Phylogenomics reveals the timescale of diversification in Amblycera

Systematic Entomology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 17, 2025

Abstract Recently, genomic approaches have helped to resolve phylogenetic questions in many groups of parasitic organisms, including lice (Phthiraptera). However, these still not been applied one the most diverse lice, Amblycera. To fill this gap, we phylogenomic methods based on genome‐level exon sequence data relationships within and among families Our trees support monophyly Ricinidae Laemobothriidae. Trimenoponidae Gyropidae are monophyletic, indicating that they should be merged into a single family. The placement Trinoton is unstable with respect Boopiidae Menoponidae, suggest recognizing Trinotonidae as separate At genus level, genera Colpocephalum , Hohorstiella Menacanthus Ricinus were recovered paraphyletic. Regarding generic complexes, tree revealed complex but paraphyletic, traditionally placed group. Dating analysis suggests divergence Amblycera occurred shortly after Cretaceous–Paleogene boundary 66 Mya. Cophylogenetic analyses host‐switching events during diversification Amblycera, evolutionary history does tightly mirror its hosts. Ancestral host reconstructions ancestral was likely bird, two switching mammals. By combining phylogenomics, molecular dating cophylogenetic analyses, provide first large‐scale picture amblyceran evolution, which will serve basis for future studies

Language: Английский

One Ring does not rule them all: Linear mtDNA in Metazoa

Gene, Journal Year: 2024, Volume and Issue: 933, P. 148999 - 148999

Published: Oct. 11, 2024

Recent advances in genome sequencing technologies have facilitated the exploration of architecture genomes, including mitochondrial genomes (mtDNA). In particular, whole has provided easier access to with unusual organizations, which were difficult obtain using traditional PCR-based approaches. As a consequence, there been steep increase complete mtDNA sequences, particularly for Metazoa. The popular view metazoan is that small gene-dense circular chromosome. This clashes discoveries number linear mtDNAs, non-bilaterian animals. Here, we review distribution Metazoa, namely isopods, cnidarians, and sponges. We discuss multiple origins mitogenomes these clades, where linearity linked likely insertion plasmid cnidarians demosponge Acanthella acuta, while fixation heteroplasmy anticodon site tRNA might be responsible monolinear form some isopods. also summarize our current knowledge mechanisms maintain integrity mitochromosomes, recurrent theme presence terminal repeats play role telomeres. caution defining chromosome as complete, when coding sequences key features DNA are missing. Finally, encourage authors interested mitogenome science utilize all available data mtDNA, those tagged "incomplete" or "unverified" public databases, they can still provide useful information such phylogenetic characters gene order.

Language: Английский

The mitochondrial genome of Bottapotamon fukienense (Brachiura: Potamidae) is fragmented into two chromosomes

BMC Genomics, Journal Year: 2024, Volume and Issue: 25(1)

Published: Aug. 2, 2024

China is the hotspot of global freshwater crab diversity, but their wild populations are facing severe pressures associated with anthropogenic factors, necessitating need to map taxonomic and genetic diversity design conservation policies. Herein, we sequenced mitochondrial genome a Chinese species Bottapotamon fukienense, found that it fragmented into two chromosomes. We confirmed fragmentation was not limited single specimen or population. Chromosome 1 comprised 15,111 base pairs (bp) there were 26 genes one pseudogene (pseudo-nad1) encoded on it. 2 8,173 bp 12 pseudogenes (pseudo-trnL2 pseudo-rrnL) Combined, they comprise largest mitogenome (23,284 bp) among Potamidae. only genus in Potamidae dataset exhibiting rearrangements protein-coding genes. fukienense exhibited average rates sequence evolution did differ selection from remaining This first experimentally crustaceans. While B. multiple signs elevated mitogenomic architecture rates, including exceptionally large size, duplicated genes, pseudogenisation, fragmentation, no evidence this matched by evolutionary changes pressures.

Language: Английский