Genetic studies on Sri Lankan Tamils
Although Sri Lankan Tamils are culturally and linguistically distinct, genetic studies indicate that they are closely related to other ethnic groups in the island while being related to the Indian Tamils from South India and Bengalis from the Northeast India as well. There are various studies that indicate varying degrees of connections between Sri Lankan Tamils, Sinhalese and Indian ethnic groups.
Study by Dr. Gautam K. Kshatriya
According to a genetic admixture study by Dr. Gautam K. Kshatriya in 1995, the Sri Lankan Tamil are closely related to the Sinhalese who are closely related to Indian Tamils. Kshatriya found the Sri Lankan Tamils to have a greater contribution from the Sinhalese of Sri Lanka (55.20% +/- 9.47) while the Sinhalese had the greatest contribution from South Indian Tamils (69.86% +/- 0.61), followed by Bengalis from the Northeast India (25.41% +/- 0.51). With both the Sri Lankan Tamils and Sinhalese in the island sharing a common gene pool of 55%. They are farthest from the indigenous Veddahs. This close relationship between the Sri Lankan Tamils and Sinhalese makes sense, as the two populations have been close to each other historically, linguistically, and culturally for over 2000 years.
This is also supported by a genetic distance study, which showed low differences in genetic distance between Tamils and the Sinhalese. Tamils and the Sinhalese also share similar cultures in terms of kinship classification, cousin marriage, dress and housing.
However, these studies do not consider various diverse Veddah groups: Veddahs have a higher diversity between groups than Sinhalese and Tamils do. Later studies have established some connections and links between certain Veddah groups towards North and Sri Lankan Tamils.
The observation that the Sinhalese has highest contribution from South Indian Tamils is challenged by new studies. See Genetic_studies_on_Sinhalese. It is shown that 72% of genetic admixture comes from Bengali rather than South Indian Tamil.
Also, studies show that the Tamil population in Sri Lanka is a result of mixing migrated Tamils with native Sinhalese in Northern Province.
Furthermore, a study looking at genetic variation of the FUT2 gene in the Sri Lankan Tamil and Sinhalese population, found similar genetic backgrounds for both ethnic groups, with little genetic flow from other neighbouring Asian population groups. Studies have also found no significant difference with regards to blood group, blood genetic markers and single-nucleotide polymorphism between the Sri Lankan Tamils and other ethnic groups in Sri Lanka. Another study has also found "no significant genetic variation among the major ethnic groups in Sri Lanka". This is further supported by a study which found very similar frequencies of alleles MTHFR 677T, F2 20210A & F5 1691A in South Indian Tamil, Sinhalese, Sri Lankan Tamil and Moor populations.
However, another study looking at Alu polymorphism, VNTR and genetic distance have found the genetic relationship between the South Indian Tamil and Sinhalese to be much smaller than Kshatriya's findings (11–30%).
- South Asian ethnic groups
- Y-DNA haplogroups by ethnic group
- Y-DNA haplogroups in populations of South Asia
- Haplogroup M30 (mtDNA)
- Haplogroup T (Y-DNA)
- Haplogroup R1a (Y-DNA)
- Haplogroup M18
- Kshatriya, G.K. (1995). "Genetic affinities of Sri Lankan populations". Human Biology. American Association of Anthropological Genetics. 67 (6): 843–66. PMID 8543296.
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- Yalman, Nur (1 January 1962). "The Structure of the Sinhalese Kindred: A Re-Examination of the Dravidian Terminology". American Anthropologist. 64 (3): 548–575. Retrieved 3 May 2017 – via JSTOR.
- Ranaweera, Lanka; Kaewsutthi, Supannee; Win Tun, Aung; Boonyarit, Hathaichanoke; Poolsuwan, Samerchai; Lertrit, Patcharee (1 January 2014). "Mitochondrial DNA history of Sri Lankan ethnic people: their relations within the island and with the Indian subcontinental populations". Journal of Human Genetics. 59 (1): 28–36. doi:10.1038/jhg.2013.112. Retrieved 3 May 2017 – via www.nature.com.
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- Dissanayake VH, Giles V, Jayasekara RW, et al. (April 2009). "A study of three candidate genes for pre-eclampsia in a Sinhalese population from Sri Lanka". The Journal of Obstetrics and Gynaecology Research. 35 (2): 234–42. doi:10.1111/j.1447-0756.2008.00926.x. PMID 19708171.
- Ruwan J. Illeperuma, Samudi N. Mohotti, Thilini M. De Silva, Neil D. Fernandopulle, W.D. Ratnasooriya, Genetic profile of 11 autosomal STR loci among the four major ethnic groups in Sri Lanka, Forensic Science International: Genetics, Volume 3, Issue 3, June 2009, Pages e105-e106
- Vajira H.W. Dissanayake, Lakshini Y. Weerasekera, C. Gayani Gammulla, Rohan W. Jayasekara, Prevalence of genetic thrombophilic polymorphisms in the Sri Lankan population – implications for association study design and clinical genetic testing services, Experimental and Molecular Pathology, Volume 87, Issue 2, October 2009, Pages 159–162
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