scholarly journals Update of Regulatory Options of New Breeding Techniques and Biosafety Approaches among Selected Countries: A Review

2020 ◽  
pp. 18-35
Author(s):  
Silas Obukosia ◽  
Olalekan Akinbo ◽  
Woldeyesus Sinebo ◽  
Moussa Savadogo ◽  
Samuel Timpo ◽  
...  
Keyword(s):  
Genome Editing ◽  
Genetically Modified Organisms ◽  
Zinc Finger Nucleases ◽  
Intermediate Step ◽  
Homing Endonucleases ◽  
Transcription Activator ◽  
Associated Proteins ◽  
Genomic Editing ◽  
New Breeding Techniques ◽  
Breeding Techniques

A new set of breeding techniques, referred to as New Breeding Techniques developed in the last two decades have potential for enhancing improved productivity in crop and animal breeding globally. These include site directed nucleases based genomic editing procedures-CRISPR and Cas associated proteins, Zinc Finger Nucleases, Meganucleases/Homing Endonucleases and Transcription- Activator Like-Effector Nucleases for genome editing and other technologies including- Oligonucleotide-Directed Mutagenesis, Cisgenesis and intragenesis, RNA-Dependent DNA methylation; Transgrafting, Agroinfiltration, Reverse breeding. There are ongoing global debates on whether the processes of and products emerging from these technologies should be regulated as genetically modified organisms or approved as conventional products. Decisions on whether to regulate as GMOs are based both on understanding of the molecular basis of their development and if the GMO intermediate step was used. For example- cisgenesis, can be developed using Agrobacterium tumefaciens methods of transformation, a process used by GMO but if the selection is properly conducted the intermediate GMO elements will be eliminated and the final product will be identical to the conventionally developed crops. Others like Site Directed Nuclease 3 are regulated as GMOs in countries such as United State of America, Canada, European Union, Argentina, Australia. Progress in genome editing research, testing of genome edited bacterial blight resistant rice, development of Guidelines for regulating new breeding techniques or genome editing in Africa is also covered with special reference to South Africa, Kenya and Nigeria. Science- and evidence-based approach to regulation of new breeding techniques among regulators and policy makers should be strongly supported.

Concepts of Molecular Plant Breeding and Genome Editing

2021 ◽  
pp. 1-15
Keyword(s):  
Plant Breeding ◽  
Genome Editing ◽  
Genetic Linkage ◽  
Selection Process ◽  
Crop Improvement ◽  
Zinc Finger Nucleases ◽  
Induced Mutations ◽  
Transcription Activator ◽  
Targeted Gene Editing ◽  
Breeding Techniques

Traditional plant breeding depends on spontaneous and induced mutations available in the crop plants. Such mutations are rare and occur randomly. By contrast, molecular breeding and genome editing are advanced breeding techniques that can enhance the selection process and produce precisely targeted modifications in any crop. Identification of molecular markers, based on SSRs and SNPs, and the availability of high-throughput (HTP) genotyping platforms have accelerated the process of generating dense genetic linkage maps and thereby enhanced application of marker-assisted breeding for crop improvement. Advanced molecular biology techniques that facilitate precise, efficient, and targeted modifications at genomic loci are termed as “genome editing.” The genome editing tools include “zinc-finger nucleases (ZNFs),” “transcription activator-like effector nucleases (TALENs),” oligonucleotide-directed mutagenesis (ODM), and “clustered regularly interspersed short palindromic repeats (CRISPER/Cas) system,” which can be used for targeted gene editing. Concepts of molecular plant breeding and genome editing systems are presented in this chapter.

