Mbuti Yamnaya_Samara Iberia_ChL Iberia_BA D 0.0031 Z 0.859 Mbuti Yamnaya_Samara Iberia_ChL Basque_French D 0.0086 Z 5.035 Mbuti Yamnaya_Samara Basque_French Iberia_BA D -0.0044 Z -1.316Surprisingly, based on those D-stats ATP9 doesn't appear to share more drift with Yamnaya Samara relative to Iberia_ChL (Z<3). But I suspect this might be due to inflated hunter-gatherer ancestry in Iberia_ChL, so let's try something a little different.
Western_HG Yamnaya_Samara Iberia_ChL Iberia_BA D 0.0188 Z 4.987 Western_HG Yamnaya_Samara Iberia_ChL Basque_French D 0.024 Z 13.163 Western_HG Yamnaya_Samara Basque_French Iberia_BA D -0.0063 Z -1.768OK, that's basically in line with the PCA above, and I can cement this finding with the qpAdm algorithm. Note the nice chunk of Early Bronze Age steppe (Steppe_EBA) ancestry in ATP9.
Outgroups AG3-MA1 Chukchi Dusun Igorot Iran_Neolithic Karitiana Kosipe Kostenki14 Lebbo Levant_Neolithic Mbuti Satsurblia Ust_Ishim Villabruna Iberia_BA ATP9 Caucasus_HG 0.038±0.063 Lengyel_LN 0.683±0.066 Steppe_EBA 0.177±0.087 Western_HG 0.102±0.044 chisq 5.216 tail_prob 0.876272 Spanish Caucasus_HG 0.014±0.028 Lengyel_LN 0.607±0.028 Nganasan 0.011±0.016 Onge 0.013±0.022 Steppe_EBA 0.273±0.043 Western_HG 0.059±0.020 Yoruba 0.021±0.006 chisq 1.605 tail_prob 0.978452 Basque_French Lengyel_LN 0.590±0.027 Nganasan 0.009±0.016 Onge 0.015±0.022 Steppe_EBA 0.285±0.031 Western_HG 0.096±0.019 Yoruba 0.006±0.006 chisq 3.485 tail_prob 0.900346Of course, Basques are not Indo-Europeans, so the fact that ATP9 has some Yamnaya-related ancestry doesn't necessarily mean she was an Indo-European. However, it's not unreasonable to assume that the ancestors of Basques incurred gene flow from early Indo-Europeans moving into the Iberian Peninsula, and this probably explains their relatively high level of Yamnaya-related ancestry. So ATP9 may well have spoken an Indo-European language, and if not, then like Basques she probably has Indo-European ancestry