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Fundamental and translational research in Cystic Fibrosis - why we still need it. J Cyst Fibros 2023; 22 Suppl 1:S1-S4. [PMID: 36577595 DOI: 10.1016/j.jcf.2022.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 12/19/2022] [Accepted: 12/20/2022] [Indexed: 12/27/2022]
Abstract
Clinical treatments for cystic fibrosis (CF) underwent significant changes in the last decade as therapies targeting the basic defect in the CFTR protein were approved. Significant scientific progress has also been made in several other areas that may lead in the future to novel therapeutic approaches that can help fight CF in all individuals living with this disease. Thus, focusing on fundamental research in the CF field has and will continue to be of great importance. This has been one of the aims of the European Cystic Fibrosis Society (ECFS), which has promoted the ECFS Basic Science Conference (BSC) every year since 2004. This special issue covers the topics featured and discussed at the 17th ECFS BSC, held in Albufeira (Portugal) in March 2022, and highlights advances in understanding CFTR, in using personalized medicine, and in developing innovative strategies to identify breakthrough therapies. This introduction highlights the topics presented throughout this special issue, thereby underscoring the relevance of fundamental research in CF.
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Sharma N, Cutting GR. The genetics and genomics of cystic fibrosis. J Cyst Fibros 2019; 19 Suppl 1:S5-S9. [PMID: 31879237 DOI: 10.1016/j.jcf.2019.11.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 11/06/2019] [Accepted: 11/08/2019] [Indexed: 02/07/2023]
Abstract
Genetics is the branch of biology concerned with study of individual genes and how they work whereas genomics is involved with the analysis of all genes and their interactions. Both of these approaches have been applied extensively to CF. Identification of the CFTR gene initiated the dissection of CF genetics at the molecular level. Subsequently, thousands of variants were found in the gene and the functional consequences of a subset have been studied in detail. The completion of the human genome ushered in a new phase of study where the role of genes beyond CFTR could be evaluated for their contribution to the severity of CF. This will be a brief overview of the contribution of these complementary methods to our understanding of CF pathogenesis.
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Affiliation(s)
- N Sharma
- Department of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - G R Cutting
- Department of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America.
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Cabrini G. Innovative Therapies for Cystic Fibrosis: The Road from Treatment to Cure. Mol Diagn Ther 2019; 23:263-279. [PMID: 30478715 DOI: 10.1007/s40291-018-0372-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Cystic fibrosis (CF), a life-threatening multiorgan genetic disease, is facing a new era of research and development using innovative gene-directed personalized therapies. The priority organ to cure is the lung, which suffers recurrent and chronic bacterial infection and inflammation since infancy, representing the main cause of morbidity and precocious mortality of these individuals. After the disappointing failure of gene-replacement approaches using gene therapy vectors, no single drug is presently available to repair all the CF gene defects. The impressive number of different CF gene mutations is now tackled with different chemical and biotechnological tools tailored to the specific molecular derangements, thanks to the extensive knowledge acquired over many years on the mechanisms of CF cell and organ pathology. This review provides an overview and recalls both the successes and limitations of the different experimental approaches, such as high-throughput screening on chemical libraries to discover CF gene correctors and potentiators, dual-acting compounds, read-through molecules, splicing defect repairing tools, cystic fibrosis transmembrane conductance regulator (CFTR) "amplifiers," CFTR interactome modulators and the first gene editing attempts.
