17 Feb 2026·Source: The Hindu

4 min

Science & TechnologyNEWS

Genome Editing Strategy Offers Hope for Treating Genetic Disorders

New research explores a genome-editing approach to treat multiple genetic disorders.

Photo by Trnava University

A recent study in Nature reveals a potential method to address many genetic disorders caused by nonsense mutations using a single genome-editing strategy. Researchers from the Broad Institute, Harvard University, and the University of Minnesota have developed Prime-Editing-mediated Readthrough of premature Termination codons (PERT). This reprograms one of the cell’s own genes into a tool to override premature stop signals, allowing the cell to ignore the faulty instruction and complete the protein.

The researchers engineered thousands of variants of four tRNA by adjusting their DNA sequences and by making small changes to the tRNA structure itself. In cultured human cells, this combination had 60-80% editing efficiency. In the Hurler syndrome mouse model, PERT restored 1.7-7% of normal enzyme activity in the brain, heart, and liver.

Treated mice also showed better cellular pathology and no signs of toxicity.

Key Facts

PERT reprograms a cell’s genes to override premature stop signals.

The researchers engineered thousands of variants of four tRNAs to improve their effectiveness.

PERT restored enzyme activity in cell models of Batten and Tay-Sachs diseases.

In Niemann-Pick C1 models, cells produced measurable amounts of full-length NPC1 protein.

In the Hurler syndrome mouse model, PERT restored 1.7-7% of normal enzyme activity in the brain, heart, and liver.

UPSC Exam Angles

GS Paper 3: Science and Technology - Developments and their applications and effects in everyday life.

Ethical considerations related to gene editing technologies.

Potential for applications in agriculture and human health.

In Simple Words

Imagine our bodies have instruction manuals (DNA) to make proteins. Sometimes, there's a typo (nonsense mutation) that tells the body to stop making a protein too early. This new method, PERT, is like a 'find and replace' tool that fixes the typo, so the body can make the complete protein.

India Angle

In India, many people suffer from genetic disorders, and treatments can be expensive and hard to access. If PERT becomes a viable treatment, it could offer a more affordable and accessible way to treat multiple genetic diseases with a single approach.

For Instance

Think of it like fixing a wrong pin code on an address label. Instead of reprinting the whole label, you just correct the pin code so the letter reaches the right place. PERT corrects the 'stop' signal so the protein reaches its destination.

This matters because it could lead to treatments for many genetic diseases that currently have no cure. It could improve the quality of life for many people and reduce the burden on healthcare systems.

PERT: Fixing genetic typos to make complete proteins.

Visual Insights

PERT Genome Editing Efficiency and Enzyme Restoration

Key statistics from the study on PERT genome editing for genetic disorders.

Editing Efficiency in Cultured Human Cells: 60-80%
Normal Enzyme Activity Restored in Hurler Syndrome Mouse Model: 1.7-7%

More Information

Background

The field of gene editing has advanced significantly in recent years, offering potential treatments for genetic disorders. Traditional gene editing techniques like CRISPR-Cas9 have revolutionized the ability to target and modify specific DNA sequences. However, these methods often involve cutting both strands of DNA, which can lead to unintended consequences such as off-target effects and cellular toxicity. Newer approaches aim to improve precision and reduce these risks. Nonsense mutations, which cause premature stop signals in protein synthesis, are responsible for a significant portion of genetic diseases. These mutations lead to truncated and non-functional proteins. Overriding these premature stop signals has been a long-standing goal in the development of therapies for such diseases. The development of Prime-Editing-mediated Readthrough (PERT) represents a novel approach to address these mutations by reprogramming the cell's own genes to bypass the faulty instructions. Transfer RNA (tRNA) plays a crucial role in protein synthesis by delivering amino acids to the ribosome based on the mRNA sequence. Modifying tRNA to recognize and suppress premature stop codons is a strategy to restore protein production. The PERT technique leverages this principle by engineering tRNA variants that can effectively read through these stop signals, allowing the cell to complete the protein synthesis process.

Latest Developments

Recent advancements in gene therapy and genome editing have focused on improving delivery methods and reducing off-target effects. Clinical trials using CRISPR-Cas9 for various genetic disorders have shown promising results, but also highlighted the challenges of ensuring long-term efficacy and safety. Researchers are exploring alternative editing tools, such as base editing and prime editing, to achieve more precise and controlled modifications of the genome. Regulatory agencies like the FDA are actively working on establishing guidelines and frameworks for the development and approval of gene therapies. These guidelines address key aspects such as preclinical testing, clinical trial design, and long-term monitoring of patients. The ethical considerations surrounding gene editing, including issues of accessibility, equity, and potential misuse, are also being actively debated and discussed by policymakers and the scientific community. Looking ahead, the field of genome editing is expected to continue to evolve rapidly, with ongoing research focused on developing more efficient, specific, and safe editing tools. The potential for personalized medicine, where treatments are tailored to an individual's unique genetic makeup, is a major driving force behind these advancements. The integration of artificial intelligence and machine learning is also expected to play a significant role in accelerating the discovery and development of new gene editing therapies.

