India: Five distinct ancestral components and a complex structure revealed by genomic reconstruction of the history of extant populations

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Republication from pnas.org

(A) Scatterplot of 331 individuals from 18 mainland Indian populations by the first two PCs extracted from genome-wide genotype data. Four distinct clines and clusters were noted; these are encircled using four colors. (B) Estimates of ancestral components of 331 individuals from 18 mainland Indian populations. A model with four ancestral
 components (K = 4) was the most parsimonious to explain the variation and similarities of the genomewide genotype data on the 331 individuals. Each individual is represented by a vertical line partitioned into colored segments whose lengths are proportional to the contributions of the ancestral components to the genome of the individual. Population
labels were added only after each individual’s  ancestry had been estimated. We have used green and red to represent ANI and ASI ancestries; and cyan and blue with the inferred AAA and ATB ancestries. These colors correspond to the colors  used to encircle clusters of individuals in A. (Also see  SI Appendix, Figs. S2 and S3.)



India, harboring more than one-sixth of the world population, has been underrepresented in genome-wide studies of variation. Our analysis reveals that there are four dominant ancestries in mainland populations of India, contrary to two ancestries inferred earlier. We also show that (i) there is a distinctive ancestry of the Andaman and Nicobar Islands populations that is likely ancestral also to Oceanic populations, and (ii) the extant mainland populations admixed widely irrespective of ancestry, which was rapidly replaced by endogamy, particularly among Indo-European–speaking upper castes, about 70 generations ago. This coincides with the historical period of formulation and adoption of some relevant sociocultural norms.



Weaponry of the Indian subcontinent (India, Pakistan, Bangladesh, Sri-Lanka) (part I)

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This is a collection of weapons from the Indian subcontinent of the last centuries, that is the eras of the Mughal Empire, the Maratha Confederation and the British sovereignty. They belong to Hindu, Moslem and much less Buddhist (mostly Sri-Lankan) armies as well and are typical of Indian warfare during those centuries. The following images include a Maratha armour and elaborate helmet (front and side view), four other


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