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Related Concept Videos

Gene Therapy00:59

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Gene therapy is a technique where a gene is inserted into a person’s cells to prevent or treat a serious disease. The added gene may be a healthy version of the gene that is mutated in the patient, or it could be a different gene that inactivates or compensates for the patient’s disease-causing gene. For example, in patients with severe combined immunodeficiency (SCID) due to a mutation in the gene for the enzyme adenosine deaminase, a functioning version of the gene can be...
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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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Related Experiment Video

Updated: Jan 8, 2026

Non-Viral Engineering of Primary Human T Cells via Homology-Mediated End-Joining Targeted Integration of Large DNA Templates
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Programmable large-cargo integration: Overcoming size constraints for next-generation gene therapy.

Lifang Yu1, Mario Andrea Marchisio2

  • 1School of Chemistry and Chemical Engineering, Huangshan University, Huangshan, 245041, PR China.

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|December 24, 2025
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Summary

New genome editing tools like base and prime editors enable precise DNA modifications. This review highlights three advanced systems for efficiently inserting large DNA fragments (>1 kb) to overcome current limitations in gene therapy.

Keywords:
CASTsClinical therapyLarge DNA insertionPE-integrasenCas9-R2

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Base and prime editors offer precise genome editing without double-strand breaks (DSBs).
  • These tools facilitate precise point mutations, insertions, deletions, and substitutions.
  • Current limitations exist in efficiently inserting large DNA fragments (>1 kb) for correcting complex genetic mutations.

Purpose of the Study:

  • To review novel strategies for efficient large DNA cargo insertion (>1 kb).
  • To examine the applications, advantages, and limitations of these systems in bacterial and mammalian contexts.
  • To identify persistent challenges and future research directions in large DNA insertion technologies.

Main Methods:

  • Review of three recently developed strategies for large DNA insertion: CRISPR-associated Tn7-like transposases (CASTs), PE-integrase systems, and R2 retrotransposon fusions (nCas9-R2).
  • Analysis of system applications in both bacterial and mammalian systems.
  • Discussion of comparative advantages and current limitations of each system.

Main Results:

  • CASTs, PE-integrase systems, and nCas9-R2 fusions demonstrate potential for efficient large DNA cargo insertion (>1 kb).
  • These systems show applicability in both bacterial and mammalian cellular contexts.
  • Each system presents unique advantages and limitations regarding efficiency, specificity, and cargo size.

Conclusions:

  • Advanced genome editing systems are emerging to enable efficient large DNA fragment insertion.
  • These technologies hold promise for advancing gene therapies and personalized genomic medicine by overcoming current limitations.
  • Further research is needed to address persistent challenges and optimize these systems for broader clinical applications.