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Title: The draft genome of Kipferlia bialata reveals reductive genome evolution in fornicate parasites
Authors: Tanifuji, Goro
Takabayashi, Shun
Kume, Keitaro
Takagi, Mizue
Nakayama, Takuro
Kamikawa, Ryoma  kyouindb  KAKEN_id
Inagaki, Yuji
Hashimoto, Tetsuo
Author's alias: 神川, 龍馬
Issue Date: 28-Mar-2018
Publisher: Public Library of Science (PLoS)
Journal title: PLOS ONE
Volume: 13
Issue: 3
Thesis number: e0194487
Abstract: The fornicata (fornicates) is a eukaryotic group known to consist of free-living and parasitic organisms. Genome datasets of two model fornicate parasites Giardia intestinalis and Spironucleus salmonicida are well annotated, so far. The nuclear genomes of G. intestinalis assemblages and S. salmonicida are small in terms of the genome size and simple in genome structure. However, an ancestral genomic structure and gene contents, from which genomes of the fornicate parasites have evolved, remains to be clarified. In order to understand genome evolution in fornicates, here, we present the draft genome sequence of a free-living fornicate, Kipferlia bialata, the divergence of which is earlier than those of the fornicate parasites, and compare it to the genomes of G. intestinalis and S. salmonicida. Our data show that the number of protein genes and introns in K. bialata genome are the most abundant in the genomes of three fornicates, reflecting an ancestral state of fornicate genome evolution. Evasion mechanisms of host immunity found in G. intestinalis and S. salmonicida are absent in the K. bialata genome, suggesting that the two parasites acquired the complex membrane surface proteins on the line leading to the common ancestor of G. intestinalis and S. salmonicida after the divergence from K. bialata. Furthermore, the mitochondrion related organelles (MROs) of K. bialata possess more complex suites of metabolic pathways than those in Giardia and in Spironucleus. In sum, our results unveil the process of reductive evolution which shaped the current genomes in two model fornicate parasites G. intestinalis and S. salmonicida.
Rights: © 2018 Tanifuji et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
URI: http://hdl.handle.net/2433/231088
DOI(Published Version): 10.1371/journal.pone.0194487
PubMed ID: 29590215
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