Mitochondrial Genomics and Phylogenetic Analysis in Vertebrates

Mitochondrial genomes offer a compact and rapidly evolving genetic system widely employed to reconstruct evolutionary histories across vertebrate lineages. Typically comprising 13 protein‐coding genes, two rRNAs, 22 tRNAs and a non‐coding control region, the mitogenome’s maternal inheritance and high substitution rates facilitate both deep and shallow phylogenetic inference. Recent advances in sequencing platforms, from long‐read technologies to hybrid assembly pipelines, have improved the completeness and accuracy of mitogenome assemblies, revealing previously hidden features such as tandem repeats, gene duplications and structural rearrangements. Such architectural novelties shed light on mechanisms of mitochondrial evolution, including concerted evolution of duplicated regions and the impact of replication fork barriers. Parallel to technological progress, an expanding body of curated databases for key markers, such as cytochrome b, has enhanced data quality and taxonomic breadth, enabling robust comparative analyses. Phylogenetic frameworks derived from mitogenomic datasets have clarified the timing of major vertebrate radiations and resolved contentious relationships within groups from amphibians to birds. However, critical challenges remain, notably the detection of nuclear mitochondrial sequences (NUMTs), sequencing artefacts and misidentifications in public repositories, which can compromise phylogenetic reliability. Addressing these issues through stringent quality control measures and integrative approaches that combine mitochondrial with nuclear data promises to refine our understanding of vertebrate evolution and inform conservation strategies in the face of biodiversity loss.

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Mitochondrial Genomics and Phylogenetic Analysis in Vertebrates publication trend

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

Technical terms

Mitochondrial genome (mitogenome): The circular DNA within mitochondria encoding proteins, rRNAs and tRNAs essential for oxidative phosphorylation.

Control region: The major non‐coding segment of the mitogenome containing origins of replication and transcription, often highly variable.

Cytochrome b (cyt-b): A mitochondrial protein‐coding gene commonly used as a phylogenetic marker at species and genus levels.

Gene duplication: The presence of two or more copies of a genomic region arising from replication events, contributing to structural variation.

NUMTs: Nuclear mitochondrial DNA segments inserted into the nuclear genome, which can confound mitochondrial sequence analyses if unrecognised.

References

1. Complete vertebrate mitogenomes reveal widespread repeats and gene duplications. Genome Biology (2021).
2. ACDC, a global database of amphibian cytochrome-b sequences using reproducible curation for GenBank records. Scientific Data (2020).
3. Sharp Increase of Problematic Mitogenomes of Birds: Causes, Consequences, and Remedies. Genome Biology and Evolution (2021).