@article {7349, title = {DNA methylation signatures of chronic low-grade inflammation are associated with complex diseases.}, journal = {Genome Biol}, volume = {17}, year = {2016}, month = {2016 Dec 12}, pages = {255}, abstract = {

BACKGROUND: Chronic low-grade inflammation reflects a subclinical immune response implicated in the pathogenesis of complex diseases. Identifying genetic loci where DNA methylation is associated with chronic low-grade inflammation may reveal novel pathways or therapeutic targets for inflammation.

RESULTS: We performed a meta-analysis of epigenome-wide association studies (EWAS) of serum C-reactive protein (CRP), which is a sensitive marker of low-grade inflammation, in a large European population (n = 8863) and trans-ethnic replication in African Americans (n = 4111). We found differential methylation at 218 CpG sites to be associated with CRP (P < 1.15 {\texttimes} 10(-7)) in the discovery panel of European ancestry and replicated (P < 2.29 {\texttimes} 10(-4)) 58 CpG sites (45 unique loci) among African Americans. To further characterize the molecular and clinical relevance of the findings, we examined the association with gene expression, genetic sequence variants, and clinical outcomes. DNA methylation at nine (16\%) CpG sites was associated with whole blood gene expression in cis (P < 8.47 {\texttimes} 10(-5)), ten (17\%) CpG sites were associated with a nearby genetic variant (P < 2.50 {\texttimes} 10(-3)), and 51 (88\%) were also associated with at least one related cardiometabolic entity (P < 9.58 {\texttimes} 10(-5)). An additive weighted score of replicated CpG sites accounted for up to 6\% inter-individual variation (R2) of age-adjusted and sex-adjusted CRP, independent of known CRP-related genetic variants.

CONCLUSION: We have completed an EWAS of chronic low-grade inflammation and identified many novel genetic loci underlying inflammation that may serve as targets for the development of novel therapeutic interventions for inflammation.

}, issn = {1474-760X}, doi = {10.1186/s13059-016-1119-5}, author = {Ligthart, Symen and Marzi, Carola and Aslibekyan, Stella and Mendelson, Michael M and Conneely, Karen N and Tanaka, Toshiko and Colicino, Elena and Waite, Lindsay L and Joehanes, Roby and Guan, Weihua and Brody, Jennifer A and Elks, Cathy and Marioni, Riccardo and Jhun, Min A and Agha, Golareh and Bressler, Jan and Ward-Caviness, Cavin K and Chen, Brian H and Huan, Tianxiao and Bakulski, Kelly and Salfati, Elias L and Fiorito, Giovanni and Wahl, Simone and Schramm, Katharina and Sha, Jin and Hernandez, Dena G and Just, Allan C and Smith, Jennifer A and Sotoodehnia, Nona and Pilling, Luke C and Pankow, James S and Tsao, Phil S and Liu, Chunyu and Zhao, Wei and Guarrera, Simonetta and Michopoulos, Vasiliki J and Smith, Alicia K and Peters, Marjolein J and Melzer, David and Vokonas, Pantel and Fornage, Myriam and Prokisch, Holger and Bis, Joshua C and Chu, Audrey Y and Herder, Christian and Grallert, Harald and Yao, Chen and Shah, Sonia and McRae, Allan F and Lin, Honghuang and Horvath, Steve and Fallin, Daniele and Hofman, Albert and Wareham, Nicholas J and Wiggins, Kerri L and Feinberg, Andrew P and Starr, John M and Visscher, Peter M and Murabito, Joanne M and Kardia, Sharon L R and Absher, Devin M and Binder, Elisabeth B and Singleton, Andrew B and Bandinelli, Stefania and Peters, Annette and Waldenberger, Melanie and Matullo, Giuseppe and Schwartz, Joel D and Demerath, Ellen W and Uitterlinden, Andr{\'e} G and van Meurs, Joyce B J and Franco, Oscar H and Chen, Yii-Der Ida and Levy, Daniel and Turner, Stephen T and Deary, Ian J and Ressler, Kerry J and Dupuis, Jos{\'e}e and Ferrucci, Luigi and Ong, Ken K and Assimes, Themistocles L and Boerwinkle, Eric and Koenig, Wolfgang and Arnett, Donna K and Baccarelli, Andrea A and Benjamin, Emelia J and Dehghan, Abbas} } @article {7596, title = {Impact of common genetic determinants of Hemoglobin A1c on type 2 diabetes risk and diagnosis in ancestrally diverse populations: A transethnic genome-wide meta-analysis.}, journal = {PLoS Med}, volume = {14}, year = {2017}, month = {2017 Sep}, pages = {e1002383}, abstract = {

