摘要
Mitogenomes have been widely used in phylogenetic and taxonomic research,due to their maternal inheritance,accelerated evolutionary rates,compact circular structure,and the absence of introns.Although their utility is well-established,efficient mitogenome sequencing still poses a challenge for evolutionary studies.Here,we presented a novel hybridization capture protocol that enables high-fidelity sequencing of the complete mitogenome(16535 bp)of Odorrana nasuta.This genome exhibits typical anuran characteristics,including an A+T nucleotide bias(56.37%)and conserved gene composition.Notably,we identified a lineage-specific trnH transposition event that reorganizes the typical gene order into a unique trnH-trnL1-trnT-trnP-trnF cluster,which may be a potential synapomorphic trait for the genus Odorrana.Phylogenetic reconstruction using 13 protein-coding genes from 59 anuran species strongly supported the monophyly of Ranidae and its constituent genera(Odorrana,Rana,Lithobates,Amolops,Pelophylax,Glandirana),yet reveals the incongruence in the placement of Hylarana.The conflicting topologies observed for Hylarana and Glandirana across different studies highlight critical methodological limitations,including taxonomic sampling biases and data type dependency,which collectively compromise phylogenetic resolution.By integrating mitogenomic structure signatures with sequence-based phylogenies,this work advances our understanding of the systematics within Odorrana and highlights the need of multi-locus genomic datasets for resolving deep phylogenetic conflicts within Ranidae.
基金
the National Natural Science Foundation of China(NSFC)to Zhuo CHEN(Grant Nos.32270440 and 31601848)and Xiaohong CHEN(Grant No.U21A20192).
