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<p>Genome sequences have become indispensable for objective and reliable bacterial taxonomy. The genus <i>Pseudaestuariivita</i> is a member of the family <i>Roseobacteraceae</i>. In this study, genome sequence analysis was employed to re-evaluate the taxonomic status of the species <i>Pseudaestuariivita rosea</i>. Genome-based phylogenetic analysis revealed that <i>Pseudaestuariivita</i> species are polyphyletic. Specifically, the species <i>Pseudaestuariivita rosea</i> clustered phylogenetically with the type species of the genus <i>Parasulfitobacter</i>, <i>Parasulfitobacter algicola</i>, rather than with the type species of the genus <i>Pseudaestuariivita</i>, <i>Pseudaestuariivita atlantica</i>. Comparative analyses of average amino acid identity (AAI), percentage of conserved proteins (POCP), genome-wide average nucleotide identity (gANI), alignment fraction (AF), and phenotypic traits revealed a significantly higher degree of similarity between the species <i>Pseudaestuariivita rosea</i> and <i>Parasulfitobacter algicola</i> than between the species <i>Pseudaestuariivita rosea</i> and <i>Pseudaestuariivita atlantica</i>. The integrated evidence from genomic and phenotypic characterization leads to a formal proposal for the reclassification of the species <i>Pseudaestuariivita rosea</i> as <i>Parasulfitobacter roseus</i> comb. nov. This reclassification resolves the taxonomic ambiguity surrounding the species <i>Pseudaestuariivita rosea</i>, resulting in a more consistent classification within the family <i>Roseobacteraceae</i>.</p>

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Genome Sequence Analysis Reveals Polyphyly in the Genus Pseudaestuariivita and Supports Reclassification of the Species Pseudaestuariivita rosea as Parasulfitobacter roseus comb.nov

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Mengdan He,
  • Xiaokun Xu,
  • Qingjie Xue,
  • Ang Liu

摘要

Genome sequences have become indispensable for objective and reliable bacterial taxonomy. The genus Pseudaestuariivita is a member of the family Roseobacteraceae. In this study, genome sequence analysis was employed to re-evaluate the taxonomic status of the species Pseudaestuariivita rosea. Genome-based phylogenetic analysis revealed that Pseudaestuariivita species are polyphyletic. Specifically, the species Pseudaestuariivita rosea clustered phylogenetically with the type species of the genus Parasulfitobacter, Parasulfitobacter algicola, rather than with the type species of the genus Pseudaestuariivita, Pseudaestuariivita atlantica. Comparative analyses of average amino acid identity (AAI), percentage of conserved proteins (POCP), genome-wide average nucleotide identity (gANI), alignment fraction (AF), and phenotypic traits revealed a significantly higher degree of similarity between the species Pseudaestuariivita rosea and Parasulfitobacter algicola than between the species Pseudaestuariivita rosea and Pseudaestuariivita atlantica. The integrated evidence from genomic and phenotypic characterization leads to a formal proposal for the reclassification of the species Pseudaestuariivita rosea as Parasulfitobacter roseus comb. nov. This reclassification resolves the taxonomic ambiguity surrounding the species Pseudaestuariivita rosea, resulting in a more consistent classification within the family Roseobacteraceae.