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Baudrier L, Benamozig O, Langley J, Chopra S, Kalashnikova T, Benaoudia S, Singh G, Mahoney DJ, Wright NAM, Billon P. One-pot DTECT enables rapid and efficient capture of genetic signatures for precision genome editing and clinical diagnostics. Cell Rep Methods 2024; 4:100698. [PMID: 38301655 PMCID: PMC10921016 DOI: 10.1016/j.crmeth.2024.100698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 12/05/2023] [Accepted: 01/09/2024] [Indexed: 02/03/2024]
Abstract
The detection of genomic sequences and their alterations is crucial for basic research and clinical diagnostics. However, current methodologies are costly and time-consuming and require outsourcing sample preparation, processing, and analysis to genomic companies. Here, we establish One-pot DTECT, a platform that expedites the detection of genetic signatures, only requiring a short incubation of a PCR product in an optimized one-pot mixture. One-pot DTECT enables qualitative, quantitative, and visual detection of biologically relevant variants, such as cancer mutations, and nucleotide changes introduced by prime editing and base editing into cancer cells and human primary T cells. Notably, One-pot DTECT achieves quantification accuracy for targeted genetic signatures comparable with Sanger and next-generation sequencing. Furthermore, its effectiveness as a diagnostic platform is demonstrated by successfully detecting sickle cell variants in blood and saliva samples. Altogether, One-pot DTECT offers an efficient, versatile, adaptable, and cost-effective alternative to traditional methods for detecting genomic signatures.
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Affiliation(s)
- Lou Baudrier
- The University of Calgary, Cumming School of Medicine, Department of Biochemistry and Molecular Biology, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Robson DNA Science Centre, Calgary, AB, Canada; Arnie Charbonneau Cancer Institute, Calgary, AB, Canada
| | - Orléna Benamozig
- The University of Calgary, Cumming School of Medicine, Department of Biochemistry and Molecular Biology, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Robson DNA Science Centre, Calgary, AB, Canada; Arnie Charbonneau Cancer Institute, Calgary, AB, Canada
| | - Jethro Langley
- The University of Calgary, Cumming School of Medicine, Department of Biochemistry and Molecular Biology, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Robson DNA Science Centre, Calgary, AB, Canada; Arnie Charbonneau Cancer Institute, Calgary, AB, Canada
| | - Sanchit Chopra
- The University of Calgary, Cumming School of Medicine, Department of Biochemistry and Molecular Biology, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Robson DNA Science Centre, Calgary, AB, Canada; Arnie Charbonneau Cancer Institute, Calgary, AB, Canada
| | - Tatiana Kalashnikova
- Alberta Children's Hospital Research Institute, Calgary, AB, Canada; The University of Calgary, Cumming School of Medicine, Department of Pediatrics, 28 Oki Drive NW, Calgary, AB T3B 6A8, Canada
| | - Sacha Benaoudia
- Arnie Charbonneau Cancer Institute, Calgary, AB, Canada; Alberta Children's Hospital Research Institute, Calgary, AB, Canada
| | - Gurpreet Singh
- Alberta Children's Hospital Research Institute, Calgary, AB, Canada; The University of Calgary, Cumming School of Medicine, Department of Pediatrics, 28 Oki Drive NW, Calgary, AB T3B 6A8, Canada
| | - Douglas J Mahoney
- The University of Calgary, Cumming School of Medicine, Department of Biochemistry and Molecular Biology, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Arnie Charbonneau Cancer Institute, Calgary, AB, Canada; Alberta Children's Hospital Research Institute, Calgary, AB, Canada; Snyder Institute for Chronic Disease, Calgary, AB, Canada; Department of Microbiology, Immunology and Infectious Disease, Calgary, AB, Canada
| | - Nicola A M Wright
- Alberta Children's Hospital Research Institute, Calgary, AB, Canada; The University of Calgary, Cumming School of Medicine, Department of Pediatrics, 28 Oki Drive NW, Calgary, AB T3B 6A8, Canada
| | - Pierre Billon
- The University of Calgary, Cumming School of Medicine, Department of Biochemistry and Molecular Biology, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Robson DNA Science Centre, Calgary, AB, Canada; Arnie Charbonneau Cancer Institute, Calgary, AB, Canada.