BACKGROUND: Glycated hemoglobin (HbA1c) is used to diagnose type 2 diabetes (T2D) and assess glycemic control in patients with diabetes. Previous genome-wide association studies (GWAS) have identified 18 HbA1c-associated genetic variants. These variants proved to be classifiable by their likely biological action as erythrocytic (also associated with erythrocyte traits) or glycemic (associated with other glucose-related traits). In this study, we tested the hypotheses that, in a very large scale GWAS, we would identify more genetic variants associated with HbA1c and that HbA1c variants implicated in erythrocytic biology would affect the diagnostic accuracy of HbA1c. We therefore expanded the number of HbA1c-associated loci and tested the effect of genetic risk-scores comprised of erythrocytic or glycemic variants on incident diabetes prediction and on prevalent diabetes screening performance. Throughout this multiancestry study, we kept a focus on interancestry differences in HbA1c genetics performance that might influence race-ancestry differences in health outcomes.

METHODS \& FINDINGS: Using genome-wide association meta-analyses in up to 159,940 individuals from 82 cohorts of European, African, East Asian, and South Asian ancestry, we identified 60 common genetic variants associated with HbA1c. We classified variants as implicated in glycemic, erythrocytic, or unclassified biology and tested whether additive genetic scores of erythrocytic variants (GS-E) or glycemic variants (GS-G) were associated with higher T2D incidence in multiethnic longitudinal cohorts (N = 33,241). Nineteen glycemic and 22 erythrocytic variants were associated with HbA1c at genome-wide significance. GS-G was associated with higher T2D risk (incidence OR = 1.05, 95\% CI 1.04-1.06, per HbA1c-raising allele, p = 3 {\texttimes} 10-29); whereas GS-E was not (OR = 1.00, 95\% CI 0.99-1.01, p = 0.60). In Europeans and Asians, erythrocytic variants in aggregate had only modest effects on the diagnostic accuracy of HbA1c. Yet, in African Americans, the X-linked G6PD G202A variant (T-allele frequency 11\%) was associated with an absolute decrease in HbA1c of 0.81\%-units (95\% CI 0.66-0.96) per allele in hemizygous men, and 0.68\%-units (95\% CI 0.38-0.97) in homozygous women. The G6PD variant may cause approximately 2\% (N = 0.65 million, 95\% CI 0.55-0.74) of African American adults with T2D to remain undiagnosed when screened with HbA1c. Limitations include the smaller sample sizes for non-European ancestries and the inability to classify approximately one-third of the variants. Further studies in large multiethnic cohorts with HbA1c, glycemic, and erythrocytic traits are required to better determine the biological action of the unclassified variants.

CONCLUSIONS: As G6PD deficiency can be clinically silent until illness strikes, we recommend investigation of the possible benefits of screening for the G6PD genotype along with using HbA1c to diagnose T2D in populations of African ancestry or groups where G6PD deficiency is common. Screening with direct glucose measurements, or genetically-informed HbA1c diagnostic thresholds in people with G6PD deficiency, may be required to avoid missed or delayed diagnoses.

