The latitudinal cline in the In(3R)Payne inversion polymorphism has shifted in the last 20 years in Australian Drosophila melanogaster populations.
Clinal variation has been described in a number of inversions in Drosophila but these clines are often characterized by cytological techniques using small sample sizes, and associations with specific genes are rarely considered. Here we have developed a molecular assay for In(3R)Payne in Drosophila melanogaster from eastern Australia populations. It shows in repeated samples that the inversion cline is very tightly associated with latitude and is almost fixed in tropical populations while relatively rare in temperate populations. This steep cline has shifted in position in the last 20 years. The heat shock gene, hsr-omega, located centrally inside the inversion sequence, shows a different clinal pattern to In(3R)Payne. These results suggest strong ongoing selection on In(3R)Payne over the last 100 years since the colonization of Australia that is partly independent of hsr-omega.
Anderson
Alisha R
AR
Centre for Environmental Stress and Adaptation Research, School of Biological Sciences, Monash University, Victoria 3800, Australia. alisha.anderson@sci.monash.edu.au
Hoffmann
Ary A
AA
McKechnie
Stephen W
SW
Umina
Paul A
PA
Weeks
Andrew R
AR
D000818:Animals; D001315:Australia; D007446:Chromosome Inversion / Q000235:genetics*; D017931:DNA Primers; D003710:Demography; D004331:Drosophila melanogaster / Q000235:genetics*; D005819:Genetic Markers / Q000235:genetics; D005828:Genetics, Population; D005838:Genotype; D005843:Geography; D006360:Heat-Shock Proteins / Q000235:genetics*; D015810:Linkage Disequilibrium; D020641:Polymorphism, Single Nucleotide; D011157:Population Dynamics; D012044:Regression Analysis
D017931:DNA Primers; D005819:Genetic Markers; D006360:Heat-Shock Proteins