Madrasis and Other Relations

At a recent family dinner, in response to something said in casual conversation, I made the offhand remark that southern Indian populace was rather more homogeneous than its northern counterpart. This, in the context of serial invasions of northern India from the west and osmotic exchange with the east over the centuries, has been a part of one's subconscious forever.

Alok was appalled by my ignorance and pointed out that the south has had a vibrant maritime exchange of peoples with other geographies and probably hosts as much of a genetic potpourri as the north. What's more, while tandoori chicken may taste the same from Amritsar to Birmingham to New York, sambhar tastes verrry different every few miles if you trouble to go by road from Chennai to Thiruvananthapuram.

His mother-in-law, not to be left behind, weighed in with the observation that for north Indians all southerners are Madrasi and they can't tell one Madrasi from another.

I can't quite recall how we got away from this awkward spot but we must have done for I live to tell the tale. However, I was tempted to look up and see how far wrong I had been.

Way Out West
The genetic make-up of Indians seems to have attracted quite some scholarly interest in the 21st century and some major studies have been carried out during the last decade or so. This write-up is based on my understanding at the time of writing. However, scientific research is an ongoing process and I am sure our understanding will improve as we go along.

Research papers on genetic studies, in keeping with the highest traditions of academia, are awash with jargon and far from unanimous. Most seem to draw conflicting conclusions to suit preconceived hypotheses from similar numbers by massaging them a bit differently.

Hence it is that, in keeping with the lowest traditions of second hand research, one can draw some fairly simple, and simplistic, conclusions:

• There has not been any major influx of Central Asian genes into India for over ten millennia.
• The Indo-European linguistic links are more recent than that and are not explained by conquest or large scale in-migration. 
• Genetically the population of India is fairly heterogeneous and the bulk of it descends from two major genetic groupings which have been assigned the names  
• Ancestral South Indians (ASI), and  
• Ancestral North Indians (ANI).
• The two major streams probably arrived in the sub-continent at different destinations along different routes at different times from Africa.
• There are no pure ASI and ANI lines left on mainland India.

• The ASI line is the older one and has very little presence in north India.
• The purest ASI line is to be found in the Andamans. It is quite possible that the ASI stream landed first in the Andaman islands and 'flew' across to south India.
• The ASI line does not seem to have any linkages beyond the sub-continent and the Andaman islands although some very weak links have been traced to the Australian aborigines.

• The ANI line has a fairly strong presence in south India.
• The ANI line is genetically linked to certain Middle Eastern, Central Asian and  Eastern European populations but not to Western European populations. These links are weak and probably date back to a pre-ice age male ancestor. 

...and Our Relations
The ANI linkages, quite counter-intuitively, do not seem to sit on a continuum but seem to exist at discrete points and at distant locations.

This has created some interesting connections. For example, the R1a1 genetic haplogroup, descendants of a common male ancestor, probably Indian, is strongly marked among Punjabi Khatris of the Indus basin; high-caste brahmins of Bengal and Konkan; certain eastern European populations; and the Chenchu tribes of Andhra.

Who would have thought that

• a certain ageing, Bangalore based golfer; 
• the world's best daughter-in-law,  rooted to a Konkan town better known for sending out terrorists; 
• a certain Illinois based, internationally noted trade economist of Bengali origin; 
• an avatar of Lord Vishnu's consort Mahalaksmi, Chenchu Lakshmi, forever ingrained, in said ageing golfer's mind as the buxom Anjali Devi  from the 1958 movie; 
• and the lithe blonde Lithuanian shaking her booty in a Bollywood number, unknowingly but comfortably ensconced among her kin, as the contemporary take on feminine allure;

are all distant cousins?

Selected Readings:

1. Large Scale Influx from Central Asia?
2. Coancestry of European & Asian Chromosomes
3. Genetic Heritage of Tribal & Caste Indians
4. The Origin of Paternal Haplogroup R1a1   (download)
5. Land of Seven Rivers (Book)