Quantifying the relative contributions of the X chromosome, autosomes, and mitochondrial genome to local adaptation
Clementine Lasne, Belinda Van Heerwaarden, Carla M Sgro, Tim Connallon
EVOLUTION | WILEY | Published : 2019
During local adaptation with gene flow, some regions of the genome are inherently more responsive to selection than others. Recent theory predicts that X-linked genes should disproportionately contribute to local adaptation relative to other genomic regions, yet this prediction remains to be tested. We carried out a multigeneration crossing scheme, using two cline-end populations of Drosophila melanogaster, to estimate the relative contributions of the X chromosome, autosomes, and mitochondrial genome to divergence in four traits involved in local adaptation (wing size, resistance to heat, desiccation, and starvation stresses). We found that the mitochondrial genome and autosomes contributed..View full abstract
We are grateful to Fiona Cockerell, Teresa Kutz, Chris Allan, Sonia Sanchez, Michael Roast, Felix Zajitschek, Hariz Ahmad, Taylor Graham, and Oscar Formoso for assistance with fly maintenance and phenotyping scoring, and to Damian Dowling, the AE, and two anonymous reviewers for valuable comments and suggestions on an earlier version of the manuscript. Support for this research was provided by the School of Biological Sciences at Monash University and the Australian Research Council.