Novel endogenous antisense transcripts in mouse
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
SUBMITTER: Koji Numata
PROVIDER: E-GEOD-14568 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Publications
Identification of novel endogenous antisense transcripts by DNA microarray analysis targeting complementary strand of annotated genes.
Numata Koji K Osada Yuko Y Okada Yuki Y Saito Rintaro R Hiraiwa Noriko N Nakaoka Hajime H Yamamoto Naoyuki N Watanabe Kazufumi K Okubo Kazue K Kohama Chihiro C Kanai Akio A Abe Kuniya K Kiyosawa Hidenori H
BMC genomics 20090822
<h4>Background</h4>Recent transcriptomic analyses in mammals have uncovered the widespread occurrence of endogenous antisense transcripts, termed natural antisense transcripts (NATs). NATs are transcribed from the opposite strand of the gene locus and are thought to control sense gene expression, but the mechanism of such regulation is as yet unknown. Although several thousand potential sense-antisense pairs have been identified in mammals, examples of functionally characterized NATs remain limi ...[more]
Similar Datasets
Project description:Recent transcriptomic analyses have uncovered widespread occurrence of natural antisense transcripts (NATs), which are transcribed from the opposite strand of another discrete transcribed region. We describe a novel probe-design technique for DNA microarray analysis that specifically targets the complementary strand of annotated genes, and show that this technique can successfully identify novel NAT expression in normal and tumor samples. Northern and in situ hybridization analyses of selected examples (Acaa1, Aard, and Thbd) confirmed their transcription and dynamic expression in a tissue- and cell-type-specific manner. Our data highlight the importance of NAT expression in the regulation of cellular processes and in oncogenesis. The fundamental basis of the technology described in this paper is applicable to all genes and sample types for the identification of NAT expression that is not possible by conventional cDNA/EST/CAGE information. Total RNA for the GRS mammary tumor microarray experiments was isolated from normal and cancerous mammary glands of dissected GRS/A mice, by using Trizol reagent (Invitrogen Corporation). Unpublished data has been masked in the supplementary feature extraction files.
2010-05-06 | E-GEOD-14557 | biostudies-arrayexpress
Project description:Recent transcriptomic analyses have uncovered widespread occurrence of natural antisense transcripts (NATs), which are transcribed from the opposite strand of another discrete transcribed region. We describe a novel probe-design technique for DNA microarray analysis that specifically targets the complementary strand of annotated genes, and show that this technique can successfully identify novel NAT expression in normal and tumor samples. Northern and in situ hybridization analyses of selected examples (Acaa1, Aard, and Thbd) confirmed their transcription and dynamic expression in a tissue- and cell-type-specific manner. Our data highlight the importance of NAT expression in the regulation of cellular processes and in oncogenesis. The fundamental basis of the technology described in this paper is applicable to all genes and sample types for the identification of NAT expression that is not possible by conventional cDNA/EST/CAGE information. Total RNA for the mouse (C57BL/6J) microarray experiments was isolated from SL10 cells (fibroblast cell line), brain, heart, intestine, kidney, liver, lung, placenta (d.p.c. 10.5 and 13.5), spleen, stomach, testis, and thymus. Testis was from C57BL/6J males (8 to 10 weeks), placenta was from pregnant mice, and the other tissue was from both male and female mice. Unpublished data has been masked in the supplementary feature extraction files.
