Evolutionary flux of P element regulation in a Drosophila melanogaster hybrid dysgenesis cline.
Clines of P-induced hybrid dysgenesis provide a means for monitoring the evolution of transposition repression over space and time. We have studied the molecular and phenotypic profiles of flies taken from a 2900 km cline along the eastern coast of Australia, which had previously been characterized over 10 years ago as having P populations in the north, Q populations at central sites and M' populations in the south. We have found that Q and M' populations of flies have increased their range within the cline at the expense of P lines. Q populations were found to be in the north of the cline and M' populations in the south. Some of the northern Q lines transmit repression through both sexes and type I deletion elements have been isolated from them. We suggest that these elements are responsible for Q type repression. The results support our model that populations made up of Q individuals with strong biparentally transmitted repression form an evolutionarily stable strategy for the repression of hybrid dysgenesis in Drosophila melanogaster.
French
D J
DJ
Department of Genetics, University of Leicester, UK.
Corish
P
P
Shi
M
M
Dover
G A
GA
D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D017931:DNA Primers; D004251:DNA Transposable Elements; D004331:Drosophila melanogaster / Q000235:genetics*; D005260:Female; D006059:Gonadal Dysgenesis; D010641:Phenotype
D017931:DNA Primers; D004251:DNA Transposable Elements