Y-chromosomal insights into the genetic impact of the caste system in India

Tatiana Zerjal, Arpita Pandya, Kumarasamy Thangaraj, Edmund Y.S. Ling, Jennifer Kearley, Stefania Bertoneri, Silvia Paracchini, Lalji Singh, Chris Tyler-Smith*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


The caste system has persisted in Indian Hindu society for around 3,500 years. Like the Y chromosome, caste is defined at birth, and males cannot change their caste. In order to investigate the genetic consequences of this system, we have analysed male-lineage variation in a sample of 227 Indian men of known caste, 141 from the Jaunpur district of Uttar Pradesh and 86 from the rest of India. We typed 131 Y-chromosomal binary markers and 16 microsatellites. We find striking evidence for male substructure: in particular, Brahmins and Kshatriyas (but not other castes) from Jaunpur each show low diversity and the predominance of a single distinct cluster of haplotypes. These findings confirm the genetic isolation and drift within the Jaunpur upper castes, which are likely to result from founder effects and social factors. In the other castes, there may be either larger effective population sizes, or less strict isolation, or both.

Original languageEnglish
Pages (from-to)137-144
Number of pages8
JournalHuman Genetics
Issue number1
Publication statusPublished - 1 Jan 2007


  • Haplotype
  • Humanpopulation substructure
  • Indiancaste system
  • Y chromosome


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