title: Multiple endocrine neoplasia type 1 interacts with forkhead transcription factor CHES1 in DNA damage response.
abstract: Multiple endocrine neoplasia type 1 (MEN1) is a cancer susceptibility syndrome affecting several endocrine tissues. Investigations of the biochemical function of the MEN1 protein, menin, have suggested a role as a transcriptional comodulator. The mechanism by which MEN1 inactivation leads to tumor formation is not fully understood. MEN1 was implicated to function in both regulation of cell proliferation and maintenance of genomic integrity. Here, we investigate the mechanism by which MEN1 affects DNA damage response. We found that Drosophila larval tissue and mouse embryonic fibroblasts mutant for the MEN1 homologue were deficient for a DNA damage-activated S-phase checkpoint. The forkhead transcription factor CHES1 (FOXN3) was identified as an interacting protein by a genetic screen, and overexpression of CHES1 restored both cell cycle arrest and viability of MEN1 mutant flies after ionizing radiation exposure. We showed a biochemical interaction between human menin and CHES1 and showed that the COOH terminus of menin, which is frequently mutated in MEN1 patients, is necessary for this interaction. Our data indicate that menin is involved in the activation of S-phase arrest in response to ionizing radiation. CHES1 is a component of a transcriptional repressor complex, that includes mSin3a, histone deacetylase (HDAC) 1, and HDAC2, and it interacts with menin in an S-phase checkpoint pathway related to DNA damage response.
authors.affiliation: Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA.
authors.forename: Valeria
authors.initials: V
authors.lastname: Busygina
authors.forename: Molly C
authors.initials: MC
authors.lastname: Kottemann
authors.forename: Kenneth L
authors.initials: KL
authors.lastname: Scott
authors.forename: Sharon E
authors.initials: SE
authors.lastname: Plon
authors.forename: Allen E
authors.initials: AE
authors.lastname: Bale
mesh_terms: D000818:Animals; D018797:Cell Cycle Proteins / Q000235:genetics* / Q000378:metabolism; D002455:Cell Division; D002460:Cell Line; D004249:DNA Damage; D004273:DNA, Neoplasm / Q000235:genetics*; D029721:Drosophila Proteins / Q000235:genetics; D004331:Drosophila melanogaster / Q000235:genetics; D051858:Forkhead Transcription Factors; D016195:G2 Phase; D006801:Humans; D007814:Larva; D018761:Multiple Endocrine Neoplasia Type 1 / Q000235:genetics* / Q000473:pathology; D011518:Proto-Oncogene Proteins / Q000235:genetics* / Q000378:metabolism; D011994:Recombinant Proteins / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics* / Q000378:metabolism; D014162:Transfection
chemical_list: D018797:Cell Cycle Proteins; D004273:DNA, Neoplasm; D029721:Drosophila Proteins; C106158:FOXN3 protein, human; D051858:Forkhead Transcription Factors; C105373:MEN1 protein, human; C499857:Mnn1 protein, Drosophila; D011518:Proto-Oncogene Proteins; D011994:Recombinant Proteins; D012097:Repressor Proteins