2010-05-06 | E-GEOD-14372 | biostudies-arrayexpress
Project description:Sense-antisense transcript (SAT) pairs are pairs of transcripts that fully or partially overlap but are transcribed in opposite directions. Although SAT expression occurs in various species, most SAT pairs have not been examined in detail. Because our previous studies revealed some tissue specificity in SAT expression, SAT pairs might be involved in cell differentiation and the maintenance of tissue-specific gene expression programs. To analyze such tissue-specific SAT pairs, we assessed the expression profiles of SATs from 12 tissues of normal mice at a genome-wide scale and found that a considerable number of SAT pairs showed expression patterns unique to testis. This finding prompted us to study the relationship between SAT expression pattern and another epigenetic gene regulatory mechanism, DNA methylation. We conducted a comparative global analysis of the DNA methylation status of CpG island (CGI)-associated SAT loci from various tissues and found that in 99 of the 4911 SAT pairs studied, DNA methylation could cooperatively suppress its downstream “sense” transcription together with the “antisense” transcriptional activity in a tissue-specific manner. The tissue-specific differentially methylated regions (T-DMRs) of these SAT pairs mainly occurred outside of the defined CGIs. In addition, some of these T-DMRs are situated at the 5′ region of the antisense transcripts. This positioning implies a novel mechanism for DNA methylation to regulate gene transcription, in which DNA methylation inhibits an opposing transcriptional activity and therefore maintains stable expression of a tissue-specific gene. Twelve tissues (brain, thymus, heart, lung, liver, spleen, stomach, kidney, small intestine, testis, and placentae [10.5 and 13.5 days postcoitum (dpc)]) of C57BL/6J Jc1 and a mouse fibroblast cell line (SL10) were used for the mouse expression oligo-microarray. The expression array data were obtained by both oligo-dT and random priming methods, except for SL10 (olio-dT only). Twelve tissues (brain, thymus, heart, lung, liver, spleen, stomach, kidney, small intestine, testis, and placentae [10.5 and 13.5 days postcoitum (dpc)]) were used for DIP chip experiments. Nine of twelve tissues were separately analyzed classified on the basis of sex. A technical duplication of DIP chip analysis was performed by using the same genomic DNA of male kidney.
2010-08-26 | E-GEOD-14392 | biostudies-arrayexpress
Project description:Background: Recent studies have identified thousands of sense-antisense gene pairs across different genomes by computational mapping of cDNA sequences. These studies have shown that approximately 25% of all transcriptional units in the human and mouse genomes are involved in cis-sense-antisense pairs. However, the number of known sense-antisense pairs remains limited because currently available cDNA sequences represent only a fraction of the total number of transcripts comprising the transcriptome of each cell type. Results: To discover novel antisense transcripts encoded in the antisense strand of important genes, such as cancer-related genes, we conducted expression analyses of antisense transcripts using our custom microarray platform along with 2376 probes designed specifically to detect the potential antisense transcripts of 501 well-known genes suitable for cancer research. Using colon cancer tissue and normal tissue surrounding the cancer tissue obtained from 6 patients, we found that antisense transcripts without poly(A) tails are expressed from approximately 80% of these well-known genes. This observation is consistent with our previous finding that many antisense transcripts expressed in a cell are poly(A)-. We also identified 101 and 71 antisense probes displaying a high level of expression specifically in normal and cancer tissues respectively. Some of these probes showed characteristic expression patterns which are anti-correlated with the expression patterns of the sense genes. Conclusion: Our microarray analysis identified novel antisense transcripts with expression profiles specific to cancer tissue, some of which might play a role in the regulatory networks underlying oncogenesis and thus are potential targets for further experimental validation. 501 probes targeting well-known genes suitable for cancer researches were designed. Additionally 2,376 probes targeting putative transcription units on the antisense strand of these genes were designed. Samples were obtained from colon cancer tissues and normal tissues surrounding cancer tissues of six patients.
2011-03-01 | E-GEOD-14397 | biostudies-arrayexpress
Project description:We characterized the expression patterns of sense-antisense transcripts, based on available cDNA sequences, in colon (colorectal) cancer tissues and in normal tissues surrounding the cancer tissues. Although expression balances (ratios) of most of sense and antisense transcript pairs did not change between patients or between normal and cancer tissues, we found 68 sense-antisense transcripts whose expression balances were altered specifically in colon cancer tissues. We conducted DNA microarray analyses by using the same set of probes designed for 2621 sense-antisense pairs to detect transcripts expressed in colon cancer tissues. These probes comprise 2358 pairs for the detection of protein-coding transcripts only, 250 pairs for the detection of protein-coding transcripts paired with non-protein-coding transcripts, and 13 pairs for the detection of non-protein-coding transcripts only.
