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Several protocols have been published to differentiate pluripotent stem cells into RPE cells suitable for disease modelling and therapy development. In our study, the RPE identity of human induced pluripotent stem cell (hiPSC)-derived RPE\u00a0(iRPE) was extensively characterized, and then used to test a lentiviral-mediated <jats:italic>RPE65<\/jats:italic> gene augmentation therapy. A dose study of the lentiviral vector revealed a dose-dependent effect of the vector on <jats:italic>RPE65<\/jats:italic> mRNA levels. A marked increase of the <jats:italic>RPE65<\/jats:italic> mRNA was also observed in the iRPE (100-fold) as well as in an experimental set with RPE derived from another hiPSC source and from foetal human RPE. Although iRPE displayed features close to bona fide RPE, no or a modest increase of the RPE65 protein level was observed depending on the protein detection method. Similar results were observed with the two other cell lines. The mechanism of RPE65 protein regulation remains to be elucidated, but the current work suggests that high vector expression will not produce an excess of the normal RPE65 protein level.<\/jats:p>","DOI":"10.1038\/s41598-020-65657-y","type":"journal-article","created":{"date-parts":[[2020,6,1]],"date-time":"2020-06-01T10:03:14Z","timestamp":1591005794000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Lentiviral mediated RPE65 gene transfer in healthy hiPSCs-derived retinal pigment epithelial cells markedly increased RPE65 mRNA, but modestly protein level"],"prefix":"10.1038","volume":"10","author":[{"given":"Florian","family":"Udry","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah","family":"Decembrini","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David M.","family":"Gamm","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4475-9476","authenticated-orcid":false,"given":"Nicole","family":"D\u00e9glon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1006-9733","authenticated-orcid":false,"given":"Corinne","family":"Kostic","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yvan","family":"Arsenijevic","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,6,1]]},"reference":[{"key":"65657_CR1","doi-asserted-by":"publisher","first-page":"845","DOI":"10.1152\/physrev.00021.2004","volume":"85","author":"O Strauss","year":"2005","unstructured":"Strauss, O. 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