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Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)

BACKGROUND: The crustacean class Branchiopoda includes fairy shrimps, clam shrimps, tadpole shrimps, and water fleas. Branchiopods, which are well known for their great variety of reproductive strategies, date back to the Cambrian and extant taxa can be mainly found in freshwater habitats, also incl...

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Autores principales: Luchetti, Andrea, Forni, Giobbe, Skaist, Alyza M., Wheelan, Sarah J., Mantovani, Barbara
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6537178/
https://www.ncbi.nlm.nih.gov/pubmed/31149346
http://dx.doi.org/10.1186/s40851-019-0131-5
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author Luchetti, Andrea
Forni, Giobbe
Skaist, Alyza M.
Wheelan, Sarah J.
Mantovani, Barbara
author_facet Luchetti, Andrea
Forni, Giobbe
Skaist, Alyza M.
Wheelan, Sarah J.
Mantovani, Barbara
author_sort Luchetti, Andrea
collection PubMed
description BACKGROUND: The crustacean class Branchiopoda includes fairy shrimps, clam shrimps, tadpole shrimps, and water fleas. Branchiopods, which are well known for their great variety of reproductive strategies, date back to the Cambrian and extant taxa can be mainly found in freshwater habitats, also including ephemeral ponds. Mitochondrial genomes of the notostracan taxa Lepidurus apus lubbocki (Italy), L. arcticus (Iceland) and Triops cancriformis (an Italian and a Spanish population) are here characterized for the first time and analyzed together with available branchiopod mitogenomes. RESULTS: Overall, branchiopod mitogenomes share the basic structure congruent with the ancestral Pancrustacea model. On the other hand, rearrangements involving tRNAs and the control region are observed among analyzed taxa. Remarkably, an unassigned region in the L. apus lubbocki mitogenome showed a chimeric structure, likely resulting from a non-homologous recombination event between the two flanking trnC and trnY genes. Notably, Anostraca and Onychocaudata mitogenomes showed increased GC content compared to both Notostraca and the common ancestor, and a significantly higher substitution rate, which does not correlate with selective pressures, as suggested by dN/dS values. CONCLUSIONS: Branchiopod mitogenomes appear rather well-conserved, although gene rearrangements have occurred. For the first time, it is reported a putative non-homologous recombination event involving a mitogenome, which produced a pseudogenic tRNA sequence. In addition, in line with data in the literature, we explain the higher substitution rate of Anostraca and Onychocaudata with the inferred GC substitution bias that occurred during their evolution. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s40851-019-0131-5) contains supplementary material, which is available to authorized users.
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spelling pubmed-65371782019-05-30 Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea) Luchetti, Andrea Forni, Giobbe Skaist, Alyza M. Wheelan, Sarah J. Mantovani, Barbara Zoological Lett Research Article BACKGROUND: The crustacean class Branchiopoda includes fairy shrimps, clam shrimps, tadpole shrimps, and water fleas. Branchiopods, which are well known for their great variety of reproductive strategies, date back to the Cambrian and extant taxa can be mainly found in freshwater habitats, also including ephemeral ponds. Mitochondrial genomes of the notostracan taxa Lepidurus apus lubbocki (Italy), L. arcticus (Iceland) and Triops cancriformis (an Italian and a Spanish population) are here characterized for the first time and analyzed together with available branchiopod mitogenomes. RESULTS: Overall, branchiopod mitogenomes share the basic structure congruent with the ancestral Pancrustacea model. On the other hand, rearrangements involving tRNAs and the control region are observed among analyzed taxa. Remarkably, an unassigned region in the L. apus lubbocki mitogenome showed a chimeric structure, likely resulting from a non-homologous recombination event between the two flanking trnC and trnY genes. Notably, Anostraca and Onychocaudata mitogenomes showed increased GC content compared to both Notostraca and the common ancestor, and a significantly higher substitution rate, which does not correlate with selective pressures, as suggested by dN/dS values. CONCLUSIONS: Branchiopod mitogenomes appear rather well-conserved, although gene rearrangements have occurred. For the first time, it is reported a putative non-homologous recombination event involving a mitogenome, which produced a pseudogenic tRNA sequence. In addition, in line with data in the literature, we explain the higher substitution rate of Anostraca and Onychocaudata with the inferred GC substitution bias that occurred during their evolution. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s40851-019-0131-5) contains supplementary material, which is available to authorized users. BioMed Central 2019-05-27 /pmc/articles/PMC6537178/ /pubmed/31149346 http://dx.doi.org/10.1186/s40851-019-0131-5 Text en © The Author(s). 2019 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research Article
Luchetti, Andrea
Forni, Giobbe
Skaist, Alyza M.
Wheelan, Sarah J.
Mantovani, Barbara
Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)
title Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)
title_full Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)
title_fullStr Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)
title_full_unstemmed Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)
title_short Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)
title_sort mitochondrial genome diversity and evolution in branchiopoda (crustacea)
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6537178/
https://www.ncbi.nlm.nih.gov/pubmed/31149346
http://dx.doi.org/10.1186/s40851-019-0131-5
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