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Malkócs T, Viricel A, Becquet V, Evin L, Dubillot E, Pante E. Complex mitogenomic rearrangements within the Pectinidae (Mollusca: Bivalvia). BMC Ecol Evol 2022; 22:29. [PMID: 35272625 PMCID: PMC8915466 DOI: 10.1186/s12862-022-01976-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 11/18/2021] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Scallops (Bivalvia: Pectinidae) present extraordinary variance in both mitochondrial genome size, structure and content, even when compared to the extreme diversity documented within Mollusca and Bivalvia. In pectinids, mitogenome rearrangements involve protein coding and rRNA genes along with tRNAs, and different genome organization patterns can be observed even at the level of Tribes. Existing pectinid phylogenies fail to resolve some relationships in the family, Chlamydinae being an especially problematic group. RESULTS In our study, we sequenced, annotated and characterized the mitochondrial genome of a member of Chlamydinae, Mimachlamys varia-a species of commercial interest and an effective bioindicator-revealing yet another novel gene arrangement in the Pectinidae. The phylogeny based on all mitochondrial protein coding and rRNA genes suggests the paraphyly of the Mimachlamys genus, further commending the taxonomic revision of the classification within the Chlamydinae subfamily. At the scale of the Pectinidae, we found that 15 sequence blocks are involved in mitogenome rearrangements, which behave as separate units. CONCLUSIONS Our study reveals incongruities between phylogenies based on mitochondrial protein-coding versus rRNA genes within the Pectinidae, suggesting that locus sampling affects phylogenetic inference at the scale of the family. We also conclude that the available taxon sampling does not allow for understanding of the mechanisms responsible for the high variability of mitogenome architecture observed in the Pectinidae, and that unraveling these processes will require denser taxon sampling.
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Affiliation(s)
- Tamás Malkócs
- Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-Université de La Rochelle, 2 Rue Olympe de Gouges, 17042, La Rochelle Cedex 01, France. .,Pál Juhász-Nagy Doctoral School of Biology and Environmental Sciences, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary. .,Institute of Biology and Ecology, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary. .,Institute of Aquatic Ecology, Centre for Ecological Research, 4026, Debrecen, Hungary.
| | - Amélia Viricel
- Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-Université de La Rochelle, 2 Rue Olympe de Gouges, 17042, La Rochelle Cedex 01, France
| | - Vanessa Becquet
- Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-Université de La Rochelle, 2 Rue Olympe de Gouges, 17042, La Rochelle Cedex 01, France
| | - Louise Evin
- Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-Université de La Rochelle, 2 Rue Olympe de Gouges, 17042, La Rochelle Cedex 01, France
| | - Emmanuel Dubillot
- Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-Université de La Rochelle, 2 Rue Olympe de Gouges, 17042, La Rochelle Cedex 01, France
| | - Eric Pante
- Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-Université de La Rochelle, 2 Rue Olympe de Gouges, 17042, La Rochelle Cedex 01, France
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