Mitochondrial Genomics and Phylogenetics of Isopoda

Isopods display extraordinary mitochondrial genome diversity that has informed both genome architecture studies and phylogenetic reconstructions. Mitogenomes of this crustacean order typically contain 13 protein-coding genes, two ribosomal RNAs and a suite of transfer RNAs, but deviate widely in gene order, noncoding control-region structure and strand-specific nucleotide skews. Frequent gene rearrangements, including translocations and inversions of tRNA genes, underscore a destabilised mitogenomic architecture that often correlates with life-history traits such as parasitism or adaptation to deep-sea environments. Comparative analyses have revealed inversion of replication origins and double-inverted strand asymmetries that drive compositional heterogeneity and can mislead phylogenetic inference through long-branch attraction. Integrative approaches combining complete mitogenome sequences with structural RNA information have improved alignment accuracy and refined isopod relationships, challenging traditional subordinal classifications and exposing paraphyly in groups such as Cymothoida. Advancements in high-throughput sequencing and annotation platforms, coupled with voucher-linked specimens, are poised to resolve outstanding questions in isopod evolution, biogeography and the molecular basis of ecological specialisations.

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Mitochondrial Genomics and Phylogenetics of Isopoda publication trend

The graph below shows the total number of articles in mitochondrial genomics and phylogenetics of isopoda across all publications each year (not limited to Nature Index journals).

Technical terms

Mitogenome: The complete mitochondrial DNA sequence of an organism, including protein-coding genes, rRNAs, tRNAs and control regions.

Gene order: The arrangement of genes on the mitochondrial genome, whose rearrangements can inform evolutionary relationships.

Replication origin inversion (ROI): A reversal of the initiation site for mitochondrial DNA replication, leading to altered strand-specific nucleotide composition.

Strand asymmetry (nucleotide skew): A bias in the frequency of nucleotides (e.g. GC skew) between the two strands of the mitochondrial genome.

Long-branch attraction: A phylogenetic artefact in which rapidly evolving lineages appear falsely related due to convergent sequence changes.

Heteroplasmy: The presence of multiple mitochondrial DNA variants within a single organism or cell, often influencing tRNA function.

Control region: A noncoding mitochondrial segment that regulates replication and transcription, often rich in repeats and variable in size.

References

1. Web Apollo: a web-based genomic annotation editing platform. Genome Biology (2013).
2. Science Forum: The critical importance of vouchers in genomics. eLife (2021).
3. The first complete mitogenome of the South China deep‐sea giant isopod Bathynomus sp. (Crustacea: Isopoda: Cirolanidae) allows insights into the early mitogenomic evolution of isopods. Ecology and Evolution (2017).
4. Basal position of two new complete mitochondrial genomes of parasitic Cymothoida (Crustacea: Isopoda) challenges the monophyly of the suborder and phylogeny of the entire order. Parasites & Vectors (2018).
5. Architectural instability, inverted skews and mitochondrial phylogenomics of Isopoda: outgroup choice affects the long-branch attraction artefacts. Royal Society Open Science (2020).
6. Improved accuracy of multiple ncRNA alignment by incorporating structural information into a MAFFT-based framework. BMC Bioinformatics (2008).