Identify changes in gene expression during overexpression of the glycosyltransferase LARGE
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE28932 | GEO | 2011/04/29
SECONDARY ACCESSION(S): PRJNA139883
REPOSITORIES: GEO
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Project description:alpha-dystroglycan is a component of the dystrophin associated glycoprotein complex that binds components of the extracellular matrix (including laminin, perlecan and neurexin) via its carbohydrate groups. Recently, a group of muscular dystrophies have been identified due to the aberrant glycosylation of this molecule (dystroglycanopathies). The overexpression of the glycosyltransferase LARGE in several cell lines results in alpha-dystroglycan hyperglycosylation and enhanced ligand binding. The glycan structures induced by LARGE overexpression are unknown. We have injected into mouse legs two LARGE constructs, one wild type and the second in which a DxD motif has been mutated to NNN as a control. We aim to identify genes unregulated during LARGE induced hyperglycosylation in order to gain insight into the enzymes involved in this process and ultimatley the nature of the glycans responsible for ligand binding. RNA preparations from two LARGE constructs, were sent to Microarray Core (E). One wild type and the second in which a DxD motif has been mutated to NNN as a control. The aim is to identify genes unregulated during LARGE induced hyperglycosylation in order to gain insight into the enzymes involved in this process and ultimatley the nature of the glycans responsible for ligand binding. The RNA was amplified, labeled, and hybridized to teh GLYCOv3 microarrays.
2011-04-29 | E-GEOD-28932 | biostudies-arrayexpress
Project description:Protein O-mannosylation is found in yeast and metazoans and a family of conserved orthologous polypeptide O-mannosyltransferases is believed to initiate this important posttranslational modification. We recently discovered that the large families of cadherins and protocadherins carry highly conserved O-Man glycans in specific EC domains, and it was suggested that the function of E-Cadherin was dependent on the O-Man glycans. Deficiencies in the two human polypeptide O-mannosyltransferases, POMT1 and T2, underlie a subgroup of congenital muscular dystrophies (CMD) designated α-dystroglycanopathies, because deficient O-Man glycans on -dystroglycan impair laminin interaction with -dystroglycan and the dystrophin complex. In order to explore the functions of O-Man glycans on cadherins and protocadherins we used a combinatorial gene editing strategy in multiple cell lines to evaluate to the role of the two POMTs initiation O-Man glycosylation and the major enzyme elongating O-Man glycans, the POMGNT1 2GlcNAc-transferase. Surprisingly, we discovered that O-Man glycans on cadherins and protocadherins do not appear to require POMT1 and T2 and moreover that the O-Man glycans on these proteins are not elongated in contrast to those on dystroglycan.
2017-05-18 | PXD004341 | Pride
Project description:Protein O-mannosylation is found in yeast and metazoans and a family of conserved orthologous polypeptide O-mannosyltransferases is believed to initiate this important posttranslational modification. We recently discovered that the large families of cadherins and protocadherins carry highly conserved O-Man glycans in specific EC domains, and it was suggested that the function of E-Cadherin was dependent on the O-Man glycans. Deficiencies in the two human polypeptide O-mannosyltransferases, POMT1 and T2, underlie a subgroup of congenital muscular dystrophies (CMD) designated α-dystroglycanopathies, because deficient O-Man glycans on -dystroglycan impair laminin interaction with -dystroglycan and the dystrophin complex. In order to explore the functions of O-Man glycans on cadherins and protocadherins we used a combinatorial gene editing strategy in multiple cell lines to evaluate to the role of the two POMTs initiation O-Man glycosylation and the major enzyme elongating O-Man glycans, the POMGNT1 2GlcNAc-transferase. Surprisingly, we discovered that O-Man glycans on cadherins and protocadherins do not appear to require POMT1 and T2 and moreover that the O-Man glycans on these proteins are not elongated in contrast to those on dystroglycan.
2017-05-18 | PXD004358 | Pride
Project description:In order to investigate glycosyltransferase enzyme GCNT3 function and to identify putative GCNT3 partners, regulators and/or downstream targets, we performed genomic analysis of GCNT3 overexpression in colon cancer cells. Data from three independent experiments were assayed in a whole genome microarray analysis. We compared patterns of global expression between GCNT3 and No ORF SW620 cells.
