Natural Variation in a Drosophila Clock Gene and Temperature Compensation

Author:

Sawyer Lesley A.12,Hennessy J. Michael12,Peixoto Alexandre A.12,Rosato Ezio12,Parkinson Helen12,Costa Rodolfo12,Kyriacou Charalambos P.12

Affiliation:

1. L. A. Sawyer, J. M. Hennessy, A. A. Peixoto, E. Rosato, H. Parkinson, C. P. Kyriacou, Department of Genetics, University of Leicester, LE1 7RH, UK.

2. R. Costa, Dipartimento di Biologia, Universitá di Padova, Via Trieste 75, 35121 Padova, Italy.

Abstract

The threonine-glycine (Thr-Gly) encoding repeat within the clock gene period of Drosophila melanogaster is polymorphic in length. The two major variants (Thr-Gly)17 and (Thr-Gly)20 are distributed as a highly significant latitudinal cline in Europe and North Africa. Thr-Gly length variation from both wild-caught and transgenic individuals is related to the flies' ability to maintain a circadian period at different temperatures. This phenomenon provides a selective explanation for the geographical distribution of Thr-Gly lengths and gives a rare glimpse of the interplay between molecular polymorphism, behavior, population biology, and natural selection.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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