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  • 1
    Publication Date: 2013-07-06
    Description: Motivation: Due to the high complexity of metabolome, the comprehensive 2D gas chromatography time-of-flight mass spectrometry (GC x GC-TOF MS) is considered as a powerful analytical platform for metabolomics study. However, the applications of GC x GC-TOF MS in metabolomics are not popular owing to the lack of bioinformatics system for data analysis. Results: We developed a computational platform entitled metabolomics profiling pipeline (MetPP) for analysis of metabolomics data acquired on a GC x GC-TOF MS system. MetPP can process peak filtering and merging, retention index matching, peak list alignment, normalization, statistical significance tests and pattern recognition, using the peak lists deconvoluted from the instrument data as its input. The performance of MetPP software was tested with two sets of experimental data acquired in a spike-in experiment and a biomarker discovery experiment, respectively. MetPP not only correctly aligned the spiked-in metabolite standards from the experimental data, but also correctly recognized their concentration difference between sample groups. For analysis of the biomarker discovery data, 15 metabolites were recognized with significant concentration difference between the sample groups and these results agree with the literature results of histological analysis, demonstrating the effectiveness of applying MetPP software for disease biomarker discovery. Availability: The source code of MetPP is available at http://metaopen.sourceforge.net Contact: xiang.zhang@louisville.edu Supplementary information: Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
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  • 2
    Publication Date: 2016-05-06
    Description: Dicer participates in heterochromatin formation in fission yeast and plants. However, whether it has a similar role in mammals remains controversial. Here we showed that the human Dicer protein interacts with SIRT7, an NAD + -dependent H3K18Ac (acetylated lysine 18 of histone H3) deacetylase, and holds a proportion of SIRT7 in the cytoplasm. Dicer knockdown led to an increase of chromatin-associated SIRT7 and simultaneously a decrease of cytoplasmic SIRT7, while its overexpression induced SIRT7 reduction in the chromatin-associated fraction and increment in the cytoplasm. Furthermore, DNA damaging agents promoted Dicer expression, leading to decreased level of chromatin-associated SIRT7 and increased level of H3K18Ac, which can be alleviated by Dicer knockdown. Taken together with that H3K18Ac was exclusively associated with the chromatin, our findings suggest that Dicer induction by DNA damaging treatments prevents H3K18Ac deacetylation, probably by trapping more SIRT7 in the cytoplasm.
    Keywords: Protein-protein interaction, Repair
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
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  • 3
    Publication Date: 2016-06-16
    Description: Motivation: The three-dimensional structure of genomes makes it possible for genomic regions not adjacent in the primary sequence to be spatially proximal. These DNA contacts have been found to be related to various molecular activities. Previous methods for analyzing DNA contact maps obtained from Hi-C experiments have largely focused on studying individual interactions, forming spatial clusters composed of contiguous blocks of genomic locations, or classifying these clusters into general categories based on some global properties of the contact maps. Results: Here, we describe a novel computational method that can flexibly identify small clusters of spatially proximal genomic regions based on their local contact patterns. Using simulated data that highly resemble Hi-C data obtained from real genome structures, we demonstrate that our method identifies spatial clusters that are more compact than methods previously used for clustering genomic regions based on DNA contact maps. The clusters identified by our method enable us to confirm functionally related genomic regions previously reported to be spatially proximal in different species. We further show that each genomic region can be assigned a numeric affinity value that indicates its degree of participation