农业合成生物学驱动动物营养创新：进展与展望

doi:10.12211/2096-8280.2025-082

摘要/Abstract

摘要：

动物营养是保障畜牧业可持续发展的关键环节，其效率直接关系到资源利用效率、环境承载能力与粮食安全。随着农业合成生物技术的快速发展，研究者正积极应用工程化策略革新动物营养利用体系，主要涵盖饲料原料开发、饲料添加剂合成及胃肠道高效营养转化等方向。本文系统综述了该领域的最新进展，重点聚焦于基因编辑作物、微生物蛋白、饲料添加剂、胃肠道工程微生物等方向的关键使能技术与工程化策略，阐释了农业合成生物学在提升饲料利用效率、保障动物健康及促进畜牧业绿色转型中的巨大潜力。探讨了当前农业合成生物学在动物营养领域所面临的挑战与未来发展趋势，包括多基因系统设计与AI设计驱动生物育种进入4.0时代，动态调控系统开发与机器学习强化细胞工厂全局调控，多维度设计与学科交叉用于解析与调控动物消化系统。强调了其理念与技术对于突破现有技术瓶颈的关键作用。展望未来，农业合成生物学有望在动物营养领域扮演愈发重要的角色。

关键词: 农业合成生物技术, 动物营养, 蛋白饲料, 饲料添加剂, 微生物组工程

Abstract:

Animal nutrition stands as the cornerstone of sustainable animal husbandry development, with its overall efficiency directly influencing resource utilization efficiency, environmental carrying capacity, and global food security. Recent rapid advances in agricultural synthetic biology have enabled researchers to engineer animal nutrient utilization systems through innovative strategies, primarily encompassing feed ingredient optimization, synthetic feed additive production, and enhancement of gastrointestinal nutrient conversion efficiency. This review systematically examines recent progress in this field, focusing on the applicable of agricultural synthetic biology strategies for advancing animal nutrition. In the realm of feed ingredient quality improvement, gene editing technologies have significantly enhanced the nutritional value of key crops. For example, specific knockout of the GhPGF gene in cotton has achieved cottonseed detoxification, while targeted modifications to the sorghum kafirin gene family has improved protein digestibility and quality. To reduce reliance on soybean meal, multiple approaches have been developed to harness microbial protein resources, including overcoming production bottlenecks in methylotrophic yeast, precisely tuning carbon metabolism pathways in Clostridiumautoethanogenum, and developing cell wall disruption techniques for microalgae to enhance protein bioavailability. Synthetic biology approaches have also revolutionized feed additive production. Key strategies include metabolic pathway engineering to boost precursor supply, cofactor optimization to increase metabolic flux, gene editing to attenuate competing pathways, and protein engineering to improve the activity of rate-limiting enzymes. Furthermore, emerging synthetic biology tools show great promise for regulating gastrointestinal function. These include biotechnology-optoelectronic integration for advanced sensing systems, novel gene editing tools for precise modulation of gut microbiota, and intelligent synthetic microbial consortia for targeted regulation of the gastrointestinal microenvironment. Agricultural synthetic biology holds immense potential for enhancing feed conversion efficiency, safeguarding animal health, and driving the green transformation of animal husbandry. This review further discusses current challenges in the field, including technological bottlenecks and scalability issues, and outlines future development trends, emphasizing the critical role of synthetic biology in shaping next-generation animal nutrition systems.

Key words: agricultural synthetic biotechnology, animal nutrition, protein feed, feed additives, microbiome engineering

中图分类号:

李一塍, 罗会颖, 姚斌, 涂涛. 农业合成生物学驱动动物营养创新：进展与展望[J]. 合成生物学, DOI: 10.12211/2096-8280.2025-082.

LI Yicheng, LUO Huiying, YAO Bin, TU Tao. Agricultural Synthetic Biology Driving Innovation in Animal Nutrition： Advances and Prospects[J]. Synthetic Biology Journal, DOI: 10.12211/2096-8280.2025-082.

图/表 9

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微生物类型	菌种	底物	代谢途径	改造方法	产量/产率	产物	参考文献
甲基营养型酵母	P. pastoris	甲醇	氮代谢和细胞壁代谢	适应性实验室进化，过表达GDH1或GLN1	0.506 g/g DCW	单细胞蛋白	[25]
非天然甲基酵母	Y. lipolytica	甲醇	RuMP和XuMP途径	引入RuMP和XuMP途径基因，敲除内源甲醛脱氢酶	1.1 g/L/72h	单细胞蛋白	[26]
产乙酸菌	A. woodii	甲基、CO	氢气利用途径	双敲除氢化酶hydBA/hdcr	——	乳酸、单细胞蛋白	[27]
天然甲酸利用菌	P.communis	CO₂	——	偶联电催化CO₂还原模块与副球菌同化利用甲酸过程	2.6 g /L	单细胞蛋白	[28]
产乙酸菌	Acetobacterium	CO₂	Wood-Ljungdahl途径	集成产乙酸菌利用CO₂和产碱菌利用乙酸过程	1.5 g /L/d	单细胞蛋白	[29]
酵母	S. cerevisiae	玉米秸秆	——	表面展示CBP和PGP	3.23 g/L	单细胞蛋白	[30]
	R. toruloides	玉米秸秆	——	全过程设计预处理	蛋白208 g/kg 靛蓝素72 g/kg	单细胞蛋白、靛蓝素	[31]
	C. utilisACCC 20060	棉花秸秆	——	木糖利用微生物筛选	5.74 g/L	单细胞蛋白	[32]

