Data from: Wolbachia-induced meiotic drive and feminization is associated with an independent occurrence of selective mitochondrial sweep in a butterfly

Maternally inherited Wolbachia endosymbionts manipulate arthropod
reproduction in various ways. In the butterfly Eurema mandarina, a
cytoplasmic incompatibility-inducing Wolbachia strain wCI and the
associated mtDNA haplotypes are known to originate from the sister species
Eurema hecabe, which offered a good case study for microbe-mediated hybrid
introgression. Besides wCI, some females with the Z0 karyotype harbour a
distinct Wolbachia strain wFem, which causes all-female production by
meiotic drive and feminization. We report that a considerable proportion
of E. mandarina females (65.7%) were infected with both wCI and wFem (CF)
on Tanegashima Island. While females singly infected with wCI (C) produced
offspring at a 1 : 1 sex ratio, CF females produced only females. Although
Z-linked sequence polymorphism showed no signs of divergence between C and
CF females, mtDNA split into two discrete clades; one consisted of C
females and the other CF females, both of which formed a clade with E.
hecabe but not with uninfected E. mandarina. This suggests that CF
matrilines also, but independently, experienced a selective sweep after
hybrid introgression from E. hecabe. Distinct evolutionary forces were
suggested to have caused C and CF matrilines to diverge, which would be
irreversible because of the particular phenotype of wFem.