2019 journal article
A Single, Shared Triploidy in Three Species of Parasitic Nematodes
G3-GENES GENOMES GENETICS, 10(1), 225–233.
author keywords: polyploidy; evolutionary model; root-knot nematode
MeSH headings : Animals; Evolution, Molecular; Genome, Helminth; Phylogeny; Triploidy; Tylenchoidea / classification; Tylenchoidea / genetics
TL;DR:
Three root-knot nematodes of the genus Meloidogyne descend from a single common hybridization event that yielded triplicated genomes with three distinguishable subgenomes, and ancestral loci where two of the three gene copies have been lost are less likely to have orthologs in Caenorhabditis elegans that are lethal when knocked down than are ancestral locu with surviving duplicate copies.
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Source: Web Of Science
Added: January 21, 2020
Abstract The root-knot nematodes of the genus Meloidogyne are important and damaging parasites capable of infecting most flowering plants. Within this genus, several species of the Meloidogyne incognita group show evidence of paleopolyploidy in their genomes. We used our software tool POInT, the Polyploidy Orthology Inference Tool, to phylogenetically model the gene losses that followed that polyploidy. These models, and simulations based on them, show that three of these species (M. incognita, M. arenaria and M. javanica) descend from a single common hybridization event that yielded triplicated genomes with three distinguishable subgenomes. While one of the three subgenomes shows elevated gene loss rates relative to the other two, this subgenome does not show elevated sequence divergence. In all three species, ancestral loci where two of the three gene copies have been lost are less likely to have orthologs in Caenorhabditis elegans that are lethal when knocked down than are ancestral loci with surviving duplicate copies.