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Population genetic analysis among five Indian population groups using six microsatellite markers.
Anu Ghosh1, Birajalaxmi Das, M Seshadri
1Low Level Radiation Studies Section, Bio-Science Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
Human Biology
|August 29, 2003
Summary
Genetic analysis of five Indian ethnic groups reveals high genetic diversity within populations (>98%) and low variation between them (<2%). This suggests significant gene flow or recent evolution, despite cultural and linguistic differences.
Area of Science:
- Population Genetics
- Human Genetics
- Molecular Anthropology
Background:
- Investigating genetic variation in endogamous populations is crucial for understanding human migration and evolutionary history.
- India's diverse ethnic landscape, shaped by linguistic families and social structures, provides a unique context for population genetic studies.
Purpose of the Study:
- To determine the genetic variation at six tetranucleotide microsatellite loci in five distinct Indian ethnic groups.
- To analyze the genetic differentiation and relatedness among populations from different linguistic families (Indo-Aryan and Dravidian) and geographical regions (Maharashtra and Kerala).
Main Methods:
- Analysis of genetic variation at six tetranucleotide microsatellite markers (HUMTHO1, HUMVWA, F13A01, D3S1359, D12S66, and D12S67).
- Studied five endogamous ethnic groups: Konkanastha Brahmins, Marathas, Nairs, Ezhavas, and Muslims.
- Calculated gene diversity (heterozygosity) and population differentiation (GST) values.
Main Results:
- All six microsatellite loci exhibited high gene diversity, with values ranging from 0.63 to 0.84.
- The average GST value was 1.7%, indicating minimal genetic differentiation between the studied populations.
- Phylogenetic analysis did not reveal clear clustering, supporting substantial genetic similarity across groups.
Conclusions:
- The studied Indian populations display high genetic similarity, with variation primarily occurring within groups rather than between them.
- Low inter-population genetic differentiation suggests significant historical gene flow or a relatively recent common ancestry.
- These findings challenge the notion of deep genetic divergence based solely on geographical, linguistic, and cultural barriers in the Indian subcontinent.