From Gene Modification to Genome Editing: India’s Agricultural Revolution

Context:

India’s journey in crop biotechnology has been slow with traditional genetically modified (GM) crops, but genome editing (GE) is emerging as a game-changer. While GM crops introduce foreign genes, GE precisely edits a plant’s own genome, offering higher yields, better nutrition, and disease resistance without transgenic concerns.

Key Developments:

Limited Progress on GM Crops

• India’s genetically modified (GM) crop adoption has largely been restricted to Bt cotton.
• No new GM crop technology has been approved for commercialisation since 2006.

Emergence of Genome Editing (GE)

• Indian scientists are now making headway with genome-edited crops, supported by research initiatives and government funding.
• Notable trials include GE rice lines (Samba Mahsuri and MTU-1010) that show:
  • Up to 19% yield increase for one line.
  • Better adaptation to saline or alkaline soils.
• A GE mustard line is under multi-location testing and could be released by 2026.

How GE Works

• Uses CRISPR-Cas systems (Cas9/Cas12a) to precisely edit native plant genes.
• Example: Editing the Gn1a gene in rice reduces its activity → increases cytokinin → higher grain yield.
• GE plants can be transgene-free, meaning Cas proteins are removed in later generations.

Policy and Regulatory Support

• GE plants are exempt from strict biosafety regulations applied to GM crops, as they do not carry foreign DNA.
• Approvals are handled at the Institutional Biosafety Committee level, simplifying the process.
• The government has allocated significant funding to boost GE research through ICAR and other institutions.

Target Crops and Genes

• ICAR has identified 178 genes in 24 field crops and 43 genes in 16 horticultural crops for potential genome editing.
• GE aims to improve yield, quality, stress tolerance, and climate resilience across key agricultural and horticultural crops.

Domestic Innovation

• Indian scientists have developed a miniature genome editing tool using TnpB proteins, which is smaller, cheaper, and can bypass intellectual property limitations compared to standard CRISPR tools.

Strategic Significance

• GE allows higher productivity, nutritional improvement, and resilience while avoiding public resistance linked to GM crops.
• India could overcome the stagnation of the GM era, positioning itself as a leader in safe, next-generation crop biotechnology.

Genetically Modified (GM) Crops

• Definition: Organisms whose DNA has been altered by inserting foreign genes from other species.
• Method: Traditional genetic engineering (transgenic approach).
• Example: Bt cotton (gene from bacteria inserted to confer pest resistance).
• Regulation: Strict oversight; considered transgenic and often faces higher regulatory barriers.
• Impact: Introduces traits not naturally present in the plant’s gene pool.

Genome Editing (GE)

• Definition: Precise modification of an organism’s own DNA without necessarily introducing foreign genes.
• Method: Technologies like CRISPR-Cas9, TALENs, or ZFNs to add, delete, or replace specific genes.
• Example: Editing rice for drought tolerance by modifying its existing genes.
• Regulation: Often considered differently from GM crops; regulatory frameworks are evolving.
• Impact: Can achieve desired traits while maintaining the species’ natural gene pool.

Key Difference: GM crops usually involve foreign DNA, while genome editing modifies existing DNA with precision.