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Affiliation(s)
- Giulio Cabrini
- Laboratory of Molecular Pathology, University Hospital, Verona, Italy. .,Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
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Pelleri MC, Cicchini E, Petersen MB, Tranebjærg L, Mattina T, Magini P, Antonaros F, Caracausi M, Vitale L, Locatelli C, Seri M, Strippoli P, Piovesan A, Cocchi G. Partial trisomy 21 map: Ten cases further supporting the highly restricted Down syndrome critical region (HR-DSCR) on human chromosome 21. Mol Genet Genomic Med 2019; 7:e797. [PMID: 31237416 PMCID: PMC6687668 DOI: 10.1002/mgg3.797] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 05/22/2019] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Down syndrome (DS) is characterized by the presence of an extra full or partial human chromosome 21 (Hsa21). An invaluable model to define genotype-phenotype correlations in DS is the study of the extremely rare cases of partial (segmental) trisomy 21 (PT21), the duplication of only a delimited region of Hsa21 associated or not to DS. A systematic retrospective reanalysis of 125 PT21 cases described up to 2015 allowed the creation of the most comprehensive PT21 map and the identification of a 34-kb highly restricted DS critical region (HR-DSCR) as the minimal region whose duplication is shared by all PT21 subjects diagnosed with DS. We reanalyzed at higher resolution three cases previously published and we accurately searched for any new PT21 reports in order to verify whether HR-DSCR limits could prospectively be confirmed and possibly refined. METHODS Hsa21 partial duplications of three PT21 subjects were refined by adding array-based comparative genomic hybridization data. Seven newly described PT21 cases fulfilling stringent cytogenetic and clinical criteria have been incorporated into the PT21 integrated map. RESULTS The PT21 map now integrates fine structure of Hsa21 sequence intervals of 132 subjects onto a common framework fully consistent with the presence of a duplicated HR-DSCR, on distal 21q22.13 sub-band, only in DS subjects and not in non-DS individuals. No documented exception to the HR-DSCR model was found. CONCLUSIONS The findings presented here further support the association of the HR-DSCR with the diagnosis of DS, representing an unbiased validation of the original model. Further studies are needed to identify and characterize genetic determinants presumably located in the HR-DSCR and functionally associated to the critical manifestations of DS.
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Affiliation(s)
- Maria Chiara Pelleri
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Unit of Histology, Embryology and Applied BiologyUniversity of BolognaBologna (BO)Italy
| | - Elena Cicchini
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Unit of Histology, Embryology and Applied BiologyUniversity of BolognaBologna (BO)Italy
| | - Michael B. Petersen
- Department of GeneticsAalborg University HospitalAalborgDenmark
- Department of Clinical GeneticsAalborg UniversityAalborgDenmark
| | - Lisbeth Tranebjærg
- Department of Clinical Genetics/RigshospitaletThe Kennedy CentreGlostrupDenmark
- University of Copenhagen, Institute of Clinical Medicine, The Panum InstituteCopenhagen NDenmark
| | - Teresa Mattina
- Department of PediatricsMedical Genetics University of CataniaItaly
| | - Pamela Magini
- Medical Genetics UnitSt. Orsola‐Malpighi PolyclinicBologna (BO)Italy
| | - Francesca Antonaros
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Unit of Histology, Embryology and Applied BiologyUniversity of BolognaBologna (BO)Italy
| | - Maria Caracausi
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Unit of Histology, Embryology and Applied BiologyUniversity of BolognaBologna (BO)Italy
| | - Lorenza Vitale
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Unit of Histology, Embryology and Applied BiologyUniversity of BolognaBologna (BO)Italy
| | | | - Marco Seri
- Medical Genetics Unit, Department of Medical and Surgical Sciences (DIMEC)St. Orsola‐Malpighi Polyclinic, University of BolognaBologna (BO)Italy
| | - Pierluigi Strippoli
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Unit of Histology, Embryology and Applied BiologyUniversity of BolognaBologna (BO)Italy
| | - Allison Piovesan
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Unit of Histology, Embryology and Applied BiologyUniversity of BolognaBologna (BO)Italy
| | - Guido Cocchi
- Neonatology Unit, Department of Medical and Surgical Sciences (DIMEC)St. Orsola‐Malpighi Polyclinic, University of BolognaBologna (BO)Italy
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Mention K, Santos L, Harrison PT. Gene and Base Editing as a Therapeutic Option for Cystic Fibrosis-Learning from Other Diseases. Genes (Basel) 2019; 10:E387. [PMID: 31117296 PMCID: PMC6562706 DOI: 10.3390/genes10050387] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 05/11/2019] [Accepted: 05/15/2019] [Indexed: 12/21/2022] Open
Abstract
Cystic fibrosis (CF) is a monogenic autosomal recessive disorder caused by mutations in the CFTR gene. There are at least 346 disease-causing variants in the CFTR gene, but effective small-molecule therapies exist for only ~10% of them. One option to treat all mutations is CFTR cDNA-based therapy, but clinical trials to date have only been able to stabilise rather than improve lung function disease in patients. While cDNA-based therapy is already a clinical reality for a number of diseases, some animal studies have clearly established that precision genome editing can be significantly more effective than cDNA addition. These observations have led to a number of gene-editing clinical trials for a small number of such genetic disorders. To date, gene-editing strategies to correct CFTR mutations have been conducted exclusively in cell models, with no in vivo gene-editing studies yet described. Here, we highlight some of the key breakthroughs in in vivo and ex vivo gene and base editing in animal models for other diseases and discuss what might be learned from these studies in the development of editing strategies that may be applied to cystic fibrosis as a potential therapeutic approach. There are many hurdles that need to be overcome, including the in vivo delivery of editing machinery or successful engraftment of ex vivo-edited cells, as well as minimising potential off-target effects. However, a successful proof-of-concept study for gene or base editing in one or more of the available CF animal models could pave the way towards a long-term therapeutic strategy for this disease.
