Genomic detection of a secondary family burial in a single jar coffin in early Medieval Korea

Abstract

ObjectivesFamily relationship is a key to understand the structure of past societies but its archaeological reconstruction mostly stays circumstantial. Archaeogenetic information, especially genome-wide data, provide an objective approach to accurately reconstruct the familial relationship of ancient individuals, thus allowing a robust test of an archaeology-driven hypothesis of kinship. In this study, we applied this approach to disentangle the genetic relationship of early Medieval individuals from Korea, who were secondarily co-buried in a single jar coffin. Materials and MethodsWe obtained genome-wide data of six early Medieval Korean individuals from a jar coffin. We inferred the genetic relatedness between these individuals and characterized their genetic profiles using well-established population genetics methods. ResultsCongruent with the unusual pattern of multiple individuals in a single jar coffin, genome-wide analysis of these individuals shows that they form an extended family, including a couple, their two children and both paternal and maternal relatives. We show that these early Medieval Koreans have a genetic profile similar to present-day Koreans. DiscussionWe show that an unusual case of a secondary multiple burial in a single jar coffin reflects family relationship among the co-buried individuals. We find both paternal and maternal relatives coburied with the nuclear family, which may suggest a family structure with limited gender bias. We find the genetic profile of early Medieval Koreans similar to that of present-day Koreans, suggesting no substantial genetic shift in the Korean peninsula for the last 1,500 years. Research HighlightsO_LIAncient genome-wide data find a family buried together in a jar coffin in early Medieval Korea. C_LIO_LIThese early Medieval Koreans have a genetic profile similar to present-day Koreans. C_LI