For decades, much of what the world knew about human genetics was built from datasets that scarcely reflected the diversity of South Asia. Yet one of the most significant pieces of the human story may have been hiding in plain sight. Across India’s mainland and island communities lies an extraordinary genetic record stretching back tens of thousands of years, offering clues about where humanity travelled after leaving Africa.According to CSR Journal, at the centre of many of these discoveries is Dr Kumarasamy Thangaraj, a geneticist whose work has steadily altered how scientists think about migration, ancestry and population history. His research has linked some of India’s most isolated Indigenous communities to some of the earliest chapters of human movement across the planet. Beyond the scientific findings themselves, his career has also demonstrated that world-class genetic research can emerge from Indian institutions and laboratories without relying on the traditional pathways associated with Western academia.
Dr Thangaraj’s DNA research journey and global recognition
While Dr Thangaraj’s career path is unlike many scientists who achieve international acclaim, rather than establishing himself through institutions overseas, he has gained most of his renown through institutions based in India itself.Reportedly, based out of the Center for DNA Fingerprinting and Diagnostics in Hyderabad, he made a name for himself in answering questions which do not pertain just to India but go much further back in time. Through the study of genetics, he sought to reveal migrations and interbreeding of people across continents over thousands of years.This success culminated in the award of the Padma Shri in 2023, which is among India’s highest civilian honors. This came only after his work had become an important factor in understanding the origins and migration of humans.
Andaman Islands study sheds light on ancient human migration
One of the studies most closely associated with Thangaraj examined Indigenous groups living in the Andaman Islands. These communities had long attracted scientific interest because of their relative isolation, but genetic evidence offered a more detailed picture than previous theories could provide.Analysis of mitochondrial DNA revealed connections to some of the earliest populations that left Africa tens of thousands of years ago. CSR Journal reports, the findings suggested that these island communities retained genetic lineages dating back roughly 65,000 years, making them among the oldest surviving branches of humanity outside the African continent.The implications extended far beyond the islands themselves. Scientists gained stronger support for the idea that early humans moved eastward along coastal routes, gradually spreading across Asia before reaching other regions of the world. The genetic evidence emerging from the Andamans provided a rare piece of direct biological information capable of filling gaps left by archaeology alone.
Understanding ancient ancestry without misconceptions
The discovery also prompted wider conversations about how ancient populations are described. Genetic age does not imply cultural isolation from history or suggest that a community exists outside modern civilisation. Rather, it reflects the length of time a particular lineage has remained distinct within the broader human family tree.In the case of the Andaman Islanders, researchers found evidence that certain ancestral lines had remained relatively separate over thousands of generations. This helped preserve genetic signatures that have disappeared or become diluted in many other populations around the world. Ancient ancestry and contemporary identity are not the same thing, and genetics often reveals a far more complex picture than traditional assumptions.
Why India occupies a special place in migration history
The geographic location of India has always provided it as a natural crossroads between the regions. For prehistoric peoples who came from Africa to settle in Asia, the subcontinent could well have been a migration route and at other times a permanent settlement region.However, as genetic research broadened its horizons, increasing numbers of indications led researchers to see India as an important region in studying the dispersal of humans throughout the globe. Various populations from all over India carry genetic signatures that trace back numerous migrations, including those from early on the process of spreading out humans.
