DOI: 10.5061/dryad.465v3
title: Data from: Shared selective pressure and local genomic landscape lead to repeatable patterns of genomic divergence in sunflowers

description: The repeated evolution of traits in organisms facing similar environmental
 conditions is considered to be fundamental evidence for the role of
 natural selection in moulding phenotypes. Yet, aside from case studies of
 parallel evolution and its genetic basis, the repeatability of evolution
 at the level of the whole genome remains poorly characterized. Here,
 through the use of transcriptome sequencing, we examined genomic
 divergence for three pairs of sister species of sunflowers. Two of the
 pairs (Helianthus petiolaris – H. debilis and H. annuus – H. argophyllus)
 have diverged along a similar latitudinal gradient and presumably
 experienced similar selective pressure. In contrast, a third species pair
 (H. exilis – H. bolanderi) diverged along a longitudinal gradient.
 Analyses of divergence, as measured in terms of FST, indicated little
 repeatability across the three pairs of species for individual genetic
 markers (SNPs), modest repeatability at the level of individual genes and
 the highest repeatability when large regions of the genome were compared.
 As expected, higher repeatability was observed for the two species pairs
 that have diverged along a similar latitudinal gradient, with genes
 involved in flowering time among the most divergent genes. Genes showing
 extreme low or high differentiation were more similar than genes showing
 medium levels of divergence, implying that both purifying and divergent
 selection contributed to repeatable patterns of divergence. The location
 of a gene along the chromosome also predicted divergence levels,
 presumably because of shared heterogeneity in both recombination and
 mutation rates. In conclusion, repeated genome evolution appeared to
 result from both similar selective pressures and shared local genomic
 landscapes.
description: ann_arg_fst_mapContains: all SNPs kept in the H. annuus - H. argophyllus comparison, name of reference gene, position of SNP in gene, genotypes of all individuals, Fst, Fit, Fis, name, linkage group, position in centimorgan, unique position on map, number of nucleotides in gene, boolean value whether SNP is in the top5% most divergent.bol_exi_fst_mapContains: all SNPs kept in the H. exilis - H. bolanderi comparison, name of reference gene, position of SNP in gene, genotypes of all individuals, Fst, Fit, Fis, name, linkage group, position in centimorgan, unique position on map, number of nucleotides in gene, boolean value whether SNP is in the top5% most divergent.deb_pet_fst_mapContains: all SNPs kept in the H. debilis - H. petiolaris comparison, name of reference gene, position of SNP in gene, genotypes of all individuals, Fst, Fit, Fis, name, linkage group, position in centimorgan, unique position on map, number of nucleotides in gene, boolean value whether SNP is in the top5% most divergent.unique_SNPContains a list of all SNPs found in either one of the three species pairs. List contains unique name (gene name and position concatenated) and the fst value for all three species pairs.unique_genesContains list of all unique polymorphic genes found in either of the three species pairs, and the fst value for all three species pairs.ann_arg_fst_map_dnds.outContains list of all polymorphic genes in H. annuus - H. argophyllus species pairs and dn, ds, dn/ds values.bol_exi_fst_map_dndsContains list of all polymorphic genes in H. exilis - H. bolanderi species pairs and dn, ds, dn/ds values.deb_pet_fst_map_dndsContains list of all polymorphic genes in H. debilis - H. petiolaris species pairs and dn, ds, dn/ds values.ann_arg_fst_map_cluster_nonoverlapping_windowsContains list for H. annuus - H. argophyllus of all unique positions in the genetic map, linkage groups, associated fst valuse, and other various statistics (not used in this study, but part of the original script).bol_exi_fst_map_cluster_nonoverlapping_windowsContains list for H. exilis - H. bolanderi of all unique positions in the genetic map, linkage groups, associated fst valuse, and other various statistics (not used in this study, but part of the original script).deb_pet_fst_map_cluster_nonoverlapping_windowsContains list for H. debilis - H. petiolaris of all unique positions in the genetic map, linkage groups, associated fst valuse, and other various statistics (not used in this study, but part of the original script).