}, keywords = {Diabetes Mellitus, Type 2, Genetic Variation, Genome-Wide Association Study, Glycated Hemoglobin A, Humans, Phenotype, Risk}, issn = {1549-1676}, doi = {10.1371/journal.pmed.1002383}, author = {Wheeler, Eleanor and Leong, Aaron and Liu, Ching-Ti and Hivert, Marie-France and Strawbridge, Rona J and Podmore, Clara and Li, Man and Yao, Jie and Sim, Xueling and Hong, Jaeyoung and Chu, Audrey Y and Zhang, Weihua and Wang, Xu and Chen, Peng and Maruthur, Nisa M and Porneala, Bianca C and Sharp, Stephen J and Jia, Yucheng and Kabagambe, Edmond K and Chang, Li-Ching and Chen, Wei-Min and Elks, Cathy E and Evans, Daniel S and Fan, Qiao and Giulianini, Franco and Go, Min Jin and Hottenga, Jouke-Jan and Hu, Yao and Jackson, Anne U and Kanoni, Stavroula and Kim, Young Jin and Kleber, Marcus E and Ladenvall, Claes and Lecoeur, C{\'e}cile and Lim, Sing-Hui and Lu, Yingchang and Mahajan, Anubha and Marzi, Carola and Nalls, Mike A and Navarro, Pau and Nolte, Ilja M and Rose, Lynda M and Rybin, Denis V and Sanna, Serena and Shi, Yuan and Stram, Daniel O and Takeuchi, Fumihiko and Tan, Shu Pei and van der Most, Peter J and van Vliet-Ostaptchouk, Jana V and Wong, Andrew and Yengo, Loic and Zhao, Wanting and Goel, Anuj and Martinez Larrad, Maria Teresa and Radke, D{\"o}rte and Salo, Perttu and Tanaka, Toshiko and van Iperen, Erik P A and Abecasis, Goncalo and Afaq, Saima and Alizadeh, Behrooz Z and Bertoni, Alain G and Bonnefond, Am{\'e}lie and B{\"o}ttcher, Yvonne and Bottinger, Erwin P and Campbell, Harry and Carlson, Olga D and Chen, Chien-Hsiun and Cho, Yoon Shin and Garvey, W Timothy and Gieger, Christian and Goodarzi, Mark O and Grallert, Harald and Hamsten, Anders and Hartman, Catharina A and Herder, Christian and Hsiung, Chao Agnes and Huang, Jie and Igase, Michiya and Isono, Masato and Katsuya, Tomohiro and Khor, Chiea-Chuen and Kiess, Wieland and Kohara, Katsuhiko and Kovacs, Peter and Lee, Juyoung and Lee, Wen-Jane and Lehne, Benjamin and Li, Huaixing and Liu, Jianjun and Lobbens, Stephane and Luan, Jian{\textquoteright}an and Lyssenko, Valeriya and Meitinger, Thomas and Miki, Tetsuro and Miljkovic, Iva and Moon, Sanghoon and Mulas, Antonella and M{\"u}ller, Gabriele and M{\"u}ller-Nurasyid, Martina and Nagaraja, Ramaiah and Nauck, Matthias and Pankow, James S and Polasek, Ozren and Prokopenko, Inga and Ramos, Paula S and Rasmussen-Torvik, Laura and Rathmann, Wolfgang and Rich, Stephen S and Robertson, Neil R and Roden, Michael and Roussel, Ronan and Rudan, Igor and Scott, Robert A and Scott, William R and Sennblad, Bengt and Siscovick, David S and Strauch, Konstantin and Sun, Liang and Swertz, Morris and Tajuddin, Salman M and Taylor, Kent D and Teo, Yik-Ying and Tham, Yih Chung and T{\"o}njes, Anke and Wareham, Nicholas J and Willemsen, Gonneke and Wilsgaard, Tom and Hingorani, Aroon D and Egan, Josephine and Ferrucci, Luigi and Hovingh, G Kees and Jula, Antti and Kivimaki, Mika and Kumari, Meena and Nj{\o}lstad, Inger and Palmer, Colin N A and Serrano R{\'\i}os, Manuel and Stumvoll, Michael and Watkins, Hugh and Aung, Tin and Bl{\"u}her, Matthias and Boehnke, Michael and Boomsma, Dorret