Advances in the generation of insertion-based genome edits in plants

2021 ◽  
pp. 63-96
Author(s):  
Baike Wang ◽  
◽  
Juan Wang ◽  
Shaoyong Huang ◽  
Yaping Tang ◽  
...  
Keyword(s):  
Genome Editing ◽  
Crop Improvement ◽  
Zinc Finger Nucleases ◽  
Transcription Activator ◽  
Tremendous Progress ◽  
Recent Developments ◽  
Recent Trends ◽  
Crop Germplasm ◽  
Breeding Techniques ◽  
Tools And Methods

Tremendous progress has been achieved in the field of gene editing in plants, such as with the use of zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs), and clustered regularly interspaced short palindromic repeats (CRISPR). Because of the potential advantages associated with mutant creation and crop germplasm innovation, genome editing technology has been rapidly developed and widely used in crop improvement in recent years. In this review, we aim to document some of the important recent developments and applications of genome-editing tools, especially with respect to gene knock-ins. We introduce the mechanism underlying knock-ins and different outcomes of insertion. We also discuss genome editing tools and methods developed to improve insertion efficiencies. Additionally, we review the recent trends in genetic editing biotechnologies; several strategies are being developed to further improve the efficiency of plant gene knock-ins. Undoubtedly, CRISPR/Cas technology will boost the development of new plant breeding techniques tremendously.

scholarly journals Delivery Approaches for Therapeutic Genome Editing and Challenges

Genes ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1113 ◽  
Author(s):  
Ilayda Ates ◽  
Tanner Rathbone ◽  
Callie Stuart ◽  
P. Hudson Bridges ◽  
Renee N. Cottle
Keyword(s):  
Clinical Trials ◽  
Genome Editing ◽  
Zinc Finger ◽  
Gene Editing ◽  
Zinc Finger Nucleases ◽  
Systemic Delivery ◽  
Transcription Activator ◽  
Therapeutic Gene ◽  
Major Barrier ◽  
Associated Proteins

Impressive therapeutic advances have been possible through the advent of zinc-finger nucleases and transcription activator-like effector nucleases. However, discovery of the more efficient and highly tailorable clustered regularly interspaced short palindromic repeats (CRISPR) and associated proteins (Cas9) has provided unprecedented gene-editing capabilities for treatment of various inherited and acquired diseases. Despite recent clinical trials, a major barrier for therapeutic gene editing is the absence of safe and effective methods for local and systemic delivery of gene-editing reagents. In this review, we elaborate on the challenges and provide practical considerations for improving gene editing. Specifically, we highlight issues associated with delivery of gene-editing tools into clinically relevant cells.

Genome modifications in crops employing engineered nucleases

2016 ◽  
Author(s):  
Harshvardhan N. Zala ◽  
Tejas C. Bosamia ◽  
Yogesh M. Shukla ◽  
Sushil Kumar ◽  
Kalyani S. Kulkarni
Keyword(s):  
Genetically Modified Organisms ◽  
Crop Improvement ◽  
Zinc Finger Nucleases ◽  
World Population ◽  
Homing Endonucleases ◽  
Induced Mutations ◽  
Transcription Activator ◽  
Random Mutation ◽  
Engineered Nucleases ◽  
Genome Modifications

Crop improvement aims at substantial enhancements in the quality, yield and stress resistance of crops to meet the increasing food demand of growing world population. Targeted genome modification of crop plants is one of the ways to achieve this. This technology supersedes conventional methods limited by the inefficiencies of random mutation, accuracy and stability. It employs site-directed nucleases to create breaks at specific points in the target genome for desired alteration with high-precision. There are four nucleases namely, LAGLIDADG homing endonucleases (LHEs), zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs) and clustered regularly interspaced short palindromic repeats (CRISPR) nucleases out of which three, ZFNs, TALENs and CRISPR have been highly studied and evaluated in various crop systems for economic trait. Potency of engineered nucleases lies in their efficacy to bring desired modification in diploid as well as in polyploid plant genomes. Modifications using genome editing are similar to natural or conventional method like induced mutations and are foreseen to waive regulatory actions as applicable to genetically modified organisms. This review seeks to emphasize on the employment of engineered nucleases in various crops plants till date.

scholarly journals CRISPR/Cas Derivatives as Novel Gene Modulating Tools: Possibilities and In Vivo Applications

