Genetics, Vol 132, 755-770, Copyright © 1992

INVESTIGATIONS

Polymorphism and Divergence in the Mst26A Male Accessory Gland Gene Region in Drosophila

M. Aguade, N. Miyashita and C. H. Langley
Department de Genetica, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain

Drosophila males, like males of most other insects, transfer a group of specific proteins to the females during mating. These proteins are produced primarily in the accessory gland and are likely to influence the female's reproduction. The results of studies of DNA sequence polymorphism and divergence in two genes coding for male accessory gland proteins of Drosophila are reported here. The Mst26Aa and Mst26Ab transcription units are tandemly arranged in a {complex}1.6-kb segment in Drosophila sechellia, Drosophila mauritiana and Drosophila simulans as they were reported to be in Drosophila melanogaster. The DNA sequences of 10 alleles from D. melanogaster and one allele each from the three sibling species reveals a high degree of amino acid replacement variation. A substantial part of the variation is due to insertion/deletion differences. Possible functional significance of these amino acid sequence changes is discussed. Statistical analyses based on the neutral theory of molecular evolution show that the distribution of polymorphism over the 1.6-kb region is inconsistent with the pattern of divergence between the species. The amount of 4-cutter restriction map polymorphism in a larger sample of 75 alleles from the same D. melanogaster population is similar to that obtained from the DNA sequence of the 10 alleles (a pairwise average of 0.007 difference per site). The 6-cutter restriction map survey of a 18-kb region containing the Mst26A genes indicates that polymorphism in the region flanking these genes maybe higher. The failure of polymorphisms and divergence in the Mst26A region to conform to the expectations of a simple mutation-drift-equilibrium model indicates that selection in or near this region has played a role in the history of these genes.


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