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Rubtsov V, Chumaevskii A, Gusarova A, Knyazhev E, Gurianov D, Zykova A, Kalashnikova T, Cheremnov A, Savchenko N, Vorontsov A, Utyaganova V, Kolubaev E, Tarasov S. Macro- and Microstructure of In Situ Composites Prepared by Friction Stir Processing of AA5056 Admixed with Copper Powders. Materials (Basel) 2023; 16:1070. [PMID: 36770078 PMCID: PMC9919765 DOI: 10.3390/ma16031070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/18/2023] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
This paper is devoted to using multi-pass friction stir processing (FSP) for admixing 1.5 to 30 vol.% copper powders into an AA5056 matrix for the in situ fabrication of a composite alloy reinforced by Al-Cu intermetallic compounds (IMC). Macrostructurally inhomogeneous stir zones have been obtained after the first FSP passes, the homogeneity of which was improved with the following FSP passes. As a result of stirring the plasticized AA5056, the initial copper particle agglomerates were compacted into large copper particles, which were then simultaneously saturated by aluminum. Microstructural investigations showed that various phases such as α-Al(Cu), α-Cu(Al) solid solutions, Cu3Al and CuAl IMCs, as well as both S and S'-Al2CuMg precipitates have been detected in the AA5056/Cu stir zone, depending upon the concentration of copper and the number of FSP passes. The number of IMCs increased with the number of FSP passes, enhancing microhardness by 50-55%. The effect of multipass FSP on tensile strength, yield stress and strain-to-fracture was analyzed.
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Chandra S, Kalashnikova T, Wright NAM, Dávila Saldaña BJ. Primary Immunodeficiencies and Hematologic Malignancies: A Diagnostic Approach. Front Immunol 2022; 13:852937. [PMID: 35371103 PMCID: PMC8971519 DOI: 10.3389/fimmu.2022.852937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 02/28/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Sharat Chandra
- Division of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Tatiana Kalashnikova
- Department of Pediatrics, Alberta Children’s Hospital, University of Calgary, Calgary, AB, Canada
| | - Nicola A. M. Wright
- Department of Pediatrics, Alberta Children’s Hospital, University of Calgary, Calgary, AB, Canada
| | - Blachy J. Dávila Saldaña
- Division of Blood and Marrow Transplantation, Children’s National Hospital, Washington, DC, United States
- Department of Pediatrics, George Washington University, Washington, DC, United States
- *Correspondence: Blachy J. Dávila Saldaña,
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Garland A, Keller H, Quail P, Boscart V, Heyer M, Ramsey C, Vucea V, Choi N, Bains I, King S, Oshchepkova T, Kalashnikova T, Kroetsch B, Steer J, Heckman G. BABEL (Better tArgeting, Better outcomes for frail ELderly patients) advance care planning: a comprehensive approach to advance care planning in nursing homes: a cluster randomised trial. Age Ageing 2022; 51:6552807. [PMID: 35325020 PMCID: PMC8946666 DOI: 10.1093/ageing/afac049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 12/24/2021] [Indexed: 11/23/2022] Open
Abstract
Background Nursing home (NH) residents should have the opportunity to consider, discuss and document their healthcare wishes. However, such advance care planning (ACP) is frequently suboptimal. Objective Assess a comprehensive, person-centred ACP approach. Design Unblinded, cluster randomised trial. Setting Fourteen control and 15 intervention NHs in three Canadian provinces, 2018–2020. Subjects 713 residents (442 control, 271 intervention) aged ≥65 years, with elevated mortality risk. Methods The intervention was a structured, \documentclass[12pt]{minimal}
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}{}$\sim$\end{document}60-min discussion between a resident, substitute decision-maker (SDM) and nursing home staff to: (i) confirm SDMs’ identities and role; (ii) prepare SDMs for medical emergencies; (iii) explain residents’ clinical condition and prognosis; (iv) ascertain residents’ preferred philosophy to guide decision-making and (v) identify residents’ preferred options for specific medical emergencies. Control NHs continued their usual ACP processes. Co-primary outcomes were: (a) comprehensiveness of advance care planning, assessed using the Audit of Advance Care Planning, and (b) Comfort Assessment in Dying. Ten secondary outcomes were assessed. P-values were adjusted for all 12 outcomes using the false discovery rate method. Results The intervention resulted in 5.21-fold higher odds of respondents rating ACP comprehensiveness as being better (95% confidence interval [CI] 3.53, 7.61). Comfort in dying did not differ (difference = −0.61; 95% CI −2.2, 1.0). Among the secondary outcomes, antimicrobial use was significantly lower in intervention homes (rate ratio = 0.79, 95% CI 0.66, 0.94). Conclusions Superior comprehensiveness of the BABEL approach to ACP underscores the importance of allowing adequate time to address all important aspects of ACP and may reduce unwanted interventions towards the end of life.
