Project description:<p>In this study, we characterized the genomic landscape of tuberous sclerosis complex (TSC), a rare genetic disease causing multisystem growth of benign tumors and other hamartomatous lesions. We analyzed 127 human tissues, including 111 TSC-associated samples and 16 non-TSC negative controls, using multiple genomic platforms including whole exome sequencing, targeted sequencing of known disease-causative loci (<i>TSC1</i> and <i>TSC2</i>), mRNA sequencing, high-density SNP arrays, and DNA methylation arrays.</p>
Project description:Chordoma associated with tuberous sclerosis complex (TSC) are an extremely rare tumor that was described only in 13 cases since 1975. Сhordomas themselves are malignant slow-growing bone tumors thought to arise from vestigial or ectopic notochordal tissue. In total, with CMA we found 180 regions with CNVs in the chordoma tumor sample. The longest section was 58,014 kbp long (arr[GRCh38] 9q21.31q34.3(79267492_137281464)x1-2), harboring region 9q34 that includes TSC1 gene. Also, 12 oncogenes including KRAS and CBX7 were in amplified regions and 92 tumor suppressor genes were in regions with loss status. Four genes that participate in epigenetic regulation, - ELP3, GTF3C4, MBD2, and PHF2 were found to be affected. Moreover, members of the APOBEC3 family were amplified.
Project description:The aim of the study is to investigate the role and mechanisms of tuberous sclerosis complex 1 (TSC1) and mechanistic target of rapamycin complex 1 (mTORC1) in alcohol associated liver disease Hepatic RNA profiles of WT and hepatic TSC1 KO mice fed with alcohol or control diet using Gao binge alcohol model.
Project description:Tuberous sclerosis complex (TSC) is a rare genetic disease causing multisystem growth of benign tumours and other hamartomatous lesions, which leads to diverse and debilitating clinical symptoms. Patients are born with TSC1 or TSC2 mutations, and somatic inactivation of wild-type alleles drives MTOR activation; however, second hits to TSC1/TSC2 are not always observed. Here, we present the genomic landscape of TSC hamartomas. We determine that TSC lesions contain a low somatic mutational burden relative to carcinomas, a subset feature large-scale chromosomal aberrations, and highly conserved molecular signatures for each type exist. Analysis of the molecular signatures coupled with computational approaches reveals unique aspects of cellular heterogeneity and cell origin. Using immune data sets, we identify significant neuroinflammation in TSC-associated brain tumours. Taken together, this molecular catalogue of TSC serves as a resource into the origin of these hamartomas and provides a framework that unifies genomic and transcriptomic dimensions for complex tumours.
Project description:Tuberous sclerosis complex (TSC), an autosomal dominant disorder caused by mutations in either TSC1 or TSC2, exhibits white matter abnormalities including CNS myelin deficits. however, underlying mechanisms are not fully understood. Here we find that, unexpectedly, constitutive activation of mTOR signaling caused by Tsc1 deletion in the oligodendrocyte lineage results in severe myelination defects and oligodendrocyte cell death. Expression profiling analysis reveals that Tsc1 ablation induces prominent endoplasmic reticulum (ER) stress responses through the PERKâeIF2α dependent signaling axis and activates Fas-JNK apoptotic pathways. Our studies suggest that TSC1-mTOR signaling acts as an important checkpoint for maintaining oligodendrocyte homeostasis. Gene expression profiling of optic nerve from P12 control and Tsc1cKO mice
Project description:The mechanisms that regulate T cell quiescence are poorly understood. We report that tuberous sclerosis complex 1 (Tsc1) establishes a quiescent program in naïve T cells by controlling cell size, cell cycle entry, and responses to T cell receptor stimulation. Loss of quiescence predisposed Tsc1-deficient T cells to apoptosis that depleted conventional T cells and invariant natural killer T cells. Loss of Tsc1 function dampened in vivo immune responses to bacterial infection. Tsc1-deficient T cells exhibited increased mTORC1 but diminished mTORC2 activities, with mTORC1 activation essential for the disruption of immune homeostasis. Therefore, Tsc1-dependent control of mTOR is crucial in establishing naïve T cell quiescence to facilitate adaptive immune function. Naïve CD4 and CD8 T cells from wild-type and Tsc1-deficient mice (in triplicates each group) were stimulated with or without TCR signaling. RNA was analyzed by microarrays. WT/KO for 0 and 4 hr for CD4 (triplicates), and WT/KO for 0 hr for CD8 (duplicates).