2020 ◽  
Vol 21 (9) ◽  
pp. 3038 ◽  
Author(s):  
Xingbo Xu ◽  
Melanie S. Hulshoff ◽  
Xiaoying Tan ◽  
Michael Zeisberg ◽  
Elisabeth M. Zeisberg
Keyword(s):  
Transcriptional Activation ◽  
Gene Activation ◽  
Zinc Finger Nucleases ◽  
Homing Endonucleases ◽  
Transcription Activator ◽  
Base Editing ◽  
Advantages And Disadvantages ◽  
Associated Proteins

The field of genome editing started with the discovery of meganucleases (e.g., the LAGLIDADG family of homing endonucleases) in yeast. After the discovery of transcription activator-like effector nucleases and zinc finger nucleases, the recently discovered clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR associated proteins (Cas) system has opened a new window of applications in the field of gene editing. Here, we review different Cas proteins and their corresponding features including advantages and disadvantages, and we provide an overview of the different endonuclease-deficient Cas protein (dCas) derivatives. These dCas derivatives consist of an endonuclease-deficient Cas9 which can be fused to different effector domains to perform distinct in vitro applications such as tracking, transcriptional activation and repression, as well as base editing. Finally, we review the in vivo applications of these dCas derivatives and discuss their potential to perform gene activation and repression in vivo, as well as their potential future use in human therapy.

scholarly journals Evolution and Application of Genome Editing Techniques for Achieving Food and Nutritional Security

2021 ◽  
Vol 22 (11) ◽  
pp. 5585
Author(s):  
Sajid Fiaz ◽  
Sunny Ahmar ◽  
Sajjad Saeed ◽  
Aamir Riaz ◽  
Freddy Mora-Poblete ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Food Security ◽  
Plant Breeding ◽  
Genome Editing ◽  
Crop Improvement ◽  
Hybrid Seed Production ◽  
Biotic And Abiotic Stress ◽  
Transcription Activator ◽  
Protein System ◽  
Breeding Techniques

A world with zero hunger is possible only through a sustainable increase in food production and distribution and the elimination of poverty. Scientific, logistical, and humanitarian approaches must be employed simultaneously to ensure food security, starting with farmers and breeders and extending to policy makers and governments. The current agricultural production system is facing the challenge of sustainably increasing grain quality and yield and enhancing resistance to biotic and abiotic stress under the intensifying pressure of climate change. Under present circumstances, conventional breeding techniques are not sufficient. Innovation in plant breeding is critical in managing agricultural challenges and achieving sustainable crop production. Novel plant breeding techniques, involving a series of developments from genome editing techniques to speed breeding and the integration of omics technology, offer relevant, versatile, cost-effective, and less time-consuming ways of achieving precision in plant breeding. Opportunities to edit agriculturally significant genes now exist as a result of new genome editing techniques. These range from random (physical and chemical mutagens) to non-random meganucleases (MegaN), zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs), clustered regularly interspaced short palindromic repeats (CRISPR)/associated protein system 9 (CRISPR/Cas9), the CRISPR system from Prevotella and Francisella1 (Cpf1), base editing (BE), and prime editing (PE). Genome editing techniques that promote crop improvement through hybrid seed production, induced apomixis, and resistance to biotic and abiotic stress are prioritized when selecting for genetic gain in a restricted timeframe. The novel CRISPR-associated protein system 9 variants, namely BE and PE, can generate transgene-free plants with more frequency and are therefore being used for knocking out of genes of interest. We provide a comprehensive review of the evolution of genome editing technologies, especially the application of the third-generation genome editing technologies to achieve various plant breeding objectives within the regulatory regimes adopted by various countries. Future development and the optimization of forward and reverse genetics to achieve food security are evaluated.

scholarly journals Pathways of Conflict: Lessons from the Cultivation of MON810 in Germany in 2005–2008 for Emerging Conflicts over New Breeding Techniques

2019 ◽  
Vol 12 (1) ◽  
pp. 144
Author(s):  
Beate Friedrich
Keyword(s):  
Political Ecology ◽  
Genetically Modified Organisms ◽  
Qualitative Interviews ◽  
Rural Landscape ◽  
Commercial Application ◽  
The United Kingdom ◽  
Regulatory Frameworks ◽  
Maize Mon810 ◽  
New Breeding Techniques ◽  
Breeding Techniques

