Molecular Phylogenetics of Crustacean Mitochondrial Genomes

The mitochondrial genome has become a cornerstone for resolving evolutionary relationships among crustaceans, offering a compact, conserved set of 37 genes and a control region whose sequence and gene order can vary among lineages. Advances in high-throughput sequencing and bioinformatic pipelines now allow rapid recovery and assembly of complete mitogenomes across diverse taxa, from lobsters and crabs to shrimps and crayfishes. Comparative analyses of gene content, arrangement and nucleotide composition provide multilayered phylogenetic signal: nucleotide and amino-acid sequences support branching order within infraorders, while gene-order rearrangements and compositional biases (strand asymmetry, codon usage) serve as independent markers of clade membership. Integrating divergence-time estimation and fossil calibrations has yielded robust timelines for major splits, illuminating crustacean diversification through the Palaeozoic and Mesozoic. This body of work underpins practical applications ranging from accurate species identification and population connectivity in fisheries management to insights into convergent terrestrialisation in crabs and adaptive radiations in freshwater lineages.

Research from Nature Portfolio

Recent studies have uncovered exceptional mitochondrial gene-order diversity among brachyuran crabs, revealing that the ancestral Brachyura arrangement (BraGO) persists as a plesiomorphic block from which all observed variants derive. Detailed mapping in spider crabs demonstrated unique β-strand gene blocks and transformational pathways that track evolutionary splits within Majidae. Broader comparative mitogenomic surveys across Decapoda have collated over 200 complete mitogenomes, exposing uneven distribution of rearrangements among infraorders and identifying specific gene orders as synapomorphic signatures for particular clades. These analyses also highlighted clade-specific trends in nucleotide composition, strand asymmetry and codon usage, though no simple correlations with ecological niche were found. In a complementary vein, the first mitogenome of the Caribbean spiny lobster established that protein-coding genes remain under purifying selection, that gene order conforms to the Pancrustacean ground pattern, and that concatenated mitochondrial loci robustly recover infraorder monophyly and support meta-population connectivity studies.

Molecular Phylogenetics of Crustacean Mitochondrial Genomes publication trend

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

Technical terms

Mitochondrial genome: The circular DNA molecule in mitochondria encoding 13 protein-coding genes, 22 tRNAs and two rRNAs, widely used for phylogenetic inference.

Gene order rearrangement: A change in the linear arrangement of mitochondrial genes, informative as a rare genomic character in evolutionary reconstructions.

Strand asymmetry: The unequal distribution of nucleotides (A, T, G, C) between the heavy and light strands of mitochondrial DNA, reflecting replication and transcription biases.

Anchored hybrid enrichment: A targeted sequencing method using conserved probe sets to capture hundreds of genomic loci for phylogenomic analyses across divergent taxa.

Synapomorphy: A shared derived character state that defines a monophyletic group and distinguishes it from other lineages.

References

1. Convergent Adaptation of True Crabs (Decapoda: Brachyura) to a Gradient of Terrestrial Environments. Systematic Biology (2023).
2. The highly rearranged mitochondrial genomes of the crabs Maja crispata and Maja squinado (Majidae) and gene order evolution in Brachyura. Scientific Reports (2017).
3. Comparative mitogenomics of the Decapoda reveals evolutionary heterogeneity in architecture and composition. Scientific Reports (2019).
4. The complete mitochondrial genome of the Caribbean spiny lobster Panulirus argus. Scientific Reports (2018).
5. A phylogenomic framework, evolutionary timeline and genomic resources for comparative studies of decapod crustaceans. Proceedings of the Royal Society B (2019).
6. The complete mitochondrial genome of Sesarmops sinensis reveals gene rearrangements and phylogenetic relationships in Brachyura. PLOS ONE (2017).
7. Digging deeper: new gene order rearrangements and distinct patterns of codons usage in mitochondrial genomes among shrimps from the Axiidea, Gebiidea and Caridea (Crustacea: Decapoda). PeerJ (2017).
8. Integrated shotgun sequencing and bioinformatics pipeline allows ultra-fast mitogenome recovery and confirms substantial gene rearrangements in Australian freshwater crayfishes. BMC Ecology and Evolution (2014).