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Author

Radu Dobrin

Bio: Radu Dobrin is an academic researcher from Janssen Pharmaceutica. The author has contributed to research in topics: Genome-wide association study & Expression quantitative trait loci. The author has an hindex of 22, co-authored 29 publications receiving 4335 citations. Previous affiliations of Radu Dobrin include Merck & Co. & Johnson & Johnson.

Papers
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Journal ArticleDOI
03 Aug 2006-Nature
TL;DR: This work uses short hairpin RNA (shRNA) loss-of-function techniques to downregulate a set of gene products whose expression patterns suggest self-renewal regulatory functions, and focuses on transcriptional regulators and identifies seven genes for which shRNA-mediated depletion negatively affects self-Renewal.
Abstract: We present an integrated approach to identify genetic mechanisms that control self-renewal in mouse embryonic stem cells. We use short hairpin RNA (shRNA) loss-of-function techniques to downregulate a set of gene products whose expression patterns suggest self-renewal regulatory functions. We focus on transcriptional regulators and identify seven genes for which shRNA-mediated depletion negatively affects self-renewal, including four genes with previously unrecognized roles in self-renewal. Perturbations of these gene products are combined with dynamic, global analyses of gene expression. Our studies suggest specific biological roles for these molecules and reveal the complexity of cell fate regulation in embryonic stem cells.

1,009 citations

Journal ArticleDOI
TL;DR: It is shown that a network's large-scale topological organization and its local subgraph structure mutually define and predict each other, as confirmed by direct measurements in five well studied cellular networks.
Abstract: Recent evidence indicates that the abundance of recurring elementary interaction patterns in complex networks, often called subgraphs or motifs, carry significant information about their function and overall organization. Yet, the underlying reasons for the variable quantity of different subgraph types, their propensity to form clusters, and their relationship with the networks' global organization remain poorly understood. Here we show that a network's large-scale topological organization and its local subgraph structure mutually define and predict each other, as confirmed by direct measurements in five well studied cellular networks. We also demonstrate the inherent existence of two distinct classes of subgraphs, and show that, in contrast to the low-density type II subgraphs, the highly abundant type I subgraphs cannot exist in isolation but must naturally aggregate into subgraph clusters. The identified topological framework may have important implications for our understanding of the origin and function of subgraphs in all complex networks.

318 citations

Journal ArticleDOI
TL;DR: Individual motifs aggregate into homologous motif clusters and a supercluster forming the backbone of the E. coli transcriptional regulatory network and play a central role in defining its global topological organization.
Abstract: Background Transcriptional regulation of cellular functions is carried out through a complex network of interactions among transcription factors and the promoter regions of genes and operons regulated by them.To better understand the system-level function of such networks simplification of their architecture was previously achieved by identifying the motifs present in the network, which are small, overrepresented, topologically distinct regulatory interaction patterns (subgraphs). However, the interaction of such motifs with each other, and their form of integration into the full network has not been previously examined.

247 citations

Journal ArticleDOI
TL;DR: NDEx helps expand the role of networks in scientific discourse and facilitates the integration of networks as data in publications, a step towards an ecosystem in which networks bearing data, hypotheses, and findings flow easily between scientists.
Abstract: Networks are a powerful and flexible methodology for expressing biological knowledge for computation and communication. Network-encoded information can include systematic screens for molecular interactions, biological relationships curated from literature, and outputs from analysis of Big Data. NDEx, the Network Data Exchange (www.ndexbio.org), is an online commons where scientists can upload, share, and publicly distribute networks. Networks in NDEx receive globally unique accession IDs and can be stored for private use, shared in pre-publication collaboration, or released for public access. Standard and novel data formats are accommodated in a flexible storage model. Organizations can use NDEx as a distribution channel for networks they generate or curate. Developers of bioinformatic applications can store and query NDEx networks via a common programmatic interface. NDEx helps expand the role of networks in scientific discourse and facilitates the integration of networks as data in publications. It is a step towards an ecosystem in which networks bearing data, hypotheses, and findings flow easily between scientists.

222 citations


Cited by
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Journal ArticleDOI
TL;DR: It is demonstrated in macrophages and B cells that collaborative interactions of the common factor PU.1 with small sets of macrophage- or B cell lineage-determining transcription factors establish cell-specific binding sites that are associated with the majority of promoter-distal H3K4me1-marked genomic regions.

