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<p>An obligate anaerobic, Gram-negative rod-shaped bacterial strain designated AD58<sup>T</sup> was isolated from the feces of a 3-year-old boy with atopic dermatitis. The closest species is <i>Parabacteroides fecalis</i> with 96.98% 16S rRNA gene identity. The average nucleotide identity value between AD58<sup>T</sup> and <i>P. fecalis</i> AGMB00274<sup>T</sup> is 85.0–85.4%. The circular genome sequence is 3.77 Mbp long with 43.5 mol% G + C content. The strain AD58<sup>T</sup> grows at 32–42&#xa0;°C, its pH range for growth is 6.0–7.5. No growth is observed in the presence of 1% or higher NaCl concentrations. The major fatty acids are anteiso-C15: 0, iso-C15: 0, and summed feature 11 (iso-C17: 0 3–OH and/or C18: 2 DMA), and the predominant respiratory quinone is MK-9. Conditioned media from AD58<sup>T</sup> increased expression of IL-8 but decreased expression of TLR-4 in HT29 cells. Based on the described properties, we propose AD58<sup>T</sup> as the type strain of <i>Parabacteroides absconsus</i> sp. nov. (= VKM B-3630<sup>T</sup> = JCM 35468<sup>T</sup>).</p>

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Parabacteroides absconsus sp. nov., isolated from feces of a child with atopic dermatitis

  • 期刊论文

  • 发表日期：

    2025年1月5日

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  • Andrei V. Chaplin,
  • Alla P. Pikina,
  • Victoria A. Shcherbakova,
  • Sofia R. Sokolova,
  • Irina V. Podoprigora,
  • Milana S. Das,
  • Filipp A. Koshkin,
  • Galit A. Ilyina,
  • Iuliia A. Vasiliadis,
  • Boris A. Efimov

摘要

An obligate anaerobic, Gram-negative rod-shaped bacterial strain designated AD58T was isolated from the feces of a 3-year-old boy with atopic dermatitis. The closest species is Parabacteroides fecalis with 96.98% 16S rRNA gene identity. The average nucleotide identity value between AD58T and P. fecalis AGMB00274T is 85.0–85.4%. The circular genome sequence is 3.77 Mbp long with 43.5 mol% G + C content. The strain AD58T grows at 32–42 °C, its pH range for growth is 6.0–7.5. No growth is observed in the presence of 1% or higher NaCl concentrations. The major fatty acids are anteiso-C15: 0, iso-C15: 0, and summed feature 11 (iso-C17: 0 3–OH and/or C18: 2 DMA), and the predominant respiratory quinone is MK-9. Conditioned media from AD58T increased expression of IL-8 but decreased expression of TLR-4 in HT29 cells. Based on the described properties, we propose AD58T as the type strain of Parabacteroides absconsus sp. nov. (= VKM B-3630T = JCM 35468T).