2011-03-01 | E-GEOD-14398 | biostudies-arrayexpress
Project description:To elucidate the impact of TAF6d on cell death and gene expression, here we have employed modified antisense oligonucleotides to enforce expression of endogenous TAF6d. The induction of endogenous TAF6d triggered apoptosis in tumor cell lines, including cells devoid of p53. Microarray experiments revealed that TAF6d activates gene expression independently of cellular p53 status. Our data define TAF6d as a pivotal node in a signaling pathway that acts immediately downstream of p53 to control gene expression programmes and apoptosis. Keywords: Treatment with splice site switching antisense oligonucleotides, induction of apoptosis Biological triplicates, 4 conditions: isogenic p53+/+ and -/- cells; control oligonucleotide, TAF6 AS2 oligonucleotide
2008-06-26 | E-GEOD-10795 | biostudies-arrayexpress
Project description:Applications for silver nanomaterials in consumer products are rapidly expanding, creating an urgent need for toxicological examination of the exposure potential and ecological effects of silver nanoparticles (AgNPs). The integration of genomic techniques into environmental toxicology has presented new avenues to develop exposure biomarkers and investigate the mode of toxicity of novel chemicals. In the present study we used a 15k oligonucleotide microarray for Daphnia magna, a freshwater crustacean and common indicator species for toxicity, to differentiate between particle specific and ionic silver toxicity and to develop exposure biomarkers for citrate-coated and PVP-coated AgNPs. Gene expression profiles revealed that AgNO3 and AgNPs have distinct expression profiles suggesting different modes of toxicity. However, the gene expression profiles of the different coated AgNPs were similar revealing similarities in the cellular effects of these two particles. Major biological processes disrupted by the AgNPs include protein metabolism and signal transduction. In contrast, AgNO3 caused a downregulation of developmental processes, particularly in sensory development. Metal responsive and DNA damage repair genes were induced by the PVP AgNPs, but not the other treatments. In addition, two specific biomarkers were developed for the environmental detection of PVP AgNPs; although further verification under different environmental conditions is needed. We exposed Daphnia magna to the 1/10 LC50 and LC25 of citrate coated and PVP-coated Ag nanoparticles and Ag+ as AgNO3 for 24-h. For each exposure condition, we performed 6 replicate exposures with 5 individuals in each. All exposures were compared to a unexposed laboratory control.
2012-08-04 | E-GEOD-35150 | biostudies-arrayexpress
Project description:The goal of this study was to compare the transcriptional profile (RNA-seq) of Dengue virus 2 and mock infected cells at 24 and 36 hours post infection. Dengue virus NS5 protein plays multiple functions in the cytoplasm of infected cells, enabling viral RNA replication and counteracting host antiviral responses. Here, we demonstrate a novel function of NS5 in the nucleus where it interferes with cellular splicing. Using global proteomic analysis of infected cells together with functional studies, we found that NS5 binds spliceosome complexes and modulates endogenous splicing. In particular, we show that NS5 alone, or in the context of viral infection, interacts with core components of the U5 snRNP particle, CD2BP2 and DDX23, alters the inclusion/exclusion ratio of alternative splicing events, and changes mRNA isoform abundance of known antiviral factors. Interestingly, a genome wide transcriptome analysis, using recently developed bioinformatics tools, revealed an increase of intron retention upon dengue virus infection, and viral replication was improved by silencing specific U5 components. Different mechanistic studies indicate that binding of NS5 to the spliceosome reduces the efficiency of pre-mRNA processing, independently of NS5 enzymatic activities. We propose that NS5 binding to U5 snRNP proteins hijacks the splicing machinery resulting in a less restrictive environment for viral replication. A549 cells where infected with Dengue virus 2 or mock and after 24 and 36 hours post infection mRNA was purified. Then the transcriptional profile of these cells was analyzed using RNA-seq.
2016-08-09 | E-GEOD-84285 | biostudies-arrayexpress
Project description:The decision of metazoan cells to live or undergo programmed cell death hinges on the balance between the levels of pro- versus anti-apoptotic gene products. The general RNA polymerase II (Pol II) transcription factor, TFIID, plays a central role in the regulation of gene expression through its core promoter recognition and co-activator functions. The core TFIID subunit TAF6 is a co-activator for the pro-apoptotic p53 tumour suppressor protein. Our previous studies identified a specialized isoform of TAF6, termed TAF6 that can specifically be induced in apoptosis. To elucidate the impact of TAF6 on gene expression and cell death, we employed modified antisense oligonucleotides to enforce expression of endogenous TAF6. The induction of endogenous TAF6 triggered apoptosis in several cancer cell lines. Importantly, TAF6 also induces apoptosis in tumor cell lines devoid of p53, placing TAF6 function downstream of p53. Microarray experiments uncovered a TAF6-induced transcriptome landscape displaying enhanced expression of genes of the Notch, oxidative stress, integrin, p53 and apoptosis pathways. Our data show that the TAF6 pathway is a pivotal signalling nexus that controls pro-apoptotic gene expression programs. Keywords: Treatment with splice site switching antisense oligonucleotides, induction of apoptosis Biological triplicates, 3 conditions: control oligonucleotide, Taf6 oligonucleotide, specificity control Bcl-x oligonucleotide
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