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The splicing co-factor Barricade/Tat-SF1, is required for cell cycle and lineage progression in Drosophila neural stem cells.

ABSTRACT: Stem cells need to balance self-renewal and differentiation for correct tissue development and homeostasis. Defects in this balance can lead to developmental defects or tumor formation. In recent years, mRNA splicing has emerged as one important mechanism regulating cell fate decisions. Here we address the role of the evolutionary conserved splicing co-factor Barricade (Barc)/CUS2/Tat-SF1 in Drosophila neural stem cell (neuroblast) lineage formation. We show that Barc is required for the generation of neurons during Drosophila brain development by ensuring correct neural progenitor proliferation and differentiation. Barc associates with components of the U2 small nuclear ribonucleic proteins (snRNP), and its depletion causes alternative splicing in form of intron retention in a subset of genes. Using bioinformatics analysis and a cell culture based splicing assay, we found that Barc dependent introns share three major traits: they are short, GC rich and have weak 3’ splice sites. Our results show that Barc, t...

ORGANISM(S): Drosophila melanogaster

PROVIDER: GSE96549 | GEO | 2017/09/18

SECONDARY ACCESSION(S): PRJNA378990

REPOSITORIES: GEO

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The splicing co-factor Barricade/Tat-SF1, is required for cell cycle and lineage progression in Drosophila neural stem cells.

Project description:Stem cells need to balance self-renewal and differentiation for correct tissue development and homeostasis. Defects in this balance can lead to developmental defects or tumor formation. In recent years, mRNA splicing has emerged as one important mechanism regulating cell fate decisions. Here we address the role of the evolutionary conserved splicing co-factor Barricade (Barc)/CUS2/Tat-SF1 in Drosophila neural stem cell (neuroblast) lineage formation. We show that Barc is required for the generation of neurons during Drosophila brain development by ensuring correct neural progenitor proliferation and differentiation. Barc associates with components of the U2 small nuclear ribonucleic proteins (snRNP), and its depletion causes alternative splicing in form of intron retention in a subset of genes. Using bioinformatics analysis and a cell culture based splicing assay, we found that Barc dependent introns share three major traits: they are short, GC rich and have weak 3’ splice sites. Our results show that Barc, together with the U2snRNP, plays an important role in regulating neural stem cell lineage progression during brain development and facilitates correct splicing of a subset of introns.

2017-11-02 | PXD006068 | Pride

Streptococcus iniae SF1

Project description:Streptococcus iniae SF1 Genome sequencing

| PRJNA196817 | ENA

Gene expression profiling of SF1 in mouse uterus tissues

Project description:Epigenetic silencing of Steroidogenic Factor 1 (SF1) is lost in endometrial tissue in endometriosis and this is hypothesized to result in de novo local steroidogenesis favoring growth and inflammation. The goal of this study was to evaluate the endometrial specific transcriptional and functional role of SF1 in vivo by utilizing a mouse model in which SF1 was conditionally expressed in the uterus. SF1 expression resulted in the development of cystic endometrial glands and infertility. Endometriosis induction by auto-transplantation of a biopsy of uterine tissue sutured to the mesenteric membrane resulted in 4-fold increase in size ectopic lesions from SF1 expressing mice. Microarray analysis demonstrated SF1-regulated genes are involved in several pathways including epithelial and tube development, migration of lymphocytes and leukocytes, cellular movement and vascular development.

