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  • 1
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    PRC2 recruitment and H3K27me3 deposition at FLC require FCA binding of COOLAIR (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉The cold-induced antisense transcript 〈i〉COOLAIR〈/i〉 represses 〈i〉FLOWERING LOCUS C〈/i〉 (〈i〉FLC〈/i〉) transcription with increased H3K27me3 and decreased H3K36me3 levels in response to cold temperatures. However, the molecular connection between 〈i〉COOLAIR〈/i〉 and histone modification factors in the absence of cold treatment remains unclear. We report that the RNA binding protein FCA interacts with the PRC2 subunit CURLY LEAF (CLF) and binds nascent 〈i〉COOLAIR〈/i〉 transcripts to allow deposition of H3K27me3 at 〈i〉FLC〈/i〉. Loss of 〈i〉COOLAIR〈/i〉 function results in a reduction in FCA and CLF enrichment, which, in turn, decreases H3K27me3 levels at 〈i〉FLC〈/i〉. The 〈i〉Arabidopsis〈/i〉 protein phosphatase SSU72 physically interacts with the RRM1 motif of FCA to antagonize FCA binding with 〈i〉COOLAIR〈/i〉. Mutations in 〈i〉SSU72〈/i〉 caused early flowering, reduced 〈i〉FLC〈/i〉 transcription, increased CLF enrichment and H3K27me3, and enhanced affinity between FCA and 〈i〉COOLAIR〈/i〉. Our results suggest that FCA binding of 〈i〉COOLAIR〈/i〉 and SSU72 is critical for PRC2 enrichment and H3K27me3 deposition in 〈i〉Arabidopsis〈/i〉.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Trimethylamine N-oxide-derived zwitterionic polymers: A new class of ultralow fouling bioinspired materials (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉Materials that resist nonspecific protein adsorption are needed for many applications. However, few are able to achieve ultralow fouling in complex biological milieu. Zwitterionic polymers emerge as a class of highly effective ultralow fouling materials due to their superhydrophilicity, outperforming other hydrophilic materials such as poly(ethylene glycol). Unfortunately, there are only three major classes of zwitterionic materials based on poly(phosphorylcholine), poly(sulfobetaine), and poly(carboxybetaine) currently available. Inspired by trimethylamine 〈i〉N〈/i〉-oxide (TMAO), a zwitterionic osmolyte and the most effective protein stabilizer, we here report TMAO-derived zwitterionic polymers (PTMAO) as a new class of ultralow fouling biomaterials. The nonfouling properties of PTMAO were demonstrated under highly challenging conditions. The mechanism accounting for the extraordinary hydration of PTMAO was elucidated by molecular dynamics simulations. The discovery of PTMAO polymers demonstrates the power of molecular understanding in the design of new biomimetic materials and provides the biomaterials community with another class of nonfouling zwitterionic materials.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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  • 3
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    Intrinsic magnetic topological insulators in van der Waals layered MnBi2Te4-family materials (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉The interplay of magnetism and topology is a key research subject in condensed matter physics, which offers great opportunities to explore emerging new physics, such as the quantum anomalous Hall (QAH) effect, axion electrodynamics, and Majorana fermions. However, these exotic physical effects have rarely been realized experimentally because of the lack of suitable working materials. Here, we predict a series of van der Waals layered MnBi〈sub〉2〈/sub〉Te〈sub〉4〈/sub〉-related materials that show intralayer ferromagnetic and interlayer antiferromagnetic exchange interactions. We find extremely rich topological quantum states with outstanding characteristics in MnBi〈sub〉2〈/sub〉Te〈sub〉4〈/sub〉, including an antiferromagnetic topological insulator with the long-sought topological axion states on the surface, a type II magnetic Weyl semimetal with one pair of Weyl points, as well as a collection of intrinsic axion insulators and QAH insulators in even- and odd-layer films, respectively. These notable predictions, if proven experimentally, could profoundly change future research and technology of topological quantum physics.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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  • 4
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    Label-free biomedical imaging with high sensitivity by stimulated Raman scattering microscopy (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-12-20