9,620 citations

Journal ArticleDOI
John T. Lonsdale, Jeffrey Thomas, Mike Salvatore, Rebecca Phillips, Edmund Lo, Saboor Shad, Richard Hasz, Gary Walters, Fernando U. Garcia1, Nancy Young2, Barbara A. Foster3, Mike Moser3, Ellen Karasik3, Bryan Gillard3, Kimberley Ramsey3, Susan L. Sullivan, Jason Bridge, Harold Magazine, John Syron, Johnelle Fleming, Laura A. Siminoff4, Heather M. Traino4, Maghboeba Mosavel4, Laura Barker4, Scott D. Jewell5, Daniel C. Rohrer5, Dan Maxim5, Dana Filkins5, Philip Harbach5, Eddie Cortadillo5, Bree Berghuis5, Lisa Turner5, Eric Hudson5, Kristin Feenstra5, Leslie H. Sobin6, James A. Robb6, Phillip Branton, Greg E. Korzeniewski6, Charles Shive6, David Tabor6, Liqun Qi6, Kevin Groch6, Sreenath Nampally6, Steve Buia6, Angela Zimmerman6, Anna M. Smith6, Robin Burges6, Karna Robinson6, Kim Valentino6, Deborah Bradbury6, Mark Cosentino6, Norma Diaz-Mayoral6, Mary Kennedy6, Theresa Engel6, Penelope Williams6, Kenyon Erickson, Kristin G. Ardlie7, Wendy Winckler7, Gad Getz7, Gad Getz8, David S. DeLuca7, MacArthur Daniel MacArthur7, MacArthur Daniel MacArthur8, Manolis Kellis7, Alexander Thomson7, Taylor Young7, Ellen Gelfand7, Molly Donovan7, Yan Meng7, George B. Grant7, Deborah C. Mash9, Yvonne Marcus9, Margaret J. Basile9, Jun Liu8, Jun Zhu10, Zhidong Tu10, Nancy J. Cox11, Dan L. Nicolae11, Eric R. Gamazon11, Hae Kyung Im11, Anuar Konkashbaev11, Jonathan K. Pritchard11, Jonathan K. Pritchard12, Matthew Stevens11, Timothée Flutre11, Xiaoquan Wen11, Emmanouil T. Dermitzakis13, Tuuli Lappalainen13, Roderic Guigó, Jean Monlong, Michael Sammeth, Daphne Koller14, Alexis Battle14, Sara Mostafavi14, Mark I. McCarthy15, Manual Rivas15, Julian Maller15, Ivan Rusyn16, Andrew B. Nobel16, Fred A. Wright16, Andrey A. Shabalin16, Mike Feolo17, Nataliya Sharopova17, Anne Sturcke17, Justin Paschal17, James M. Anderson17, Elizabeth L. Wilder17, Leslie Derr17, Eric D. Green17, Jeffery P. Struewing17, Gary F. Temple17, Simona Volpi17, Joy T. Boyer17, Elizabeth J. Thomson17, Mark S. Guyer17, Cathy Ng17, Assya Abdallah17, Deborah Colantuoni17, Thomas R. Insel17, Susan E. Koester17, Roger Little17, Patrick Bender17, Thomas Lehner17, Yin Yao17, Carolyn C. Compton17, Jimmie B. Vaught17, Sherilyn Sawyer17, Nicole C. Lockhart17, Joanne P. Demchok17, Helen F. Moore17 
TL;DR: The Genotype-Tissue Expression (GTEx) project is described, which will establish a resource database and associated tissue bank for the scientific community to study the relationship between genetic variation and gene expression in human tissues.
Abstract: Genome-wide association studies have identified thousands of loci for common diseases, but, for the majority of these, the mechanisms underlying disease susceptibility remain unknown. Most associated variants are not correlated with protein-coding changes, suggesting that polymorphisms in regulatory regions probably contribute to many disease phenotypes. Here we describe the Genotype-Tissue Expression (GTEx) project, which will establish a resource database and associated tissue bank for the scientific community to study the relationship between genetic variation and gene expression in human tissues.

6,545 citations

01 Aug 2000
TL;DR: Assessment of medical technology in the context of commercialization with Bioentrepreneur course, which addresses many issues unique to biomedical products.
Abstract: BIOE 402. Medical Technology Assessment. 2 or 3 hours. Bioentrepreneur course. Assessment of medical technology in the context of commercialization. Objectives, competition, market share, funding, pricing, manufacturing, growth, and intellectual property; many issues unique to biomedical products. Course Information: 2 undergraduate hours. 3 graduate hours. Prerequisite(s): Junior standing or above and consent of the instructor.