微生物类型	菌种	底物	代谢途径	改造方法	产量/产率	产物	参考文献
甲基营养型酵母	P. pastoris	甲醇	氮代谢和细胞壁代谢	适应性实验室进化，过表达GDH1或GLN1	0.506 g/g DCW	单细胞蛋白	[25]
非天然甲基酵母	Y. lipolytica	甲醇	RuMP和XuMP途径	引入RuMP和XuMP途径基因，敲除内源甲醛脱氢酶	1.1 g/L/72h	单细胞蛋白	[26]
产乙酸菌	A. woodii	甲基、CO	氢气利用途径	双敲除氢化酶hydBA/hdcr	——	乳酸、单细胞蛋白	[27]
天然甲酸利用菌	P.communis	CO₂	——	偶联电催化CO₂还原模块与副球菌同化利用甲酸过程	2.6 g /L	单细胞蛋白	[28]
产乙酸菌	Acetobacterium	CO₂	Wood-Ljungdahl途径	集成产乙酸菌利用CO₂和产碱菌利用乙酸过程	1.5 g /L/d	单细胞蛋白	[29]
酵母	S. cerevisiae	玉米秸秆	——	表面展示CBP和PGP	3.23 g/L	单细胞蛋白	[30]
	R. toruloides	玉米秸秆	——	全过程设计预处理	蛋白208 g/kg 靛蓝素72 g/kg	单细胞蛋白、靛蓝素	[31]
	C. utilisACCC 20060	棉花秸秆	——	木糖利用微生物筛选	5.74 g/L	单细胞蛋白	[32]

维生素	种类	改造方法	产量	参考文献
25(OH)VD3	P450酶	嵌合型P450酶，全细胞催化	1.96 g/L	[45]
VA	S. cerevisiae	组合表达两种β合胡萝卜素裂解酶，引入视黄醇脱氢酶RDH12	5.21 g/L	[46]
α-Tocotrienol	S. cerevisiae	截短N端转运肽，解除限速步骤、增强前体供应，设计了冷休克触发温度控制系统	320 mg/L	[47]
VB6	E. coli	解耦生长途径与生产途径，上游模块强化前体供应，下游模块改造限速酶	1409 mg/L	[48]
VB5	E. coli	设计温度敏感开关动态调控细胞，精准分配碳通量，对关键酶进行理性改造	97.2 g/L	[49]

维生素	种类	改造方法	产量	参考文献
25(OH)VD3	P450酶	嵌合型P450酶，全细胞催化	1.96 g/L	[45]
VA	S. cerevisiae	组合表达两种β合胡萝卜素裂解酶，引入视黄醇脱氢酶RDH12	5.21 g/L	[46]
α-Tocotrienol	S. cerevisiae	截短N端转运肽，解除限速步骤、增强前体供应，设计了冷休克触发温度控制系统	320 mg/L	[47]
VB6	E. coli	解耦生长途径与生产途径，上游模块强化前体供应，下游模块改造限速酶	1409 mg/L	[48]
VB5	E. coli	设计温度敏感开关动态调控细胞，精准分配碳通量，对关键酶进行理性改造	97.2 g/L	[49]

氨基酸	菌株	改造策略	产量	参考文献
L-赖氨酸	C. glutamicum	代谢工程重定向碳通量，并利用动态启动子库调控NADPH供应	223.4 g/L	[54]
	C. glutamicum	关键酶改造、增加草酰乙酸和NADPH的供应及异源表达果糖激酶基因gmuE，提高生长速率	196.58 g/L	[55]
L-蛋氨酸	E. coli	增强琥珀酰辅酶A供应、引入直接硫磺酸化途径和削弱L-苏氨酸支链途径	20.39 g/L	[56]
L-色氨酸	E. coli	优化了抗反馈酶AroG、TrpE和SerA的组合;敲入yddG和prsL135I，敲除poxB基因	43.0 g/L	[57]
L-缬氨酸	C. necator	强化缬氨酸输出蛋白，敲除PHB合成途径，并筛选高效内源AHAS酶	972 mg/L	[58]
L-异亮氨酸	E. coli	使用柠檬酸途径替代苏氨酸途径，同时强化DcuD转运蛋白并重构非氧化糖酵解途径	56.6 g/L	[59]