CRISPR-Cas9 技术如何实现对基因的精确编辑？
How does CRISPR-Cas9 technology enable precise gene editing?
CRISPR-Cas9 利用一段引导 RNA（gRNA）识别目标 DNA 序列，并引导 Cas9 酶在该位置切割双链 DNA，使科学家能够敲除或替换特定基因。该技术源自细菌对抗病毒的免疫机制，2012 年由 Doudna 和 Charpentier 团队阐明，二人因此获得 2020 年诺贝尔化学奖。
CRISPR-Cas9 uses a guide RNA to recognize a target DNA sequence and directs the Cas9 enzyme to cut the DNA there, allowing scientists to knock out or replace specific genes. Derived from a bacterial antiviral immune mechanism, it was elucidated in 2012 by Doudna and Charpentier, who won the 2020 Nobel Prize in Chemistry.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
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出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
《科学》（Science）期刊 2012 年 Doudna & Charpentier 论文；2020 年诺贝尔化学奖官方公告
Science (2012), Doudna & Charpentier; Nobel Prize in Chemistry 2020 announcement
#CRISPR #基因编辑 #Cas9
PCR 怎样把微量的 DNA 放大上百万倍？
How does PCR amplify a trace of DNA millions of times?
聚合酶链式反应用一对引物界定目标片段，在变性、退火、延伸三个温度间循环，使 DNA 聚合酶每次把模板复制一倍，呈指数增长。Mullis 在 1983 年发明并于 1993 年获诺贝尔奖。
The polymerase chain reaction uses primers flanking the target and cycles through denature, anneal and extend, so the polymerase doubles the template each round, growing exponentially. Mullis invented it in 1983 and won the 1993 Nobel Prize.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
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Mullis 1983 年（1993 诺奖）；Sambrook《分子克隆》
Mullis (1983, Nobel 1993); Sambrook, Molecular Cloning
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL4985002W：Molecular cloning（首版 19
#PCR #引物 #指数扩增
端粒和端粒酶分别有什么作用？
What are the roles of telomeres and telomerase?
端粒是位于染色体末端的重复 DNA 序列，像“保护帽”一样防止染色体末端被降解或错误融合。端粒酶是一种能延长端粒的酶，在干细胞和多数癌细胞中活跃；它的活性下降与细胞衰老有关，相关研究获 2009 年诺贝尔生理学或医学奖。
Telomeres are repetitive DNA sequences at chromosome ends that act as protective caps, preventing degradation or erroneous fusion of chromosome tips. Telomerase is an enzyme that extends telomeres and is active in stem cells and most cancer cells; its decline is linked to cellular aging, a topic honored by the 2009 Nobel Prize in Physiology or Medicine.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
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Alberts 等,《Molecular Biology of the Cell》第6版,Garland Science,2014
B. Alberts et al., Molecular Biology of the Cell, 6th ed., Garland Science, 2014
#端粒 #端粒酶 #细胞衰老
mRNA 是什么，细胞如何把它翻译成蛋白质？
What is mRNA, and how does the cell translate it into protein?
信使 RNA 把 DNA 上的编码抄录出来，带到核糖体；核糖体按密码子逐个招募转运 RNA 携带的氨基酸，肽链随之延长，直到终止密码子。Crick 在 1958 年提出中心法则，Watson 等的《基因分子生物学》系统阐述了这一过程。
Messenger RNA copies the coding sequence from DNA to the ribosome; the ribosome reads each codon and recruits the matching transfer RNA's amino acid, extending the chain until a stop codon. Crick set out the central dogma in 1958; Watson et al. detail the process in 'Molecular Biology of the Gene'.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
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Crick 1958 年中心法则；Watson 等《基因分子生物学》
Crick (central dogma, 1958); Watson et al., Molecular Biology of the Gene
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL222777W：Molecular biology of the
#mRNA #翻译 #核糖体
可变剪接是什么意思？
What is alternative splicing?
一个基因的前体 mRNA 可通过不同方式剪接外显子，产生多种不同的成熟 mRNA 与蛋白质，从而用较少基因实现较高复杂度。Berget、Moore 与 Sharp 在 1977 年发现这一现象，Lodish 的教材详述了其调控。
A gene's pre-mRNA can be spliced in different ways to yield several mature mRNAs and proteins, letting fewer genes create more complexity. Berget, Moore and Sharp discovered this in 1977; Lodish details its regulation.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Berget, Moore & Sharp,《Spliced segments at the 5′ terminus of adenovirus 2 late mRNA》,Proceedings of the National Academy of Sciences,1977 (DOI: 10.1073/pnas.74.8.3171)；Lodish《分子细胞生物学》
Berget, Moore & Sharp, 'Spliced segments at the 5′ terminus of adenovirus 2 late mRNA', Proceedings of the National Academy of Sciences, 1977, DOI: 10.1073/pnas.74.8.3171; Lodish, Molecular Cell Biology
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1073/pnas.74.8.3171
#可变剪接 #外显子 #蛋白质多样性