Scholarlink

<p>This study aims to clarify whether two circular mitochondrial structures and gene order are conserved within and among species of the genus <i>Brachionus</i>, and to identify potential peculiarities associated with the extensive ecological niches occupied by different species. We analyzed the complete mitochondrial genomes of 23 <i>Brachionus</i> strains from 11 species, including three freshwater species and eight species from the brackish-water <i>Brachionus plicatilis</i> species complex. Results showed that all <i>Brachionus</i> strains exhibited conserved two circular chromosome: mtDNA-I, containing four protein-coding genes (PCGs), 13 transfer RNAs (tRNAs), and two ribosomal RNAs (rRNAs); and mtDNA-II, containing eight PCGs and nine tRNAs. However, variation in gene arrangement was observed between species (e.g., <i>cytochrome c oxidase</i> rearrangement in freshwater <i>B. calyciflorus</i>) and strains within the <i>B. plicatilis</i> species complex (e.g., tRNA-L<sub>1</sub>, tRNA-L<sub>2</sub>, and tRNA-C rearrangements). Nucleotide diversity and nonsynonymous-to-synonymous substitution ratio analyses revealed higher sequence variability in <i>NADH dehydrogenase</i> genes (e.g., <i>nad2</i>, <i>nad4</i>, and <i>nad5</i>). These observations may reflect adaptive divergence of mitochondrial energy metabolism among <i>Brachionus</i> inhabiting different environments. Phylogenetic comparative models revealed that, similar to previous findings for the nuclear genome in the <i>B. plicatilis</i> species complex, mitochondrial genome size and features are correlated with organism body size across species.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Comparative mitogenomics of Brachionus rotifers reveals conserved bipartite mitochondrial architecture with lineage-specific divergence

  • 期刊论文

  • 发表日期：

    2026年7月14日

查看全文
  • Chengyan Han,
  • Min-Sub Kim,
  • Diego Fontaneto,
  • Zhou Yang,
  • Shuang Han,
  • Yoshitaka Sakakura,
  • Jae-Seong Lee,
  • Atsushi Hagiwara

摘要

This study aims to clarify whether two circular mitochondrial structures and gene order are conserved within and among species of the genus Brachionus, and to identify potential peculiarities associated with the extensive ecological niches occupied by different species. We analyzed the complete mitochondrial genomes of 23 Brachionus strains from 11 species, including three freshwater species and eight species from the brackish-water Brachionus plicatilis species complex. Results showed that all Brachionus strains exhibited conserved two circular chromosome: mtDNA-I, containing four protein-coding genes (PCGs), 13 transfer RNAs (tRNAs), and two ribosomal RNAs (rRNAs); and mtDNA-II, containing eight PCGs and nine tRNAs. However, variation in gene arrangement was observed between species (e.g., cytochrome c oxidase rearrangement in freshwater B. calyciflorus) and strains within the B. plicatilis species complex (e.g., tRNA-L1, tRNA-L2, and tRNA-C rearrangements). Nucleotide diversity and nonsynonymous-to-synonymous substitution ratio analyses revealed higher sequence variability in NADH dehydrogenase genes (e.g., nad2, nad4, and nad5). These observations may reflect adaptive divergence of mitochondrial energy metabolism among Brachionus inhabiting different environments. Phylogenetic comparative models revealed that, similar to previous findings for the nuclear genome in the B. plicatilis species complex, mitochondrial genome size and features are correlated with organism body size across species.