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Concomitant deletions of tumor suppressor genes MEN1 and AIP are essential for the pathogenesis of the brown fat tumor hibernoma

ABSTRACT: Hibernomas are benign tumors with morphological features resembling brown fat. They consistently display cytogenetic rearrangements, typically translocations, involving chromosome band 11q13. Here we demonstrate that these aberrations are associated with concomitant deletions of AIP and MEN1, tumor suppressor genes that are located 3 Mb apart and that underlie the hereditary syndromes pituitary adenoma predisposition and multiple endocrine neoplasia type I. MEN1 and AIP displayed a low expression in hibernomas whereas the expression of genes up-regulated in brown fat-PPARA, PPARG, PPARGC1A, and UCP1-was high. Thus, loss of MEN1 and AIP is likely to be pathogenetically essential for hibernoma development. Simultaneous loss of two tumor suppressor genes has not previously been shown to result from a neoplasia-associated translocation. Furthermore, in contrast to the prevailing assumption that benign tumors harbor relatively few genetic aberrations, the present analyses demonstrate that a considerable number of chromosome breaks are involved in the pathogenesis of hibernoma.

ORGANISM(S): Homo sapiens

PROVIDER: GSE19040 | GEO | 2010/11/24

SECONDARY ACCESSION(S): PRJNA121069

REPOSITORIES: GEO

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Concomitant deletions of tumor suppressor genes MEN1 and AIP are essential for the pathogenesis of the brown fat tumor hibernoma

Project description:Hibernomas are benign tumors with morphological features resembling brown fat. They consistently display cytogenetic rearrangements, typically translocations, involving chromosome band 11q13. Here we demonstrate that these aberrations are associated with concomitant deletions of AIP and MEN1, tumor suppressor genes that are located 3 Mb apart and that underlie the hereditary syndromes pituitary adenoma predisposition and multiple endocrine neoplasia type I. MEN1 and AIP displayed a low expression in hibernomas whereas the expression of genes up-regulated in brown fat-PPARA, PPARG, PPARGC1A, and UCP1-was high. Thus, loss of MEN1 and AIP is likely to be pathogenetically essential for hibernoma development. Simultaneous loss of two tumor suppressor genes has not previously been shown to result from a neoplasia-associated translocation. Furthermore, in contrast to the prevailing assumption that benign tumors harbor relatively few genetic aberrations, the present analyses demonstrate that a considerable number of chromosome breaks are involved in the pathogenesis of hibernoma. Global copy number analysis was performed using single nucleotide polymorphism (SNP) array. Cases 1-14 were hybridized onto Illumina Human1M-Duo v3.0 (and Human CNV370-Quad v3.0) BeadChip (Illumina, San Diego, CA, USA), following standard protocols supplied by the manufacturer. Case 15 was analyzed using Illumina Human Omni-Quad BeadChip. Normal blood DNA was analyzed in cases 1, 2, 4 and 6 using the Human CNV370-Quad v3.0 BeadChip. Data analysis was done using the BeadStudio software (Illumina).

2010-11-24 | E-GEOD-19040 | biostudies-arrayexpress

Loss of the tumor suppressor gene AIP mediates the browning of human brown fat tumors

Project description:Human brown fat tumors (hibernomas) display concomitant loss of the tumor suppressor genes MEN1 and AIP. In the present study, we hypothesized that the brown fat phenotype is attributed to these mutations. Accordingly, we demonstrate that silencing of AIP in human brown preadipocytic and white fat cell lines results in the induction of the brown fat marker UCP1. In human adipocytic tumors, loss of MEN1 was found both in white (one out of 51 lipomas) and brown fat tumors. In contrast, concurrent loss of AIP was always accompanied by a brown fat morphology. We conclude that this white-to-brown phenotype switch in brown fat tumors is mediated by the loss of AIP.

