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南京农大毛胜勇团队:靶向瘤胃菌群,或可提升牛奶"好"脂肪含量|热心肠日报

  • 2026-04-20 12:24:56
南京农大毛胜勇团队:靶向瘤胃菌群,或可提升牛奶"好"脂肪含量|热心肠日报
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本文要点

IF: 12.7
Integrated metatranscriptomics identifies Lachnospiraceae as keystone taxa regulating rumen biohydrogenation and milk ω-6/ω-3 polyunsaturated fatty acids ratio in dairy cows
Han Zhang
Weimin MaoZheng LaiYipeng ZhuJiahao DongLu LiFei Xie朱伟云Junshi Shen
毛胜勇
Article|2026-04-13|OA
10.1186/s40168-026-02397-7

背景与设计

针对牛奶ω-6/ω-3多不饱和脂肪酸(PUFA)比例欠佳的问题,利用多组学技术及体外分离培养,解析95头荷斯坦奶牛瘤胃菌群的脂质代谢调控网络。

核心发现与意义

毛螺菌科主导的底物特异性生物氢化过程,驱动了牛奶ω-6/ω-3 PUFA比例变异,为靶向菌群改善乳品营养价值提供了干预策略。

表型关联

多组学关联分析证实,瘤胃细菌群落结构解释了41.0%的牛奶ω-6/ω-3比例变异,且高低比例组间α-亚麻酸与亚油酸的代谢通量存在显著差异。

关键活性类群

宏转录组数据显示,高比例组显著富集双歧杆菌异构酶等基因转录本,且该类基因主要由毛螺菌科的丁酸弧菌属和真杆菌属编码。

代谢机制

体外纯培养实验证实,B. hungatei优先氢化α-亚麻酸,而Eubacterium_I特异性代谢亚油酸,提示不同菌株对PUFA底物的差异化降解决定了乳脂表型。

核心关键词

瘤胃菌群奶牛牛奶多不饱和脂肪酸ω-3脂肪酸ω-6脂肪酸毛螺菌科真杆菌属丁酸弧菌属宏转录组学菌群代谢脂质代谢

科普解读

牛奶是日常饮食的重要组成,但其脂肪中的ω-6与ω-3多不饱和脂肪酸(PUFA)的比例长期失衡,常高达约10:1,远高于世界卫生组织推荐的均衡摄入比例。这种失衡与多种心血管及代谢疾病风险上升相关。过往改善策略多聚焦于饲料调整,但即便在统一饲喂条件下,不同奶牛个体产出的牛奶脂肪比例依然差异巨大,暗示了个体内源性因素的强力调控

近期,一项发表在Microbiome期刊、由毛胜勇团队主导的研究,揭示了瘤胃微生物是这一差异背后的关键“操纵者”。

数据中的关键线索

研究团队对95头处于泌乳中期的荷斯坦奶牛进行了多组学分析。这些奶牛的牛奶ω-6/ω-3 PUFA比例表现出惊人的个体差异,从2.87到15.16不等,均值为7.18。通过构建线性混合模型,团队量化了瘤胃微生物群对表型的贡献度。结果表明,瘤胃细菌群落结构能解释高达41%的比例差异,这一贡献度显著高于此前关于甲烷排放或乳蛋白产量的类似估算,凸显了微生物在调控乳脂组成中的核心地位。

为了深入探索机制,研究者筛选出表型极端的两组奶牛:高比例组(HFR)和低比例组(LFR)。关键发现是,尽管两组奶牛采食相同饲料且养分表观消化率无异,但它们瘤胃、血液和牛奶中的脂肪酸谱却显著不同。特别是α-亚麻酸(ALA,ω-3前体)和亚油酸(LA,ω-6前体),这两种膳食中主要的PUFA,在两组奶牛的多个生理隔室中均呈现系统性差异。

微生物群落的结构与功能分化

通过16S rRNA基因测序和宏转录组学,研究发现HFR与LFR奶牛的瘤胃微生物群落结构存在显著差异。HFR组拥有更高的细菌Shannon多样性。在属水平上,多个菌属的丰度呈现组间特异性变化。

更重要的是,基于转录活性的功能分析揭示了决定性差异。研究发现,在HFR组中,与多不饱和脂肪酸生物氢化相关的异构酶基因(如双歧杆菌异构酶BBI)转录水平显著更高。生物氢化是瘤胃微生物将饲料中的不饱和脂肪酸逐步饱和的过程,它直接减少了流向小肠的ω-3 PUFA,从而影响最终进入牛奶的脂肪酸组成。

宏转录组数据将这些活跃的异构酶基因主要溯源至毛螺菌科微生物,尤其是丁酸弧菌属和优杆菌属的成员。进一步的相关性分析显示,瘤胃中的ALA含量与某些优杆菌属成员呈正相关,而LA含量则与丁酸弧菌属成员正相关,暗示了不同的微生物类群可能偏好代谢不同的脂肪酸底物

从关联到机制的验证

为验证上述关联,研究团队成功从瘤胃液中分离出代表性菌株:B. hungatei LGM 122(属于丁酸弧菌属)和Eubacterium_I LGM 112。体外培养实验提供了直接证据:LGM 122菌株表现出强烈的ALA代谢能力,能将其转化为LA、油酸等;而LGM 112菌株则专一且高效地代谢LA,但对ALA几乎无作用。

这两种菌株的全基因组比较分析也揭示了它们不同的功能倾向。LGM 122拥有更丰富的碳水化合物活性酶,可能在提供还原力方面更具优势;而LGM 112则在营养转运和吸收相关通路上更为突出。这些基因组特征的差异,支持了它们在瘤胃复杂生态中扮演互补的代谢角色

构建调控网络与未来展望

综合所有数据,研究提出了一个概念模型:在HFR奶牛中,活跃的丁酸弧菌属等微生物,伴随着较高的BBI异构酶活性,可能促进了LA及其特定中间产物的积累,最终导向较高的牛奶ω-6/ω-3比例。而在LFR奶牛中,以Eubacterium_I为代表的微生物活动模式,可能导致ALA的代谢流向发生改变,保留更多ω-3 PUFA,从而产生比例更低的牛奶。

这项研究不仅明确了瘤胃微生物,特别是毛螺菌科,是调控牛奶关键营养指标的重要变量,还通过多组学整合与分离验证,为理解其作用机制提供了框架。团队指出,微生物的贡献与宿主遗传等因素共同作用,塑造了最终的乳脂组成。未来,通过精准调控瘤胃内这些关键功能微生物的组成与活性,有望成为开发高营养价值乳制品、满足人类健康需求的新策略。

图片摘要

图片由AI生成,可能有错,请谨慎辨别。

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  1. CONNECT:[ UseTime:0.000353s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000563s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000287s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000293s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000623s ]
  6. SELECT * FROM `set` [ RunTime:0.003181s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000741s ]
  8. SELECT * FROM `article` WHERE `id` = 533987 LIMIT 1 [ RunTime:0.000498s ]
  9. UPDATE `article` SET `lasttime` = 1776734164 WHERE `id` = 533987 [ RunTime:0.003592s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000689s ]
  11. SELECT * FROM `article` WHERE `id` < 533987 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007999s ]
  12. SELECT * FROM `article` WHERE `id` > 533987 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000544s ]
  13. SELECT * FROM `article` WHERE `id` < 533987 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010130s ]
  14. SELECT * FROM `article` WHERE `id` < 533987 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002524s ]
  15. SELECT * FROM `article` WHERE `id` < 533987 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001422s ]
0.102815s