细菌原本用来防御病毒的 CRISPR 系统，是怎样变成基因编辑工具的？
How was the bacterial antiviral CRISPR system turned into a gene-editing tool?
细菌用 CRISPR 阵列记录病毒序列，并由 Cas9 蛋白切开入侵 DNA；科学家改用向导 RNA 引导 Cas9 精准切断任意目标基因，借用了这套免疫机制。
Bacteria record viral sequences in CRISPR arrays and use Cas9 to cut invading DNA; scientists hijack this by using a guide RNA to direct Cas9 to cut any chosen gene.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#CRISPR #基因编辑 #细菌免疫
人工合成的最小细菌基因组JCVI-syn3.0是怎样被“写”出来的？为什么它保留了上百个功能未知的基因？
How was the synthetic minimal bacterial genome JCVI-syn3.0 'written,' and why does it retain over a hundred genes of unknown function?
团队以蕈状支原体为起点，先经全基因组转座子诱变筛出必需基因，再化学合成并组装缩减版基因组，多轮“设计—构建—测试”迭代后获得仅约53万碱基对、473个基因的JCVI-syn3.0。其中149个基因虽功能未知却不可删除，因为删除会使细胞停止增殖——生命核心网络仍藏未注释的关键组件；该最小底盘也为按需加装新功能提供了平台。
Starting from Mycoplasma mycoides, the team first used whole-genome transposon mutagenesis to classify every gene as essential or dispensable for growth, then chemically synthesized and assembled progressively reduced genomes through iterative design-build-test cycles, arriving at JCVI-syn3.0 with about 531 kilobase pairs and only 473 genes. One hundred forty-nine genes stayed despite unknown functions because removing any halted cell proliferation—evidence that life's core network still hides unannotated essential components—and this stripped-down chassis became a platform for installing custom functions on demand.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Hutchison C.A. III 等《Design and synthesis of a minimal bacterial genome》,Science,2016年第351卷文章号aad6253,DOI:10.1126/science.aad6253
Hutchison C.A. III et al., "Design and synthesis of a minimal bacterial genome," Science 351:aad6253 (2016), doi:10.1126/science.aad6253
独立核验依据 · Independent verification: 核验依据 1 EUROPEPMC 标识 27013737：Design and synthesis of a minimal
#最小基因组 #基因组合成 #底盘细胞
最小合成基因组（如 JCVI-syn3.0）说明了什么？
What does a minimal synthetic genome such as JCVI-syn3.0 tell us?
科学家把支原体的基因组精简到约 473 个基因，造出能自我复制的最小细胞，从而界定了维持自由生命所需的必需基因底线。
Researchers trimmed a mycoplasma genome to about 473 genes to build the smallest self-replicating cell, defining the minimal gene set needed for free-living life.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#最小基因组 #合成生命
什么是细胞工厂？
What is a cell factory?
通过改写微生物的代谢通路，让大肠杆菌或酵母大量合成青蒿素前体、胰岛素或香料等产物，这种工程化培养系统就称为细胞工厂。
By rewiring a microbe's metabolism, engineered E. coli or yeast mass-produce compounds like artemisinin precursors or insulin, a system called a cell factory.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#细胞工厂 #代谢工程
什么是生物砖（Biobrick）和标准化的 DNA 部件？
What are Biobricks and standardized DNA parts?
生物砖是把启动子、核糖体结合位点等做成接口统一、可像电子元件一样拼装的 DNA 片段，让基因线路的设计和构建变得模块化。
Biobricks are DNA pieces with standardized interfaces, such as promoters and ribosome sites, that snap together like electronic components to modularize genetic-circuit design.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#生物砖 #标准化部件
人工设计的基因回路（如振荡器、开关）能做什么？
What can engineered genetic circuits such as oscillators or switches do?
合成基因回路可让细胞按设计节律发光，或在信号出现时切换状态，被用来做智能药物递送、环境污染物检测和生物计算。
Engineered circuits make cells blink on a rhythm or flip states when signals appear, enabling smart drug delivery, pollutant sensing, and biological computing.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#基因回路 #生物振荡器
什么是合成生物学？
What is synthetic biology?
合成生物学像搭积木一样，把让细胞执行新任务的基因和调控元件组合在一起，让细菌或酵母变成生产药物、燃料或材料的微型工厂。
Synthetic biology snaps together genes and control elements so cells perform new tasks, turning bacteria or yeast into tiny factories for drugs, fuels, or materials.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#合成生物学 #基因线路