2019/10/29 by Lafond, Manuel, Hellmuth, Marc
#Combinatorics (math.CO) #Data Structures and Algorithms (cs.DS) #Discrete Mathematics (cs.DM) #FOS: Computer and information sciences #FOS: Mathematics
paper · doi:10.48550/arxiv.1910.13123
The history of gene families -- which are equivalent to event-labeled gene trees -- can to some extent be reconstructed from empirically estimated evolutionary event-relations containing pairs of orthologous, paralogous or xenologous genes. The question then arises as whether inferred event-labeled gene trees are "biologically feasible" which is the case if one can find a species tree with which the gene tree can be reconciled in a time-consistent way. In this contribution, we consider event-labeled gene trees that contain speciation, duplication as well as horizontal gene transfer and we assume that the species tree is unknown. We provide a cubic-time algorithm to decide whether a "time-consistent" binary species for a given event-labeled gene tree exists and, in the affirmative case, to construct the species tree within the same time-complexity.