@article {7005, title = {Association of the IGF1 gene with fasting insulin levels.}, journal = {Eur J Hum Genet}, volume = {24}, year = {2016}, month = {2016 Aug}, pages = {1337-43}, abstract = {

Insulin-like growth factor 1 (IGF-I) has been associated with insulin resistance. Genome-wide association studies (GWASs) of fasting insulin (FI) identified single-nucleotide variants (SNVs) near the IGF1 gene, raising two hypotheses: (1) these associations are mediated by IGF-I levels and (2) these noncoding variants either tag other functional variants in the region or are directly functional. In our study, analyses including 5141 individuals from population-based cohorts suggest that FI associations near IGF1 are not mediated by IGF-I. Analyses of targeted sequencing data in 3539 individuals reveal a large number of novel rare variants at the IGF1 locus and show a FI association with a subset of rare nonsynonymous variants (PSKAT=5.7 {\texttimes} 10(-4)). Conditional analyses suggest that this association is partly explained by the GWAS signal and the presence of a residual independent rare variant effect (Pconditional=0.019). Annotation using ENCODE data suggests that the GWAS variants may have a direct functional role in insulin biology. In conclusion, our study provides insight into variation present at the IGF1 locus and into the genetic architecture underlying FI levels, suggesting that FI associations of SNVs near IGF1 are not mediated by IGF-I and suggesting a role for both rare nonsynonymous and common functional variants in insulin biology.

}, issn = {1476-5438}, doi = {10.1038/ejhg.2016.4}, author = {Willems, Sara M and Cornes, Belinda K and Brody, Jennifer A and Morrison, Alanna C and Lipovich, Leonard and Dauriz, Marco and Chen, Yuning and Liu, Ching-Ti and Rybin, Denis V and Gibbs, Richard A and Muzny, Donna and Pankow, James S and Psaty, Bruce M and Boerwinkle, Eric and Rotter, Jerome I and Siscovick, David S and Vasan, Ramachandran S and Kaplan, Robert C and Isaacs, Aaron and Dupuis, Jos{\'e}e and van Duijn, Cornelia M and Meigs, James B} } @article {7141, title = {Trans-ethnic Meta-analysis and Functional Annotation Illuminates the~Genetic Architecture of Fasting Glucose and Insulin.}, journal = {Am J Hum Genet}, volume = {99}, year = {2016}, month = {2016 Jul 7}, pages = {56-75}, abstract = {

Knowledge of the genetic basis of the type 2 diabetes (T2D)-related quantitative traits fasting glucose (FG) and insulin (FI) in African ancestry (AA) individuals has been limited. In non-diabetic subjects of AA (n = 20,209) and European ancestry (EA; n = 57,292), we performed trans-ethnic (AA+EA) fine-mapping of 54 established EA FG or FI loci with detailed functional annotation, assessed their relevance in AA individuals, and sought previously undescribed loci through trans-ethnic (AA+EA) meta-analysis. We narrowed credible sets of variants driving association signals for 22/54 EA-associated loci; 18/22 credible sets overlapped with active islet-specific enhancers or transcription factor (TF) binding sites, and 21/22 contained at least one TF motif. Of the 54 EA-associated loci, 23 were shared between EA and AA. Replication with an additional 10,096 AA individuals identified two previously undescribed FI loci, chrX FAM133A (rs213676) and chr5 PELO (rs6450057). Trans-ethnic analyses with regulatory annotation illuminate the genetic architecture of glycemic traits and suggest gene regulation as a target to advance precision medicine for T2D. Our approach to utilize state-of-the-art functional annotation and implement trans-ethnic association analysis for discovery and fine-mapping offers a framework for further follow-up and characterization of GWAS signals of complex trait loci.

}, issn = {1537-6605}, doi = {10.1016/j.ajhg.2016.05.006}, author = {Liu, Ching-Ti and Raghavan, Sridharan and Maruthur, Nisa and Kabagambe, Edmond Kato and Hong, Jaeyoung and Ng, Maggie C Y and Hivert, Marie-France and Lu, Yingchang and An, Ping and Bentley, Amy R and Drolet, Anne M and Gaulton, Kyle J and Guo, Xiuqing and Armstrong, Loren L and Irvin, Marguerite R and Li, Man and Lipovich, Leonard and Rybin, Denis V and Taylor, Kent D and Agyemang, Charles and Palmer, Nicholette D and Cade, Brian E and Chen, Wei-Min and Dauriz, Marco and Delaney, Joseph A C and Edwards, Todd L and Evans, Daniel S and Evans, Michele K and Lange, Leslie A and Leong, Aaron and Liu, Jingmin and Liu, Yongmei and Nayak, Uma and Patel, Sanjay R and Porneala, Bianca C and Rasmussen-Torvik, Laura J and Snijder, Marieke B and Stallings, Sarah C and Tanaka, Toshiko and Yanek, Lisa R and Zhao, Wei and Becker, Diane M and Bielak, Lawrence F and Biggs, Mary L and Bottinger, Erwin P and Bowden, Donald W and Chen, Guanjie and Correa, Adolfo and Couper, David J and Crawford, Dana C and Cushman, Mary and Eicher, John D and Fornage, Myriam and Franceschini, Nora and Fu, Yi-Ping and Goodarzi, Mark O and Gottesman, Omri and Hara, Kazuo and Harris, Tamara B and Jensen, Richard A and Johnson, Andrew D and Jhun, Min A and Karter, Andrew J and Keller, Margaux F and Kho, Abel N and Kizer, Jorge R and Krauss, Ronald M and Langefeld, Carl D and Li, Xiaohui and Liang, Jingling and Liu, Simin and Lowe, William L and Mosley, Thomas H and North, Kari E and Pacheco, Jennifer A and Peyser, Patricia A and Patrick, Alan L and Rice, Kenneth M and Selvin, Elizabeth and Sims, Mario and Smith, Jennifer A and Tajuddin, Salman M and Vaidya, Dhananjay and Wren, Mary P and Yao, Jie and Zhu, Xiaofeng and Ziegler, Julie T and Zmuda, Joseph M and Zonderman, Alan B and Zwinderman, Aeilko H and Adeyemo, Adebowale and Boerwinkle, Eric and Ferrucci, Luigi and Hayes, M Geoffrey and Kardia, Sharon L R and Miljkovic, Iva and Pankow, James S and Rotimi, Charles N and Sale, Mich{\`e}le M and Wagenknecht, Lynne E and Arnett, Donna K and Chen, Yii-Der Ida and Nalls, Michael A and Province, Michael A and Kao, W H Linda and Siscovick, David S and Psaty, Bruce M and Wilson, James G and Loos, Ruth J F and Dupuis, Jos{\'e}e and Rich, Stephen S and Florez, Jose C and Rotter, Jerome I and Morris, Andrew P and Meigs, James B} } @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 {7668, title = {Refining the accuracy of validated target identification through coding variant fine-mapping in type 2 diabetes.}, journal = {Nat Genet}, volume = {50}, year = {2018}, month = {2018 Apr}, pages = {559-571}, abstract = {

