A Knock-in Mouse Model of Thymoma with the GTF2I L424H Mutation
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PROVIDER: PRJNA826811 | ENA |
REPOSITORIES: ENA
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Project description:We previously identified a recurrent mutation L424H in the transcription factor GTF2I in thymic epithelial tumors. The precise role of the GTF2I mutation in these tumors is unclear. Here we describe the generation and characterization of a mouse model in which the Gtf2i L424H mutation was conditionally knocked-in in the Foxn1+ thymic epithelial cells. The Gtf2i mutation impairs development of thymic medulla and maturation of medullary thymic epithelial cells in the young mice and causes tumor formation in the thymus of the aged KI mice. To characterize the molecular features of murine thymomas, we performed digital spatial profiling with GeoMx moue whole transcriptome atlas assay with FFPE thymic tissues of 4 KI and 4 control mice.
2023-01-25 | GSE200784 | GEO
Project description:IntroductionThe pathogenesis of thymic epithelial tumors remains largely unknown. We previously identified GTF2I L424H as the most frequently recurrent mutation in thymic epithelial tumors. Nevertheless, the precise role of this mutation in tumorigenesis of thymic epithelial cells is unclear.MethodsTo investigate the role of GTF2I L424H mutation in thymic epithelial cells in vivo, we generated and characterized a mouse model in which the Gtf2i L424H mutation was conditionally knocked-in in the Foxn1+ thymic epithelial cells. Digital spatial profiling was performed on thymomas and normal thymic tissues with GeoMx-mouse whole transcriptome atlas. Immunohistochemistry staining was performed using both mouse tissues and human thymic epithelial tumors.ResultsWe observed that the Gtf2i mutation impairs development of the thymic medulla and maturation of medullary thymic epithelial cells in young mice and causes tumor formation in the thymus of aged mice. Cell cycle-related pathways, such as E2F targets and MYC targets, are enriched in the tumor epithelial cells. Results of gene set variation assay analysis revealed that gene signatures of cortical thymic epithelial cells and thymic epithelial progenitor cells are also enriched in the thymomas of the knock-in mice, which mirrors the human counterparts in The Cancer Genome Atlas database. Immunohistochemistry results revealed similar expression pattern of epithelial cell markers between mouse and human thymomas.ConclusionsWe have developed and characterized a novel thymoma mouse model. This study improves knowledge of the molecular drivers in thymic epithelial cells and provides a tool for further study of the biology of thymic epithelial tumors and for development of novel therapies.
| S-EPMC9691559 | biostudies-literature
Project description:The molecular mechanisms underlying the pathogenesis of TETs are poorly understood. Recently we reported a common missense mutation on GTF2I gene in thymic tumors and hypothesized that GTF2I mutation might contribute to thymic tumorigenesis. Expression of mutant TFII-I altered the transcriptome of thymic epithelial cells and up-regulated several oncogenic genes. Using CRISPR/Cas9n, Gtf2i T1211A knock-in cells exhibited distinct features of cancerous cells including cell transformation, aneuploidy, tumor growth in xenograft, and survival after DNA damage or glucose deprivation. We also observed that Gtf2i mutation increased the expression of several glycolytic enzymes, cyclooxygenase-2, and altered lipid metabolism. Elevated COX-2 expression by Gtf2i mutation was required for survival under metabolic stress and cellular transformation of thymic epithelial cells. Our findings identify GTF2I mutation as a new oncogenic driver mutation that is responsible for transformation of thymic epithelial cells.
2022-03-02 | GSE127907 | GEO
Project description:The molecular mechanisms underlying the pathogenesis of TETs are poorly understood. Recently we reported a common missense mutation on GTF2I gene in thymic tumors and hypothesized that GTF2I mutation might contribute to thymic tumorigenesis. Expression of mutant TFII-I altered the transcriptome of thymic epithelial cells and up-regulated several oncogenic genes. Using CRISPR/Cas9n, Gtf2i T1211A knock-in cells exhibited distinct features of cancerous cells including cell transformation, aneuploidy, tumor growth in xenograft, and survival after DNA damage or glucose deprivation. We also observed that Gtf2i mutation increased the expression of several glycolytic enzymes, cyclooxygenase-2, and altered lipid metabolism. Elevated COX-2 expression by Gtf2i mutation was required for survival under metabolic stress and cellular transformation of thymic epithelial cells. Our findings identify GTF2I mutation as a new oncogenic driver mutation that is responsible for transformation of thymic epithelial cells.
