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Nucleic Acids Research, 1985, Vol. 13, No. 11 3861-3871
© 1985

Articles

A new copia-like transposable element found in a Drosophila rDNA gene unit

Jeffrey R. Bell, Alicia M. Bogardus, Thomas Schmidt* and Maria Pellegrini

Molecular Biology Section, University of Southern California Los Angeles, CA 90089-1481, USA *Zoologisches Institut der Universitat Winterthurerstrasse 190, 8057 Zurich, Switzerland

Received April 9, 1985. Accepted May 6, 1985.

We have discovered a member of a new family of copia-like transposable elements inserted into the non-transcribed spacer between two ribosomal genes (rDNA). This family, which we call 3S18, consists of at least 15 elements which are scattered throughout the Drosophila melanogaster genome. The elements of this family are approximately 6.5 kb long and have 0.5 kb terminal direct repeats. All of the elements appear to have the same restriction sites. The element 1s mobile as the size pattern of homologous fragments varies among different strains. In situ hybridization results confirm the scattered location and transposable qualities of 3S18. The element 1s not transcribed into abundant RNA


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