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<p>How gut symbionts contribute to host adaptation remains largely elusive. Studying co-diversified honeybees and gut bacteria across climates, we found cold-adapted species (<i>Apis mellifera</i>, <i>A. cerana</i>) exhibit enhanced genomic capacity for glucose, pyruvate, lipid and glucuronate production versus tropical species. Metagenomics revealed <i>Gilliamella</i> as the most enriched gut bacterium in cold-adapted bees. Germ-free honeybees inoculated with the <i>Gilliamella</i> from <i>A. cerana</i> showed increased activity, body temperature and fat storage upon cold exposure. Saccharide metabolomics demonstrated higher hindgut glucose levels in <i>Gilliamella-</i>colonized <i>A. mellifera</i> versus germ-free bees, and in <i>A. cerana</i> versus three sympatric tropical species. Although <i>Gilliamella</i> can hydrolyze β-glucan into glucose, cultural experiments suggest it preferentially degrades glucuronate to pyruvate. In turn, monocolonized bees upregulated hindgut glucose/pyruvate utilization while increasing glucuronate provision, suggesting nutritional complementarity. <i>Gilliamella</i>’s transporter genes predominantly target ascorbate (a glucuronate derivative), which is elevated in inoculated hindguts. Accordingly, <i>Gilliamella</i> converts ascorbate to D-xylulose-5P (promoting lipogenesis), while showing reduced growth on glucuronate/ascorbate versus glucose, potentially minimizing glucose competition with hosts. We revealed a highly coordinated host-symbiont metabolic synergy enhancing host energy acquisition for cold adaptation.</p>

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Honeybee-Gilliamella synergy in carbohydrate metabolism enhances host thermogenesis in cold acclimation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月25日

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  • Min Tang,
  • Chenyi Li,
  • Xinwei Ge,
  • Yu Kuang,
  • Lifei Qiu,
  • Kevin Chun Chan,
  • Zhiwei Chen,
  • Lizhen Guo,
  • Zhunan Zhao,
  • Bingxin Zhang,
  • Shanlin Liu,
  • Xin Zhou

摘要

How gut symbionts contribute to host adaptation remains largely elusive. Studying co-diversified honeybees and gut bacteria across climates, we found cold-adapted species (Apis mellifera, A. cerana) exhibit enhanced genomic capacity for glucose, pyruvate, lipid and glucuronate production versus tropical species. Metagenomics revealed Gilliamella as the most enriched gut bacterium in cold-adapted bees. Germ-free honeybees inoculated with the Gilliamella from A. cerana showed increased activity, body temperature and fat storage upon cold exposure. Saccharide metabolomics demonstrated higher hindgut glucose levels in Gilliamella-colonized A. mellifera versus germ-free bees, and in A. cerana versus three sympatric tropical species. Although Gilliamella can hydrolyze β-glucan into glucose, cultural experiments suggest it preferentially degrades glucuronate to pyruvate. In turn, monocolonized bees upregulated hindgut glucose/pyruvate utilization while increasing glucuronate provision, suggesting nutritional complementarity. Gilliamella’s transporter genes predominantly target ascorbate (a glucuronate derivative), which is elevated in inoculated hindguts. Accordingly, Gilliamella converts ascorbate to D-xylulose-5P (promoting lipogenesis), while showing reduced growth on glucuronate/ascorbate versus glucose, potentially minimizing glucose competition with hosts. We revealed a highly coordinated host-symbiont metabolic synergy enhancing host energy acquisition for cold adaptation.