Abstract:
:Previous work has shown that rRNA synthesis is strongly inhibited in yeast top1-top2 double mutants. Here, we show that inactivation of yeast topoisomerases can have paradoxical effects on transcription by RNA polymerase I. For example, transcription of ribosomal minigenes on extrachromosomal plasmids is greatly stimulated in top1-top2 cells while accumulation of full-length endogenous rRNA is strongly inhibited. We present evidence for a mechanism that can partly account for these opposing effects on transcription. On the one hand, transcription initiation can be stimulated owing to an accumulation of negative superhelicity because polymerase I prefers to initiate on negatively supercoiled templates. Conversely, synthesis of full-length rRNA is inhibited owing to the fact that chain elongation requires a DNA relaxing activity.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Schultz MC,Brill SJ,Ju Q,Sternglanz R,Reeder RHdoi
10.1101/gad.6.7.1332subject
Has Abstractpub_date
1992-07-01 00:00:00pages
1332-41issue
7eissn
0890-9369issn
1549-5477journal_volume
6pub_type
杂志文章abstract::The human T cell-specific transcription factor TCF-1 alpha plays a key role in the tissue-specific activation of the T cell receptor (TCR) C alpha enhancer and binds to pyrimidine-rich elements (5'-PyCTTTG-3') present in a variety of other T cell-specific control regions. Using amino acid sequence information derived ...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.5.4.656
更新日期:1991-04-01 00:00:00
abstract::In the July 15, 2010, issue of Genes & Development, Yoon and colleagues (pp. 1507-1518) report that, in a siRNA knockdown survey of 6363 genes in mouse C2C12 cells, they discovered 150 genes that regulated mitochondrial biogenesis and bioenergetics. Many of these genes have been studied previously for their importance...
journal_title:Genes & development
pub_type: 评论,杂志文章
doi:10.1101/gad.1960210
更新日期:2010-08-01 00:00:00
abstract::Alteration of nucleosomes by ATP-dependent remodeling complexes represents a critical step in the regulation of transcription. The human SWI/SNF (hSWI/SNF) family is composed of complexes that contain either Brg1 or hBrm as the central ATPase; however, these separate complexes have not been compared functionally. Here...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.872801
更新日期:2001-03-01 00:00:00
abstract::Eukaryotic genomes encode large families of deubiquitinating enzymes (DUBs). Genetic data suggest that Fat facets (Faf), a Drosophila DUB essential for patterning the compound eye, might have a novel regulatory function; Faf might reverse the ubiquitination of a specific substrate, thereby preventing proteasomal degra...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.961502
更新日期:2002-02-01 00:00:00
abstract::The formins constitute a set of protein isoforms encoded by the alternatively spliced transcripts arising from the limb deformity (ld) locus of the mouse. Mutations in this locus disrupt formation of the anteroposterior axis of the embryonic limb. Although ld transcripts are widely expressed during embryogenesis, we h...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.6.1.29
更新日期:1992-01-01 00:00:00
abstract::The acetylation state of histones plays a central role in determining gene expression in chromatin. The reestablishment of the acetylation state of nucleosomes after DNA replication and chromatin assembly requires both deacetylation and acetylation of specific lysine residues on newly incorporated histones. In this st...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.929001
更新日期:2001-12-01 00:00:00
abstract::Kinetochores play an essential role in chromosome segregation by forming dynamic connections with spindle microtubules. Here, we identify a set of 10 copurifying kinetochore proteins from Caenorhabditis elegans, seven of which were previously uncharacterized. Using in vivo assays to monitor chromosome segregation, kin...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.1234104
更新日期:2004-09-15 00:00:00
abstract::The Arabidopsis APETALA3 (AP3) and PISTILLATA (PI) proteins are thought to act as transcription factors and are required for specifying floral organ identities. To define the nuclear localization signals within these proteins, we generated translational fusions of the coding regions of AP3 and PI to the bacterial uidA...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.10.14.1812
更新日期:1996-07-15 00:00:00
abstract::Medulloblastomas are among the most common malignancies in childhood, and they are associated with substantial mortality and morbidity. The molecular pathogenesis as well as the ontogeny of these neoplasms is still poorly understood. We have generated a mouse model for medulloblastoma by Cre-LoxP-mediated inactivation...
