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Identity

Throughout its history, the term Uyghur has had an increasingly expansive definition. Initially signifying only a small coalition of Tiele tribes in northern China, Mongolia and the Altai Mountains, it later denoted citizenship in the Uyghur Khaganate. Finally, it was expanded into an ethnicity whose ancestry originates with the fall of the Uyghur Khaganate in the year 842, causing Uyghur migration from Mongolia into the Tarim Basin. The Uyghurs who moved to the Tarim Basin mixed with the local Tocharians, and converted to the Tocharian religion, and adopted their culture of oasis agriculture. The fluid definition of Uyghur and the diverse ancestry of modern Uyghurs create confusion as to what constitutes true Uyghur ethnography and ethnogenesis. Contemporary scholars consider modern Uyghurs to be the descendants of a number of peoples, including the ancient Uyghurs of Mongolia migrating into the Tarim Basin after the fall of the Uyghur Khaganate, Iranic Saka tribes and other Indo-European peoples inhabiting the Tarim Basin before the arrival of the Turkic Uyghurs.

Uyghur activists identify with the Tarim mummies, remains of an ancient people inhabiting the region, but research into the genetics of ancient Tarim mummies and their links with modern Uyghurs remains problematic, both to Chinese government officials concerned with ethnic separatism and to Uyghur activists concerned the research could affect their indigenous claim.

A genomic study published in 2021 found that these early mummies had high levels of Ancient North Eurasian ancestry (ANE, about 72%), with smaller admixture from Ancient Northeast Asians (ANA, about 28%), but no detectable Western Steppe-related ancestry. They formed a genetically isolated local population that "adopted neighbouring pastoralist and agriculturalist practices, which allowed them to settle and thrive along the shifting riverine oases of the Taklamakan Desert." These mummified individuals were long suspected to have been " Proto-Tocharian -speaking pastoralists", ancestors of the Tocharians, but the authors of this study found no genetic connection with Indo-European -speaking migrants, particularly the Afanasievo or BMAC cultures.