a precise manner, with the TTAA target site being duplicated upon insertion, in 56% of transpositions observed, and only in the presence of the piggyBac helper. The remaining transpositions resulted in a deletion of target sequence, a novel observation for the phenomenon of piggyBac element insertion. 'Hot spots' for insertion into the target plasmid were observed, with 25 of 34 events involving one particular site. These results are the first demonstration of the precise mobility of...Continue Reading

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Related Concepts

Embryo
Genes, Insect
Pyotraumatic Dermatitis
Transposition of Intestine (Disorder)
Gene Deletion Abnormality
Cellular Transposition
Malaria
Malaria Vaccines
Anopheles gambiae
Deletion Mutation

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