HANOI: Vietnamese scientists have, for the first time, successfully decoded mitochondrial genomes from ancient human bone samples dating back around 2,000 years, marking a significant breakthrough in genetic and archaeological research.
The achievement, made by researchers from the Vietnam Academy of Science and Technology (VAST), not only opens up new research directions into the evolutionary history of human populations but also provides valuable genetic data to help clarify links between ancient and modern populations in the region.
Along with advances in biology and biotechnology, gene sequencing technology has been increasingly applied, particularly in forensic identification and the analysis of long-buried human remains.
It has become a key tool for accessing ancient genetic data, offering strong support for archaeological research and studies of human evolution.
South-East Asia, where humans have inhabited for more than 65,000 years, is regarded as a hotspot of human diversity.
As part of this region, Vietnam has a multi-ethnic population structure shaped by the interaction of five major language families and is home to many important archaeological sites.
However, studies of ancient human remains in Vietnam have largely been confined to archaeology, with limited genetic data, leaving major gaps and debates in reconstructing settlement and evolutionary histories.
To address this gap, Hoang Ha, deputy head of the Department of Application & Development of Technology under the VAST, together with researchers from the academy's Institute of Biology, carried out a project on sequencing genes from archaeological human remains in Việt Nam to support research on human biodiversity and archaeology.
The project, which was conducted from August 2020 and completed in December 2024, applied advanced sequencing and analytical techniques to human bone samples dating approximately 1,000 to 6,000 years ago.
One of the most important outcomes was the successful sequencing of complete mitochondrial genomes from two ancient human bone samples over 2,000 years old excavated at the Dong Xa archaeological site, in the northern province of Hung Yen.
The study produced high-coverage and high-accuracy mitochondrial genome sequences, meeting requirements for further genetic analysis.
Dong Xa is a representative site of the late Dong Son Civilisation.
Although discovered and excavated in the 1980s, it had never before been studied from a genetic perspective.
Recovering genetic material from ancient human remains at Dong Xaand applying modern analytical techniques, such as mitochondrial genome sequencing, short tandem repeat (STR) genetic markers commonly used in forensic science, and nuclear genome analysis, are expected to generate valuable insights for interdisciplinary research combining archaeology and genetics in Vietnam.
Researchers tested mitochondrial DNA extraction and sequencing on 10 human bond sample dated between 1,000 and 2,000 years ago.
These samples had previously been assessed by archaeologists and dated using radiocarbon (carbon-14) methods.
The project also collected genetic samples from modern population groups representing Vietnam’s five major language families nd established STR databases for several ethnic minorities to support population genetics, biodiversity studies and comparisons with ancient Vietnamese populations.
The findings have been published on prestigious international journals such as Molecular Genetics and Genomics, Legal Medicine, and American Journal of Human Biology.
According to Ha one of the greatest challenges was extracting DNA from heavily degraded archaeological bones under Vietns hot and humid tropical climate.
The team tested more than three extraction methods, with the most effective being a large-capacity filtration column combined with complete demineralisation, enabling the recovery of short DNA fragments under 100 base pairs, typical of degraded ancient DNA.
The method was later applied to samples from the Da But era, dating back nearly 6,000 years.
Analysis revealed that these individuals belonged to distinctive haplogroups (genetic population group of people who share a common ancestor on the patriline or the matriline) closely related to ancient South-East Asian populations but rare among modern Vietnamese.
This finding suggests significant changes in population genetic structure over time, reflecting migration, admixture or the disappearance of certain maternal genetic lineages.
The results provide new insights into the evolutionary history of human populations in the region and highlight the possibility that some ancient genetic lineages once present have either vanished or been fully absorbed into other populations. — Vietnam News/ANN