I and Bornstein, Stefan R and Chambers, John C and Chasman, Daniel I and Chen, Yii-Der Ida and Chen, Yduan-Tsong and Cheng, Ching-Yu and Cucca, Francesco and de Geus, Eco J C and Deloukas, Panos and Evans, Michele K and Fornage, Myriam and Friedlander, Yechiel and Froguel, Philippe and Groop, Leif and Gross, Myron D and Harris, Tamara B and Hayward, Caroline and Heng, Chew-Kiat and Ingelsson, Erik and Kato, Norihiro and Kim, Bong-Jo and Koh, Woon-Puay and Kooner, Jaspal S and K{\"o}rner, Antje and Kuh, Diana and Kuusisto, Johanna and Laakso, Markku and Lin, Xu and Liu, Yongmei and Loos, Ruth J F and Magnusson, Patrik K E and M{\"a}rz, Winfried and McCarthy, Mark I and Oldehinkel, Albertine J and Ong, Ken K and Pedersen, Nancy L and Pereira, Mark A and Peters, Annette and Ridker, Paul M and Sabanayagam, Charumathi and Sale, Michele and Saleheen, Danish and Saltevo, Juha and Schwarz, Peter Eh and Sheu, Wayne H H and Snieder, Harold and Spector, Timothy D and Tabara, Yasuharu and Tuomilehto, Jaakko and van Dam, Rob M and Wilson, James G and Wilson, James F and Wolffenbuttel, Bruce H R and Wong, Tien Yin and Wu, Jer-Yuarn and Yuan, Jian-Min and Zonderman, Alan B and Soranzo, Nicole and Guo, Xiuqing and Roberts, David J and Florez, Jose C and Sladek, Robert and Dupuis, Jos{\'e}e and Morris, Andrew P and Tai, E-Shyong and Selvin, Elizabeth and Rotter, Jerome I and Langenberg, Claudia and Barroso, In{\^e}s and Meigs, James B} } @article {7920, title = {Genome Analyses of >200,000 Individuals Identify 58 Loci for Chronic Inflammation and Highlight Pathways that Link Inflammation and Complex Disorders.}, journal = {Am J Hum Genet}, volume = {103}, year = {2018}, month = {2018 Nov 01}, pages = {691-706}, abstract = {

C-reactive protein (CRP) is a sensitive biomarker of chronic low-grade inflammation and is associated with multiple complex diseases. The genetic determinants of chronic inflammation remain largely unknown, and the causal role of CRP in several clinical outcomes is debated. We performed two genome-wide association studies (GWASs), on HapMap and 1000 Genomes imputed data, of circulating amounts of CRP by using data from 88 studies comprising 204,402 European individuals. Additionally, we performed in silico functional analyses and Mendelian randomization analyses with several clinical outcomes. The GWAS meta-analyses of CRP revealed 58 distinct genetic loci (p < 5~{\texttimes} 10). After adjustment for body mass index in the regression analysis, the associations at all except three loci remained. The lead variants at the distinct loci explained up to 7.0\% of the variance in circulating amounts of CRP. We identified 66 gene sets that were organized in two substantially correlated clusters, one mainly composed of immune pathways and the other characterized by metabolic pathways in the liver. Mendelian randomization analyses revealed a causal protective effect of CRP on schizophrenia and a risk-increasing effect on bipolar disorder. Our findings provide further insights into the biology of inflammation and could lead to interventions for treating inflammation and its clinical consequences.