2017-06-12 | GSE88792 | GEO
Project description:Fukutin-related protein (FKRP) is a glycosyltransferase involved in glycosylation of alpha-dystroglycan (a-DG). Mutations in FKRP are associated with muscular dystrophies (MD) ranging from limb-girdle LGMDR9 to Walker-Warburg syndrome (WWS), a severe type of congenital MD. Although hypoglycosylation of a-DG is the main hallmark of this group of diseases, a full understanding of the underlying pathophysiology is still missing. Here, we investigated molecular mechanisms impaired by FKRP mutations in pluripotent stem (PS) cell-derived myotubes. FKRP deficient myotubes show transcriptome alterations in genes involved in extracellular matrix receptor interactions, calcium signaling, PI3K-Akt pathway, and lysosomal function. Accordingly, using a panel of patient-specific LGMDR9 and WWS induced PS cell-derived myotubes, we found a significant reduction in the autophagy-lysosome pathway for both disease phenotypes. Additionally, we show that WWS myotubes display decreased ERK1/2 activity and increased apoptosis, which were restored in gene edited myotubes. Our results suggest the autophagy-lysosome pathway and apoptosis may contribute to the FKRP-associated MD pathogenesis.
2021-10-19 | GSE178907 | GEO
Project description:Transgenic overexpression of Galgt2 in the skeletal muscles of mdx mice inhibits the development of disease pathology associated with muscular dystrophy. This is the case both in transgenic mice, where Galgt2 overexpression occurs from embryonic timepoints onward and in mdx mice where Galgt2 is overexpressed in the early postnatal period using Adeno-associated virus (AAV). Here, we use gene expression profiling to compare transcriptional changes resulting from embryonic and postnatal Galgt2 overexpression in mdx skeletal muscle. A surprising number of changes were in genes known to ameliorate muscular dystrophy when overexpressed (agrin, integrin alpha 7, ADAM12, Bcl2) or to cause muscular dystrophy when mutated (collagen VI (alpha1,alpha2), plectin 1, dystroglycan, selenoprotein N1, integrin alpha7, biglycan, dysferlin). Several genes involved in calcium homeostasis were also changed. In Galgt2 transgenic mice, where embryonic overexpression of Galgt2 in skeletal muscles alters neuromuscular development and muscle growth, the number of gene expression changes was vastly greater, however, 14% of genes altered in postnatal AAV-Galgt2 infected mdx muscles were also changed with embryonic overexpression. These experiments suggest that postnatal overexpression of Galgt2 inhibits muscular dystrophy in mdx mice via induction of a group of genes that, in aggregate, can govern membrane stability, membrane repair, calcium homeostasis, and apoptosis. Transgenic overexpression of Galgt2 in the skeletal muscles of mdx mice inhibits the development of disease pathology associated with muscular dystrophy. This is the case both in transgenic mice, where Galgt2 overexpression occurs from embryonic timepoints onward and in mdx mice where Galgt2 is overexpressed in the early postnatal period using Adeno-associated virus (AAV). Here, we use gene expression profiling to compare transcriptional changes resulting from embryonic and postnatal Galgt2 overexpression in mdx skeletal muscle. A surprising number of changes were in genes known to ameliorate muscular dystrophy when overexpressed (agrin, integrin alpha7, ADAM12, Bcl2) or to cause muscular dystrophy when mutated (collagen VI (alpha1,alpha2), plectin 1, dystroglycan, selenoprotein N1, integrin alpha7, biglycan, dysferlin). Several genes involved in calcium homeostasis were also changed. In Galgt2 transgenic mice, where embryonic overexpression of Galgt2 in skeletal muscles alters neuromuscular development and muscle growth, the number of gene expression changes was vastly greater, however, 14% of genes altered in postnatal AAV-Galgt2 infected mdx muscles were also changed with embryonic overexpression. These experiments suggest that postnatal overexpression of Galgt2 inhibits muscular dystrophy in mdx mice via induction of a group of genes that, in aggregate, can govern membrane stability, membrane repair, calcium homeostasis, and apoptosis. Experiment Overall Design: Microarrays were done in three groups at a time. 1) Transgenic Overexpression of Galgt2 - comprised to Wild Type (WT), Galgt2 Transgenic (CT), Dystrophin-Deficient (mdx), and Galgt2 Transgenic and Dystrophin-Deficient (CTmdx) each in duplicate 2) AAV-Mediated Galgt2 Gene Delivery in to the mdx gastrocnemius muscle in the postnatal period - comprised of AAVGalgt2 and PBS each in duplicate, and 3) Myoblasts and myotubes - comptised of one sample each of C1C12 myoblasts and myotubes, C2C12 myoblasts and myotubes stably transfected with Galgt2
