Why this matters now
Gene editing is tested for how CRISPR works, its applications (gene therapy, crops), India’s regulatory stance, and the ethics of editing the human germline — a high-yield biotech topic.
How CRISPR works
CRISPR-Cas9 is a molecular “cut-and-edit” tool adapted from a bacterial immune system. A guide RNA locates a target DNA sequence, and the Cas9 enzyme cuts it, allowing genes to be disabled, corrected or inserted. It is far cheaper, faster and more precise than earlier methods — its discoverers won the 2020 Nobel Prize in Chemistry.
Applications
- Medicine — gene therapy for sickle-cell anaemia, thalassaemia, cancers and genetic disorders;
- Agriculture — disease-resistant, climate-resilient, higher-yield crops (genome-edited, distinct from transgenic GM);
- Research and diagnostics.
India’s rules and the ethics debate
India allows research, and the regulator (the Department of Biotechnology / RCGM-GEAC) has eased rules for certain genome-edited crops (SDN-1/SDN-2, no foreign DNA). The major ethical concern is editing the human germline (“designer babies”) — heritable, irreversible changes — alongside safety, consent, equity and biosecurity. Most countries ban germline editing for reproduction.
UPSC angle
Know CRISPR-Cas9 (guide RNA + Cas9 cut, 2020 Nobel), applications (gene therapy for sickle-cell/thalassaemia, genome-edited crops), India’s eased crop rules (SDN-1/2), and the germline-editing ethics.
Frequently asked questions
What is CRISPR-Cas9?
A precise, low-cost gene-editing tool that uses a guide RNA to target DNA and the Cas9 enzyme to cut and edit it.
What are the applications of gene editing?
Gene therapy for genetic diseases and cancers, and developing disease-resistant, climate-resilient and higher-yield crops.
How are genome-edited crops different from GM crops?
Genome-edited crops (SDN-1/SDN-2) can carry no foreign DNA, unlike transgenic GM crops; India has eased their regulation.
What is the main ethical concern with gene editing?
Editing the human germline (“designer babies”) — heritable, irreversible changes — which most countries ban for reproduction.