Genomic Phylogenetics of Sturgeon Species

The field of genomic phylogenetics has transformed our understanding of sturgeon evolution and diversity. By integrating high‐throughput sequencing of mitochondrial and nuclear genomes, researchers have reconstructed evolutionary relationships among the 27 extant sturgeon species and their paddlefish relatives. Analyses of complete mitochondrial genomes have illuminated deep divergences dating back over 200 million years, while novel single‐copy nuclear markers have refined branching orders and provided more accurate estimates of speciation times. These insights reveal repeated episodes of anadromous and potamodromous migrations, underlying the global distribution of acipenserids, and uncover cryptic hybridisation events in wild and cultured populations. Together, genomic approaches are informing conservation management, enabling precise species identification, monitoring of genetic diversity and guidance for captive breeding programmes.

Research from Nature Portfolio

Recent studies have characterised complete mitochondrial genomes of three Central Asian shovelnose sturgeons, demonstrating clear genetic separation between the Amu Darya and Syr Darya lineages and confirming the monophyletic origin of this genus. Comparative analyses revealed minimal divergence between two sympatric Amu Darya species, suggesting potential hybridisation or intraspecific variation. These findings have prompted calls for revised taxonomic assessment and targeted conservation measures to protect critically endangered and possibly extinct species within this unique clade.

Genomic Phylogenetics of Sturgeon Species publication trend

The graph below shows the total number of articles in genomic phylogenetics of sturgeon species across all publications each year (not limited to Nature Index journals).

Technical terms

Mitochondrial genome: The circular DNA contained within mitochondria, inherited maternally and widely used for reconstructing evolutionary relationships.

Monophyletic: A group of organisms that includes an ancestral species and all its descendants, reflecting a single evolutionary lineage.

Nuclear protein-coding marker: A gene segment in nuclear DNA that encodes proteins and serves as a locus for comparative phylogenetic analysis.

Insertion/deletion (InDel) marker: A type of genetic variation characterised by the presence or absence of short DNA segments, useful for distinguishing species or lineages.

Molecular clock: A method that estimates the timing of evolutionary divergences based on the rate of genetic mutations over time.

References

1. Highly Resolved Phylogenetic Relationships within Order Acipenseriformes According to Novel Nuclear Markers. Genes (2019).
2. Molecular phylogeny of one extinct and two critically endangered Central Asian sturgeon species (genus Pseudoscaphirhynchus) based on their mitochondrial genomes. Scientific Reports (2020).
3. Modern Concepts on the Origin and Distribution of Acipenserids (Acipenseridae). Journal of Ichthyology (2023).
4. InDel DNA Markers Potentially Unique to Kaluga Sturgeon Huso dauricus Based on Whole-Genome Resequencing Data. Diversity (2023).