Evaluating population histories in Patagonia and Tierra del Fuego, Chile, using ancient mitochondrial and Y‐chromosomal DNA
Evaluating population histories in Patagonia and Tierra del Fuego, Chile, using ancient mitochondrial and Y‐chromosomal DNA
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使用古代线粒体和 Y 染色体 DNA 评估智利巴塔哥尼亚和火地岛的人口历史
DOI：
10.1002/ajpa.24638
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Mata‐Míguez, Jaime
中科院分区：
文献类型：
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作者：
Balentine, Christina M.;Alfonso‐Durruty, Marta;Reynolds, Austin W.;Vilar, Miguel;Morello, Flavia;Román, Manuel San;Springs, Lauren C.;Smith, Rick W. A.;Archer, Samantha M.;Mata‐Míguez, Jaime
ObjectivesThis study aims to characterize the genetic history of ancient hunter-gatherer groups in Fuego-Patagonia（Chile）with distinct Marine，Terrestrial，and Mixed Economy sustainable strategies.生成线粒体（mtDNA）和Y染色体数据以检验三种假设。第0阶段：所有个体均来自同一个泛混居种群; H1：陆地种群首先在该地区定居，并在约7，500 cal BP时产生高度专业化的海洋种群;或H2：海洋和陆地群体代表了不同的祖先血统谁独立迁移到region.MethodsAncient DNA提取的牙齿50 Fuegian-Patagonian个人约会从6，895 cal BP，并与先前研究中的其他个体一起进行分析。根据考古背景和稳定同位素饮食推断，将个体分配到海洋，陆地和混合经济组，并对mtDNA（HVR 1/2）和Y染色体变异进行了分析。单倍型差异、FST比较和群体分化的精确检验表明，基于mtDNA的海洋类群与陆地类群存在显著差异（p< 0.05）。在陆地经济和混合经济群体之间没有发现统计上的显著差异。人口统计模拟支持的模型中，海洋集团从其他分歧约14,000 cal BP。Y染色体结果显示了类似的模式，但没有统计学意义，由于小样本量和等位基因dropout.DiscussionThese结果支持的假设，海洋和陆地经济群体代表不同的祖先血统谁在人口扩大的时间在美洲，并可能代表独立的迁移到火地岛巴塔哥尼亚。
ObjectivesThis study aims to characterize the genetic histories of ancient hunter‐gatherer groups in Fuego‐Patagonia (Chile) with distinct Marine, Terrestrial, and Mixed Economy subsistence strategies. Mitochondrial (mtDNA) and Y‐chromosome data were generated to test three hypotheses. H0: All individuals were drawn from the same panmictic population; H1: Terrestrial groups first populated the region and gave rise to highly specialized Marine groups by ~7,500 cal BP; or H2: Marine and Terrestrial groups represent distinct ancestral lineages who migrated independently into the region.MethodsAncient DNA was extracted from the teeth of 50 Fuegian‐Patagonian individuals dating from 6,895 cal BP to after European arrival, and analyzed alongside other individuals from previous studies. Individuals were assigned to Marine, Terrestrial, and Mixed Economy groups based on archeological context and stable isotope diet inferences, and mtDNA (HVR1/2) and Y‐chromosome variation was analyzed.ResultsEndogenous aDNA was obtained from 49/50 (98%) individuals. Haplotype diversities, FSTcomparisons, and exact tests of population differentiation showed that Marine groups were significantly different from Terrestrial groups based on mtDNA (p< 0.05). No statistically significant differences were found between Terrestrial and Mixed Economy groups. Demographic simulations support models in which Marine groups diverged from the others by ~14,000 cal BP. Y‐chromosome results showed similar patterns but were not statistically significant due to small sample sizes and allelic dropout.DiscussionThese results support the hypothesis that Marine and Terrestrial economic groups represent distinct ancestral lineages who diverged during the time populations were expanding in the Americas, and may represent independent migrations into Fuego‐Patagonia.