    Description: Label-free chemical contrast is highly desirable in biomedical imaging. Spontaneous Raman microscopy provides specific vibrational signatures of chemical bonds, but is often hindered by low sensitivity. Here we report a three-dimensional multiphoton vibrational imaging technique based on stimulated Raman scattering (SRS). The sensitivity of SRS imaging is significantly greater than that of spontaneous Raman microscopy, which is achieved by implementing high-frequency (megahertz) phase-sensitive detection. SRS microscopy has a major advantage over previous coherent Raman techniques in that it offers background-free and readily interpretable chemical contrast. We show a variety of biomedical applications, such as differentiating distributions of omega-3 fatty acids and saturated lipids in living cells, imaging of brain and skin tissues based on intrinsic lipid contrast, and monitoring drug delivery through the epidermis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3576036/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3576036/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Freudiger, Christian W -- Min, Wei -- Saar, Brian G -- Lu, Sijia -- Holtom, Gary R -- He, Chengwei -- Tsai, Jason C -- Kang, Jing X -- Xie, X Sunney -- CA113605/CA/NCI NIH HHS/ -- DP1 OD000277/OD/NIH HHS/ -- DP1 OD000277-05/OD/NIH HHS/ -- R01 CA113605/CA/NCI NIH HHS/ -- R01 CA113605-01A2/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2008 Dec 19;322(5909):1857-61. doi: 10.1126/science.1165758.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19095943" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line, Tumor ; Corpus Callosum/chemistry/cytology ; Dimethyl Sulfoxide/administration & dosage/pharmacokinetics ; Eicosapentaenoic Acid/metabolism ; Epidermis/chemistry/metabolism/ultrastructure ; Humans ; Imaging, Three-Dimensional/*methods ; Lipids/*analysis ; Mice ; Microscopy/*methods ; Neurons/ultrastructure ; Sensitivity and Specificity ; Skin/chemistry/ultrastructure ; *Spectrum Analysis, Raman ; Tretinoin/administration & dosage/pharmacokinetics ; Vitamin A/analysis/chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Tet proteins can convert 5-methylcytosine to 5-formylcytosine and 5-carboxylcytosine (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-07-23
    Description: 5-methylcytosine (5mC) in DNA plays an important role in gene expression, genomic imprinting, and suppression of transposable elements. 5mC can be converted to 5-hydroxymethylcytosine (5hmC) by the Tet (ten eleven translocation) proteins. Here, we show that, in addition to 5hmC, the Tet proteins can generate 5-formylcytosine (5fC) and 5-carboxylcytosine (5caC) from 5mC in an enzymatic activity-dependent manner. Furthermore, we reveal the presence of 5fC and 5caC in genomic DNA of mouse embryonic stem cells and mouse organs. The genomic content of 5hmC, 5fC, and 5caC can be increased or reduced through overexpression or depletion of Tet proteins. Thus, we identify two previously unknown cytosine derivatives in genomic DNA as the products of Tet proteins. Our study raises the possibility that DNA demethylation may occur through Tet-catalyzed oxidation followed by decarboxylation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3495246/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3495246/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ito, Shinsuke -- Shen, Li -- Dai, Qing -- Wu, Susan C -- Collins, Leonard B -- Swenberg, James A -- He, Chuan -- Zhang, Yi -- GM071440/GM/NIGMS NIH HHS/ -- GM68804/GM/NIGMS NIH HHS/ -- P30 ES010126/ES/NIEHS NIH HHS/ -- P30 ES010126-11/ES/NIEHS NIH HHS/ -- P30ES10126/ES/NIEHS NIH HHS/ -- P42 ES005948/ES/NIEHS NIH HHS/ -- P42 ES005948-17/ES/NIEHS NIH HHS/ -- P42ES5948/ES/NIEHS NIH HHS/ -- R01 GM068804/GM/NIGMS NIH HHS/ -- U01 DK089565/DK/NIDDK NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2011 Sep 2;333(6047):1300-3. doi: 10.1126/science.1210597. Epub 2011 Jul 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7295, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21778364" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methylcytosine/*metabolism ; Animals ; Cell Line ; Cytosine/*analogs & derivatives/metabolism ; DNA/*metabolism ; DNA Methylation ; DNA-Binding Proteins/genetics/*metabolism ; Embryonic Stem Cells/metabolism ; Humans ; Mice ; Oxidation-Reduction ; Proto-Oncogene Proteins/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Global epigenomic reconfiguration during mammalian brain development (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-07-06
