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These alterations were associated with a poor prognosis and resistance to therapy. Nearly all amino acid substitutions are localized in two major clusters, affecting either the N-terminal region (Nt mutations) or the forkhead DNA-binding domain (DBD mutations). While recent studies have focused on Nt mutations, we characterized FOXO1 DBD mutants. We analyzed their transcriptional activity, DNA binding, phosphorylation and protein\u2013protein interaction. The majority of DBD mutants showed a decrease in activity and DNA binding, while preserving AKT phosphorylation and interaction with the cytoplasmic ATG7 protein. In addition, we investigated the importance of conserved residues of the \u03b1-helix 3 of the DBD. Amino acids I213, R214, H215 and L217 appeared to be crucial for FOXO1 activity. Our data underlined the key role of multiple amino-acid residues of the forkhead domain in FOXO1 transcriptional activity and revealed a new type of FOXO1 loss-of-function mutations in B-cell lymphoma.<\/jats:p>","DOI":"10.1038\/s41598-022-05334-4","type":"journal-article","created":{"date-parts":[[2022,1,25]],"date-time":"2022-01-25T11:03:10Z","timestamp":1643108590000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["FOXO1 forkhead domain mutants in B-cell lymphoma lack transcriptional activity"],"prefix":"10.1038","volume":"12","author":[{"given":"Ariane","family":"Sablon","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emeline","family":"Bollaert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Constance","family":"Pirson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Am\u00e9lie I.","family":"Velghe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jean-Baptiste","family":"Demoulin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,1,25]]},"reference":[{"issue":"6","key":"5334_CR1","doi-asserted-by":"publisher","first-page":"857","DOI":"10.1016\/S0092-8674(00)80595-4","volume":"96","author":"A Brunet","year":"1999","unstructured":"Brunet, A. et al. 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