Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)
Abstract 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, a...
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| Format: | Article |
| Language: | English |
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BMC
2019-05-01
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| Series: | Zoological Letters |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s40851-019-0131-5 |
| _version_ | 1828888895222185984 |
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| author | Andrea Luchetti Giobbe Forni Alyza M. Skaist Sarah J. Wheelan Barbara Mantovani |
| author_facet | Andrea Luchetti Giobbe Forni Alyza M. Skaist Sarah J. Wheelan Barbara Mantovani |
| author_sort | Andrea Luchetti |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-12-13T12:31:46Z |
| format | Article |
| id | doaj.art-ce125834dff2424a9a733ee741b1700a |
| institution | Directory Open Access Journal |
| issn | 2056-306X |
| language | English |
| last_indexed | 2024-12-13T12:31:46Z |
| publishDate | 2019-05-01 |
| publisher | BMC |
| record_format | Article |
| series | Zoological Letters |
| spelling | doaj.art-ce125834dff2424a9a733ee741b1700a2022-12-21T23:46:01ZengBMCZoological Letters2056-306X2019-05-015111310.1186/s40851-019-0131-5Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea)Andrea Luchetti0Giobbe Forni1Alyza M. Skaist2Sarah J. Wheelan3Barbara Mantovani4Department of Biological, Geological and Environmental Sciences, University of BolognaDepartment of Biological, Geological and Environmental Sciences, University of BolognaDepartment of Oncology, Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of MedicineDepartment of Oncology, Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of MedicineDepartment of Biological, Geological and Environmental Sciences, University of BolognaAbstract 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.http://link.springer.com/article/10.1186/s40851-019-0131-5BranchiopodaMitochondrial genomicsMitochondrial unequal recombinationNotostracaNucleotide compositional biasNucleotide substitution rate |
| spellingShingle | Andrea Luchetti Giobbe Forni Alyza M. Skaist Sarah J. Wheelan Barbara Mantovani Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea) Zoological Letters Branchiopoda Mitochondrial genomics Mitochondrial unequal recombination Notostraca Nucleotide compositional bias Nucleotide substitution rate |
| 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 | Branchiopoda Mitochondrial genomics Mitochondrial unequal recombination Notostraca Nucleotide compositional bias Nucleotide substitution rate |
| url | http://link.springer.com/article/10.1186/s40851-019-0131-5 |
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