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Electrophoretic variant forms of a set of follicle cell proteins in Drosophila melanogaster: frequencies in wild-type strains and response in a selection experiment.

A screen of 110 geographic Drosophila melanogaster wild-type strains was performed, in order to discover more electrophoretic variant forms than the three previously described variant forms of a set of stage- and tissuespecific ovarian proteins. These proteins have tentatively been called Fc proteins, as they are synthesized by the ovarian follicle cells. We report a fourth Fc variant form, found in this screen. The Fc variant form described as the standard form (Fcl) is by far the most frequent in the wild-type strains covered by this screen. The results also suggest a very high degree of polymorphism for Fc proteins in natural populations. The change in frequency of the Fcl standard form has been followed for 32 weeks in a selection experiment. A selective advantage of the Fcl form might be inferred from these results. However, a continuation of the selection experiment is required to confirm this supposal.