journal_title:Genes & development
pub_type: 杂志文章
doi:
更新日期:2000-04-15 00:00:00
abstract::Netrins are secreted molecules with roles in axonal growth and angiogenesis. The Netrin receptor UNC5B is required during embryonic development for vascular patterning, suggesting that it may also contribute to postnatal and pathological angiogenesis. Here we show that unc5b is down-regulated in quiescent adult vascul...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.437807
更新日期:2007-10-01 00:00:00
abstract::During vascular development, endothelial platelet-derived growth factor B (PDGF-B) is critical for pericyte recruitment. Deletion of the conserved C-terminal heparin-binding motif impairs PDGF-BB retention and pericyte recruitment in vivo, suggesting a potential role for heparan sulfate (HS) in PDGF-BB function during...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.398207
更新日期:2007-02-01 00:00:00
abstract::Cellular senescence limits proliferation of potentially detrimental cells, preventing tumorigenesis and restricting tissue damage. However, the function of senescence in nonpathological conditions is unknown. We found that the human placental syncytiotrophoblast exhibited the phenotype and expressed molecular markers ...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.227512.113
更新日期:2013-11-01 00:00:00
abstract::MCM1 is an essential yeast DNA-binding protein that affects both minichromosome maintenance, in a manner suggesting that it has DNA replication initiation function, and gene expression. It activates alpha-specific genes together with MAT alpha 1, and represses a-specific genes together with MAT alpha 2. Alone, MCM1 ca...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.5.5.751
更新日期:1991-05-01 00:00:00
abstract::Although Apc is well characterized as a tumor-suppressor gene in the intestine, the precise mechanism of this suppression remains to be defined. Using a novel inducible Ahcre transgenic line in conjunction with a loxP-flanked Apc allele we, show that loss of Apc acutely activates Wnt signaling through the nuclear accu...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.287404
更新日期:2004-06-15 00:00:00
abstract::To find new genes that influence liver lipid mass, we performed a genetic screen for zebrafish mutants with hepatic steatosis, a pathological accumulation of fat. The red moon (rmn) mutant develops hepatic steatosis as maternally deposited yolk is depleted. Conversely, hepatic steatosis is suppressed in rmn mutants by...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.180968.111
更新日期:2012-02-01 00:00:00
abstract::The heterochromatin-like structure formed by the yeast silent information regulator complex (SIR) represses transcription at the silent mating type loci and telomeres. Here, we report that tight protein-DNA complexes induce ectopic recruitment of the SIR complex, promoting gene silencing and changes in subnuclear loca...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.611011
更新日期:2011-07-01 00:00:00
abstract::Interruption of translation in Escherichia coli can lead to the addition of an 11-residue carboxy-terminal peptide tail to the nascent chain. This modification is mediated by SsrA RNA (also called 10Sa RNA and tmRNA) and marks the tagged polypeptide for proteolysis. Degradation in vivo of lambda repressor amino-termin...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.12.9.1338
更新日期:1998-05-01 00:00:00
abstract::The SNF1 protein kinase is broadly conserved in eukaryotes and has been implicated in responses to environmental and nutritional stress. In yeast, the SNF1 kinase has a central role in the response to glucose starvation. SNF1 is associated with its activating subunit, SNF4, and other proteins in complexes. Using the t...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.10.24.3105
更新日期:1996-12-15 00:00:00
abstract::Nitric oxide (NO) is an important second messenger involved in numerous biological processes, but how it regulates gene expression is not well understood. In this issue of Genes & Development, Cáceres and colleagues (pp. 1476-1485) report a critical requirement of NO as a direct regulator of gene expression through it...
