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Nucleic Acids Research, 1989, Vol. 17, No. 12 4579-4588
© 1989

MOLECULAR BIOLOGY

Molecular cloning of a Drosophila potential Z-DNA forming sequence hybridizing in situ to a developmentally regulated subdivision of the polytene chromosomes

Antonio Jimenez–Ruiz, José M. Requena, Francesca Lancillotti, Gracia Morales, Manuel C. Lopez and Carlos Alonso

Centra de Biologia Molecular CSIC-UAM, 28049 Madrid, Spain

Received March 15, 1989. Revised May 22, 1989. Accepted May 22, 1989.

We describe the selection of a group of plasmids with potential to form Z-DNA, from libraries of Drosophila hydei nuclear DNA using anti Z-DNA monoclonal (22) or polyclonal (10c) antibodies. The supercoiled closed circular forms of most of the selected recombinant plasmids from the 10c Z-DNA library show affinity to the polyclonal 10c antibody as indicated by DNA binding assays. One of these plasmids, pF17, was selected for further study. The insert in this plasmid adopts the Z conformation at bacterial supercoiled density. Analysis of deletion plasmids indicates that a Z-epitope is located within a short fragment of the insert in which 3 GC repetitions are found. The Drosophila DNA insert in pF17 hybridizes in situ with locus 4-75C1-2 of the polytene chromosomes, a locus whose transcriptional activity is developmentally regulated during the third instar.


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[Abstract] [Full Text]


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