    Description: DNA methylation is implicated in mammalian brain development and plasticity underlying learning and memory. We report the genome-wide composition, patterning, cell specificity, and dynamics of DNA methylation at single-base resolution in human and mouse frontal cortex throughout their lifespan. Widespread methylome reconfiguration occurs during fetal to young adult development, coincident with synaptogenesis. During this period, highly conserved non-CG methylation (mCH) accumulates in neurons, but not glia, to become the dominant form of methylation in the human neuronal genome. Moreover, we found an mCH signature that identifies genes escaping X-chromosome inactivation. Last, whole-genome single-base resolution 5-hydroxymethylcytosine (hmC) maps revealed that hmC marks fetal brain cell genomes at putative regulatory regions that are CG-demethylated and activated in the adult brain and that CG demethylation at these hmC-poised loci depends on Tet2 activity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3785061/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3785061/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lister, Ryan -- Mukamel, Eran A -- Nery, Joseph R -- Urich, Mark -- Puddifoot, Clare A -- Johnson, Nicholas D -- Lucero, Jacinta -- Huang, Yun -- Dwork, Andrew J -- Schultz, Matthew D -- Yu, Miao -- Tonti-Filippini, Julian -- Heyn, Holger -- Hu, Shijun -- Wu, Joseph C -- Rao, Anjana -- Esteller, Manel -- He, Chuan -- Haghighi, Fatemeh G -- Sejnowski, Terrence J -- Behrens, M Margarita -- Ecker, Joseph R -- AI44432/AI/NIAID NIH HHS/ -- CA151535/CA/NCI NIH HHS/ -- HD065812/HD/NICHD NIH HHS/ -- HG006827/HG/NHGRI NIH HHS/ -- K99NS080911/NS/NINDS NIH HHS/ -- MH094670/MH/NIMH NIH HHS/ -- R01 AI044432/AI/NIAID NIH HHS/ -- R01 CA151535/CA/NCI NIH HHS/ -- R01 HD065812/HD/NICHD NIH HHS/ -- R01 HG006827/HG/NHGRI NIH HHS/ -- R01 MH094670/MH/NIMH NIH HHS/ -- R01 MH094774/MH/NIMH NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2013 Aug 9;341(6146):1237905. doi: 10.1126/science.1237905. Epub 2013 Jul 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA. ryan.lister@uwa.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23828890" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methylcytosine/metabolism ; Adult ; Animals ; Base Sequence ; Conserved Sequence ; Cytosine/*analogs & derivatives/metabolism ; *DNA Methylation ; *Epigenesis, Genetic ; Epigenomics ; Frontal Lobe/*growth & development ; *Gene Expression Regulation, Developmental ; Genome-Wide Association Study ; Humans ; Longevity ; Mice ; Mice, Inbred C57BL ; X Chromosome Inactivation/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Identification of c-MYC as a target of the APC pathway (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-04
    Description: The adenomatous polyposis coli gene (APC) is a tumor suppressor gene that is inactivated in most colorectal cancers. Mutations of APC cause aberrant accumulation of beta-catenin, which then binds T cell factor-4 (Tcf-4), causing increased transcriptional activation of unknown genes. Here, the c-MYC oncogene is identified as a target gene in this signaling pathway. Expression of c-MYC was shown to be repressed by wild-type APC and activated by beta-catenin, and these effects were mediated through Tcf-4 binding sites in the c-MYC promoter. These results provide a molecular framework for understanding the previously enigmatic overexpression of c-MYC in colorectal cancers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉He, T C -- Sparks, A B -- Rago, C -- Hermeking, H -- Zawel, L -- da Costa, L T -- Morin, P J -- Vogelstein, B -- Kinzler, K W -- CA57345/CA/NCI NIH HHS/ -- CA62924/CA/NCI NIH HHS/ -- GM07309/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1998 Sep 4;281(5382):1509-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Johns Hopkins Oncology Center, 424 North Bond Street, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9727977" target="_blank"〉PubMed〈/a〉
    Keywords: Adenomatous Polyposis Coli Protein ; Binding Sites ; Cell Line ; Colorectal Neoplasms/*genetics ; Cytoskeletal Proteins/genetics/metabolism ; *Gene Expression Regulation, Neoplastic ; *Genes, APC ; Genes, Reporter ; *Genes, myc ; HT29 Cells ; Humans ; Mutation ; Promoter Regions, Genetic ; Proto-Oncogene Proteins c-myc/metabolism ; Signal Transduction ; TCF Transcription Factors ; *Trans-Activators ; Transcription Factor 7-Like 2 Protein ; Transcription Factors/metabolism ; Transcription, Genetic ; beta Catenin
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Tet-mediated formation of 5-carboxylcytosine and its excision by TDG in mammalian DNA (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-06
