Biology:Genetic studies on Sri Lankan Tamils

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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 East 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 East 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.[1] This is also supported by a genetic distance study, which showed low differences in genetic distance between Tamils and the Sinhalese.[2] Tamils and the Sinhalese also share similar cultures in terms of kinship classification, cousin marriage, dress and housing.[3]

Other studies

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.[4] 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.[5][6][7] Another study has also found "no significant genetic variation among the major ethnic groups in Sri Lanka".[8] 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.[9]

However, another study looking at Alu polymorphism,[10] VNTR[11] and genetic distance[2] have found the genetic relationship between the South Indian Tamil and Sinhalese to be much smaller than Kshatriya's findings (11–30%).

Dr Sarabjit Mastanain finding states cophenetic correlation was 0.8956 and it indicates Sinhalese & Tamil as native population. Also, it reflects on genetic distance among five populations of Sri Lanka as per given below eigenvector plot of the R-matrix.[12]

Genetic distance
 
 

Burgher

 
 
 
 

Malay

 
 
 

Moor

 
 
 

Tamil

 
 

Sinhalese

 
 
 
 
(5 populations of Sri Lanka)

See also

References

  1. ↑ Kshatriya, G.K. (1995). "Genetic affinities of Sri Lankan populations". Human Biology (American Association of Anthropological Genetics) 67 (6): 843–66. PMID 8543296. 
  2. ↑ 2.0 2.1 Kirk, R. L. (1976). "The legend of Prince Vijaya — a study of Sinhalese origins". American Journal of Physical Anthropology 45 (1): 91–99. doi:10.1002/ajpa.1330450112. 
  3. ↑ Yalman, Nur (1 January 1962). "The Structure of the Sinhalese Kindred: A Re-Examination of the Dravidian Terminology". American Anthropologist 64 (3): 548–575. doi:10.1525/aa.1962.64.3.02a00060. 
  4. ↑ "Denaturing high-performance liquid chromatography-based genotyping and genetic variation of FUT2 in Sri Lanka". Transfusion 45 (12): 1934–9. December 2005. doi:10.1111/j.1537-2995.2005.00651.x. PMID 16371047. 
  5. ↑ Roberts, D. F.; Creen, C. K.; Abeyaratne, K. P. (1 January 1972). "Blood Groups of the Sinhalese". Man 7 (1): 122–127. doi:10.2307/2799860. 
  6. ↑ Saha, N. (1988). "Blood genetic markers in Sri Lankan populations—reappraisal of the legend of Prince Vijaya". American Journal of Physical Anthropology 76 (2): 217–25. doi:10.1002/ajpa.1330760210. PMID 3166342. 
  7. ↑ "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. April 2009. doi:10.1111/j.1447-0756.2008.00926.x. PMID 19708171. 
  8. ↑ 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
  9. ↑ 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
  10. ↑ http://www.krepublishers.com/06-Special%20Volume-Journal/T-Anth-00-Special%20Volumes/T-Anth-SI-03-Anth-Today-Web/Anth-SI-03-29-Mastana-S/Anth-SI-03-29-Mastana-S-Tt.pdf [bare URL PDF]
  11. ↑ "Population genetic study of three VNTR loci (D2S44, D7S22, and D12S11) in five ethnically defined populations of the Indian subcontinent". Human Biology 68 (5): 819–35. October 1996. PMID 8908803. 
  12. ↑ Mastana, Sarabjit (November 1996). "Genetic variation in Sri Lanka". Scientific Reports 68 (5): 26–27. PMID 8908798. https://www.researchgate.net/publication/14297881. 



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