Allele-Specific Population Structure of Drosophila melanogaster Alcohol Dehydrogenase at the Molecular Level

Corresponding author: Michel Veuille, Laboratoire d’Ecologie, C 237, Université Paris-6, 7 quai Saint Bernard, 75252 Paris cedex 05, France, mveuille{at}snv.jussieu.fr (E-mail).

Communicating editor: A. G. CLARK

The history of the Drosophila melanogaster alcohol dehydrogenase (ADH) Fast/Slow polymorphism was studied by recording molecular variation and inversion polymorphism in 233 chromosomes from European and African populations. Silent molecular variation in the Slow allele was very different between standard chromosomes and chromosomes bearing the In(2L)t inversion. Within populations, inverted Slow haplotypes were more variable than standard Slow haplotypes. Between populations, geographical structure was almost nonexistent for inverted Slow haplotypes and highly significant for standard Slow. All Fast haplotypes occurred on standard chromosomes. They showed little variation within and between populations. They were highly significantly closer to standard Slow haplotypes from Europe. These results suggest that the current range of Fast and In(2L)t Slow haplotypes is recent and that an older genetic differentiation between populations was followed by allele-specific gene flow.

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