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Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea).
Zoological Lett 2019; 5:15ZL

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.

Authors+Show Affiliations

1Department of Biological, Geological and Environmental Sciences, University of Bologna, via Selmi 3, 40126 Bolgna, Italy.1Department of Biological, Geological and Environmental Sciences, University of Bologna, via Selmi 3, 40126 Bolgna, Italy.2Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21205 USA.2Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21205 USA.1Department of Biological, Geological and Environmental Sciences, University of Bologna, via Selmi 3, 40126 Bolgna, Italy.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31149346

Citation

Luchetti, Andrea, et al. "Mitochondrial Genome Diversity and Evolution in Branchiopoda (Crustacea)." Zoological Letters, vol. 5, 2019, p. 15.
Luchetti A, Forni G, Skaist AM, et al. Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea). Zoological Lett. 2019;5:15.
Luchetti, A., Forni, G., Skaist, A. M., Wheelan, S. J., & Mantovani, B. (2019). Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea). Zoological Letters, 5, p. 15. doi:10.1186/s40851-019-0131-5.
Luchetti A, et al. Mitochondrial Genome Diversity and Evolution in Branchiopoda (Crustacea). Zoological Lett. 2019;5:15. PubMed PMID: 31149346.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mitochondrial genome diversity and evolution in Branchiopoda (Crustacea). AU - Luchetti,Andrea, AU - Forni,Giobbe, AU - Skaist,Alyza M, AU - Wheelan,Sarah J, AU - Mantovani,Barbara, Y1 - 2019/05/27/ PY - 2018/12/13/received PY - 2019/05/19/accepted PY - 2019/6/1/entrez PY - 2019/6/1/pubmed PY - 2019/6/1/medline KW - Branchiopoda KW - Mitochondrial genomics KW - Mitochondrial unequal recombination KW - Notostraca KW - Nucleotide compositional bias KW - Nucleotide substitution rate SP - 15 EP - 15 JF - Zoological letters JO - Zoological Lett VL - 5 N2 - 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. SN - 2056-306X UR - https://www.unboundmedicine.com/medline/citation/31149346/Mitochondrial_genome_diversity_and_evolution_in_Branchiopoda__Crustacea__ L2 - https://zoologicalletters.biomedcentral.com/articles/10.1186/s40851-019-0131-5 DB - PRIME DP - Unbound Medicine ER -