Tissue-specific knockout technology enables the analysis of the gene function in specific tissues in adult ***,conventional strategy for producing tissue-specific knockout mice is a time- and labor-consuming process,r...
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Tissue-specific knockout technology enables the analysis of the gene function in specific tissues in adult ***,conventional strategy for producing tissue-specific knockout mice is a time- and labor-consuming process,restricting rapid study of the gene function in ***-Cas9 system from bacteria is a simple and efficient gene-editing technique,which has enabled rapid generation of gene knockout lines in mouse by direct injection of CRISPR-Cas9 into ***,we demonstrate CRISPR-Cas9-mediated spermatogenic cell-specific disruption of Scp3 gene in testes in one *** first generated transgenic mice by pronuclear injection of a plasmid containing Hspa2 promoter driving Cas9 expression and showed Cas9 specific expression in spermatogenic *** then produced transgenic mice carrying Hspa2 promoter driven Cas9 and constitutive expressed sgRNA targeting Scp3 *** founders were infertile due to developmental arrest of spermatogenic cells while female founders could produce progeny ***,male progeny from female founders were infertile and females could transmit the transgenes to the next *** study establishes a CRISPR-Cas9-based one-step strategy to analyze the gene function in adult tissues by a temporal-spatial pattern.
Dear Editor,Mammalian haploid embryonic stem cells (haESCs) have been recently generated from parthenogenetic and androgenetic embryos [1, 2].Both parthenogenetic haESCs (PG-haESCs) and androgenetic haESCs (AG-haESCs)...
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Dear Editor,Mammalian haploid embryonic stem cells (haESCs) have been recently generated from parthenogenetic and androgenetic embryos [1, 2].Both parthenogenetic haESCs (PG-haESCs) and androgenetic haESCs (AG-haESCs) can be used for cell-based reverse and forward genetic screens on a whole-genome scale [3, 4].AG-haESCs, after intracytoplasmic injection into oocytes (referred to as ICAHCI), can be used as a sperm replacement to produce healthy semi-cloned (SC) mice at a rateof~2% of transferred embryos [5, 6].
作者:
Yuxuan WuHai ZhouXiaoying FanYing ZhangMan ZhangYinghua WangZhenfei XieGroup of Epigenetic Reprogramming
State Key Laboratory of Cell Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China Shanghai Key Laboratory of Molecular Andrology
Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China Group of Epigenetic Reprogramming
State Key Laboratory of Cell Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China Shanghai Key Laboratory of Molecular Andrology
Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China College of Life Science
China West Normal University Nanchong Sichuan 637002 China Biodynamic Optical Imaging Center
Ministry of Education Key Laboratory of Cell Proliferation and Differentiation College of Life Sciences Peking University Beijing 100871 China Shanghai Key Laboratory of Molecular Andrology
Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China State Key Laboratory of Molecular Biology
Shanghai Key Laboratory of Molecular Andrology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China
Spermatogonial stem cells (SSCs) can produce numerous male gametes after transplantation into recipient testes, presenting a valuable approach for gene therapy and continuous production of gene-modified animals. Howev...
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Spermatogonial stem cells (SSCs) can produce numerous male gametes after transplantation into recipient testes, presenting a valuable approach for gene therapy and continuous production of gene-modified animals. However, successful genetic manipulation of SSCs has been limited, partially due to complexity and low efficiency of currently available genetic editing techniques. Here, we show that efficient genetic modifications can be introduced into SSCs using the CRISPR-Cas9 system. We used the CRISPR-Cas9 system to mutate an EGFP transgene or the endogenous Crygc gene in SCCs. The mutated SSCs underwent spermatogenesis after transplantation into the seminiferous tubules of infertile mouse testes. Round spermatids were generated and, after injection into mature oocytes, supported the production of heterozygous offspring displaying the corresponding mutant phenotypes. Furthermore, a disease-causing mutation in Crygc (Crygc−/−) that pre-existed in SSCs could be readily repaired by CRISPR-Cas9-induced nonhomologous end joining (NHEJ) or homology-directed repair (HDR), resulting in SSC lines carrying the corrected gene with no evidence of off-target modifications as shown by whole-genome sequencing. Fertilization using round spermatids generated from these lines gave rise to offspring with the corrected phenotype at an efficiency of 100%. Our results demonstrate efficient gene editing in mouse SSCs by the CRISPR-Cas9 system, and provide the proof of principle of curing a genetic disease via gene correction in SSCs.
Research in the synthetic biology field, which attempts to bring about new technologies by understanding life through the process of "artificially creating" biomolecules and biological systems, is becoming e...
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Here we report a unique cellular reprogramming phenomenon, called stimulus-triggered acquisition of pluripotency (STAP), which requires neither nuclear transfer nor the introduction of transcription factors. In STAP, ...
Here we report a unique cellular reprogramming phenomenon, called stimulus-triggered acquisition of pluripotency (STAP), which requires neither nuclear transfer nor the introduction of transcription factors. In STAP, strong external stimuli such as a transient low-pH stressor reprogrammed mammalian somatic cells, resulting in the generation of pluripotent cells. Through real-time imaging of STAP cells derived from purified lymphocytes, as well as gene rearrangement analysis, we found that committed somatic cells give rise to STAP cells by reprogramming rather than selection. STAP cells showed a substantial decrease in DNA methylation in the regulatory regions of pluripotency marker genes. Blastocyst injection showed that STAP cells efficiently contribute to chimaeric embryos and to offspring via germline transmission. We also demonstrate the derivation of robustly expandable pluripotent cell lines from STAP cells. Thus, our findings indicate that epigenetic fate determination of mammalian cells can be markedly converted in a context-dependent manner by strong environmental cues.
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