Cited by 478CRISPR and Genetic EngineeringRNA regulation and diseaseRNA Interference and Gene Delivery

Mechanism and Applications of CRISPR/Cas-9-Mediated Genome Editing

Open access
Mengstie, Misganaw Asmamaw, Wondimu, Belay Zawdie·2021·Biologics: Targets and Therapy

Abstract

Clustered regularly interspaced short palindromic repeat (CRISPR) and their associated protein (Cas-9) is the most effective, efficient, and accurate method of genome editing tool in all living cells and utilized in many applied disciplines. Guide RNA (gRNA) and CRISPR-associated (Cas-9) proteins are the two essential components in CRISPR/Cas-9 system. The mechanism of CRISPR/Cas-9 genome editing contains three steps, recognition, cleavage, and repair. The designed sgRNA recognizes the target sequence in the gene of interest through a complementary base pair. While the Cas-9 nuclease makes double-stranded breaks at a site 3 base pair upstream to protospacer adjacent motif, then the double-stranded break is repaired by either non-homologous end joining or homology-directed repair cellular mechanisms. The CRISPR/Cas-9 genome-editing tool has a wide number of applications in many areas including medicine, agriculture, and biotechnology. In agriculture, it could help in the design of new grains to improve their nutritional value. In medicine, it is being investigated for cancers, HIV, and gene therapy such as sickle cell disease, cystic fibrosis, and Duchenne muscular dystrophy. The technology is also being utilized in the regulation of specific genes through the advanced modification of Cas-9 protein. However, immunogenicity, effective delivery systems, off-target effect, and ethical issues have been the major barriers to extend the technology in clinical applications. Although CRISPR/Cas-9 becomes a new era in molecular biology and has countless roles ranging from basic molecular researches to clinical applications, there are still challenges to rub in the practical applications and various improvements are needed to overcome obstacles.

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Research works printed but not linked: 5

  1. Ibrahim, 2019, Biomed Pharm Sci, 2, 1
  2. Nishimasu, 2017, Cell, 176, 139
  3. Shao, 2016, Sci Press Zool Res, 37, 1
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  5. Ali, 2021, J RNA Genomics, 17, 665

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Authors
Mengstie, M. A., & Wondimu, B. Z.
Affiliations
  • Debre Tabor University (ET)
  • Jimma University (ET)
Corresponding author
Mengstie, Misganaw Asmamaw
Venue
Biologics: Targets and Therapy
Published
2021-08
Volume
Volume 15
Pages
353-361
ISSN
  • 1177-5475 (ISSN-L)
  • 1177-5491
OpenAlex
W3194214711
Cited by
478
References
83
Citations by year
2026: 74 · 2025: 164 · 2024: 140 · 2023: 69 · 2022: 29 · 2021: 2
FWCI
6.29
Type
journal article
Language
en
Open access
Locations
  • Biologics (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
Keywords
genome editing, guide RNA, protospacer adjacent motif, DNA double-strand break repair, non-homologous end joining, homology-directed repair, gene therapy, sickle cell disease, cystic fibrosis, Duchenne muscular dystrophy, HIV, off-target effects, immunogenicity, gene delivery

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