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Publication : Incomplete lineage sorting and phenotypic evolution in marsupials.

First Author  Feng S Year  2022
Journal  Cell Volume  185
Issue  10 Pages  1646-1660.e18
PubMed ID  35447073 Mgi Jnum  J:324930
Mgi Id  MGI:7281632 Doi  10.1016/j.cell.2022.03.034
Citation  Feng S, et al. (2022) Incomplete lineage sorting and phenotypic evolution in marsupials. Cell 185(10):1646-1660.e18
abstractText  Incomplete lineage sorting (ILS) makes ancestral genetic polymorphisms persist during rapid speciation events, inducing incongruences between gene trees and species trees. ILS has complicated phylogenetic inference in many lineages, including hominids. However, we lack empirical evidence that ILS leads to incongruent phenotypic variation. Here, we performed phylogenomic analyses to show that the South American monito del monte is the sister lineage of all Australian marsupials, although over 31% of its genome is closer to the Diprotodontia than to other Australian groups due to ILS during ancient radiation. Pervasive conflicting phylogenetic signals across the whole genome are consistent with some of the morphological variation among extant marsupials. We detected hundreds of genes that experienced stochastic fixation during ILS, encoding the same amino acids in non-sister species. Using functional experiments, we confirm how ILS may have directly contributed to hemiplasy in morphological traits that were established during rapid marsupial speciation ca. 60 mya.
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