India's Twin Paradox: Abundant Resource, Absent Research

Area of Science:

• Genetics and Epidemiology
• Public Health
• Biomedical Research Infrastructure

Background:

• India has a high twin birth rate (30,000-40,000 pairs annually) due to assisted reproductive technologies and delayed childbearing.
• Existing twin registries in other countries have significantly advanced understanding of disease heritability and gene-environment interactions.
• India's vast population, genetic diversity, and ongoing environmental changes present a unique, underutilized research opportunity.

Purpose of the Study:

• To highlight the underutilization of India's twin population as a research resource.
• To advocate for the establishment of a National Twin Registry in India.
• To emphasize the potential of twin studies in understanding complex diseases within India's unique context.

Main Methods:

• Leveraging India's genetic heterogeneity and rapid environmental transitions for natural experiments.
• Proposing a federated model for a National Twin Registry, integrating existing birth records and digital health infrastructure (e.g., Ayushman Bharat Digital Mission).
• Suggesting pilot registries in states with strong health systems for phased national expansion.

Main Results:

• Twin studies enable disentangling genetic and environmental factors in diseases.
• India's diverse population groups and environmental shifts offer unparalleled opportunities for studying conditions like type 2 diabetes, cardiovascular disease, and neuropsychiatric disorders.
• A National Twin Registry can be established with modest investment, yielding broad health insights.

Conclusions:

• Establishing a National Twin Registry is crucial for India to transition from a research subject pool to a research leader.
• Such a registry will empower Indian researchers to address national health priorities and advance precision medicine.
• International collaborations can accelerate registry development while ensuring data sovereignty.