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  • 1
    Publication Date: 2014-10-29
    Description: Isolating compositional information in biological X-ray imaging can be problematic as such information is conflated with thickness and density variations when viewing in projection through a sample. We demonstrate an effective method for identifying variations in material composition by simultaneously using the quantitative phase and magnitude images provided through soft X-ray ptychography. Using this approach we show significantly increased contrast and improved reliability of the identification of intracellular features from uncharacterised samples. While demonstrated for X-ray ptychography, this method is immediately applicable to electron and optical microscopy methods where the complex transmission function of the sample is recovered. Scientific Reports 4 doi: 10.1038/srep06796
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 2
    Publication Date: 2012-07-27
    Description: Medulloblastoma, the most common malignant paediatric brain tumour, is currently treated with nonspecific cytotoxic therapies including surgery, whole-brain radiation, and aggressive chemotherapy. As medulloblastoma exhibits marked intertumoural heterogeneity, with at least four distinct molecular variants, previous attempts to identify targets for therapy have been underpowered because of small samples sizes. Here we report somatic copy number aberrations (SCNAs) in 1,087 unique medulloblastomas. SCNAs are common in medulloblastoma, and are predominantly subgroup-enriched. The most common region of focal copy number gain is a tandem duplication of SNCAIP, a gene associated with Parkinson's disease, which is exquisitely restricted to Group 4alpha. Recurrent translocations of PVT1, including PVT1-MYC and PVT1-NDRG1, that arise through chromothripsis are restricted to Group 3. Numerous targetable SCNAs, including recurrent events targeting TGF-beta signalling in Group 3, and NF-kappaB signalling in Group 4, suggest future avenues for rational, targeted therapy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3683624/" 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/PMC3683624/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Northcott, Paul A -- Shih, David J H -- Peacock, John -- Garzia, Livia -- Morrissy, A Sorana -- Zichner, Thomas -- Stutz, Adrian M -- Korshunov, Andrey -- Reimand, Juri -- Schumacher, Steven E -- Beroukhim, Rameen -- Ellison, David W -- Marshall, Christian R -- Lionel, Anath C -- Mack, Stephen -- Dubuc, Adrian -- Yao, Yuan -- Ramaswamy, Vijay -- Luu, Betty -- Rolider, Adi -- Cavalli, Florence M G -- Wang, Xin -- Remke, Marc -- Wu, Xiaochong -- Chiu, Readman Y B -- Chu, Andy -- Chuah, Eric -- Corbett, Richard D -- Hoad, Gemma R -- Jackman, Shaun D -- Li, Yisu -- Lo, Allan -- Mungall, Karen L -- Nip, Ka Ming -- Qian, Jenny Q -- Raymond, Anthony G J -- Thiessen, Nina T -- Varhol, Richard J -- Birol, Inanc -- Moore, Richard A -- Mungall, Andrew J -- Holt, Robert -- Kawauchi, Daisuke -- Roussel, Martine F -- Kool, Marcel -- Jones, David T W -- Witt, Hendrick -- Fernandez-L, Africa -- Kenney, Anna M -- Wechsler-Reya, Robert J -- Dirks, Peter -- Aviv, Tzvi -- Grajkowska, Wieslawa A -- Perek-Polnik, Marta -- Haberler, Christine C -- Delattre, Olivier -- Reynaud, Stephanie S -- Doz, Francois F -- Pernet-Fattet, Sarah S -- Cho, Byung-Kyu -- Kim, Seung-Ki -- Wang, Kyu-Chang -- Scheurlen, Wolfram -- Eberhart, Charles G -- Fevre-Montange, Michelle -- Jouvet, Anne -- Pollack, Ian F -- Fan, Xing -- Muraszko, Karin M -- Gillespie, G Yancey -- Di Rocco, Concezio -- Massimi, Luca -- Michiels, Erna M C -- Kloosterhof, Nanne K -- French, Pim J -- Kros, Johan M -- Olson, James M -- Ellenbogen, Richard G -- Zitterbart, Karel -- Kren, Leos -- Thompson, Reid C -- Cooper, Michael K -- Lach, Boleslaw -- McLendon, Roger E -- Bigner, Darell D -- Fontebasso, Adam -- Albrecht, Steffen -- Jabado, Nada -- Lindsey, Janet C -- Bailey, Simon -- Gupta, Nalin -- Weiss, William A -- Bognar, Laszlo -- Klekner, Almos -- Van Meter, Timothy E -- Kumabe, Toshihiro -- Tominaga, Teiji -- Elbabaa, Samer K -- Leonard, Jeffrey R -- Rubin, Joshua B -- Liau, Linda M -- Van Meir, Erwin G -- Fouladi, Maryam -- Nakamura, Hideo -- Cinalli, Giuseppe -- Garami, Miklos -- Hauser, Peter -- Saad, Ali G -- Iolascon, Achille -- Jung, Shin -- Carlotti, Carlos G -- Vibhakar, Rajeev -- Ra, Young Shin -- Robinson, Shenandoah -- Zollo, Massimo -- Faria, Claudia C -- Chan, Jennifer A -- Levy, Michael L -- Sorensen, Poul H B -- Meyerson, Matthew -- Pomeroy, Scott L -- Cho, Yoon-Jae -- Bader, Gary D -- Tabori, Uri -- Hawkins, Cynthia E -- Bouffet, Eric -- Scherer, Stephen W -- Rutka, James T -- Malkin, David -- Clifford, Steven C -- Jones, Steven J M -- Korbel, Jan O -- Pfister, Stefan M -- Marra, Marco A -- Taylor, Michael D -- AT1-112286/Canadian Institutes of Health Research/Canada -- CA116804/CA/NCI NIH HHS/ -- CA138292/CA/NCI NIH HHS/ -- CA159859/CA/NCI NIH HHS/ -- CA86335/CA/NCI NIH HHS/ -- K08 NS059790/NS/NINDS NIH HHS/ -- P20 CA151129/CA/NCI NIH HHS/ -- P30 CA138292/CA/NCI NIH HHS/ -- P30 HD018655/HD/NICHD NIH HHS/ -- P41 GM103504/GM/NIGMS NIH HHS/ -- R01 CA086335/CA/NCI NIH HHS/ -- R01 CA109467/CA/NCI NIH HHS/ -- R01 CA114567/CA/NCI NIH HHS/ -- R01 CA116804/CA/NCI NIH HHS/ -- R01 CA148621/CA/NCI NIH HHS/ -- R01 CA155360/CA/NCI NIH HHS/ -- R01 CA159859/CA/NCI NIH HHS/ -- R01 CA163737/CA/NCI NIH HHS/ -- R01 NS061070/NS/NINDS NIH HHS/ -- England -- Nature. 2012 Aug 2;488(7409):49-56. doi: 10.1038/nature11327.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Developmental & Stem Cell Biology Program, The Hospital for Sick Children, Toronto, Ontario M5G 1L7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22832581" target="_blank"〉PubMed〈/a〉
    Keywords: Carrier Proteins/genetics ; Cerebellar Neoplasms/*classification/*genetics/metabolism ; Child ; DNA Copy Number Variations/genetics ; Gene Duplication/genetics ; Genes, myc/genetics ; Genome, Human/*genetics ; Genomic Structural Variation/*genetics ; Genomics ; Hedgehog Proteins/metabolism ; Humans ; Medulloblastoma/*classification/*genetics/metabolism ; NF-kappa B/metabolism ; Nerve Tissue Proteins/genetics ; Oncogene Proteins, Fusion/genetics ; Proteins/genetics ; RNA, Long Noncoding ; Signal Transduction ; Transforming Growth Factor beta/metabolism ; Translocation, Genetic/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2011-04-18
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 4
    Publication Date: 2011-05-04
    Description: Vasectomy is a well accepted global contraceptive approach frequently associated with epididymal granuloma and sperm autoantibody formation. To understand the long-term sequelae of vasectomy, we investigated the early immune response in vasectomized mice. Vasectomy leads to rapid epithelial cell apoptosis and necrosis, persistent inflammation, and sperm granuloma formation in the epididymis. Vasectomized B6AF1 mice did not mount autoimmune response but instead developed sperm antigen-specific tolerance, documented as resistance to immunization-induced experimental autoimmune orchitis (EAO) but not experimental autoimmune encephalomyelitis. Strikingly, tolerance switches over to pathologic autoimmune state following concomitant CD4+CD25+Foxp3+ regulatory T cell (Treg) depletion: unilaterally vasectomized mice produce dominant autoantibodies to an orchitogenic antigen (zonadhesin), and develop CD4 T-cell– and antibody-dependent bilateral autoimmune orchitis. Therefore, (i) Treg normally prevents spontaneous organ-specific autoimmunity induction by persistent endogenous danger signal, and (ii) autoantigenic stimulation with sterile autoinflammation can lead to tolerance. Finally, postvasectomy tolerance occurs in B6AF1, C57BL/6, and A/J strains. However, C57BL/6 mice resisted EAO after 60% Treg depletion, but developed EAO after 97% Treg reduction. Therefore, variance in intrinsic Treg function—a possible genetic trait—can influence the divergent tolerogenic versus autoimmune response to vasectomy.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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