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.2011 Jul 15;89(1):154-61.
doi: 10.1016/j.ajhg.2011.05.030. Epub 2011 Jul 7.

Indian Siddis: African descendants with Indian admixture

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Indian Siddis: African descendants with Indian admixture

Anish M Shah et al. Am J Hum Genet..

Abstract

The Siddis (Afro-Indians) are a tribal population whose members live in coastal Karnataka, Gujarat, and in some parts of Andhra Pradesh. Historical records indicate that the Portuguese brought the Siddis to India from Africa about 300-500 years ago; however, there is little information about their more precise ancestral origins. Here, we perform a genome-wide survey to understand the population history of the Siddis. Using hundreds of thousands of autosomal markers, we show that they have inherited ancestry from Africans, Indians, and possibly Europeans (Portuguese). Additionally, analyses of the uniparental (Y-chromosomal and mitochondrial DNA) markers indicate that the Siddis trace their ancestry to Bantu speakers from sub-Saharan Africa. We estimate that the admixture between the African ancestors of the Siddis and neighboring South Asian groups probably occurred in the past eight generations (∼200 years ago), consistent with historical records.

Copyright © 2011 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

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Figures

Figure 1
Figure 1
African Ancestries in Siddis (A) Principal-components analysis of three Siddi groups, HapMap Phase 3 populations (CEU, YRI, and CHB), and 16 Indian groups. (B) Schematic representation of the proportions of African and ICP ancestry in Siddis. ICP includes the 16 Indian groups and Portuguese and represents the ancestral non-African population.
Figure 2
Figure 2
ROLLOFF Analysis of Siddis We analyzed 12 Siddi samples from Karnataka and Gujarat and estimated admixture linkage disequilibrium by computing the LD between all pairs of markers and weighting it by the frequency differentiation between the ancestral populations (YRI and ICP). We observed an approximately exponential decay of LD with distance and found an average estimated date of admixture of 8 ± 1 generations. This corresponds to a time of around 200 years (if we assume a generation interval of 25 years). The estimated dates of admixture for Siddi_Karnataka-1 and Siddi_Gujarat are 6 ± 1 and 8 ± 1 generations, respectively. Standard errors were computed with a weighted block jackknife as described in Moorjani et al.
Figure 3
Figure 3
Y-Chromosomal and mtDNA Haplogroups in Siddis (A) Y-chromosomal haplogroup frequencies in the populations analyzed. Abbreviations are as follows: SG, Siddis from Gujarat; CH, Charan; BH, Bharwad; SK, Siddis from Karnataka; MD, Medar; GV, Gram Vokkal; KR, Korova; and KV, Kare Vokkal. The African-specific B and E1b1a haplogroups in India were found exclusively among the Siddi population. (B) Distribution of mtDNA haplogroups in Siddis. Details of diagnostic mutations that define haplogroups are shown in Figure S5.
Figure 4
Figure 4
Migration History of the Siddis Dotted arrows represent the expansion of Bantu speakers with agriculture within Africa. Agriculture in Africa started from the central western part of the continent and proceeded toward the east and south of the subcontinent. The shaded gray area represents the Portuguese territory, and the lines between Africa and India represent the path that the Portuguese might have used during the 15th–19th centuries to supply African slaves to Indian rulers on the western coast of India.
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References

    1. Lodhi A. African settlements in India. Nordic Journal of African Studies. 1992;1:83–86.
    1. Bhattacharya D. Indians of African origin. Cah. Etud. Afr. 1970;10:579–582.
    1. Gauniyal M., Chahal S.M., Kshatriya G.K. Genetic affinities of the Siddis of South India: an emigrant population of East Africa. Hum. Biol. 2008;80:251–270. - PubMed
    1. Thangaraj K., Ramana G.V., Singh L. Y-chromosome and mitochondrial DNA polymorphisms in Indian populations. Electrophoresis. 1999;20:1743–1747. - PubMed
    1. Ramana G.V., Su B., Jin L., Singh L., Wang N., Underhill P., Chakraborty R. Y-chromosome SNP haplotypes suggest evidence of gene flow among caste, tribe, and the migrant Siddi populations of Andhra Pradesh, South India. Eur. J. Hum. Genet. 2001;9:695–700. - PubMed

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