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Evolutionary flux of P element regulation in a Drosophila melanogaster hybrid dysgenesis cline

Published online by Cambridge University Press:  01 June 1999

D. J. FRENCH
Affiliation:
Department of Genetics, Adrian Building, University of Leicester, University Road, Leicester LE1 7RH, UK
P. CORISH
Affiliation:
CRC Chromosome Molecular Biology Group, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
M. SHI
Affiliation:
Department of Genetics, Adrian Building, University of Leicester, University Road, Leicester LE1 7RH, UK
G. A. DOVER
Affiliation:
Department of Genetics, Adrian Building, University of Leicester, University Road, Leicester LE1 7RH, UK
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Abstract

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Clines of P-induced hybrid dysgenesis provide a means for monitoring the evolution of transposition repression over space and time. We have studied the molecular and phenotypic profiles of flies taken from a 2900 km cline along the eastern coast of Australia, which had previously been characterized over 10 years ago as having P populations in the north, Q populations at central sites and M′ populations in the south. We have found that Q and M′ populations of flies have increased their range within the cline at the expense of P lines. Q populations were found to be in the north of the cline and M′ populations in the south. Some of the northern Q lines transmit repression through both sexes and type I deletion elements have been isolated from them. We suggest that these elements are responsible for Q type repression. The results support our model that populations made up of Q individuals with strong biparentally transmitted repression form an evolutionarily stable strategy for the repression of hybrid dysgenesis in Drosophila melanogaster.

Type
Research Article
Copyright
© 1999 Cambridge University Press