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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this...
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Updated: Aug 24, 2025

Genome-Wide CRISPR Screen for Unveiling Radiosensitive and Radioresistant Genes
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Genome-Wide CRISPR Screen for Unveiling Radiosensitive and Radioresistant Genes

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Advances in CRISPR therapeutics.

Michael Chavez1, Xinyi Chen1, Paul B Finn1

  • 1Department of Bioengineering, Stanford University, Stanford, CA, USA.

Nature Reviews. Nephrology
|October 25, 2022
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Summary
This summary is machine-generated.

This review examines how advanced genome-editing tools are evolving beyond simple gene disruption to address complex genetic diseases, offering potential cures for previously unmanageable conditions.

Keywords:
genome editinggene regulationmolecular medicineCas proteins

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Area of Science:

  • Molecular genetics and CRISPR therapeutics within biotechnology
  • Genomic engineering and translational medicine

Background:

The precise modification of mammalian genomes remains a significant challenge for modern medicine. Prior research has shown that prokaryotic proteins can induce targeted breaks within DNA strands. This discovery initiated a rapid expansion in genetic manipulation capabilities. However, simple gene disruption techniques often fail to address complex, multi-factorial disorders. Many human conditions involve intricate combinations of mutations across both coding and non-coding regions. That uncertainty drove the development of more sophisticated engineering strategies. No prior work had resolved the limitations of basic knockout approaches for diverse genomic architectures. This gap motivated the current synthesis of advanced molecular toolsets.

Purpose Of The Study:

The aim of this review is to analyze the evolution of genome engineering tools for therapeutic applications. Researchers sought to explain how the field has moved beyond simple gene knockout strategies. The study addresses the specific problem of managing complex genetic disorders characterized by multiple mutations. Authors intended to highlight the expansion of the CRISPR-Cas toolbox for diverse clinical needs. The motivation lies in the potential to treat conditions that were previously considered beyond the reach of genetic intervention. This work explores how precise modifications can be achieved in both coding and non-coding genomic regions. The review provides a clear perspective on the current state of epigenome engineering and its future promise. The investigation clarifies how these advancements facilitate the development of curative therapies for various human diseases.

Main Methods:

The review approach involves a comprehensive synthesis of current literature regarding genome engineering advancements. Investigators evaluated the transition from basic gene knockout techniques to complex, multi-functional editing systems. The analysis focuses on how natural and synthetic tools function within human cellular environments. Authors examined preclinical data alongside results from ongoing clinical trials to assess therapeutic progress. The study design emphasizes the expansion of the molecular toolbox for precise genetic and epigenetic modifications. Researchers synthesized information on targeting both coding sequences and non-coding genomic regions. This evaluation highlights the shift toward strategies capable of managing multi-factorial genetic disorders. The methodology provides a structured overview of how these innovations address previous limitations in the field.

Main Results:

Key findings from the literature demonstrate that RNA-guided proteins successfully create targeted breaks in mammalian genomes. Studies indicate that these systems effectively rescue disease phenotypes in both preclinical models and clinical trials. The data show that the expansion of the molecular toolbox allows for precise genetic changes beyond simple gene disruption. Evidence confirms that these tools can now modulate gene regulation through targeted epigenome engineering. Researchers report that these advancements enable the correction of errors within complex coding sequences. The findings suggest that targeting non-coding regions is feasible for managing intricate genetic variations. Results highlight that these diverse systems function reliably within human cells to achieve specific therapeutic outcomes. The literature confirms that these sophisticated strategies represent a significant improvement over earlier, less precise genetic methods.

Conclusions:

The authors propose that expanded CRISPR systems offer transformative potential for treating complex human diseases. These engineered tools enable precise modifications that extend far beyond traditional gene disruption methods. By targeting non-coding regions, researchers can now modulate gene regulation with unprecedented accuracy. This synthesis suggests that current advancements provide a pathway toward curative interventions for previously untreatable conditions. The evidence indicates that diverse Cas-based systems are becoming increasingly versatile for clinical applications. Future therapeutic strategies will likely rely on these sophisticated, multi-functional genome engineering platforms. The review highlights how these innovations address the limitations inherent in earlier, simpler genetic technologies. Ultimately, the integration of these tools represents a major shift in the landscape of genetic medicine.

The researchers propose that these systems function by utilizing RNA-guided proteins to induce specific breaks in DNA, which then triggers natural cellular repair pathways to correct or modify genetic sequences.

The authors highlight the inclusion of engineered Cas variants and diverse regulatory tools that allow for precise epigenome modulation, moving beyond the simple knockout capabilities of earlier systems.

The authors state that sophisticated engineering is necessary because most human genetic disorders involve complex combinations of mutations, deletions, and duplications that cannot be resolved by basic gene disruption alone.

The researchers describe how these systems target non-coding regions of the genome to modulate gene regulation, which is a critical role for addressing diseases that do not stem from simple coding errors.

The authors note that these technologies are currently being evaluated in preclinical studies and several clinical trials to determine their efficacy in rescuing disease phenotypes.

The researchers propose that the application of these technologies has the potential to lead to curative therapies for many conditions that were previously considered untreatable.