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Familial erythrocytosis (FE) is a congenital disorder with different genetic background. Type 1 FE is primary FE caused by mutation in erythropoietin receptor gene (<jats:italic>EPOR<\/jats:italic>). Type 2\u20105 FE are secondary FEs caused by mutations of genes involved in oxygen sensing pathway important for erythropoietin (<jats:italic>EPO<\/jats:italic>) regulation. In the present study, we summarized associations between <jats:italic>EPOR<\/jats:italic> and <jats:italic>EPO<\/jats:italic> gene variations with development of FE and searched for genetic variants located within regulatory regions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Publications reporting <jats:italic>EPOR<\/jats:italic> and <jats:italic>EPO<\/jats:italic> sequence variants associated with FE or clinical features of erythrocytosis were retrieved from PubMed and WoS. In silico, sequence reanalysis was performed using Ensembl genomic browser, release 89 to screen for variants located within regulatory regions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>To date, 28 variants of the <jats:italic>EPOR<\/jats:italic> and seven variants of the <jats:italic>EPO<\/jats:italic> gene have been associated with erythrocytosis or upper hematocrit. Sequence variants were also found to be present within regulatory regions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Role of variants in regulatory regions of the <jats:italic>EPO<\/jats:italic> gene should be further investigated.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ijlh.12949","type":"journal-article","created":{"date-parts":[[2018,12,3]],"date-time":"2018-12-03T10:05:23Z","timestamp":1543831523000},"page":"162-167","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Genetic variants of erythropoietin (<i>EPO<\/i>) and EPO receptor genes in familial erythrocytosis"],"prefix":"10.1111","volume":"41","author":[{"given":"Danijela","family":"Vo\u010danec","sequence":"first","affiliation":[{"name":"Department of Animal Science Biotechnical Faculty University of Ljubljana Ljubljana Slovenia"},{"name":"Institute of Biochemistry, Faculty of Medicine University of Ljubljana Ljubljana 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