Genetics, Vol 147, 189-197, Copyright © 1997


INVESTIGATIONS

Evolutionary History of the Sex-Peptide (Acp70A) Gene Region in Drosophila melanogaster

S. Cirera and M. Aguade
Departament de Genetica, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain

In Drosophila the products of the seminal fluid stimulate oviposition and suppress remating in the female. Of all the accessory gland peptides (Acp's) involved in these two responses, the sex-peptide (coded by the Acp70A gene) is among the best characterized at the functional level. A 1.2-kb fragment encompassing the Acp70A gene of nine lines from a natural population of D. melanogaster and one allele of D. sechellia was sequenced to study the forces shaping nucleotide variation within and between species. The coding region of D. simulans and D. mauritiana was also sequenced. A Ser to Ala replacement polymorphism at the last position of the signal peptide was detected in D. melanogaster. The Ser and Ala alleles are at intermediate frequencies. The level of nucleotide variation is lower for the derived Ala allele, which is compatible with a recent origin and an increase in frequency due to positive selection. Variation at the 5' flanking region is structured in two major highly differentiated haplotypes, whose distribution does not conform to neutral expectations. Selective and/or historical factors could contribute to the observed overall patterning of nucleotide variation at the Acp70A region.


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