}, issn = {1537-6605}, doi = {10.1016/j.ajhg.2018.09.009}, author = {Ligthart, Symen and Vaez, Ahmad and V{\~o}sa, Urmo and Stathopoulou, Maria G and de Vries, Paul S and Prins, Bram P and van der Most, Peter J and Tanaka, Toshiko and Naderi, Elnaz and Rose, Lynda M and Wu, Ying and Karlsson, Robert and Barbalic, Maja and Lin, Honghuang and Pool, Rene and Zhu, Gu and Mace, Aurelien and Sidore, Carlo and Trompet, Stella and Mangino, Massimo and Sabater-Lleal, Maria and Kemp, John P and Abbasi, Ali and Kacprowski, Tim and Verweij, Niek and Smith, Albert V and Huang, Tao and Marzi, Carola and Feitosa, Mary F and Lohman, Kurt K and Kleber, Marcus E and Milaneschi, Yuri and Mueller, Christian and Huq, Mahmudul and Vlachopoulou, Efthymia and Lyytik{\"a}inen, Leo-Pekka and Oldmeadow, Christopher and Deelen, Joris and Perola, Markus and Zhao, Jing Hua and Feenstra, Bjarke and Amini, Marzyeh and Lahti, Jari and Schraut, Katharina E and Fornage, Myriam and Suktitipat, Bhoom and Chen, Wei-Min and Li, Xiaohui and Nutile, Teresa and Malerba, Giovanni and Luan, Jian{\textquoteright}an and Bak, Tom and Schork, Nicholas and del Greco M, Fabiola and Thiering, Elisabeth and Mahajan, Anubha and Marioni, Riccardo E and Mihailov, Evelin and Eriksson, Joel and Ozel, Ayse Bilge and Zhang, Weihua and Nethander, Maria and Cheng, Yu-Ching and Aslibekyan, Stella and Ang, Wei and Gandin, Ilaria and Yengo, Loic and Portas, Laura and Kooperberg, Charles and Hofer, Edith and Rajan, Kumar B and Schurmann, Claudia and den Hollander, Wouter and Ahluwalia, Tarunveer S and Zhao, Jing and Draisma, Harmen H M and Ford, Ian and Timpson, Nicholas and Teumer, Alexander and Huang, Hongyan and Wahl, Simone and Liu, Yongmei and Huang, Jie and Uh, Hae-Won and Geller, Frank and Joshi, Peter K and Yanek, Lisa R and Trabetti, Elisabetta and Lehne, Benjamin and Vozzi, Diego and Verbanck, Marie and Biino, Ginevra and Saba, Yasaman and Meulenbelt, Ingrid and O{\textquoteright}Connell, Jeff R and Laakso, Markku and Giulianini, Franco and Magnusson, Patrik K E and Ballantyne, Christie M and Hottenga, Jouke Jan and Montgomery, Grant W and Rivadineira, Fernando and Rueedi, Rico and Steri, Maristella and Herzig, Karl-Heinz and Stott, David J and Menni, Cristina and Fr{\r a}nberg, Mattias and St Pourcain, Beate and Felix, Stephan B and Pers, Tune H and Bakker, Stephan J L and Kraft, Peter and Peters, Annette and Vaidya, Dhananjay and Delgado, Graciela and Smit, Johannes H and Gro{\ss}mann, Vera and Sinisalo, Juha and Sepp{\"a}l{\"a}, Ilkka and Williams, Stephen R and Holliday, Elizabeth G and Moed, Matthijs and Langenberg, Claudia and R{\"a}ikk{\"o}nen, Katri and Ding, Jingzhong and Campbell, Harry and Sale, Mich{\`e}le M and Chen, Yii-der I and James, Alan L and Ruggiero, Daniela and Soranzo, Nicole and Hartman, Catharina A and Smith, Erin N and Berenson, Gerald S and Fuchsberger, Christian and Hernandez, Dena and Tiesler, Carla M T and Giedraitis, Vilmantas and Liewald, David and Fischer, Krista and Mellstr{\"o}m, Dan and Larsson, Anders