in each local cluster, and these affinity values correlate quantitatively with DNase I hypersensitivity, gene expression, super enhancer activities and replication timing in a cell type specific manner. We also show that these cluster affinity values can precisely define boundaries of reported topologically associating domains, and further define local sub-domains within each domain. Availability and implementation: The source code of BNMF and tutorials on how to use the software to extract local clusters from contact maps are available at http://yiplab.cse.cuhk.edu.hk/bnmf/ . Contact: kevinyip@cse.cuhk.edu.hk Supplementary information: Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
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  • 4
    Publication Date: 2016-07-08
    Description: Mps1 kinase regulates tumor cell viability via its novel role in mitochondria Cell Death and Disease 7, e2292 (July 2016). doi:10.1038/cddis.2016.193 Authors: X Zhang, Y Ling, Y Guo, Y Bai, X Shi, F Gong, P Tan, Y Zhang, C Wei, X He, A Ramirez, X Liu, C Cao, H Zhong, Q Xu & R Z Ma
    Electronic ISSN: 2041-4889
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 5
    Publication Date: 2015-04-24
    Description: The primary objective of this study is to evaluate the applicability and the effectiveness of ground-penetrating radar (GPR) to identify a thin burnt soil layer, buried more than 2 m below the topographic surface at the Liangzhu Site, in Southeastern China. The site was chosen for its relatively challenging conditions of GPR techniques due to electrical conductivity and to the presence of peach tree roots that produced scattering. We completed the data acquisition by using 100 and 200 MHz antennas in TE and TM broadside and cross-polarized configurations. In the data processing and interpretation phase, we used GPR attribute analysis, including instantaneous phase and geometrical attributes. Validation analysis ground-truthing performed after the geophysical surveys, validated the GPR imaging, confirmed the electrical conductivity and relative dielectric permittivity (RDP) measurements performed at different depths, and allowed a reliable quantitative correlation between GPR results and subsurface physical properties. The research demonstrates that multiple antenna configurations in GPR data acquisition combined with attribute analysis can enhance the ability to characterize prehistoric archaeological remains even in complex subsurface conditions.
    Keywords: Marine Geosciences and Applied Geophysics
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 6
    Publication Date: 2012-09-01
    Description: Two-phase growth of high topography in eastern Tibet during the Cenozoic Nature Geoscience 5, 640 (2012). doi:10.1038/ngeo1538 Authors: E. Wang, E. Kirby, K. P. Furlong, M. van Soest, G. Xu, X. Shi, P. J. J. Kamp & K. V. Hodges High topography in eastern Tibet is thought to have formed when deep crust beneath the central Tibetan Plateau flowed towards the plateau margin, causing crustal thickening and surface uplift. Rapid exhumation starting about 10–15 million years ago is inferred to mark the onset of surface uplift and fluvial incision. Although geophysical data are consistent with weak crust capable of flow, it is unclear how the timing and amount of deformation adjacent to the Sichuan Basin during the Cenozoic era can be explained in this way. Here we use thermochronology to measure the cooling histories of rocks exposed in a section that stretches vertically over 3 km adjacent to the Sichuan Basin. Our thermal models of exhumation-driven cooling show that these rocks, and hence the plateau margin, were subject to slow, steady exhumation during early Cenozoic time, followed by two pulses of rapid exhumation, one beginning 30–25 million years ago and a second 10–15 million years ago that continues to present. Our findings imply that significant topographic relief existed adjacent to the Sichuan Basin before the Indo-Asian collision. Furthermore, the onset of Cenozoic mountain building probably pre-dated development of the weak lower crust, implying that early topography was instead formed during thickening of the upper crust along faults. We suggest that episodes of mountain building may reflect distinct geodynamic mechanisms of crustal thickening.
