Project description:Deficiency in Krüppel-like zinc finger transcription factor, GLI-Similar 3 (GLIS3) in humans is associated with the development of congenital hypothyroidism. However, the functions of GLIS3 in the thyroid gland and by what mechanism GLIS3-dysfunction causes hypothyroidism are unknown. In this study, we demonstrate that GLIS3 acts downstream of thyroid stimulating hormone (TSH)/TSHR and is indispensable for TSH/TSHR-mediated induction of thyroid follicular cell proliferation and thyroid hormone biosynthesis. ChIP-Seq and promoter analysis revealed that GLIS3 is critical for the transcriptional activation of several genes required for thyroid hormone biosynthesis, including the iodide transporters Nis and Pds, indicating that these genes are directly regulated by GLIS3. The repression of cell proliferation regulatory genes is due to the inhibition of TSH-mediated activation of the mTORC1/RPS6 pathway as well as direct transcriptional regulation of several cell division-related genes by GLIS3. Consequently, GLIS3-deficiency prevents the development of goiter as well as the induction of inflammatory and fibrotic genes during chronic elevation of circulating TSH. Our study identifies GLIS3 as a new and key regulator of TSH/TSHR-mediated thyroid hormone biosynthesis and proliferation of thyroid follicular cells, and uncovers a mechanism by which GLIS3-deficiency causes congenital hypothyroidism and prevents goiter development.
Project description:Loss of transcription factor GLIS3 function in humans and mice leads to the development of neonatal polycystic kidney disease (PKD). To investigate how loss of GLIS3 function in kidney affects postnatal kidney development and PKD, we analyzed the gene expression profiles of kidneys from WT and Glis3-null mice at P7, P14, and P28 by RNA-Seq analysis using Glis3 global KO model Glis3-mCherry.
Project description:Loss of transcription factor GLIS3 function in humans and mice leads to the development of neonatal polycystic kidney disease (PKD). To investigate how loss of GLIS3 function in kidney affects postnatal kidney development and PKD, we analyzed the gene expression profiles of kidneys from WT and Glis3-null mice at P7, P14, and P28 by RNA-Seq analysis using Glis3 global KO model Glis3-mCherry and kidney specific knockout model Glis3-PAX8Cre.
Project description:The expression of Glis3 in C3H10T1/2 cells promotes osteoblastic differentiation as indicated by the the induction of increase in alkaline phosphatase activity, an early marker of osteoblast differentiation, and increased expression of osteopontin, a late marker of osteogenesis. Glis3 acts synergistically with bone morphogenic protein 2 (BMP-2). In contrast, expression of Glis3 inhibits the induction of adipocyte differentiation. Microarray analysis identified the fibroblast growth factor 18 (FGF18) as one of the genes induced by Glis3 in C3H10T1/2 cells directly. Keywords: Glis3, osteoblast differentiation, adipocyte differentiation, FGF18, BMP2
Project description:The serum hormone levels including T3 and T4 were dramatically decreased in Glis3-null mice due to reduced production of thyroid hormones in thyroid. Gene expression profile and EdU incorporation analysis between WT and Glis3-null mice showed that the cell proliferation was greatly reduced in Glis3-null thyroid. Goitergenic diet (low iodine diet; LID) dramatically enhanced serum TSH levels in both WT and Glis3-null mice, however thyroid goiter was observed in WT mice but not in Glis3-null mice. A subset of genes associated with thyroid hormone production including Pendrin (Slc26a4), Nis (Na+/I– symporter, Slc5a5), Duoxa2 (dualoxidase A2), Tpo (thyroperoxidase), and Dio1 (Deiodinase1) was significantly induced in WT but not in Glis3-null mice by LID feeding.
Project description:The goals of this study are to utilize high-throughput transcriptome sequencing of mutant and control fetal testis samples to identify changes in both transcript and repeat element abundance in tissues harboring a homozygous mutation for Glis3. 672 unique genes were differentially expressed in mutant versus wild-type samples. Of the downregulated genes, there was a strong enrichment for piRNA pathway members, while upregulated genes were associated with leydig cell differentiation, meiosis, and histone cluster genes. Differential expression of several repeat elements was also detected in mutant samples. Our findings provide valuable information on the potential mechanisms underlying the fetal germ cell loss observed in Glis3 mutant testes. Whole testis mRNA profiles of embryonic day 14.5 wild type (WT) and Glis3 mutant mice were generated by deep sequencing, using Illumina HiSeq2500