Molecular analysis of the P-M gonadal dysgenesis cline in eastern Australian Drosophila melanogaster.
The latitudinal cline in P-M gonadal dysgenesis potential in eastern Australia has been shown to comprise three regions which are, from north to south respectively, P, Q, and M, with the P-to-Q and Q-to-M transitions occurring over relatively short distances. The P element complements of 30 lines from different regions of the cline were determined by molecular techniques. The total amount of P element-hybridizing DNA was high in all lines, and it did not correlate in any obvious way with the P-M phenotypes of individual lines. The number of potentially full-sized P elements per genome was high in lines from the P regions, but variable or low among lines from the Q and M regions, and thus declined overall from north to south. A particular P element deletion-derivative, the KP element, occurred in all the tested lines. The number of KP elements was low in lines from the P region, much higher in lines from the Q region, and highest among lines from the M region, thus forming a cline reciprocal to that of the full-sized P elements. Another transposable element, hobo, which has been described as causing dysgenic traits similar to those of P-M hybrid dysgenesis, was shown to be present in all lines and to vary among them in number, but not in any latitudinal pattern. The P-M cline in gonadal dysgenesis potential can be inferred to be based on underlying clinal patterns of genomic P element complements. P activity of a line was positively correlated with the number of full-sized P elements in the line, and negatively correlated with the number of KP elements. Among Q and M lines, regulatory ability was not correlated with numbers of KP elements.
Boussy
I A
IA
Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721.
Healy
M J
MJ
Oakeshott
J G
JG
Kidwell
M G
MG
D000818:Animals; D001315:Australia; D004262:DNA Restriction Enzymes / Q000235:genetics; D004251:DNA Transposable Elements; D004331:Drosophila melanogaster / Q000235:genetics*; D005828:Genetics, Population; D006059:Gonadal Dysgenesis / Q000235:genetics*
D004251:DNA Transposable Elements; D004262:DNA Restriction Enzymes