2022-03-02 | GSE127908 | GEO
Project description:Next generation sequencing of 28 thymic epithelial tumors (TETs) revealed a high frequency of GTF2I missense mutation (chr7:74146970T/A) in A thymomas, a relatively indolent subtype. The GTF2I mutation was confirmed in 82% of A and 74% of AB thymomas in a series of 274 TETs but was rare in aggressive subtypes, where recurrent mutations of known cancer genes were identified. Therefore, GTF2I mutation correlated with a better survival. GTF2I Beta and Delta isoforms were expressed in TETs and both mutant isoforms were able to stimulate cell proliferation in vitro. Thymic carcinomas presented a higher number of mutations than thymomas (average 43.5 and 18.4, respectively). Recurrent mutations of known cancer genes, including TP53, CYLD, CDKN2A, BAP1 and PBRM1 were identified in thymic carcinomas. These findings will complement the diagnostic work up of these rare tumors, and also help the development of a molecular classification, and assessment of prognosis and treatment strategies. Tumor samples of 286 patients were collected from 4 different institutions: National Cancer Institute (Bethesda MD), Pisa University Hospital (Pisa, Italy), Padua University Hospital (Padua, Italy) and IRCCS Istituto Clinico Humanitas (Rozzano, Italy).
2014-06-24 | E-GEOD-57892 | biostudies-arrayexpress
Project description:Next generation sequencing of 28 thymic epithelial tumors (TETs) revealed a high frequency of GTF2I missense mutation (chr7:74146970T/A) in A thymomas, a relatively indolent subtype. The GTF2I mutation was confirmed in 82% of A and 74% of AB thymomas in a series of 274 TETs but was rare in aggressive subtypes, where recurrent mutations of known cancer genes were identified. Therefore, GTF2I mutation correlated with a better survival. GTF2I Beta and Delta isoforms were expressed in TETs and both mutant isoforms were able to stimulate cell proliferation in vitro. Thymic carcinomas presented a higher number of mutations than thymomas (average 43.5 and 18.4, respectively). Recurrent mutations of known cancer genes, including TP53, CYLD, CDKN2A, BAP1 and PBRM1 were identified in thymic carcinomas. These findings will complement the diagnostic work up of these rare tumors, and also help the development of a molecular classification, and assessment of prognosis and treatment strategies.
2014-06-24 | GSE57892 | GEO
Project description:The pathogenesis of thymic epithelial tumors (TETs) is poorly understood. Recently we reported the frequent occurrence of a missense mutation in the GTF2I gene in TETs and hypothesized that GTF2I mutation might contribute to thymic tumorigenesis. Expression of mutant TFII-I altered the transcriptome of normal thymic epithelial cells and upregulated several oncogenic genes. Gtf2i L424H knockin cells exhibited cell transformation, aneuploidy, and increase tumor growth and survival under glucose deprivation or DNA damage. Gtf2i mutation also increased the expression of several glycolytic enzymes, cyclooxygenase-2, and caused modifications of lipid metabolism. Elevated cyclooxygenase-2 expression by Gtf2i mutation was required for survival under metabolic stress and cellular transformation of thymic epithelial cells. Our findings identify GTF2I mutation as a new oncogenic driver that is responsible for transformation of thymic epithelial cells.
2022-03-02 | GSE127909 | GEO
Project description:Effect of fumarase point mutation or knock-out on transcriptional profile in yeast to model hereditary leiomyomatosis and renal cell cancer (HLRCC).
2006-11-29 | E-MEXP-922 | biostudies-arrayexpress
Project description:Transcriptional profiling of mouse cortex tissue comparing control animals with Gtf2i-mutated mouse (Gtf2i+/Δex2 ). Goal was to determine the specific deregulated genes in the cortex of mutated animals.
2014-10-20 | GSE41251 | GEO
Project description:Data present the expression analysis of different mouse ES cell line with altered expression of GTF2I. We used microarrays to detail the global programme of gene expression underlying altered expression of GTF2I and identified distinct classes of deregulated genes
2013-07-12 | E-GEOD-48790 | biostudies-arrayexpress