journal_title:Genes & development
pub_type: 评论,杂志文章
doi:10.1101/gad.2080411
更新日期:2011-07-15 00:00:00
abstract::The subdivision of the lateral mesoderm into a visceral (splanchnic) and a somatic layer is a crucial event during early mesoderm development in both arthropod and vertebrate embryos. In Drosophila, this subdivision leads to the differential development of gut musculature versus body wall musculature. Here we report t...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.917101
更新日期:2001-11-01 00:00:00
abstract::Atypical teratoid rhabdoid tumors (ATRTs) are challenging pediatric brain cancers that are predominantly associated with inactivation of the gene SMARCB1, a conserved subunit of the chromatin remodeling BAF complex, which has known contributions to developmental processes. To identify potential interactions between SM...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.339978.120
更新日期:2020-10-01 00:00:00
abstract::The orphan nuclear receptor TLX regulates neural stem cell self-renewal in the adult brain and functions primarily as a transcription repressor through recruitment of Atrophin corepressors, which bind to TLX via a conserved peptide motif termed the Atro box. Here we report crystal structures of the human and insect TL...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.254904.114
更新日期:2015-02-15 00:00:00
abstract::The mechanisms of RNA replication of plus-strand RNA viruses are still unclear. Here, we identified the first promoter element for RNA synthesis described in a flavivirus. Using dengue virus as a model, we found that the viral RdRp discriminates the viral RNA by specific recognition of a 5' element named SLA. We demon...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.1444206
更新日期:2006-08-15 00:00:00
abstract::The Rad51 and Lim15 proteins of lily, which are homologs of the bacterial RecA protein, were found on chromosomes in various stages of meiotic prophase 1. The presence of both Rad51 and Lim15 proteins as discrete foci on leptotene and zygotene chromosomes and their colocalization suggest that meiotic recombination beg...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.9.8.925
更新日期:1995-04-15 00:00:00
abstract::The third-chromosome mutation Killer of prune (K-pn) causes no phenotype by itself, but causes lethality in individuals homozygous for the nonlethal X-chromosome mutation prune (pn). We have recovered 12 gamma-ray-induced revertants of Killer of prune. All of the revertants fail to complement a recessive cell lethal m...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.2.10.1333
更新日期:1988-10-01 00:00:00
abstract::It is postulated that the symmetric organization of plant lateral organs is based on two crossed axes, the abaxial-adaxial and the lateral axes. The PRESSED FLOWER (PRS) gene, the expression and function of which are dependent on the lateral axis, is reported in this study. In the prs mutant, growth of the lateral sep...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.931001
更新日期:2001-12-15 00:00:00
abstract::The RNA polymerase II (RNAPII) C-terminal domain kinase, CDK12, regulates genome stability, expression of DNA repair genes, and cancer cell resistance to chemotherapy and immunotherapy. In addition to its role in mRNA biosynthesis of DNA repair genes, we show here that CDK12 phosphorylates the mRNA 5' cap-binding repr...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.322339.118
更新日期:2019-04-01 00:00:00
abstract::Serotonin is a bioamine regulating bone mass accrual differently depending on its site of synthesis. It decreases accrual when synthesized in the gut, and increases it when synthesized in the brain. The signal transduction events elicited by gut-derived serotonin once it binds to the Htr1b receptor present on osteobla...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.1977210
更新日期:2010-10-15 00:00:00
abstract::The transcription cofactor MAL is regulated by free actin levels and thus by actin dynamics. MAL, together with its DNA-binding partner, SRF, is required for invasive cell migration and in experimental metastasis. Although MAL/SRF has many targets, we provide genetic evidence in both Drosophila and human cellular mode...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.237743.114
更新日期:2014-05-15 00:00:00
abstract::The ultraviolet (UV)-induced (6-4) pyrimidine-pyrimidone photoproduct [(6-4) PP] confers a large structural distortion in DNA. Here we examine in human cells the roles of translesion synthesis (TLS) DNA polymerases (Pols) in promoting replication through a (6-4) TT photoproduct carried on a duplex plasmid where bidire...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.1872810
更新日期:2010-01-15 00:00:00