    Description: The prevalent DNA modification in higher organisms is the methylation of cytosine to 5-methylcytosine (5mC), which is partially converted to 5-hydroxymethylcytosine (5hmC) by the Tet (ten eleven translocation) family of dioxygenases. Despite their importance in epigenetic regulation, it is unclear how these cytosine modifications are reversed. Here, we demonstrate that 5mC and 5hmC in DNA are oxidized to 5-carboxylcytosine (5caC) by Tet dioxygenases in vitro and in cultured cells. 5caC is specifically recognized and excised by thymine-DNA glycosylase (TDG). Depletion of TDG in mouse embyronic stem cells leads to accumulation of 5caC to a readily detectable level. These data suggest that oxidation of 5mC by Tet proteins followed by TDG-mediated base excision of 5caC constitutes a pathway for active DNA demethylation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3462231/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3462231/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉He, Yu-Fei -- Li, Bin-Zhong -- Li, Zheng -- Liu, Peng -- Wang, Yang -- Tang, Qingyu -- Ding, Jianping -- Jia, Yingying -- Chen, Zhangcheng -- Li, Lin -- Sun, Yan -- Li, Xiuxue -- Dai, Qing -- Song, Chun-Xiao -- Zhang, Kangling -- He, Chuan -- Xu, Guo-Liang -- 1S10RR027643-01/RR/NCRR NIH HHS/ -- GM071440/GM/NIGMS NIH HHS/ -- R01 GM071440/GM/NIGMS NIH HHS/ -- S10 RR027643/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2011 Sep 2;333(6047):1303-7. doi: 10.1126/science.1210944. Epub 2011 Aug 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Group of DNA Metabolism, State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, Shanghai 200031, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21817016" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methylcytosine/metabolism ; Animals ; Cell Line ; Cytosine/*analogs & derivatives/metabolism ; DNA/*metabolism ; DNA Methylation ; DNA-Binding Proteins/genetics/*metabolism ; Embryonic Stem Cells ; HEK293 Cells ; Humans ; Induced Pluripotent Stem Cells/metabolism ; Mice ; Oxidation-Reduction ; Proto-Oncogene Proteins/genetics/*metabolism ; RNA, Small Interfering ; Thymine DNA Glycosylase/genetics/*metabolism ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Single-base mapping of m6A by an antibody-independent method (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉〈i〉N〈/i〉〈sup〉6〈/sup〉-methyladenosine (m〈sup〉6〈/sup〉A) is one of the most abundant messenger RNA modifications in eukaryotes involved in various pivotal processes of RNA metabolism. The most popular high-throughput m〈sup〉6〈/sup〉A identification method depends on the anti-m〈sup〉6〈/sup〉A antibody but suffers from poor reproducibility and limited resolution. Exact location information is of great value for understanding the dynamics, machinery, and functions of m〈sup〉6〈/sup〉A. Here, we developed a precise and high-throughput antibody-independent m〈sup〉6〈/sup〉A identification method based on the m〈sup〉6〈/sup〉A-sensitive RNA endoribonuclease recognizing ACA motif (m〈sup〉6〈/sup〉A-sensitive RNA-Endoribonuclease–Facilitated sequencing or m〈sup〉6〈/sup〉A-REF-seq). Whole-transcriptomic, single-base m〈sup〉6〈/sup〉A maps generated by m〈sup〉6〈/sup〉A-REF-seq quantitatively displayed an explicit distribution pattern with enrichment near stop codons. We used independent methods to validate methylation status and abundance of individual m〈sup〉6〈/sup〉A sites, confirming the high reliability and accuracy of m〈sup〉6〈/sup〉A-REF-seq. We applied this method on five tissues from human, mouse, and rat, showing that m〈sup〉6〈/sup〉A sites are conserved with single-nucleotide specificity and tend to cluster among species.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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  • 10
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    RNA modifications modulate gene expression during development (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-09-28
    Description: RNA modifications have recently emerged as critical posttranscriptional regulators of gene expression programs. They affect diverse eukaryotic biological processes, and the correct deposition of many of these modifications is required for normal development. Messenger RNA (mRNA) modifications regulate various aspects of mRNA metabolism. For example, N 6 -methyladenosine (m 6 A) affects the translation and stability of the modified transcripts, thus providing a mechanism to coordinate the regulation of groups of transcripts during cell state maintenance and transition. Similarly, some modifications in transfer RNAs are essential for RNA structure and function. Others are deposited in response to external cues and adapt global protein synthesis and gene-specific translational accordingly and thereby facilitate proper development.
    Keywords: Development, Molecular Biology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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