    Print ISSN: 1752-0894
    Electronic ISSN: 1752-0908
    Topics: Geosciences
    Published by Springer Nature
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  • 7
    Publication Date: 2014-12-12
    Description: Blocking autophagy enhanced cytotoxicity induced by recombinant human arginase in triple-negative breast cancer cells Cell Death and Disease 5, e1563 (December 2014). doi:10.1038/cddis.2014.503 Authors: Z Wang, X Shi, Y Li, J Fan, X Zeng, Z Xian, Z Wang, Y Sun, S Wang, P Song, S Zhao, H Hu & D Ju
    Electronic ISSN: 2041-4889
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 8
    Publication Date: 2015-01-15
    Description: Article It remains to be seen if high- T c superconductors rely on similar Fermi-surface instabilities as their BCS counterparts. Miao et al. study the high- T c compound LiFe 1−x Co x As with high-resolution ARPES and find a robust gap with Co doping that suggests the order parameter is not tied to such instabilities. Nature Communications doi: 10.1038/ncomms7056 Authors: H. Miao, T. Qian, X. Shi, P. Richard, T. K. Kim, M. Hoesch, L. Y. Xing, X.-C. Wang, C.-Q. Jin, J.-P. Hu, H. Ding
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 9
    Publication Date: 2010-12-18
    Description: Recognition of modified histone species by distinct structural domains within 'reader' proteins plays a critical role in the regulation of gene expression. Readers that simultaneously recognize histones with multiple marks allow transduction of complex chromatin modification patterns into specific biological outcomes. Here we report that chromatin regulator tripartite motif-containing 24 (TRIM24) functions in humans as a reader of dual histone marks by means of tandem plant homeodomain (PHD) and bromodomain (Bromo) regions. The three-dimensional structure of the PHD-Bromo region of TRIM24 revealed a single functional unit for combinatorial recognition of unmodified H3K4 (that is, histone H3 unmodified at lysine 4, H3K4me0) and acetylated H3K23 (histone H3 acetylated at lysine 23, H3K23ac) within the same histone tail. TRIM24 binds chromatin and oestrogen receptor to activate oestrogen-dependent genes associated with cellular proliferation and tumour development. Aberrant expression of TRIM24 negatively correlates with survival of breast cancer patients. The PHD-Bromo of TRIM24 provides a structural rationale for chromatin activation through a non-canonical histone signature, establishing a new route by which chromatin readers may influence cancer pathogenesis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3058826/" 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/PMC3058826/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tsai, Wen-Wei -- Wang, Zhanxin -- Yiu, Teresa T -- Akdemir, Kadir C -- Xia, Weiya -- Winter, Stefan -- Tsai, Cheng-Yu -- Shi, Xiaobing -- Schwarzer, Dirk -- Plunkett, William -- Aronow, Bruce -- Gozani, Or -- Fischle, Wolfgang -- Hung, Mien-Chie -- Patel, Dinshaw J -- Barton, Michelle Craig -- GM079641/GM/NIGMS NIH HHS/ -- GM081627/GM/NIGMS NIH HHS/ -- P01 GM081627/GM/NIGMS NIH HHS/ -- P01 GM081627-010003/GM/NIGMS NIH HHS/ -- P01 GM081627-020003/GM/NIGMS NIH HHS/ -- P30 EB009998/EB/NIBIB NIH HHS/ -- P30DK078392-01/DK/NIDDK NIH HHS/ -- T32 HD07325/HD/NICHD NIH HHS/ -- U54 RR025216/RR/NCRR NIH HHS/ -- UL1 TR000077/TR/NCATS NIH HHS/ -- England -- Nature. 2010 Dec 16;468(7326):927-32. doi: 10.1038/nature09542.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, Program in Genes and Development, Graduate School of Biomedical Sciences, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21164480" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Breast Neoplasms/*genetics/*metabolism/pathology ; Carrier Proteins/chemistry/genetics/*metabolism ; Cell Line, Tumor ; Chromatin/metabolism ; Chromatin Assembly and Disassembly ; Crystallography, X-Ray ; Estrogen Receptor alpha/metabolism ; Estrogens/metabolism ; *Gene Expression Regulation, Neoplastic/genetics ; HEK293 Cells ; Histones/chemistry/*metabolism ; Humans ; Methylation ; Protein Array Analysis ; Protein Binding ; Protein Structure, Tertiary ; Substrate Specificity ; Survival Rate
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2008-10-25
