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Comparison of the regulation of P elements in M and M′ strains of Drosophila melanogaster

Published online by Cambridge University Press:  14 April 2009

Stéphane Ronsseray ,
Monique Lehmann  and
Georges Periquet
Stéphane Ronsseray*
Affiliation:
Laboratoire de Génétique des Populations, Universités Paris6 et 7, Tour 42, 2 place jussieu, F75005 Paris, France
Monique Lehmann
Affiliation:
Laboratoire de Génétique des Populations, Universités Paris6 et 7, Tour 42, 2 place jussieu, F75005 Paris, France
Georges Periquet
Affiliation:
Laboratoire de Biocénotique Expérimentale des Agrosystèmes, Faculté des Sciences, Parc Grandmont, 37200 Tours, France
*
* Corresponding author.
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Summary

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M and M′ strains of Drosophila melanogaster in the P-M system of hybrid dysgenesis were compared in two series of tests, with the following results. (1) The singed-weak hypermutability regulation test showed that M′ strains had lower P excision rates than M strains, suggesting that P-elements repression must occur in M′ strains although it is not detectable by gonadal dysgenesis assays. (2) The evolution of mixed P + M and mixed P + M′ populations was compared, using a strong P strain. The P + M cultures invariably evolved in a few generations into strong P cultures, while the P + M′ cultures evolved into P-type cultures with reduced P-factor potentials. However, after 30 generations of culture, both these types of mixed cultures had similar P copy numbers, suggesting that regulation of copy number had occurred in them.

Type
Research Article
Information
Genetics Research , Volume 54 , Issue 1 , August 1989 , pp. 13 - 22
Copyright
Copyright © Cambridge University Press 1989

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