Rates of molecular evolution and tests of positive selection were based on the set of orthologous genes identified in D. melanogaster, D. biarmipes, D. takahashi, D. suzukii, and D. ananassae.
MEGA [ 52- 55] http://www.megasoftware.net/ is an integrated tool for conducting automatic and manual sequence alignment, inferring phylogenetic trees, mining web-based databases, estimating rates of molecular evolution, and testing evolutionary hypotheses.
Here, a tree including a non-opsin outgroup was constrained to reflect the best topology consistent with Tree 1B in figure 3. Assuming this tree and the best-fit model of opsin molecular evolution from prot-test analysis [51], we simulated 100 data sets using SeqGen [58].
Our results provide robust candidate genes for future functional tests and molecular evolution comparison with other mammals to fully understand the mechanisms of wing formation and the evolution of bat flight.
Owing to an incomplete genome sequence, tests of molecular evolution have been relatively limited in tomato, although they include loci involved in pathogen resistance (e.g. Caicedo and Schaal 2004; Rose et al. 2007).
For the phylogenetic analysis, Modeltest 3.06 was run to determine the appropriate model of molecular evolution in a likelihood ratio test framework.
Database URL: http://www.bioinf.wits.ac.za/software/fire/evodb Hypothesis testing in molecular evolution and phylogenetics depends upon accurate sequence alignments.
For comparing rates of molecular evolution, a Bayesian Relative Rates test [ 115] was conducted using a custom R script (Additional file 5).
In future, perhaps with the instruction of in silico results like this, some experiments (e.g. based on in vitro molecular evolution) could be designed to test these evolving processes involving "replication parsimony", at various aspects.
We tested for a significant association between parasitism and rate of molecular evolution using a Wilcoxon signed ranks test in the SPlus package v8.2.