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Affiliation(s)
- Karen Mention
- Department of Physiology, University College Cork, Cork T12 K8AF, Ireland.
| | - Lúcia Santos
- Department of Physiology, University College Cork, Cork T12 K8AF, Ireland.
- University of Lisboa Faculty of Sciences, BioISI-Biosystems & Integrative Sciences Institute, 1749-016 Lisboa, Portugal.
| | - Patrick T Harrison
- Department of Physiology, University College Cork, Cork T12 K8AF, Ireland.
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Abstract
Cystic fibrosis (CF) is the most common life-limiting genetic disease in Caucasian patients. Continued advances have led to improved survival, and adults with CF now outnumber children. As our understanding of the disease improves, new therapies have emerged that improve the basic defect, enabling patient-specific treatment and improved outcomes. However, recurrent exacerbations continue to lead to morbidity and mortality, and new pathogens have been identified that may lead to worse outcomes. In addition, new complications, such as CF-related diabetes and increased risk of gastrointestinal cancers, are creating new challenges in management. For patients with end-stage disease, lung transplantation has remained one of the few treatment options, but challenges in identifying the most appropriate patients remain.
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Affiliation(s)
- Michael M Rey
- Division of Pulmonary, Allergy and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA; , ,
| | - Michael P Bonk
- Division of Pulmonary, Allergy and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA; , ,
| | - Denis Hadjiliadis
- Division of Pulmonary, Allergy and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA; , ,
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Harman K, Dobra R, Davies JC. Disease-modifying drug therapy in cystic fibrosis. Paediatr Respir Rev 2018; 26:7-9. [PMID: 28583720 DOI: 10.1016/j.prrv.2017.03.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 03/07/2017] [Indexed: 12/31/2022]
Abstract
Whilst substantial progress has been made in the treatment of cystic fibrosis, the disease still carries a significant burden in terms of symptoms, requirement for treatment and early mortality. The last decade has witnessed a new era in the development of small molecule drugs targeting the CFTR protein, which for the first time may provide a truly disease-modifying approach to treatment. This article reviews progress and highlights some of the current and future challenges in CFTR modulator therapies.
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Affiliation(s)
- Katharine Harman
- Imperial College London & Royal Brompton & Harefield NHS Trust, London, UK
| | - Rebecca Dobra
- Imperial College London & Royal Brompton & Harefield NHS Trust, London, UK
| | - Jane C Davies
- Imperial College London & Royal Brompton & Harefield NHS Trust, London, UK.
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Harrison PT, Hart S. A beginner's guide to gene editing. Exp Physiol 2018; 103:439-448. [DOI: 10.1113/ep086047] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 12/19/2017] [Indexed: 12/11/2022]
Affiliation(s)
- Patrick T. Harrison
- Department of Physiology, BioSciences Institute; University College Cork; Cork Ireland
| | - Stephen Hart
- UCL Great Ormond Street Institute of Child Health; University College London; London UK
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Hart SL, Harrison PT. Genetic therapies for cystic fibrosis lung disease. Curr Opin Pharmacol 2017; 34:119-124. [PMID: 29107808 DOI: 10.1016/j.coph.2017.10.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 10/02/2017] [Accepted: 10/16/2017] [Indexed: 12/26/2022]
Abstract
Gene therapy for cystic fibrosis (CF) has been the subject of intense research over the last twenty-five years or more, using both viral and liposomal delivery methods, but so far without the emergence of a clinical therapy. New approaches to CF gene therapy involving recent improvements to vector systems, both viral and non-viral, as well as new nucleic acid technologies have led to renewed interest in the field. The field of therapeutic gene editing is rapidly developing with the emergence of CRISPR/Cas9 as well as chemically modified mRNA therapeutics. These new types of nucleic acid therapies are also a good fit with delivery by non-viral delivery approaches which has led to a renewed interest in lipid-based and other nanoformulations.
