Tautalus
Regular Member
- Messages
- 550
- Reaction score
- 1,398
- Points
- 93
- Ethnic group
- Portuguese
- Y-DNA haplogroup
- I2-M223 / I-FTB15368
- mtDNA haplogroup
- H6a1b2y
This study presents the first substantial ancient DNA dataset from Mesopotamia itself, analysing 17 individuals from the Bronze and Iron Ages at Bakr Awa in northeastern Iraq. The researchers found that by the Bronze Age, the local population no longer resembled the earlier Neolithic inhabitants of the region. Instead, Bronze Age Bakr Awa contained a remarkably diverse mixture of ancestries connected to Anatolia, northern Mesopotamia, the Levant, the Caucasus, and populations carrying Steppe-derived (Yamnaya-related) ancestry. This genetic diversity mirrors archaeological and historical evidence that Mesopotamia was home to multiple ethnic, linguistic, and cultural groups and served as a major crossroads linking surrounding regions.
The data reveal that this diversity was not merely regional background variation but reflected the presence of individuals with distinct ancestral profiles. Some individuals showed unusually strong affinities to populations from the southern Levant, while others carried substantial Caucasus- and Yamnaya-related ancestry. One male with pronounced Caucasus-related ancestry also carried the R-Z2103 Y-chromosome lineage, a marker associated with Steppe-derived populations that spread into the Caucasus and nearby regions during the Bronze Age. Stable-isotope evidence suggests that this individual likely spent his early life in the Zagros Mountains before moving to Bakr Awa, indicating that long-distance mobility contributed to the site's genetic diversity.
A central question of the paper concerns what happened after Bakr Awa was abandoned following a destructive fire in the Late Bronze Age and later reoccupied in the Iron Age. Rather than finding evidence for a new population replacing the old one, the researchers discovered substantial genetic continuity. Iron Age individuals fall within the range of Bronze Age variation and appear largely descended from the preceding population. However, the distinct ancestry clusters visible in the Bronze Age became less pronounced over time. The Iron Age population seems to have emerged through the integration and blending of previously divergent Bronze Age ancestries, producing a more genetically unified community.
The broader conclusion is that Mesopotamia functioned as a genuine demographic and cultural “melting pot” in antiquity. The study shows that major cultural and political transitions did not necessarily coincide with large-scale population replacement. Instead, populations with diverse origins could coexist, interact, and gradually integrate over generations, producing cultural change without dramatic genetic turnover. According to the authors, the Bronze to Iron Age transition at Bakr Awa is a clear example of this process, demonstrating how ancestry integration rather than migration-driven replacement shaped the region's population history.
Background
The development of complex urban societies in Mesopotamia fundamentally shaped human history, yet the genetic dynamics underlying this process remain poorly understood. Here, we sequence DNA from 17 individuals spanning the Bronze and Iron Ages at Bakr Awa, one of northeastern Iraq's largest ancient settlements located at the border between Mesopotamia and Iran.
Results
Genome-wide analyses reveal substantial genetic heterogeneity during the Bronze Age, characterized by influences of Anatolian, Levantine, and Caucasus/Yamnaya-related ancestries on the local background – complementing archaeological and textual reconstructions of a diverse ethnolinguistic presence at Bakr Awa. This Bronze Age ancestry heterogeneity marks a notable shift from the local Pre-Pottery Neolithic composition – represented by previously published samples from Bestansur, which possess a close affinity to Neolithic central Zagros-related ancestry. The integration of ancient DNA with stable-isotope analysis of 12 individuals reveals multigenerational dynamics and identifies the Zagros Mountains as the most parsimonious recent origin for one of the Bronze Age individuals with Caucasus/Yamnaya-related ancestry. Following the Late Bronze Age site abandonment, reoccupation during the Iron Age involves integrating the preceding Bronze Age divergent ancestries rather than a process of population replacement.
