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The first mitochondrial genomes of endosymbiotic rhabdocoels illustrate evolutionary relaxation of atp8 and genome plasticity in flatworms

M. Monnens, S. Thijs, AG. Briscoe, M. Clark, EJ. Frost, DTJ. Littlewood, M. Sewell, K. Smeets, T. Artois, MPM. Vanhove

. 2020 ; 162 (-) : 454-469. [pub] 20200606

Jazyk angličtina Země Nizozemsko

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc21011927

The first three mitochondrial (mt) genomes of endosymbiotic turbellarian flatworms are characterised for the rhabdocoels Graffilla buccinicola, Syndesmis echinorum and S. kurakaikina. Interspecific comparison of the three newly obtained sequences and the only previously characterised rhabdocoel, the free-living species Bothromesostoma personatum, reveals high mt genomic variability, including numerous rearrangements. The first intrageneric comparison within rhabdocoels shows that gene order is not fully conserved even between congeneric species. Atp8, until recently assumed absent in flatworms, was putatively annotated in two sequences. Selection pressure was tested in a phylogenetic framework and is shown to be significantly relaxed in this and another protein-coding gene: cox1. If present, atp8 appears highly derived in platyhelminths and its functionality needs to be addressed in future research. Our findings for the first time allude to a large degree of undiscovered (mt) genomic plasticity in rhabdocoels. It merits further attention whether this variation is correlated with a symbiotic lifestyle. Our results illustrate that this phenomenon is widespread in flatworms as a whole and not exclusive to the better-studied neodermatans.

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$a Monnens, Marlies $u Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium. Electronic address: marlies.monnens@uhasselt.be
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$a The first mitochondrial genomes of endosymbiotic rhabdocoels illustrate evolutionary relaxation of atp8 and genome plasticity in flatworms / $c M. Monnens, S. Thijs, AG. Briscoe, M. Clark, EJ. Frost, DTJ. Littlewood, M. Sewell, K. Smeets, T. Artois, MPM. Vanhove
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$a The first three mitochondrial (mt) genomes of endosymbiotic turbellarian flatworms are characterised for the rhabdocoels Graffilla buccinicola, Syndesmis echinorum and S. kurakaikina. Interspecific comparison of the three newly obtained sequences and the only previously characterised rhabdocoel, the free-living species Bothromesostoma personatum, reveals high mt genomic variability, including numerous rearrangements. The first intrageneric comparison within rhabdocoels shows that gene order is not fully conserved even between congeneric species. Atp8, until recently assumed absent in flatworms, was putatively annotated in two sequences. Selection pressure was tested in a phylogenetic framework and is shown to be significantly relaxed in this and another protein-coding gene: cox1. If present, atp8 appears highly derived in platyhelminths and its functionality needs to be addressed in future research. Our findings for the first time allude to a large degree of undiscovered (mt) genomic plasticity in rhabdocoels. It merits further attention whether this variation is correlated with a symbiotic lifestyle. Our results illustrate that this phenomenon is widespread in flatworms as a whole and not exclusive to the better-studied neodermatans.
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$a Thijs, Sofie $u Hasselt University, Centre for Environmental Sciences, Research Group Environmental Biology, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium. Electronic address: sofie.thijs@uhasselt.be
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$a Briscoe, Andrew G $u Department of Life Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom. Electronic address: a.briscoe@nhm.ac.uk
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$a Clark, Miriam $u School of Biological Sciences, University of Auckland, New Zealand. Electronic address: clarkrmb@gmail.com
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$a Frost, Emily Joy $u School of Biological Sciences, University of Auckland, New Zealand. Electronic address: efro833@aucklanduni.ac.nz
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$a Littlewood, D Tim J $u Department of Life Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom. Electronic address: t.littlewood@nhm.ac.uk
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$a Sewell, Mary $u School of Biological Sciences, University of Auckland, New Zealand. Electronic address: m.sewell@auckland.ac.nz
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$a Smeets, Karen $u Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium. Electronic address: karen.smeets@uhasselt.be
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$a Artois, Tom $u Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium. Electronic address: tom.artois@uhasselt.be
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$a Vanhove, Maarten P M $u Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium; Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Charles Deberiotstraat 32, B-3000 Leuven, Belgium; Zoology Unit, Finnish Museum of Natural History, University of Helsinki, P.O. Box 17, Helsinki FI-00014, Finland; Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic. Electronic address: maarten.vanhove@uhasselt.be
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