ALBERT

Beschreibung: Copy number variants (CNVs) account for a major proportion of human genetic polymorphism and have been predicted to have an important role in genetic susceptibility to common disease. To address this we undertook a large, direct genome-wide study of association between CNVs and eight common human diseases. Using a purpose-designed array we typed approximately 19,000 individuals into distinct copy-number classes at 3,432 polymorphic CNVs, including an estimated approximately 50% of all common CNVs larger than 500 base pairs. We identified several biological artefacts that lead to false-positive associations, including systematic CNV differences between DNAs derived from blood and cell lines. Association testing and follow-up replication analyses confirmed three loci where CNVs were associated with disease-IRGM for Crohn's disease, HLA for Crohn's disease, rheumatoid arthritis and type 1 diabetes, and TSPAN8 for type 2 diabetes-although in each case the locus had previously been identified in single nucleotide polymorphism (SNP)-based studies, reflecting our observation that most common CNVs that are well-typed on our array are well tagged by SNPs and so have been indirectly explored through SNP studies. We conclude that common CNVs that can be typed on existing platforms are unlikely to contribute greatly to the genetic basis of common human diseases.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2892339/" 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/PMC2892339/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wellcome Trust Case Control Consortium -- Craddock, Nick -- Hurles, Matthew E -- Cardin, Niall -- Pearson, Richard D -- Plagnol, Vincent -- Robson, Samuel -- Vukcevic, Damjan -- Barnes, Chris -- Conrad, Donald F -- Giannoulatou, Eleni -- Holmes, Chris -- Marchini, Jonathan L -- Stirrups, Kathy -- Tobin, Martin D -- Wain, Louise V -- Yau, Chris -- Aerts, Jan -- Ahmad, Tariq -- Andrews, T Daniel -- Arbury, Hazel -- Attwood, Anthony -- Auton, Adam -- Ball, Stephen G -- Balmforth, Anthony J -- Barrett, Jeffrey C -- Barroso, Ines -- Barton, Anne -- Bennett, Amanda J -- Bhaskar, Sanjeev -- Blaszczyk, Katarzyna -- Bowes, John -- Brand, Oliver J -- Braund, Peter S -- Bredin, Francesca -- Breen, Gerome -- Brown, Morris J -- Bruce, Ian N -- Bull, Jaswinder -- Burren, Oliver S -- Burton, John -- Byrnes, Jake -- Caesar, Sian -- Clee, Chris M -- Coffey, Alison J -- Connell, John M C -- Cooper, Jason D -- Dominiczak, Anna F -- Downes, Kate -- Drummond, Hazel E -- Dudakia, Darshna -- Dunham, Andrew -- Ebbs, Bernadette -- Eccles, Diana -- Edkins, Sarah -- Edwards, Cathryn -- Elliot, Anna -- Emery, Paul -- Evans, David M -- Evans, Gareth -- Eyre, Steve -- Farmer, Anne -- Ferrier, I Nicol -- Feuk, Lars -- Fitzgerald, Tomas -- Flynn, Edward -- Forbes, Alistair -- Forty, Liz -- Franklyn, Jayne A -- Freathy, Rachel M -- Gibbs, Polly -- Gilbert, Paul -- Gokumen, Omer -- Gordon-Smith, Katherine -- Gray, Emma -- Green, Elaine -- Groves, Chris J -- Grozeva, Detelina -- Gwilliam, Rhian -- Hall, Anita -- Hammond, Naomi -- Hardy, Matt -- Harrison, Pile -- Hassanali, Neelam -- Hebaishi, Husam -- Hines, Sarah -- Hinks, Anne -- Hitman, Graham A -- Hocking, Lynne -- Howard, Eleanor -- Howard, Philip -- Howson, Joanna M M -- Hughes, Debbie -- Hunt, Sarah -- Isaacs, John D -- Jain, Mahim -- Jewell, Derek P -- Johnson, Toby -- Jolley, Jennifer D -- Jones, Ian R -- Jones, Lisa A -- Kirov, George -- Langford, Cordelia F -- Lango-Allen, Hana -- Lathrop, G Mark -- Lee, James -- Lee, Kate L -- Lees, Charlie -- Lewis, Kevin -- Lindgren, Cecilia M -- Maisuria-Armer, Meeta -- Maller, Julian -- Mansfield, John -- Martin, Paul -- Massey, Dunecan C O -- McArdle, Wendy L -- McGuffin, Peter -- McLay, Kirsten E -- Mentzer, Alex -- Mimmack, Michael L -- Morgan, Ann E -- Morris, Andrew P -- Mowat, Craig -- Myers, Simon -- Newman, William -- Nimmo, Elaine R -- O'Donovan, Michael C -- Onipinla, Abiodun -- Onyiah, Ifejinelo -- Ovington, Nigel R -- Owen, Michael J -- Palin, Kimmo -- Parnell, Kirstie -- Pernet, David -- Perry, John R B -- Phillips, Anne -- Pinto, Dalila -- Prescott, Natalie J -- Prokopenko, Inga -- Quail, Michael A -- Rafelt, Suzanne -- Rayner, Nigel W -- Redon, Richard -- Reid, David M -- Renwick -- Ring, Susan M -- Robertson, Neil -- Russell, Ellie -- St Clair, David -- Sambrook, Jennifer G -- Sanderson, Jeremy D -- Schuilenburg, Helen -- Scott, Carol E -- Scott, Richard -- Seal, Sheila -- Shaw-Hawkins, Sue -- Shields, Beverley M -- Simmonds, Matthew J -- Smyth, Debbie J -- Somaskantharajah, Elilan -- Spanova, Katarina -- Steer, Sophia -- Stephens, Jonathan -- Stevens, Helen E -- Stone, Millicent A -- Su, Zhan -- Symmons, Deborah P M -- Thompson, John R -- Thomson, Wendy -- Travers, Mary E -- Turnbull, Clare -- Valsesia, Armand -- Walker, Mark -- Walker, Neil M -- Wallace, Chris -- Warren-Perry, Margaret -- Watkins, Nicholas A -- Webster, John -- Weedon, Michael N -- Wilson, Anthony G -- Woodburn, Matthew -- Wordsworth, B Paul -- Young, Allan H -- Zeggini, Eleftheria -- Carter, Nigel P -- Frayling, Timothy M -- Lee, Charles -- McVean, Gil -- Munroe, Patricia B -- Palotie, Aarno -- Sawcer, Stephen J -- Scherer, Stephen W -- Strachan, David P -- Tyler-Smith, Chris -- Brown, Matthew A -- Burton, Paul R -- Caulfield, Mark J -- Compston, Alastair -- Farrall, Martin -- Gough, Stephen C L -- Hall, Alistair S -- Hattersley, Andrew T -- Hill, Adrian V S -- Mathew, Christopher G -- Pembrey, Marcus -- Satsangi, Jack -- Stratton, Michael R -- Worthington, Jane -- Deloukas, Panos -- Duncanson, Audrey -- Kwiatkowski, Dominic P -- McCarthy, Mark I -- Ouwehand, Willem -- Parkes, Miles -- Rahman, Nazneen -- Todd, John A -- Samani, Nilesh J -- Donnelly, Peter -- 061858/Wellcome Trust/United Kingdom -- 083948/Wellcome Trust/United Kingdom -- 089989/Wellcome Trust/United Kingdom -- 090532/Wellcome Trust/United Kingdom -- 17552/Arthritis Research UK/United Kingdom -- CZB/4/540/Chief Scientist Office/United Kingdom -- ETM/137/Chief Scientist Office/United Kingdom -- ETM/75/Chief Scientist Office/United Kingdom -- G0000934/Medical Research Council/United Kingdom -- G0400874/Medical Research Council/United Kingdom -- G0500115/Medical Research Council/United Kingdom -- G0501942/Medical Research Council/United Kingdom -- G0600329/Medical Research Council/United Kingdom -- G0600705/Medical Research Council/United Kingdom -- G0700491/Medical Research Council/United Kingdom -- G0701003/Medical Research Council/United Kingdom -- G0701420/Medical Research Council/United Kingdom -- G0701810/Medical Research Council/United Kingdom -- G0701810(85517)/Medical Research Council/United Kingdom -- G0800383/Medical Research Council/United Kingdom -- G0800509/Medical Research Council/United Kingdom -- G0800759/Medical Research Council/United Kingdom -- G19/9/Medical Research Council/United Kingdom -- G90/106/Medical Research Council/United Kingdom -- G9521010/Medical Research Council/United Kingdom -- MC_UP_A390_1107/Medical Research Council/United Kingdom -- RG/09/012/28096/British Heart Foundation/United Kingdom -- Wellcome Trust/United Kingdom -- England -- Nature. 2010 Apr 1;464(7289):713-20. doi: 10.1038/nature08979.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20360734" target="_blank"〉PubMed〈/a〉

Beschreibung: Pulsed gamma rays have been detected with the Fermi Large Area Telescope (LAT) from more than 20 millisecond pulsars (MSPs), some of which were discovered in radio observations of bright, unassociated LAT sources. We have fit the radio and gamma-ray light curves of 19 LAT-detected MSPs in the context of geometric, outermagnetospheric emission models assuming the retarded vacuum dipole magnetic field using a Markov chain Monte Carlo maximum likelihood technique. We find that, in many cases, the models are able to reproduce the observed light curves well and provide constraints on the viewing geometries that are in agreement with those from radio polarization measurements. Additionally, for some MSPs we constrain the altitudes of both the gamma-ray and radio emission regions. The best-fit magnetic inclination angles are found to cover a broader range than those of non-recycled gamma-ray pulsars.