Frequently Asked Questions

1. What is PERT and how does it work in the context of genome editing?

PERT (Prime-Editing-mediated Readthrough of premature Termination codons) is a genome-editing strategy that reprograms a cell’s genes to override premature stop signals. This allows the cell to ignore faulty instructions and complete the protein, potentially treating genetic disorders caused by nonsense mutations.

2. For UPSC Prelims, what key facts should I remember about PERT and its applications?

PERT reprograms a cell's genes to override premature stop signals. It has shown promise in restoring enzyme activity in cell models of Batten and Tay-Sachs diseases. In a Hurler syndrome mouse model, PERT restored some normal enzyme activity in the brain, heart, and liver.

Exam Tip

Remember PERT is related to prime editing and tRNA, not CRISPR-Cas9.

3. How does PERT differ from traditional gene editing techniques like CRISPR-Cas9?

Traditional gene editing techniques like CRISPR-Cas9 often involve cutting both strands of DNA, which can lead to unintended consequences. PERT, on the other hand, reprograms the cell's own genes to override premature stop signals without necessarily cutting both DNA strands, potentially reducing off-target effects.

4. What are the potential ethical considerations associated with using PERT for treating genetic disorders?

While the provided text does not explicitly address ethical considerations, the use of genome editing technologies like PERT raises questions about long-term safety, potential off-target effects, and equitable access to treatment. Further research and careful regulation are needed to address these concerns.

5. Why is PERT in the news recently?

PERT is in the news due to a recent study published in Nature that reveals its potential as a genome-editing strategy to address many genetic disorders caused by nonsense mutations. The research demonstrates the effectiveness of PERT in restoring enzyme activity in cell and animal models.

6. What is the role of tRNA in the PERT genome editing strategy?

In PERT, researchers engineered thousands of variants of four tRNA molecules by adjusting their DNA sequences and making small changes to the tRNA structure itself. These modified tRNAs are used to override premature stop signals during protein synthesis, allowing the cell to produce a full-length, functional protein.

7. How effective was PERT in the Hurler syndrome mouse model, and what organs showed improvement?

In the Hurler syndrome mouse model, PERT restored 1.7-7% of normal enzyme activity. Improvements were observed in the brain, heart, and liver of the mice.

8. What are the implications of PERT for treating genetic disorders caused by nonsense mutations?

Nonsense mutations account for about a quarter of all known disease-causing genetic changes. PERT offers a potential method to address many of these disorders using a single genome-editing strategy, which could simplify treatment development.

9. What are the next steps in the development of PERT as a therapeutic strategy?

Further research is needed to optimize PERT's efficiency and specificity, as well as to assess its long-term safety and efficacy in animal models and eventually in human clinical trials. Improving delivery methods and reducing potential off-target effects are also crucial.

10. Who are the key researchers involved in the development of PERT?

Debojyoti Chakraborty and Manjeera Gowravaram are key personalities involved in the research and development of PERT.

Practice Questions (MCQs)

1. Consider the following statements regarding Prime-Editing-mediated Readthrough (PERT): 1. PERT reprograms a cell’s genes to override premature stop signals in protein synthesis. 2. PERT involves engineering variants of messenger RNA (mRNA) to correct genetic mutations. 3. In a Hurler syndrome mouse model, PERT restored between 50-80% of normal enzyme activity. Which of the statements given above is/are correct?

A.1 only
B.2 only
C.1 and 3 only
D.1, 2 and 3

Show Answer

Answer: A

Statement 1 is CORRECT: PERT reprograms a cell’s genes to override premature stop signals, allowing the cell to complete protein synthesis. Statement 2 is INCORRECT: PERT involves engineering variants of transfer RNA (tRNA), not mRNA. Statement 3 is INCORRECT: In the Hurler syndrome mouse model, PERT restored 1.7-7% of normal enzyme activity, not 50-80%.

2. In the context of genome editing technologies, what is the primary function of Transfer RNA (tRNA) in the PERT system?

A.To cleave DNA at specific target sites.
B.To deliver amino acids to the ribosome, overriding premature stop codons.
C.To introduce mutations into the DNA sequence.
D.To repair double-strand breaks in the DNA.

Show Answer

Answer: B

The primary function of tRNA in the PERT system is to deliver amino acids to the ribosome, overriding premature stop codons. This allows the cell to complete protein synthesis despite the presence of nonsense mutations.

3. Which of the following statements best describes the significance of the study published in Nature regarding the PERT genome editing strategy?

A.It introduces a new method for creating induced pluripotent stem cells.
B.It offers a potential method to address genetic disorders caused by nonsense mutations using a single genome-editing strategy.
C.It provides a comprehensive analysis of the human microbiome.
D.It details a novel approach for enhancing photosynthesis in plants.

Show Answer

Answer: B

The study in Nature reveals a potential method to address many genetic disorders caused by nonsense mutations using a single genome-editing strategy, Prime-Editing-mediated Readthrough of premature Termination codons (PERT).