2017-08-10 | GSE61093 | GEO

Homo sapiens

Project description:Concomitant deletions of tumor suppressor genes MEN1 and AIP are essential for the pathogenesis of the brown fat tumor hibernoma

| PRJNA121069 | ENA

AIP inactivation leads to pituitary tumorigenesis through defective Gαi-cAMP signaling

Project description:Gene-level expression profiles of 7 Aip knock-out (triplicates from each) and 9 Aip wild-type mouse embryonic fibroblast cell lines were studied using Affymetrix GeneChip Mouse Exon 1.0 ST Arrays

2014-03-05 | GSE37927 | GEO

NHGRI Menin ChIP-Chip

Project description:Multiple endocrine neoplasia type I (MEN1) is a familial cancer syndrome characterized primarily by tumors of multiple endocrine glands. The gene for MEN1 encodes a ubiquitously expressed tumor suppressor protein called menin. Menin was recently shown to interact with several components of a trithorax family histone methyltransferase complex including ASH2, Rbbp5, WDR5, and the leukemia proto-oncoprotein MLL. To elucidate menin's role as a tumor suppressor and gain insights into the endocrine-specific tumor phenotype in MEN1, we mapped the genomic binding sites of menin, MLL1, and Rbbp5, to approximately 20,000 promoters in HeLa S3, HepG2, and pancreatic islet cells using the strategy of chromatin-immunoprecipitation coupled with microarray analysis. We found that menin, MLL1, and Rbbp5 localize to the promoters of thousands of human genes but do not always bind together. These data suggest that menin functions as a general regulator of transcription. Keywords: ChIP/chip NHGRI Menin ChIP-Chip

2006-07-24 | E-GEOD-5357 | biostudies-arrayexpress

Homo sapiens

Project description:Loss of the tumor suppressor gene AIP mediates the browning of human brown fat tumors

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Trophoblast epithelial-mesenchymal transition (EMT) in abnormally invasive placenta (AIP)

Project description:Comparison of genes associated with the EMT between cytotrophoblast cells (CTB) and extravillous trophoblast cells (EVT) from normal third trimester placenta and abnormally invasive placenta (AIP)

2018-01-01 | GSE104350 | GEO

Identification of distinct molecular signatures in AIP mutation-positive familial isolated pituitary adenomas

Project description:The aim of this study was to perform comparative gene expression analysis of AIP mutation-positive, AIP mutation-negative familial and sporadic somatotroph tumours to discover the genes/pathways responsible for the aggressive phenotype. Gene expression analysis was performed on 25 pituitary samples (five normal pituitary, six AIPpos GH, three AIPneg GH, four sporadic GH, two AIPneg familial NFPA and five sporadic NFPA adenomas) using the Affymetrix human Gene Chip HG-U133 Plus 2.0 array.

2018-04-13 | GSE63357 | GEO

Pedigree Study and Functional Analysis of Novel Germline p. R21Afs MEN1 Mutation in a Multiple Endocrine Neoplasia Type 1 Family

Project description:We found a novel MEN1 p. R21Afs mutaion in a multiple endocrine neoplasia type 1 family. To investigate the pathogenic function of p.R21Afs MEN1 mutation, the leukocyte transcriptoma profilings derived from MEN1 patients with heterozygote p.R21Afs MEN1 mutation was compared with the unaffected relatives without p.R21Afs MEN1 mutation.

2023-02-01 | GSE221993 | GEO

Differentially regulated genes in adipocytes derived from Men1-null vs WT mouse embryonic stem cells

Project description:MEN1 is a tumor suppressor gene loss of which causes lipoma (fatty tumors under the skin) and many other endocrine and non-endocrine tumors. It's target genes in fat cells (adipocytes) are unknown. Gene expression in adipocytes that were in vitro differentiated from mouse embryonic stem cells (mESCs) of Men1-nul l(Men1-KO) and WT mice were compared to assess the expression of genes upon menin loss in adipocytes that could lead to the deveopment of lipoma. mESCs (Men1-null and WT) were in vitro differentaited into adipocytes. Positive oil red O staining indicated successful differentiation into adipocytes. The cells were processed for RNA isolation. RNA preps were used for microarray analysis.

2016-02-03 | E-GEOD-65859 | biostudies-arrayexpress

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