title: EAK-7 controls development and life span by regulating nuclear DAF-16/FoxO activity.
abstract: FoxO transcription factors control development and longevity in diverse species. Although FoxO regulation via changes in its subcellular localization is well established, little is known about how FoxO activity is regulated in the nucleus. Here, we show that the conserved C. elegans protein EAK-7 acts in parallel to the serine/threonine kinase AKT-1 to inhibit the FoxO transcription factor DAF-16. Loss of EAK-7 activity promotes diapause and longevity in a DAF-16/FoxO-dependent manner. Whereas akt-1 mutation activates DAF-16/FoxO by promoting its translocation from the cytoplasm to the nucleus, eak-7 mutation increases nuclear DAF-16/FoxO activity without influencing DAF-16/FoxO subcellular localization. Thus, EAK-7 and AKT-1 inhibit DAF-16/FoxO activity via distinct mechanisms. Our results implicate EAK-7 as a FoxO regulator and highlight the biological impact of a regulatory pathway that governs the activity of nuclear FoxO without altering its subcellular location.
authors.affiliation: Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: Hena
authors.initials: H
authors.lastname: Alam
authors.forename: Travis W
authors.initials: TW
authors.lastname: Williams
authors.forename: Kathleen J
authors.initials: KJ
authors.lastname: Dumas
authors.forename: Chunfang
authors.initials: C
authors.lastname: Guo
authors.forename: Sawako
authors.initials: S
authors.lastname: Yoshina
authors.forename: Shohei
authors.initials: S
authors.lastname: Mitani
authors.forename: Patrick J
authors.initials: PJ
authors.lastname: Hu
mesh_terms: D000818:Animals; D017173:Caenorhabditis elegans; D029742:Caenorhabditis elegans Proteins / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D051858:Forkhead Transcription Factors / Q000378:metabolism*; D008136:Longevity; D009154:Mutation; D051057:Proto-Oncogene Proteins c-akt / Q000235:genetics / Q000378:metabolism; D034622:RNA Interference; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D029742:Caenorhabditis elegans Proteins; D002352:Carrier Proteins; D051858:Forkhead Transcription Factors; D014157:Transcription Factors; C108831:daf-16 protein, C elegans; D051057:Proto-Oncogene Proteins c-akt; C494915:akt-1 protein, C elegans