Data for: ‘Drifting’ Buchnera genomes track the microevolutionary trajectories of their aphid hosts

This repository comprises code and scripts needed to recreate the analyses
presented in the manuscript: Thia et al. 'Drifting’ Buchnera genomes
track the microevolutionary trajectories of their aphid hosts. 
This study explores the coevolution between the endosymbiont Buchnera and
its aphid host in the aphid species, Myzus persicae, the green peach
aphid. Evidence that Buchnera is polymorphic within aphid clones indicates
that these symbionts exist as populations of different strains within a
single aphid. Strong signals of genomic covariation were observed between
both organisms. However, genomic variation in either organism was not
associated with geography or the host plant. Further examination of
protein-coding SNPs in Buchnera found that the number of non-synonymous to
synonymous mutations were on average comparable (ratio ~1), with similar
site frequency spectra of alleles in both mutation classes. Our results
suggest that Buchnera within Myzus persicae are largely evolving
under neutral processes. This study provides a unique population genetics
perspective of Buchnera-aphid host coevolution on a microevolutionary
scale.