利基专业化和交叉食相互作用塑造肠道微生物纤维降解在一个模型的食肉动物
bioRxiv : the preprint server for biology
|February 6, 2026
概括
的肠道微生物有效地分解植物纤维,如西兰和纤维素. 不同的微生物专注于降解特定的多糖,揭示了模拟无食动物中复杂的纤维代谢.
科学领域:
- 微生物生态学 微生物生态学
- 生物化学 生物化学
背景情况:
- 肠道微生物群对宿主健康至关重要,产生影响消化和免疫力的代谢物.
- 肠道微生物的食纤维发酵产生有益的副产品,影响肠道稳定性和宿主福祉.
- 在复杂的肠道社区中了解微生物特异性的多糖代谢是具有挑战性的.
研究的目的:
- 为了研究美国的复杂肠道微生物群落如何对西兰和纤维素做出反应.
- 通过使用定义的饮食来确定微生物对多糖分解的特定贡献.
- 探索纤维成分对肠道微生物群活动和基因表达的影响.
主要方法:
- 使用美国 (Periplaneta americana) 作为一个模型的食肉动物.
- 管理含有西兰,纤维素或两者的混合物的化学定义合成食.
- 采用16S rRNA基因分析和RNA-sequencing (RNA-seq) 进行社区和活动分析.
- 应用以生物为中心的泛基因组方法来评估微生物基因功能.
主要成果:
- 混合纤维丰富了特定的微生物种类和新生物体,这些新生物体在单纤维饮食中没有发现.
- 克西兰强烈刺激了Bacteroidota.com的克西兰活性碳水化合物活性酶 (CAZyme) 生产.
- 巴西洛塔对西兰作为二次降解剂作出反应,而Fibrobacterota是主要的纤维素降解剂.
- 纤维素饮食增加了Fibrobacterota的转录活性,这是关键的纤维素和纤维素降解剂.
结论:
- 肠道微生物群落对不同的植物多糖化物 (xylan和纤维素) 呈现出不同的反应.
- 特定的细菌类和属是降解复杂植物纤维的关键参与者.
- 美国模型和合成饮食是研究肠道微生物多糖代谢的有效工具.
相关概念视频
Ecological Niches
26.7K
All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
26.7K
Crossing Over
172.1K
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
172.1K
Regulated Protein Degradation
8.9K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
8.9K
Dihybrid Crosses
81.3K
Overview
81.3K
Proteins: From Genes to Degradation
14.5K
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA...
Transcription is the synthesis of RNA...
14.5K
Molecular Shape and Polarity
75.8K
Dipole Moment of a Molecule
75.8K


