Supposed emergence and evolution of class XI subtypes by ancient whole genome duplications. The basal angiosperm Amborella trichopoda (Abt), which diverged before the split of the monocot and the eudicot lineages, encodes a myosin homolog of each of the major five subtypes A’, C’, E’, G’ and H’. The emergence of these myosin-11 subtypes can be explained by three WGDs, of which two are potentially identical with the ϵ and ζ WGD. Alternatively, two of the myosin-11 subtype duplications could be the result of single gene duplications. Subtypes B, D and F, which are present in eudicots but not in monocots, are probably the result of the γ hexaploidy event.
Mühlhausen and Kollmar BMC Evolutionary Biology 2013 13:202 doi:10.1186/1471-2148-13-202