2016-04-14 | GSE66963 | GEO

Multilineage pituitary neuroendocrine tumors with PIT1/SF1 co-expression

Project description:Pituitary neuroendocrine tumors (PitNET)/adenomas are classified according to cell lineage, which requires immunohistochemistry for the transcription factors (TFs) PIT1, SF1, and TPIT. Co-expression of PIT1/SF1 was previously reported in PitNETs, which otherwise correspond to the somatotroph lineage. However, little is known about the clinicopathological features of these tumors. We compiled an in-house case series of 100 tumors, previously diagnosed as densely or sparsely granulated somatotroph PitNETs. Following TF staining, histopathological features associated with PIT1/SF1-coexpression were assessed. Global DNA methylation profiling was conducted on 31 of 100 in-house samples and integrated with publicly available sample data. The majority (74%, 52/70) of our densely granulated somatotroph PitNETs (DGST) unequivocally co-expressed PIT1 and SF1 (DGST-PIT1/SF1). None of our SGST (0%, 0/30) stained positive for SF1 (SGST-PIT1). Integrated molecular analyses including publicly available sample data confirmed that DGST-PIT1/SF1, DGST-PIT1 and SGST-PIT1 represent distinct tumour subtypes. In summary, we spotlight that a substantial proportion of previously diagnosed densely granulated somatotroph PitNET co-express PIT1 and SF1 and exhibit clinical, histopathological, and molecular distinctness from other pure PIT1-lineage somatotroph PitNET.

2024-01-24 | GSE246645 | GEO

Streptococcus mutans SF1

Project description:Streptococcus mutans SF1 genome sequencing project.

| PRJNA49821 | ENA

Gene expression profiling of SF1 in mouse uterus tissues

2016-04-14 | E-GEOD-66963 | biostudies-arrayexpress

Actinomycetospora sp. SF1

Project description:Actinomycetospora sp. SF1 Genome sequencing and assembly

| PRJNA779177 | ENA

Gene expression profiling of SF1 knockdown in human endometriotic stromal fibroblast

Project description:Epigenetic silencing of Steroidogenic Factor 1 (SF1) is lost in endometrial tissue in endometriosis and this is hypothesized to result in de novo local steroidogenesis favoring growth and inflammation. The goal of this study was to evaluate the endometrial specific transcriptional and functional role of SF1. Expression of SF1 was robustly increased in cultures established from stromal fibroblasts isolated from endometriomas (OsisHESC) over endometrial stromal cells isolated from eutopic sites in healthy proliferative phase endometrial biopsies (HESC). In order to evaluate the role of SF1 in the regulation of genes in fibroblast isolated from human endometriomas, OsisHESC were transfected with scrambled siRNA (siNT) or siRNA targeting SF1 (siSF1).

2016-05-12 | GSE67524 | GEO

gonads gene expression profiling in WT and Sox9flox/flox; Sf1:creTr/+ mice

Project description:In mammals, gonadal differentiation is the first step of sex determination, and the transcription factor Sox9 promotes testis differentiation. Here we used the XY Sox9flox/flox; Sf1:creTr/+ mouse model and show that the lack of Sox9 expression induces a full sex reversal of E13.5 XY Sox9flox/flox; Sf1:creTr/+ gonads compared to XY Sox9flox/flox. Keywords: gonads gene expression profiling in WT and Sox9flox/flox; Sf1:creTr/+ mice 3 WT versus 3 Sox9flox/flox; Sf1:creTr/+ mice.

2011-11-01 | E-GEOD-21650 | biostudies-arrayexpress

Project description:The vertebrate nuclear hormone receptor steroidogenic factor 1 (SF1; NR5A1) controls reproductive development and regulates the transcription of steroid-modifying cytochrome P450 genes. We find that the SF1-related Drosophila nuclear hormone receptor HR39 is also essential for sexual development. In Hr39 mutant females, the sperm-storing spermathecae and glandular parovaria are absent or defective, causing sterility. Our results indicate that spermathecae and parovaria secrete reproductive tract proteins required for sperm maturation and function, like the mammalian epididymis and female reproductive tract. Hr39 controls the expression of specific cytochrome P450 genes and is required in females both to activate spermathecal secretion and repress male-specific courtship genes such as takeout. Thus, a pathway that, in vertebrates, controls sex-specific steroid hormone production, also mediates reproductive functions in an invertebrate. Our findings suggest that Drosophila can be used to model more aspects of mammalian reproductive biology than previously believed. Keywords: mutant/wild-type comparison and tissue comparison

2008-04-26 | GSE10264 | GEO

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