{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T17:33:48Z","timestamp":1787592828013,"version":"build-2736575974"},"reference-count":44,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2011,4,18]],"date-time":"2011-04-18T00:00:00Z","timestamp":1303084800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["pathsocjournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Journal of Pathology"],"published-print":{"date-parts":[[2011,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>FBXW7 is the substrate recognition component of a SCF\u2010type E3 ubiquitin ligase. It has multiple targets such as Notch1, c\u2010Jun, and cyclin E that function in critical developmental and signalling pathways. Mutations in <jats:italic>FBXW7<\/jats:italic> are often found in many types of cancer. In most cases, these mutations do not inactivate the protein, but are mono\u2010allelic missense changes at specific arginine resides involved in substrate binding. We have hypothesized that <jats:italic>FBXW7<\/jats:italic> mutations are selected in cancers for reasons other than haploinsufficiency or full loss\u2010of\u2010function. Given that the existing mutant <jats:italic>Fbxw7<\/jats:italic> mice carry null alleles, we created a mouse model carrying one of the commonly occurring point mutations (<jats:italic>Fbxw7<\/jats:italic><jats:styled-content>$^{R482{\\rm{Q}}}$<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-ueqn-1.gif\" xlink:title=\"equation image\"\/><\/jats:styled-content>) in the WD40 substrate recognition domain of Fbxw7. Mice heterozygous for this mutation apparently developed normally <jats:italic>in utero<\/jats:italic>, died perinatally due to a defect in lung development, and in some cases showed cleft palate and eyelid fusion defects. By comparison, <jats:italic>Fbxw7<\/jats:italic><jats:sup>+\/\u2212<\/jats:sup> mice were viable and developed normally. <jats:italic>Fbxw7<\/jats:italic><jats:sup>\u2212\/\u2212<\/jats:sup> animals died of vascular abnormalities at E10.5. We screened known FBXW7 targets for changes in the lungs of the <jats:italic>Fbxw7<\/jats:italic><jats:sup><jats:italic>R<\/jats:italic>482<jats:italic>Q<\/jats:italic>\/+<\/jats:sup> mice and found Tgif1 and Klf5 to be up\u2010regulated. <jats:italic>Fbxw7<\/jats:italic><jats:styled-content>$^{R482{\\rm{Q}}}$<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-ueqn-2.gif\" xlink:title=\"equation image\"\/><\/jats:styled-content> alleles are not functionally equivalent to heterozygous or homozygous null alleles, and we propose that they are selected in tumourigenesis because they cause a selective or partial loss of FBXW7 function. Copyright \u00a9 2011 Pathological Society of Great Britain and Ireland. Published by John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/path.2874","type":"journal-article","created":{"date-parts":[[2011,2,18]],"date-time":"2011-02-18T10:00:52Z","timestamp":1298023252000},"page":"180-189","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["<i>FBXW7<\/i> mutations typically found in human cancers are distinct from null alleles and disrupt lung 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