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Affiliation(s)
- Stephen L Hart
- Experimental and Personalised Medicines Section, Genetics and Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, 30 Guilford St, London WC1N 1EH, UK.
| | - Patrick T Harrison
- Department of Physiology, BioSciences Institute, University College Cork, Cork, Ireland
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Animal and model systems for studying cystic fibrosis. J Cyst Fibros 2017; 17:S28-S34. [PMID: 28939349 DOI: 10.1016/j.jcf.2017.09.001] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 08/31/2017] [Accepted: 09/01/2017] [Indexed: 01/07/2023]
Abstract
The cystic fibrosis (CF) field is the beneficiary of five species of animal models that lack functional cystic fibrosis transmembrane conductance regulator (CFTR) channel. These models are rapidly informing mechanisms of disease pathogenesis and CFTR function regardless of how faithfully a given organ reproduces the human CF phenotype. New approaches of genetic engineering with RNA-guided nucleases are rapidly expanding both the potential types of models available and the approaches to correct the CFTR defect. The application of new CRISPR/Cas9 genome editing techniques are similarly increasing capabilities for in vitro modeling of CFTR functions in cell lines and primary cells using air-liquid interface cultures and organoids. Gene editing of CFTR mutations in somatic stem cells and induced pluripotent stem cells is also transforming gene therapy approaches for CF. This short review evaluates several areas that are key to building animal and cell systems capable of modeling CF disease and testing potential treatments.
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Sanz DJ, Hollywood JA, Scallan MF, Harrison PT. Cas9/gRNA targeted excision of cystic fibrosis-causing deep-intronic splicing mutations restores normal splicing of CFTR mRNA. PLoS One 2017; 12:e0184009. [PMID: 28863137 PMCID: PMC5581164 DOI: 10.1371/journal.pone.0184009] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 08/16/2017] [Indexed: 12/27/2022] Open
Abstract
Cystic Fibrosis is an autosomal recessive disorder caused by mutations in the CFTR gene. CRISPR mediated, template-dependent homology-directed gene editing has been used to correct the most common mutation, c.1521_1523delCTT / p.Phe508del (F508del) which affects ~70% of individuals, but the efficiency was relatively low. Here, we describe a high efficiency strategy for editing of three different rare CFTR mutations which together account for about 3% of individuals with Cystic Fibrosis. The mutations cause aberrant splicing of CFTR mRNA due to the creation of cryptic splice signals that result in the formation of pseudoexons containing premature stop codons c.1679+1634A>G (1811+1.6kbA>G) and c.3718-2477C>T (3849+10kbC>T), or an out-of-frame 5' extension to an existing exon c.3140-26A>G (3272-26A>G). We designed pairs of Cas9 guide RNAs to create targeted double-stranded breaks in CFTR either side of each mutation which resulted in high efficiency excision of the target genomic regions via non-homologous end-joining repair. When evaluated in a mini-gene splicing assay, we showed that targeted excision restored normal splicing for all three mutations. This approach could be used to correct aberrant splicing signals or remove disruptive transcription regulatory motifs caused by deep-intronic mutations in a range of other genetic disorders.