The paper uses qualitative interviews and document analysis to examine conflicts over plant and animal breeding techniques from the perspectives of Social and Political Ecology. It asks how past conflicts over genetically modified organisms (GMOs) can inform understandings of possible trajectories of emerging conflicts over new breeding techniques (NBTs) such as CRISPR/Cas genome editing. Case studies of conflicts in three areas where the transgenic maize MON810 was cultivated in Germany from 2005–2008 show that the escalation of conflict coincided with the first tangible presence of these already controversial organisms in the rural landscape. Location-specific interlinkages between discursive and material dimensions gave rise to different pathways of conflict in the three areas studied. These empirical results inform the analysis of emerging conflicts over NBTs in Germany and the United Kingdom. The future of NBTs in both countries is still open, and the divergence of regulatory frameworks in Europe could lead to the development of ‘NBT hotspots’ located in particular European countries, provoking an escalation of conflict in areas where commercial application takes place. The paper concludes by examining the potential for a politicization of future conflicts to encompass wider issues related to the transformation of agricultural systems towards sustainability.

scholarly journals Progress and Challenges in the Improvement of Ornamental Plants by Genome Editing

Plants ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 687 ◽  
Author(s):  
Chang Ho Ahn ◽  
Mummadireddy Ramya ◽  
Hye Ryun An ◽  
Pil Man Park ◽  
Yae-Jin Kim ◽  
...  
Keyword(s):  
Genome Editing ◽  
Gene Editing ◽  
Genetically Modified Organisms ◽  
Ornamental Plants ◽  
Safety Evaluation ◽  
Evaluation Process ◽  
Vase Life ◽  
Transcription Activator ◽  
A Genome ◽  
Dna Specificity

Biotechnological approaches have been used to modify the floral color, size, and fragrance of ornamental plants, as well as to increase disease resistance and vase life. Together with the advancement of whole genome sequencing technologies, new plant breeding techniques have rapidly emerged in recent years. Compared to the early versions of gene editing tools, such as meganucleases (MNs), zinc fingers (ZFNs), and transcription activator-like effector nucleases (TALENs), clustered regularly interspaced short palindromic repeat (CRISPR) is capable of altering a genome more efficiently and with higher accuracy. Most recently, new CRISPR systems, including base editors and prime editors, confer reduced off-target activity with improved DNA specificity and an expanded targeting scope. However, there are still controversial issues worldwide for the recognition of genome-edited plants, including whether genome-edited plants are genetically modified organisms and require a safety evaluation process. In the current review, we briefly summarize the current progress in gene editing systems and also introduce successful/representative cases of the CRISPR system application for the improvement of ornamental plants with desirable traits. Furthermore, potential challenges and future prospects in the use of genome-editing tools for ornamental plants are also discussed.

Genome Editing Toolbox

Blood ◽  
2014 ◽  
Vol 124 (21) ◽  
pp. SCI-11-SCI-11
Author(s):  
Andrew M. Scharenberg
Keyword(s):  
Genome Engineering ◽  
Gene Knockout ◽  
Zinc Finger Nucleases ◽  
Practical Implementation ◽  
Homing Endonucleases ◽  
Gene Repair ◽  
Dna Breaks ◽  
Transcription Activator ◽  
Advisory Committees ◽  
Core Technology

Abstract Nucleases capable of making targeted breaks in genomic DNA are a core technology required for genome engineering, an emerging field of technology for making precise alterations in cellular genomes. Over the past ten years, four major platforms have emerged for generation of nucleases able to make targeted DNA breaks with a high degree of efficiency and specificity: homing endonucleases, zinc finger nucleases, transcription activator-like (TAL) effector nucleases, and RNA-guided nucleases. This talk will cover the biochemistry and platform-specific attributes of each type of nuclease, along with evolution/improvements in nucleases and related technologies and aspects of the practical implementation of nuclease technology for gene knockout and gene repair in primary hematopoietic cells. Disclosures Scharenberg: Pregenen Inc.: Equity Ownership, Membership on an entity's Board of Directors or advisory committees; Cellectis therapeutics: Consultancy.

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