4,833 citations

Journal ArticleDOI
Kristin G. Ardlie, David S. DeLuca, Ayellet V. Segrè, Timothy J. Sullivan, Taylor Young, Ellen Gelfand, Casandra A. Trowbridge, Julian Maller, Taru Tukiainen, Monkol Lek, Lucas D. Ward, Pouya Kheradpour, Benjamin Iriarte, Yan Meng, Cameron D. Palmer, Tõnu Esko, Wendy Winckler, Joel N. Hirschhorn, Manolis Kellis, Daniel G. MacArthur, Gad Getz, Andrey A. Shabalin, Gen Li, Yi-Hui Zhou, Andrew B. Nobel, Ivan Rusyn, Fred A. Wright, Tuuli Lappalainen, Pedro G. Ferreira, Halit Ongen, Manuel A. Rivas, Alexis Battle, Sara Mostafavi, Jean Monlong, Michael Sammeth, Marta Melé, Ferran Reverter, Jakob M. Goldmann, Daphne Koller, Roderic Guigó, Mark I. McCarthy, Emmanouil T. Dermitzakis, Eric R. Gamazon, Hae Kyung Im, Anuar Konkashbaev, Dan L. Nicolae, Nancy J. Cox, Timothée Flutre, Xiaoquan Wen, Matthew Stephens, Jonathan K. Pritchard, Zhidong Tu, Bin Zhang, Tao Huang, Quan Long, Luan Lin, Jialiang Yang, Jun Zhu, Jun Liu, Amanda Brown, Bernadette Mestichelli, Denee Tidwell, Edmund Lo, Mike Salvatore, Saboor Shad, Jeffrey A. Thomas, John T. Lonsdale, Michael T. Moser, Bryan Gillard, Ellen Karasik, Kimberly Ramsey, Christopher Choi, Barbara A. Foster, John Syron, Johnell Fleming, Harold Magazine, Rick Hasz, Gary Walters, Jason Bridge, Mark Miklos, Susan L. Sullivan, Laura Barker, Heather M. Traino, Maghboeba Mosavel, Laura A. Siminoff, Dana R. Valley, Daniel C. Rohrer, Scott D. Jewell, Philip A. Branton, Leslie H. Sobin, Mary Barcus, Liqun Qi, Jeffrey McLean, Pushpa Hariharan, Ki Sung Um, Shenpei Wu, David Tabor, Charles Shive, Anna M. Smith, Stephen A. Buia, Anita H. Undale, Karna Robinson, Nancy Roche, Kimberly M. Valentino, Angela Britton, Robin Burges, Debra Bradbury, Kenneth W. Hambright, John Seleski, Greg E. Korzeniewski, Kenyon Erickson, Yvonne Marcus, Jorge Tejada, Mehran Taherian, Chunrong Lu, Margaret J. Basile, Deborah C. Mash, Simona Volpi, Jeffery P. Struewing, Gary F. Temple, Joy T. Boyer, Deborah Colantuoni, Roger Little, Susan E. Koester, Latarsha J. Carithers, Helen M. Moore, Ping Guan, Carolyn C. Compton, Sherilyn Sawyer, Joanne P. Demchok, Jimmie B. Vaught, Chana A. Rabiner, Nicole C. Lockhart 
08 May 2015-Science
TL;DR: The landscape of gene expression across tissues is described, thousands of tissue-specific and shared regulatory expression quantitative trait loci (eQTL) variants are cataloged, complex network relationships are described, and signals from genome-wide association studies explained by eQTLs are identified.
Abstract: Understanding the functional consequences of genetic variation, and how it affects complex human disease and quantitative traits, remains a critical challenge for biomedicine. We present an analysi...

4,418 citations

01 Feb 2015
TL;DR: In this article, the authors describe the integrative analysis of 111 reference human epigenomes generated as part of the NIH Roadmap Epigenomics Consortium, profiled for histone modification patterns, DNA accessibility, DNA methylation and RNA expression.
Abstract: The reference human genome sequence set the stage for studies of genetic variation and its association with human disease, but epigenomic studies lack a similar reference. To address this need, the NIH Roadmap Epigenomics Consortium generated the largest collection so far of human epigenomes for primary cells and tissues. Here we describe the integrative analysis of 111 reference human epigenomes generated as part of the programme, profiled for histone modification patterns, DNA accessibility, DNA methylation and RNA expression. We establish global maps of regulatory elements, define regulatory modules of coordinated activity, and their likely activators and repressors. We show that disease- and trait-associated genetic variants are enriched in tissue-specific epigenomic marks, revealing biologically relevant cell types for diverse human traits, and providing a resource for interpreting the molecular basis of human disease. Our results demonstrate the central role of epigenomic information for understanding gene regulation, cellular differentiation and human disease.

4,409 citations