Beschreibung: Millisecond pulsars (MSPs) are a growing class of gamma-ray emitters. Pulsed gamma-ray signals have been detected from more than 40 MSPs with the Fermi Large Area Telescope (LAT). The wider radio beams and more compact magnetospheres of MSPs enable studies of emission geometries over a broader range of phase space than non-recycled radio-loud gamma-ray pulsars. We have modeled the gamma-ray light curves of 40 LAT-detected MSPs using geometric emission models assuming a vacuum retarded-dipole magnetic field. We modeled the radio profiles using a single-altitude hollow-cone beam, with a core component when indicated by polarimetry; however, for MSPs with gamma-ray and radio light curve peaks occurring at nearly the same rotational phase, we assume that the radio emission is co-located with the gamma rays and caustic in nature. The best-fit parameters and confidence intervals are determined using amaximum likelihood technique.We divide the light curves into three model classes, with gamma-ray peaks trailing (Class I), aligned (Class II), or leading (Class III) the radio peaks. Outer gap and slot gap (two-pole caustic) models best fit roughly equal numbers of Class I and II, while Class III are exclusively fit with pair-starved polar cap models. Distinguishing between the model classes based on typical derived parameters is difficult. We explore the evolution of the magnetic inclination angle with period and spin-down power, finding possible correlations. While the presence of significant off-peak emission can often be used as a discriminator between outer gap and slot gap models, a hybrid model may be needed.

Beschreibung: Since the discovery of the first eight gamma-ray millisecond pulsars (MSPs) by the Fermi Large Area Telescope, this population has been steadily expanding. Four of the more recent detections, PSR J00340534, PSR J1939+2134 (B1937+21; the first MSP ever discovered), PSR J1959+2048 (B1957+20; the first discovery of a black widow system), and PSR J2214+3000, exhibit a phenomenon not present in the original discoveries: nearly phase-aligned radio and gamma-ray light curves (LCs). To account for the phase alignment, we explore models where both the radio and gamma-ray emission originate either in the outer magnetosphere near the light cylinder or near the polar caps. Using a Markov Chain Monte Carlo technique to search for best-fit model parameters, we obtain reasonable LC fits for the first three of these MSPs in the context of altitude-limited outer gap (alOG) and two-pole caustic (alTPC) geometries (for both gamma-ray and radio emission). These models differ from the standard outer gap (OG)/two-pole caustic (TPC) models in two respects: the radio emission originates in caustics at relatively high altitudes compared to the usual conal radio beams, and we allow both the minimum and maximum altitudes of the gamma-ray and radio emission regions to vary within a limited range (excluding the minimum gamma-ray altitude of the alTPC model, which is kept constant at the stellar radius, and that of the alOG model, which is set to the position-dependent null charge surface altitude). Alternatively, phase-aligned solutions also exist for emission originating near the stellar surface in a slot gap scenario (low-altitude slot gap (laSG) models). We find that the alTPC models provide slightly better LC fits than the alOG models, and both of these give better fits than the laSG models (for the limited range of parameters considered in the case of the laSG models). Thus, our fits imply that the phase-aligned LCs are likely of caustic origin, produced in the outer magnetosphere, and that the radio emission for these pulsars may come from close to the light cylinder. In addition, we were able to constrain the minimum and maximum emission altitudes with typical uncertainties of 30% of the light cylinder radius. Our results therefore describe a third gamma-ray MSP subclass, in addition to the two previously found by Venter et al.: those with LCs fit by standard OG/TPC models and those with LCs fit by pair-starved polar cap models.