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Kobayashi S, O'Hashi K, Kaneko K, Kobayashi S, Ogisawa S, Tonogi M, Fujita S, Kobayashi M. A new phenotype identification method with the fluorescent expression in cross-sectioned tails in Thy1-GCaMP6s transgenic mice. J Oral Sci 2022; 64:156-160. [PMID: 35173099 DOI: 10.2334/josnusd.21-0528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
PURPOSE Unless the phenotype of the transgenic mice is distinguishable, genotyping in each mouse is required prior to experiments. This study aimed to establish a new identification method for the phenotype in Thy1-GCaMP6s transgenic mice to reduce the cost and time. METHODS Tail biopsies (2 mm) were performed under general anesthesia with isoflurane in 3 to 4-week-old mice. Then, the resected tail was cut again with a sharp razor, and the cross-sections were observed with two-photon microscopy (excitation wavelength = 940 nm). The emitted light was split into green and red light by a dichroic mirror (570 nm) with bandpass filters (495-540 nm for green, 575-645 nm for red). RESULTS Two types of expressed fluorescent pattern were found in the tail tissue: the presence of green fluorescent structures (type 1) and the absence of the structures (type 2). Cortical imaging confirmed that type 1 expressed the cortical GCaMP6s, while type 2 did not. CONCLUSION These results suggest that observation of the cross-sectioned tail in Thy1-GCaMP6s mice enabled to identify the phenotype within approximately 10 min/mouse, which reduces the cost and time for genotyping.
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Affiliation(s)
- Shutaro Kobayashi
- Department of Pharmacology, Nihon University School of Dentistry.,Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry
| | - Kazunori O'Hashi
- Department of Pharmacology, Nihon University School of Dentistry.,Division of Oral and Craniomaxillofacial Research, Dental Research Center, Nihon University School of Dentistry.,Department of Mental Disorder Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry
| | - Keisuke Kaneko
- Department of Pharmacology, Nihon University School of Dentistry.,Department of Anesthesiology, Nihon University School of Dentistry
| | - Satomi Kobayashi
- Department of Pharmacology, Nihon University School of Dentistry.,Division of Oral and Craniomaxillofacial Research, Dental Research Center, Nihon University School of Dentistry.,Department of Biology, Nihon University School of Dentistry
| | - Shouhei Ogisawa
- Department of Pharmacology, Nihon University School of Dentistry.,Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry
| | - Morio Tonogi
- Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry
| | - Satoshi Fujita
- Division of Oral and Craniomaxillofacial Research, Dental Research Center, Nihon University School of Dentistry.,Department of Biology, Nihon University School of Dentistry
| | - Masayuki Kobayashi
- Department of Pharmacology, Nihon University School of Dentistry.,Division of Oral and Craniomaxillofacial Research, Dental Research Center, Nihon University School of Dentistry.,Molecular Dynamics Imaging Unit, RIKEN Center for Life Science Technologies
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Deng HX, Zhai H, Shi Y, Liu G, Lowry J, Liu B, Ryan ÉB, Yan J, Yang Y, Zhang N, Yang Z, Liu E, Ma YC, Siddique T. Efficacy and long-term safety of CRISPR/Cas9 genome editing in the SOD1-linked mouse models of ALS. Commun Biol 2021; 4:396. [PMID: 33767386 PMCID: PMC7994668 DOI: 10.1038/s42003-021-01942-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 03/03/2021] [Indexed: 01/31/2023] Open
Abstract
CRISPR/Cas9-mediated genome editing provides potential for therapeutic development. Efficacy and long-term safety represent major concerns that remain to be adequately addressed in preclinical studies. Here we show that CRISPR/Cas9-mediated genome editing in two distinct SOD1-amyotrophic lateral sclerosis (ALS) transgenic mouse models prevented the development of ALS-like disease and pathology. The disease-linked transgene was effectively edited, with rare off-target editing events. We observed frequent large DNA deletions, ranging from a few hundred to several thousand base pairs. We determined that these large deletions were mediated by proximate identical sequences in Alu elements. No evidence of other diseases was observed beyond 2 years of age in these genome edited mice. Our data provide preclinical evidence of the efficacy and long-term safety of the CRISPR/Cas9 therapeutic approach. Moreover, the molecular mechanism of proximate identical sequences-mediated recombination provides mechanistic information to optimize therapeutic targeting design, and to avoid or minimize unintended and potentially deleterious recombination events.
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Affiliation(s)
- Han-Xiang Deng
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
| | - Hong Zhai
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Yong Shi
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Guoxiang Liu
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Jessica Lowry
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Bin Liu
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Éanna B Ryan
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Jianhua Yan
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Yi Yang
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Nigel Zhang
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Zhihua Yang
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Erdong Liu
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Yongchao C Ma
- Departments of Pediatrics, Neurology and Physiology, Ann & Robert H. Lurie Children's Hospital of Chicago, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Teepu Siddique
- The Ken and Ruth Davee Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
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Ohnesorg T, Eggers S, Leonhard WN, Sinclair AH, White SJ. Rapid high-throughput analysis of DNaseI hypersensitive sites using a modified Multiplex Ligation-dependent Probe Amplification approach. BMC Genomics 2009; 10:412. [PMID: 19728890 PMCID: PMC2748097 DOI: 10.1186/1471-2164-10-412] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2009] [Accepted: 09/04/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Mapping DNaseI hypersensitive sites is commonly used to identify regulatory regions in the genome. However, currently available methods are either time consuming and laborious, expensive or require large numbers of cells. We aimed to develop a quick and straightforward method for the analysis of DNaseI hypersensitive sites that overcomes these problems. RESULTS We have developed a modified Multiplex Ligation-dependent Probe Amplification (MLPA) approach for the identification and analysis of genomic regulatory regions. The utility of this approach was demonstrated by simultaneously analysing 20 loci from the ENCODE project for DNaseI hypersensitivity in a range of different cell lines. We were able to obtain reproducible results with as little as 5 x 10(4) cells per DNaseI treatment. Our results broadly matched those previously reported by the ENCODE project, and both technical and biological replicates showed high correlations, indicating the sensitivity and reproducibility of this method. CONCLUSION This new method will considerably facilitate the identification and analysis of DNaseI hypersensitive sites. Due to the multiplexing potential of MLPA (up to 50 loci can be examined) it is possible to analyse dozens of DNaseI hypersensitive sites in a single reaction. Furthermore, the high sensitivity of MLPA means that fewer than 10(5) cells per DNaseI treatment can be used, allowing the discovery and analysis of tissue specific regulatory regions without the need for pooling. This method is quick and easy and results can be obtained within 48 hours after harvesting of cells or tissues. As no special equipment is required, this method can be applied by any laboratory interested in the analysis of DNaseI hypersensitive regions.
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Affiliation(s)
- Thomas Ohnesorg
- Murdoch Children's Research Institute and Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC, Australia
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