    Description: Determining the genetic basis of cancer requires comprehensive analyses of large collections of histopathologically well-classified primary tumours. Here we report the results of a collaborative study to discover somatic mutations in 188 human lung adenocarcinomas. DNA sequencing of 623 genes with known or potential relationships to cancer revealed more than 1,000 somatic mutations across the samples. Our analysis identified 26 genes that are mutated at significantly high frequencies and thus are probably involved in carcinogenesis. The frequently mutated genes include tyrosine kinases, among them the EGFR homologue ERBB4; multiple ephrin receptor genes, notably EPHA3; vascular endothelial growth factor receptor KDR; and NTRK genes. These data provide evidence of somatic mutations in primary lung adenocarcinoma for several tumour suppressor genes involved in other cancers--including NF1, APC, RB1 and ATM--and for sequence changes in PTPRD as well as the frequently deleted gene LRP1B. The observed mutational profiles correlate with clinical features, smoking status and DNA repair defects. These results are reinforced by data integration including single nucleotide polymorphism array and gene expression array. Our findings shed further light on several important signalling pathways involved in lung adenocarcinoma, and suggest new molecular targets for treatment.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2694412/" 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/PMC2694412/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ding, Li -- Getz, Gad -- Wheeler, David A -- Mardis, Elaine R -- McLellan, Michael D -- Cibulskis, Kristian -- Sougnez, Carrie -- Greulich, Heidi -- Muzny, Donna M -- Morgan, Margaret B -- Fulton, Lucinda -- Fulton, Robert S -- Zhang, Qunyuan -- Wendl, Michael C -- Lawrence, Michael S -- Larson, David E -- Chen, Ken -- Dooling, David J -- Sabo, Aniko -- Hawes, Alicia C -- Shen, Hua -- Jhangiani, Shalini N -- Lewis, Lora R -- Hall, Otis -- Zhu, Yiming -- Mathew, Tittu -- Ren, Yanru -- Yao, Jiqiang -- Scherer, Steven E -- Clerc, Kerstin -- Metcalf, Ginger A -- Ng, Brian -- Milosavljevic, Aleksandar -- Gonzalez-Garay, Manuel L -- Osborne, John R -- Meyer, Rick -- Shi, Xiaoqi -- Tang, Yuzhu -- Koboldt, Daniel C -- Lin, Ling -- Abbott, Rachel -- Miner, Tracie L -- Pohl, Craig -- Fewell, Ginger -- Haipek, Carrie -- Schmidt, Heather -- Dunford-Shore, Brian H -- Kraja, Aldi -- Crosby, Seth D -- Sawyer, Christopher S -- Vickery, Tammi -- Sander, Sacha -- Robinson, Jody -- Winckler, Wendy -- Baldwin, Jennifer -- Chirieac, Lucian R -- Dutt, Amit -- Fennell, Tim -- Hanna, Megan -- Johnson, Bruce E -- Onofrio, Robert C -- Thomas, Roman K -- Tonon, Giovanni -- Weir, Barbara A -- Zhao, Xiaojun -- Ziaugra, Liuda -- Zody, Michael C -- Giordano, Thomas -- Orringer, Mark B -- Roth, Jack A -- Spitz, Margaret R -- Wistuba, Ignacio I -- Ozenberger, Bradley -- Good, Peter J -- Chang, Andrew C -- Beer, David G -- Watson, Mark A -- Ladanyi, Marc -- Broderick, Stephen -- Yoshizawa, Akihiko -- Travis, William D -- Pao, William -- Province, Michael A -- Weinstock, George M -- Varmus, Harold E -- Gabriel, Stacey B -- Lander, Eric S -- Gibbs, Richard A -- Meyerson, Matthew -- Wilson, Richard K -- P50 CA070907/CA/NCI NIH HHS/ -- R01 CA154365/CA/NCI NIH HHS/ -- U19 CA084953/CA/NCI NIH HHS/ -- U19 CA084953-050003/CA/NCI NIH HHS/ -- U54 HG003067/HG/NHGRI NIH HHS/ -- U54 HG003067-04/HG/NHGRI NIH HHS/ -- U54 HG003273/HG/NHGRI NIH HHS/ -- England -- Nature. 2008 Oct 23;455(7216):1069-75. doi: 10.1038/nature07423.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Genome Center at Washington University, Department of Genetics, Washington University School of Medicine, St Louis, Missouri 63108, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18948947" target="_blank"〉PubMed〈/a〉
    Keywords: Adenocarcinoma, Bronchiolo-Alveolar/*genetics ; Female ; Gene Dosage ; Gene Expression Regulation, Neoplastic ; Genes, Tumor Suppressor ; Humans ; Lung Neoplasms/*genetics ; Male ; Mutation/*genetics ; Proto-Oncogenes/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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