2009-03-07 | E-GEOD-7863 | biostudies-arrayexpress
Project description:Many common human mesenchymal tumors, including gastrointestinal stromal tumor (GIST), rhabdomyosarcoma (RMS), and leiomyosarcoma (LMS), feature myogenic differentiation. Here we report that intragenic deletion of the dystrophin-encoding and muscular dystrophy-associated DMD gene is a frequent mechanism by which myogenic tumors progress to high-grade, lethal sarcomas. Dystrophin is expressed in nonneoplastic and benign counterparts for GIST, RMS and LMS, and the DMD deletions inactivate larger dystrophin isoforms, including 427kDa dystrophin, while preserving expression of an essential 71kDa isoform. Dystrophin inhibits myogenic sarcoma cell migration, invasion, anchorage independence, and invadopodia formation, and dystrophin inactivation was found in 96%, 100%, and 62% of metastatic GIST, embryonal RMS, and LMS, respectively. These findings validate dystrophin as a tumor suppressor and likely anti-metastatic factor, suggesting that therapies in development for muscular dystrophies may also have relevance in treatment of cancer. High molecular weight genomic DNA was isolated from 40 high-grade myogenic cancers (including 7 normal tissue/tumor pairs and 33 additional tumors) using QIAamp DNA Mini Kit (QIAGEN) and analyzed by Affymetrix 250K SNP array.
2014-05-02 | E-GEOD-53021 | biostudies-arrayexpress
Project description:Many common human mesenchymal tumors, including gastrointestinal stromal tumor (GIST), rhabdomyosarcoma (RMS), and leiomyosarcoma (LMS), feature myogenic differentiation. Here we report that intragenic deletion of the dystrophin-encoding and muscular dystrophy-associated DMD gene is a frequent mechanism by which myogenic tumors progress to high-grade, lethal sarcomas. Dystrophin is expressed in nonneoplastic and benign counterparts for GIST, RMS and LMS, and the DMD deletions inactivate larger dystrophin isoforms, including 427kDa dystrophin, while preserving expression of an essential 71kDa isoform. Dystrophin inhibits myogenic sarcoma cell migration, invasion, anchorage independence, and invadopodia formation, and dystrophin inactivation was found in 96%, 100%, and 62% of metastatic GIST, embryonal RMS, and LMS, respectively. These findings validate dystrophin as a tumor suppressor and likely anti-metastatic factor, suggesting that therapies in development for muscular dystrophies may also have relevance in treatment of cancer.
2014-05-02 | GSE53021 | GEO
Project description:Identify changes in gene expression during overexpression of the glycosyltransferase LARGE
| PRJNA139883 | ENA
Project description:Duchenne muscular dystrophy (DMD) is the most common fatal genetic disease. Clustered regularly interspaced short palindromic repeat (CRISPR)-mediated gene editing is a promising strategy for permanently curing DMD. In this study we developed a novel strategy for reframing DMD mutations by CRISPR-mediated large-scale excision of exons 46–54. We compared this approach to other DMD rescue strategies using DMD patient-derived primary muscle-derived stem cells (MDSCs) and found that it showed the highest efficiency in terms of restoring of dystrophin protein expression. We also confirmed that CRISPR from Prevotella and Francisella 1(Cpf1)-mediated genome editing could correct DMD mutation with higher specificity than CRISPR-associated protein 9 (Cas9). Furthermore, A patient-derived xenograft (PDX) DMD mouse model was established by transplanting DMD-MDSCs into immunodeficient mice. CRISPR gene editing components were intramuscularly delivered into the mouse model by adeno-associated virus vectors. Dystrophin expression levels were increased by 10%–30% in human DMD muscle fibers. The restored dystrophin in vivo was functional, as demonstrated by the expression of the dystrophin glycoprotein complex member β-dystroglycan. This study provides a sensitive indicator for in vivo efficacy of gene editing and lays the foundation for a clinical trial of DMD treatment with gene editing technology.
2021-02-28 | GSE167572 | GEO