and Wang, Yunmei and Scott, William R and Lorentzon, Matthias and Beilby, John and Ryan, Kathleen A and Pennell, Craig E and Vuckovic, Dragana and Balkau, Beverly and Concas, Maria Pina and Schmidt, Reinhold and Mendes de Leon, Carlos F and Bottinger, Erwin P and Kloppenburg, Margreet and Paternoster, Lavinia and Boehnke, Michael and Musk, A W and Willemsen, Gonneke and Evans, David M and Madden, Pamela A F and K{\"a}h{\"o}nen, Mika and Kutalik, Zolt{\'a}n and Zoledziewska, Magdalena and Karhunen, Ville and Kritchevsky, Stephen B and Sattar, Naveed and Lachance, Genevieve and Clarke, Robert and Harris, Tamara B and Raitakari, Olli T and Attia, John R and van Heemst, Diana and Kajantie, Eero and Sorice, Rossella and Gambaro, Giovanni and Scott, Robert A and Hicks, Andrew A and Ferrucci, Luigi and Standl, Marie and Lindgren, Cecilia M and Starr, John M and Karlsson, Magnus and Lind, Lars and Li, Jun Z and Chambers, John C and Mori, Trevor A and de Geus, Eco J C N and Heath, Andrew C and Martin, Nicholas G and Auvinen, Juha and Buckley, Brendan M and de Craen, Anton J M and Waldenberger, Melanie and Strauch, Konstantin and Meitinger, Thomas and Scott, Rodney J and McEvoy, Mark and Beekman, Marian and Bombieri, Cristina and Ridker, Paul M and Mohlke, Karen L and Pedersen, Nancy L and Morrison, Alanna C and Boomsma, Dorret I and Whitfield, John B and Strachan, David P and Hofman, Albert and Vollenweider, Peter and Cucca, Francesco and Jarvelin, Marjo-Riitta and Jukema, J Wouter and Spector, Tim D and Hamsten, Anders and Zeller, Tanja and Uitterlinden, Andr{\'e} G and Nauck, Matthias and Gudnason, Vilmundur and Qi, Lu and Grallert, Harald and Borecki, Ingrid B and Rotter, Jerome I and M{\"a}rz, Winfried and Wild, Philipp S and Lokki, Marja-Liisa and Boyle, Michael and Salomaa, Veikko and Melbye, Mads and Eriksson, Johan G and Wilson, James F and Penninx, Brenda W J H and Becker, Diane M and Worrall, Bradford B and Gibson, Greg and Krauss, Ronald M and Ciullo, Marina and Zaza, Gianluigi and Wareham, Nicholas J and Oldehinkel, Albertine J and Palmer, Lyle J and Murray, Sarah S and Pramstaller, Peter P and Bandinelli, Stefania and Heinrich, Joachim and Ingelsson, Erik and Deary, Ian J and M{\"a}gi, Reedik and Vandenput, Liesbeth and van der Harst, Pim and Desch, Karl C and Kooner, Jaspal S and Ohlsson, Claes and Hayward, Caroline and Lehtim{\"a}ki, Terho and Shuldiner, Alan R and Arnett, Donna K and Beilin, Lawrence J and Robino, Antonietta and Froguel, Philippe and Pirastu, Mario and Jess, Tine and Koenig, Wolfgang and Loos, Ruth J F and Evans, Denis A and Schmidt, Helena and Smith, George Davey and Slagboom, P Eline and Eiriksdottir, Gudny and Morris, Andrew P and Psaty, Bruce M and Tracy, Russell P and Nolte, Ilja M and Boerwinkle, Eric and Visvikis-Siest, Sophie and Reiner, Alex P and Gross, Myron and Bis, Joshua C and Franke, Lude and Franco, Oscar H and Benjamin, Emelia J and Chasman, Daniel I and Dupuis, Jos{\'e}e and Snieder, Harold and Dehghan, Abbas and Alizadeh, Behrooz Z} }