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Affiliation(s)
- Allan Garland
- Department of Internal Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Heather Keller
- School of Public Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Patrick Quail
- Department of Family Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Veronique Boscart
- School of Health and Life Sciences, Conestoga College, Kitchener, Ontario, Canada
| | - Michelle Heyer
- School of Health and Life Sciences, Conestoga College, Kitchener, Ontario, Canada
| | - Clare Ramsey
- Department of Internal Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Vanessa Vucea
- School of Public Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Nora Choi
- Department of Internal Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Ikdip Bains
- School of Public Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Seema King
- Department of Family Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Tatiana Oshchepkova
- Department of Family Medicine, University of Calgary, Calgary, Alberta, Canada
| | | | - Brittany Kroetsch
- School of Public Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Jessica Steer
- Department of Internal Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - George Heckman
- School of Public Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
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Choi N, Garland A, Ramsey C, Steer J, Keller H, Heckman G, Vucea V, Bains I, Kroetsch B, Quail P, King S, Oshchepkova T, Kalashnikova T, Boscart V, Heyer M. Problems With Advance Care Planning Processes and Practices in Nursing Homes. J Am Med Dir Assoc 2020; 21:2012-2013. [PMID: 32826160 PMCID: PMC7434431 DOI: 10.1016/j.jamda.2020.07.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 07/04/2020] [Indexed: 11/15/2022]
Affiliation(s)
- Nora Choi
- University of Manitoba, Winnipeg, Manitoba, Canada
| | | | - Clare Ramsey
- University of Manitoba, Winnipeg, Manitoba, Canada
| | | | | | | | | | - Ikdip Bains
- University of Waterloo, Waterloo, Ontario, Canada
| | | | | | - Seema King
- University of Calgary, Calgary, Alberta, Canada
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Shkaruba N, Silkov A, Sennikova J, Sizikov A, Herzsog O, Dolgikh S, Mazurov V, Shulman J, Sizyakina L, Kalashnikova T, Kozlov V, Sennikov S. SAT0146 Single nucleotide polymorphisms in the TNF-α gene and efficacy of anticytokine therapy in patients with rheumatoid arthritis. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.3093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Abstract
Nucleosomes impose a block to transcription that can be overcome in vivo by remodeling complexes such as SNF/SWI and histone modification complexes such as SAGA. Mutations in the major core histones relieve transcriptional repression and bypass the requirement for SNF/SWI and SAGA. We have found that the variant histone H2A.Z regulates gene transcription, and deletion of the gene encoding H2A.Z strongly increases the requirement for SNF/SWI and SAGA. This synthetic genetic interaction is seen at the level of single genes and acts downstream of promoter nucleosome reorganization. H2A.Z is preferentially crosslinked in vivo to intergenic DNA at the PH05 and GAL1 loci, and this association changes with transcriptional activation. These results describe a novel pathway for regulating transcription using variant histones to modulate chromatin structure.
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MESH Headings
- Adenosine Triphosphatases
- Alleles
- Chromosomal Proteins, Non-Histone/genetics
- Chromosomal Proteins, Non-Histone/physiology
- DNA, Fungal/genetics
- DNA, Fungal/metabolism
- DNA, Intergenic/genetics
- DNA, Intergenic/metabolism
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/metabolism
- DNA-Binding Proteins/physiology
- Fungal Proteins/genetics
- Fungal Proteins/physiology
- Gene Deletion
- Gene Expression Regulation, Fungal
- Genes, Essential/genetics
- Genes, Fungal/genetics
- Genes, Fungal/physiology
- Histones/chemistry
- Histones/genetics
- Histones/metabolism
- Hot Temperature
- Macromolecular Substances
- Membrane Transport Proteins/genetics
- Molecular Conformation
- Nuclear Proteins
- Nucleosomes/chemistry
- Nucleosomes/genetics
- Nucleosomes/metabolism
- Phenotype
- Phosphate Transport Proteins
- Promoter Regions, Genetic/genetics
- Protein Binding
- Protein Kinases/genetics
- Protein Kinases/physiology
- Protein Subunits
- Recombinant Fusion Proteins
- Saccharomyces cerevisiae/cytology
- Saccharomyces cerevisiae/genetics
- Saccharomyces cerevisiae Proteins
- Suppression, Genetic/genetics
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Transcription, Genetic
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Affiliation(s)
- M S Santisteban
- Department of Microbiology and Cancer Center, University of Virginia, Charlottesville 22908, USA
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Abstract
Cse4p is a structural component of the core centromere of Saccharomyces cerevisiae and is a member of the conserved CENP-A family of specialized histone H3 variants. The histone H4 allele hhf1-20 confers defects in core centromere chromatin structure and mitotic chromosome transmission. We have proposed that Cse4p and histone H4 interact through their respective histone fold domains to assemble a nucleosome-like structure at centromeric DNA. To test this model, we targeted random mutations to the Cse4p histone fold domain and isolated three temperature-sensitive cse4 alleles in an unbiased genetic screen. Two of the cse4 alleles contain mutations at the Cse4p-H4 interface. One of these requires two widely separated mutations demonstrating long-range cooperative interactions in the structure. The third cse4 allele is mutated at its helix 2-helix 3 interface, a region required for homotypic H3 fold dimerization. Overexpression of wild-type Cse4p and histone H4 confer reciprocal allele-specific suppression of cse4 and hhf1 mutations, providing strong evidence for Cse4p-H4 protein interaction. Overexpression of histone H3 is dosage lethal in cse4 mutants, suggesting that histone H3 competes with Cse4p for histone H4 binding. However, the relative resistance of the Cse4p-H4 pathway to H3 interference argues that centromere chromatin assembly must be highly regulated.
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Affiliation(s)
- L Glowczewski
- Department of Microbiology and Cancer Center, University of Virginia, Charlottesville, Virginia 22908, USA
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