Conclusions
Our findings reveal that heterogeneous ancestries characterise Bronze Age population structure at Bakr Awa, directly mirroring the diverse cultural landscape observed in historical and archaeological sources. Because the subsequent Iron Age transition integrated, rather than replaced, these divergent ancestries, we demonstrate that cultural transitions need not entail large-scale ancestry transformations. Together, these findings capture Mesopotamia's role as a "melting pot" of ancient Near Eastern ethnolinguistic groups.
Downloadable pdf
The data reveal that this diversity was not merely regional background variation but reflected the presence of individuals with distinct ancestral profiles. Some individuals showed unusually strong affinities to populations from the southern Levant, while others carried substantial Caucasus- and Yamnaya-related ancestry. One male with pronounced Caucasus-related ancestry also carried the R-Z2103 Y-chromosome lineage, a marker associated with Steppe-derived populations that spread into the Caucasus and nearby regions during the Bronze Age. Stable-isotope evidence suggests that this individual likely spent his early life in the Zagros Mountains before moving to Bakr Awa, indicating that long-distance mobility contributed to the site's genetic diversity.
A central question of the paper concerns what happened after Bakr Awa was abandoned following a destructive fire in the Late Bronze Age and later reoccupied in the Iron Age. Rather than finding evidence for a new population replacing the old one, the researchers discovered substantial genetic continuity. Iron Age individuals fall within the range of Bronze Age variation and appear largely descended from the preceding population. However, the distinct ancestry clusters visible in the Bronze Age became less pronounced over time. The Iron Age population seems to have emerged through the integration and blending of previously divergent Bronze Age ancestries, producing a more genetically unified community.
The broader conclusion is that Mesopotamia functioned as a genuine demographic and cultural “melting pot” in antiquity. The study shows that major cultural and political transitions did not necessarily coincide with large-scale population replacement. Instead, populations with diverse origins could coexist, interact, and gradually integrate over generations, producing cultural change without dramatic genetic turnover. According to the authors, the Bronze to Iron Age transition at Bakr Awa is a clear example of this process, demonstrating how ancestry integration rather than migration-driven replacement shaped the region's population history.
Background
The development of complex urban societies in Mesopotamia fundamentally shaped human history, yet the genetic dynamics underlying this process remain poorly understood. Here, we sequence DNA from 17 individuals spanning the Bronze and Iron Ages at Bakr Awa, one of northeastern Iraq's largest ancient settlements located at the border between Mesopotamia and Iran.
Results
Genome-wide analyses reveal substantial genetic heterogeneity during the Bronze Age, characterized by influences of Anatolian, Levantine, and Caucasus/Yamnaya-related ancestries on the local background – complementing archaeological and textual reconstructions of a diverse ethnolinguistic presence at Bakr Awa. This Bronze Age ancestry heterogeneity marks a notable shift from the local Pre-Pottery Neolithic composition – represented by previously published samples from Bestansur, which possess a close affinity to Neolithic central Zagros-related ancestry. The integration of ancient DNA with stable-isotope analysis of 12 individuals reveals multigenerational dynamics and identifies the Zagros Mountains as the most parsimonious recent origin for one of the Bronze Age individuals with Caucasus/Yamnaya-related ancestry. Following the Late Bronze Age site abandonment, reoccupation during the Iron Age involves integrating the preceding Bronze Age divergent ancestries rather than a process of population replacement.
Conclusions
Our findings reveal that heterogeneous ancestries characterise Bronze Age population structure at Bakr Awa, directly mirroring the diverse cultural landscape observed in historical and archaeological sources. Because the subsequent Iron Age transition integrated, rather than replaced, these divergent ancestries, we demonstrate that cultural transitions need not entail large-scale ancestry transformations. Together, these findings capture Mesopotamia's role as a "melting pot" of ancient Near Eastern ethnolinguistic groups.
