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Mutations in the protein induce nephrogenic diabetes insipidus (NDI), which challenges the water balance by producing large urinary volumes. Although recessive AQP2 mutations are believed to generate non-functional and monomeric proteins, the literature identifies several mild mutations which suggest the existence of mixed wt\/mut tetramers likely to carry function in heterozygotes. Using <jats:italic>Xenopus<\/jats:italic> oocytes, we tested this hypothesis and found that mild mutants (V24A, D150E) can associate with <jats:italic>wt<\/jats:italic>-AQP2 in mixed heteromers, providing clear functional gain in the process (62\u2009\u00b1\u200917% and 63\u2009\u00b1\u200917% increases, respectively), conversely to the strong monomeric R187C mutant which fails to associate with <jats:italic>wt<\/jats:italic>-AQP2. In kidney cells, both V24A and D150E display restored targeting while R187C remains in intracellular stores. Using a collection of mutations to expand recovery analyses, we demonstrate that inter-unit contacts are central to this recovery process. These results not only present the ground data for the functional recovery of recessive AQP2 mutants through heteromerization, which prompt to revisit the accepted NDI model, but more importantly describe a general recovery process that could impact on all multimeric systems where recessive mutations are found.<\/jats:p>","DOI":"10.1038\/srep33298","type":"journal-article","created":{"date-parts":[[2016,9,19]],"date-time":"2016-09-19T09:51:09Z","timestamp":1474278669000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Functional Recovery of AQP2 Recessive Mutations Through Hetero-Oligomerization with Wild-Type Counterpart"],"prefix":"10.1038","volume":"6","author":[{"given":"Abdulah","family":"El Tarazi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoann","family":"Lussier","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sandra","family":"Da Cal","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pierre","family":"Bissonnette","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel G.","family":"Bichet","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2016,9,19]]},"reference":[{"key":"BFsrep33298_CR1","doi-asserted-by":"publisher","first-page":"7212","DOI":"10.1073\/pnas.92.16.7212","volume":"92","author":"T Katsura","year":"1995","unstructured":"Katsura, T. et al. 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