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乳酸菌CRISPR-Cas系统同源性分析
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作者 李婉 张丹青 +1 位作者 王娜娜 霍贵成 《食品工业科技》 CAS CSCD 北大核心 2016年第11期134-140,146,共8页
CRISPR-Cas系统为乳酸菌抵抗噬菌体等外源基因元件提供获得性免疫,利用生物信息学方法分析了CRISPR序列及cas基因在乳酸菌种间的同源性关系。利用生物信息学方法预测NCBI中已测序的部分乳酸菌所含CRISPRCas系统,并对重复序列和Cas蛋白... CRISPR-Cas系统为乳酸菌抵抗噬菌体等外源基因元件提供获得性免疫,利用生物信息学方法分析了CRISPR序列及cas基因在乳酸菌种间的同源性关系。利用生物信息学方法预测NCBI中已测序的部分乳酸菌所含CRISPRCas系统,并对重复序列和Cas蛋白序列进行系统发生学分析。结果显示,嗜热链球菌、德氏乳杆菌和瑞士乳杆菌标准菌株均含不同数目的 CRISPR-Cas系统,各类型的重复序列高度保守,Cas蛋白序列同源性较高。CRISPR-Cas系统的同源性与其亚型密切相关,而与菌种亲缘关系有较大差异,证明了CRISPR-Cas系统能够通过基因水平转移传播这一结论。 展开更多
关键词 乳酸菌 clustered regularly interspaced SHORT palindromic repeats(crispr)-cas系统 同源性 重复序列 间隔序列
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Experiments that led to the first gene-edited babies: the ethical failings and the urgent need for better governance 被引量:12
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作者 Jing-ru LI Simon WALKER +1 位作者 Jing-bao NIE Xin-qing ZHANG 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2019年第1期32-38,共7页
The rapid developments of science and technology in China over recent decades, particularly in biomedical research, have brought forward serious challenges regarding ethical governance. Recently, Jian-kui HE, a Chines... The rapid developments of science and technology in China over recent decades, particularly in biomedical research, have brought forward serious challenges regarding ethical governance. Recently, Jian-kui HE, a Chinese scientist, claimed to have "created" the first gene-edited babies, designed to be naturally immune to the human immunodeficiency virus(HIV). The news immediately triggered widespread criticism, denouncement, and debate over the scientific and ethical legitimacy of HE’s genetic experiments. China’s guidelines and regulations have banned germline genome editing on human embryos for clinical use because of scientific and ethical concerns, in accordance with the international consensus. HE’s human experimentation has not only violated these Chinese regulations, but also breached other ethical and regulatory norms. These include questionable scientific value, unreasonable risk-benefit ratio, illegitimate ethics review, invalid informed consent, and regulatory misconduct. This series of ethical failings of HE and his team reveal the institutional failure of the current ethics governance system which largely depends on scientist’s self-regulation. The incident highlights the need for urgent improvement of ethics governance at all levels, the enforcement of technical and ethical guidelines, and the establishment of laws relating to such bioethical issues. 展开更多
关键词 Jian-kui HE Human germline gene editing Human immunodeficiency virus (HIV) Clustered regularly interspaced short palindromic repeat (crispr)-cas9 Ethical review
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