RNA Editing
Kartavya Desk Staff
Syllabus: Science and Technology
Source: TH
Context: Recently, companies like Wave Life Sciences have made significant strides in RNA editing, with the first clinical application of this technology.
About RNA Editing:
• Definition: RNA editing involves making precise changes to RNA molecules, which carry instructions from DNA to produce proteins. This process allows scientists to correct errors in RNA before they are translated into proteins.
• Mechanism: One method uses enzymes like adenosine deaminase acting on RNA (ADAR) to convert adenosine to inosine, which mimics guanosine, restoring normal protein function.
• Guide RNA (gRNA): gRNA directs ADAR enzymes to specific mRNA regions to correct mutations linked to genetic disorders.
Difference Between RNA and DNA Editing:
• Permanency: DNA editing makes permanent changes to the genome; RNA editing makes temporary changes, reducing long-term risk.
• Safety: DNA editing uses proteins from bacteria, which may cause immune reactions; RNA editing utilizes ADAR enzymes already present in the human body, lowering immune risks.
• Flexibility: RNA editing allows effects to fade over time, enabling doctors to stop treatment if side effects arise.
Challenges in RNA Editing:
• Specificity: ADAR enzymes may cause unintended edits in non-targeted mRNA regions, which could lead to side effects.
• Transient Effects: The temporary nature of RNA edits requires repeated treatments for sustained benefits.
• Delivery Limitations: Current delivery methods, like lipid nanoparticles, struggle with transporting large molecules, limiting effectiveness.
Applications in Various Fields:
• Genetic Disorders: Treats single-point mutations in conditions like Huntington’s disease, Duchenne muscular dystrophy, and alpha-1 antitrypsin deficiency.
• Neurological Conditions: Companies are exploring RNA editing for diseases like Parkinson’s.
• Oncology: Rznomics’ trials focus on using RNA editing to regulate protein production related to liver cancer.
• Ophthalmology: Treating ABCA4 retinopathy, which is caused by mutations affecting protein expression in the eye.
Conclusion:
RNA editing offers a promising, flexible approach to treating genetic disorders with fewer risks than DNA editing. As clinical applications expand, RNA editing is poised to become a vital tool in precision medicine. Ongoing research and collaboration are key to unlocking its full potential.
Insta Links:
• Gene-editing
• With reference to agriculture in India, how can the technique of ‘genome sequencing’, often seen in the news, be used in the immediate future? (UPSC-2017)
• Genome sequencing can be used to identify genetic markers for disease resistance and drought tolerance in various crop plants.
• This technique helps in reducing the time required to develop new varieties of crop plants.
• It can be used to decipher the host-pathogen relationships in crops.
Select the correct answer using the code given below:
• 2 and 3 only
• 1 and 3 only
• 1, 2 and 3
Answer: d)