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Affiliation(s)
- David J. Sanz
- Department of Physiology, BioSciences Institute, University College Cork, Cork, Ireland
| | - Jennifer A. Hollywood
- Department of Physiology, BioSciences Institute, University College Cork, Cork, Ireland
- School of Microbiology, University College Cork, Cork, Ireland
| | | | - Patrick T. Harrison
- Department of Physiology, BioSciences Institute, University College Cork, Cork, Ireland
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Bactericidal and Fungicidal Activity of N-Chlorotaurine Is Enhanced in Cystic Fibrosis Sputum Medium. Antimicrob Agents Chemother 2017; 61:AAC.02527-16. [PMID: 28223376 DOI: 10.1128/aac.02527-16] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 02/11/2017] [Indexed: 02/06/2023] Open
Abstract
Lung infections with multiresistant pathogens are a major problem among patients suffering from cystic fibrosis (CF). N-Chlorotaurine (NCT), a microbicidal active chlorine compound with no development of resistance, is well tolerated upon inhalation. The aim of this study was to investigate the in vitro bactericidal and fungicidal activity of NCT in artificial sputum medium (ASM), which mimics the composition of CF mucus. The medium was inoculated with bacteria (Staphylococcus aureus, including some methicillin-resistant S. aureus [MRSA] strains, Pseudomonas aeruginosa, and Escherichia coli) or spores of fungi (Aspergillus fumigatus, Aspergillus terreus, Candida albicans, Scedosporium apiospermum, Scedosporium boydii, Lomentospora prolificans, Scedosporium aurantiacum, Scedosporium minutisporum, Exophiala dermatitidis, and Geotrichum sp.), to final concentrations of 107 to 108 CFU/ml. NCT was added at 37°C, and time-kill assays were performed. At a concentration of 1% (10 mg/ml, 55 mM) NCT, bacteria and spores were killed within 10 min and 15 min, respectively, to the detection limit of 102 CFU/ml (reduction of 5 to 6 log10 units). Reductions of 2 log10 units were still achieved with 0.1% (bacteria) and 0.3% (fungi) NCT, largely within 10 to 30 min. Measurements by means of iodometric titration showed oxidizing activity for 1, 30, 60, and >60 min at concentrations of 0.1%, 0.3%, 0.5%, and 1.0% NCT, respectively, which matches the killing test results. NCT demonstrated broad-spectrum microbicidal activity in the milieu of CF mucus at concentrations ideal for clinical use. The microbicidal activity of NCT in ASM was even stronger than that in buffer solution; this was particularly pronounced for fungi. This finding can be explained largely by the formation, through transhalogenation, of monochloramine, which rapidly penetrates pathogens.
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Hollywood JA, Lee CM, Scallan MF, Harrison PT. Analysis of gene repair tracts from Cas9/gRNA double-stranded breaks in the human CFTR gene. Sci Rep 2016; 6:32230. [PMID: 27557525 PMCID: PMC4997560 DOI: 10.1038/srep32230] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 08/04/2016] [Indexed: 12/18/2022] Open
Abstract
To maximise the efficiency of template-dependent gene editing, most studies describe programmable and/or RNA-guided endonucleases that make a double-stranded break at, or close to, the target sequence to be modified. The rationale for this design strategy is that most gene repair tracts will be very short. Here, we describe a CRISPR Cas9/gRNA selection-free strategy which uses deep sequencing to characterise repair tracts from a donor plasmid containing seven nucleotide differences across a 216 bp target region in the human CFTR gene. We found that 90% of the template-dependent repair tracts were >100 bp in length with equal numbers of uni-directional and bi-directional repair tracts. The occurrence of long repair tracts suggests that a single gRNA could be used with variants of the same template to create or correct specific mutations within a 200 bp range, the size of ~80% of human exons. The selection-free strategy used here also allowed detection of non-homologous end joining events in many of the homology-directed repair tracts. This indicates a need to modify the donor, possibly by silent changes in the PAM sequence, to prevent creation of a second double-stranded break in an allele that has already been correctly edited by homology-directed repair.
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Affiliation(s)
- Jennifer A. Hollywood
- Department of Physiology, University College Cork, Cork, Ireland
- Department of Microbiology, University College Cork, Cork, Ireland
| | - Ciaran M. Lee
- Department of Physiology, University College Cork, Cork, Ireland
- Department of Microbiology, University College Cork, Cork, Ireland
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Affiliation(s)
- Pablo Perez-Pinera
- Department of Bioengineering, University of Illinois at Urbana-Champaign, 1270 Digital Computer Laboratory, MC-278, 1304 West Springfield Avenue, Urbana, IL, 61801, USA. .,Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
| | - Zheng-Yi Chen
- Department of Otolaryngology, Harvard Medical School and Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA, 02114, USA.
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