Downloadable pdf
Maps displaying significant genetic individual-clade connections between Bakr Awa individuals and ancient populations from surrounding regions across three time periods
Haplogroups
| Genetic ID | Dates | Mesopotamian periods | Archaeological Period | Sex | Major mtDNA Haplogroup | Y-Chr haplogroup |
| A22051 | 2000-1800 BC | Isin-Larsa | Early Middle Bronze Age | XX | I5c | - |
| A22033 | 2130-1937 calBCE | Akkadian/UrIII/Isin-Larsa | Late Early Bronze Age - Early Middle Bronze Age | XX | T2 | - |
| A22034 | 2130-1937 calBCE | Akkadian/UrIII/Isin-Larsa | Late Early Bronze Age - Early Middle Bronze Age | U | T2 | - |
| A20578 | 2197-2031 calBCE | Akkadian/UrIII/Isin-Larsa | Late Early Bronze Age - Early Middle Bronze Age | XY | HV | NA |
| A22045 | 2197-2031 calBCE | Akkadian/UrIII/Isin-Larsa | Late Early Bronze Age - Early Middle Bronze Age | XX | X2 | - |
| A20578 | 2197-2031 calBCE | Akkadian/UrIII/Isin-Larsa | Late Early Bronze Age - Early Middle Bronze Age | U | - | |
| A22038 | 2340-1800 BC | Akkadian/UrIII/Isin-Larsa | Late Early Bronze Age - Early Middle Bronze Age | XX | U3b1a | - |
| A22039 | 2340-1800 BC | Akkadian/UrIII/Isin-Larsa | Late Early Bronze Age - Early Middle Bronze Age | XX | W6 | - |
| A22037 | 2112-1800 BC | UrIII/Isin-Larsa | Late Early Bronze Age - Early Middle Bronze Age | XY | H13a1a2 | R-Z2103 |
| A22041 | - | - | Late Early Bronze Age | XY | U2d2 | J-P81 |
| A22047 | - | - | Late Early Bronze Age | XY | K1a | E-M84 |
| A22054 | 1918-1743 calBCE | Isin-Larsa/Old-Babylonian | Middle Bronze Age | U | H2a2a1 | - |
| A22043 | 1919-1751 calBCE | Isin-Larsa/Old-Babylonian | Middle Bronze Age | XY | U3 | G-Y37100 |
| A22048 | 2000-1600 BC | Isin-Larsa/Old-Babylonian | Middle Bronze Age | XY | H2a2 | J-PF5119 |
| A22036 | 2015-1778 calBCE | Isin-Larsa/Old-Babylonian | Middle Bronze Age | XY | N1b1a3 | J-PH128*(xY29688) |
| A22022 | 2015-1778 calBCE | Isin-Larsa/Old-Babylonian | Middle Bronze Age | XY | U3a3 | J-PH128*(xY29688) |
| A22023 | 2015-1778 calBCE | Isin-Larsa/Old-Babylonian | Middle Bronze Age | XX | K1a3 | - |
| A22032 | 2015-1778 calBCE | Isin-Larsa/Old-Babylonian | Middle Bronze Age | XX | J1b1a3 | - |
| A22035 | 2015-1778 calBCE | Isin-Larsa/Old-Babylonian | Middle Bronze Age | XY | U3a3 | J-PH128*(xY29688) |
| A22052 | 1800-1595 BC | Old Babylonian | Late Middle Bronze Age | XX | J1+16193 | - |
| A22053 | 1951-1774 calBCE | Old-Babylonian | Late Middle Bronze Age | - | - | |
| A22040 | 2000-1600 // 1200-300 BC | - | (Middle Bronze Age/Iron Age: contextually ambiguous) | XY | J1b1b1 | H-Y28140*(xY90124,Z41291) |
| A20576 | 454-381 calBCE | Achaemenid | Iron Age | U | U1a1c1 | - |
| A20577 | 550-331 BC | Achaemenid | Iron Age | U | H13a | - |
| A22025 | 550-331 BC | Achaemenid | Iron Age | U | H6a1b | - |
| A22027 | 550-331 BC | Achaemenid | Iron Age | XX | T2a1a | - |
| A22026 | 1000-612/539 BC | Neo-Assyrian/Neo-Babylonian | Iron Age | XX | T1a7 | - |
| A22059 | 1000-612/539 BC | Neo-Assyrian/Neo-Babylonian | Iron Age | XY | K1a | E-Y20282*(xBY6871, Y72713, Y142136, BY6865,Y20808) |
Last edited: