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Molecular Biology and Evolution, Vol 10, 127-139, Copyright © 1993 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Molecular evolution of a repetitive region within the per gene of Drosophila

AA Peixoto, S Campesan, R Costa and CP Kyriacou
Department of Genetics, University of Leicester, United Kingdom.

The clock gene period (per) controls a number of biological rhythms in Drosophila. In D. melanogaster, per has a repetitive region that encodes a number of alternating threonine-glycine residues. We sequenced and compared this region from several different Drosophila species belonging to various groups within the Drosophila and Sophophora subgenera. This part of per shows a great variability in both DNA sequence and length. Furthermore, analysis of the data suggests that changes in the length of this variable region might be associated with amino acid replacements in the more conserved flanking sequences.
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