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The genetic basis of LP has been investigated in many populations in the world. Iran has a long history of pastoralism and the daily consumption of dairy products; thus, we aim to assess how LP has evolved in the Iranian population. We recruited 400 adult individuals from seven Iranian ethnic groups, from whom we investigated their lactose tolerance and screened the genetic variants in their lactase gene locus.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The LP frequency distribution ranged from 0 to 29.9% in the seven Iranian ethnic groups with an average value of 9.8%. The variants, \u2212\u2009<jats:italic>13910*T<\/jats:italic> and \u2212\u2009<jats:italic>22018*A<\/jats:italic>, were significantly associated with LP phenotype in Iranians. We found no evidence of hard selective sweep for \u2212\u2009<jats:italic>13910*T<\/jats:italic> and \u2212\u2009<jats:italic>22018*A<\/jats:italic> in Persians, the largest ethnic group of Iran. The extremely low frequency of \u2212\u2009<jats:italic>13915*G<\/jats:italic> in the Iranian population challenged the view that LP distribution in Iran resulted from the demic diffusion, especially mediated by the spread of Islam, from the Arabian Peninsula.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Our results indicate the distribution of LP in seven ethnic groups across the Iranian plateau. Soft selective sweep rather than hard selective sweep played a substantial role in the evolution of LP in Iranian populations.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40246-019-0195-5","type":"journal-article","created":{"date-parts":[[2019,2,11]],"date-time":"2019-02-11T14:05:15Z","timestamp":1549893915000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["The evolutionary genetics of lactase persistence in seven ethnic groups across the Iranian plateau"],"prefix":"10.1186","volume":"13","author":[{"given":"Hadi","family":"Charati","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min-Sheng","family":"Peng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing-Yan","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roghayeh","family":"Jabbari Ori","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohsen","family":"Aghajanpour-Mir","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ali","family":"Esmailizadeh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ya-Ping","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,2,11]]},"reference":[{"key":"195_CR1","doi-asserted-by":"publisher","first-page":"579","DOI":"10.1007\/s00439-008-0593-6","volume":"124","author":"CJ Ingram","year":"2009","unstructured":"Ingram CJ, Mulcare CA, Itan Y, Thomas MG, Swallow DM. 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