We aggregated coding variant data for 81,412 type 2 diabetes cases and 370,832 controls of diverse ancestry, identifying 40 coding variant association signals (P < 2.2 {\texttimes} 10); of these, 16 map outside known risk-associated loci. We make two important observations. First, only five of these signals are driven by low-frequency variants: even for these, effect sizes are modest (odds ratio <=1.29). Second, when we used large-scale genome-wide association data to fine-map the associated variants in their regional context, accounting for the global enrichment of complex trait associations in coding sequence, compelling evidence for coding variant causality was obtained for only 16 signals. At 13 others, the associated coding variants clearly represent {\textquoteright}false leads{\textquoteright} with potential to generate erroneous mechanistic inference. Coding variant associations offer a direct route to biological insight for complex diseases and identification of validated therapeutic targets; however, appropriate mechanistic inference requires careful specification of their causal contribution to disease predisposition.

}, issn = {1546-1718}, doi = {10.1038/s41588-018-0084-1}, author = {Mahajan, Anubha and Wessel, Jennifer and Willems, Sara M and Zhao, Wei and Robertson, Neil R and Chu, Audrey Y and Gan, Wei and Kitajima, Hidetoshi and Taliun, Daniel and Rayner, N William and Guo, Xiuqing and Lu, Yingchang and Li, Man and Jensen, Richard A and Hu, Yao and Huo, Shaofeng and Lohman, Kurt K and Zhang, Weihua and Cook, James P and Prins, Bram Peter and Flannick, Jason and Grarup, Niels and Trubetskoy, Vassily Vladimirovich and Kravic, Jasmina and Kim, Young Jin and Rybin, Denis V and Yaghootkar, Hanieh and M{\"u}ller-Nurasyid, Martina and Meidtner, Karina and Li-Gao, Ruifang and Varga, Tibor V and Marten, Jonathan and Li, Jin and Smith, Albert Vernon and An, Ping and Ligthart, Symen and Gustafsson, Stefan and Malerba, Giovanni and Demirkan, Ayse and Tajes, Juan Fernandez and Steinthorsdottir, Valgerdur and Wuttke, Matthias and Lecoeur, C{\'e}cile and Preuss, Michael and Bielak, Lawrence F and Graff, Marielisa and Highland, Heather M and Justice, Anne E and Liu, Dajiang J and Marouli, Eirini and Peloso, Gina Marie and Warren, Helen R and Afaq, Saima and Afzal, Shoaib and Ahlqvist, Emma and Almgren, Peter and Amin, Najaf and Bang, Lia B and Bertoni, Alain G and Bombieri, Cristina and Bork-Jensen, Jette and Brandslund, Ivan and Brody, Jennifer A and Burtt, Noel P and Canouil, Micka{\"e}l and Chen, Yii-Der Ida and Cho, Yoon Shin and Christensen, Cramer and Eastwood, Sophie V and Eckardt, Kai-Uwe and Fischer, Krista and Gambaro, Giovanni and Giedraitis, Vilmantas and Grove, Megan L and de Haan, Hugoline G and Hackinger, Sophie and Hai, Yang and Han, Sohee and Tybj{\ae}rg-Hansen, Anne and Hivert, Marie-France and Isomaa, Bo and J{\"a}ger, Susanne and J{\o}rgensen, Marit E and J{\o}rgensen, Torben and K{\"a}r{\"a}j{\"a}m{\"a}ki, AnneMari and Kim, Bong-Jo and Kim, Sung Soo and Koistinen, Heikki A and Kovacs, Peter and Kriebel, Jennifer and Kronenberg, Florian and L{\"a}ll, Kristi and Lange, Leslie A and Lee, Jung-Jin and Lehne, Benjamin and Li, Huaixing and Lin, Keng-Hung and Linneberg, Allan and Liu, Ching-Ti and Liu, Jun and Loh, Marie and M{\"a}gi, Reedik and Mamakou, Vasiliki and McKean-Cowdin, Roberta and Nadkarni, Girish and Neville, Matt and Nielsen, Sune F and Ntalla, Ioanna and Peyser, Patricia A and Rathmann, Wolfgang and Rice, Kenneth and Rich, Stephen S and Rode, Line and Rolandsson, Olov and Sch{\"o}nherr, Sebastian and Selvin, Elizabeth and Small, Kerrin S and Stan{\v c}{\'a}kov{\'a}, Alena and Surendran, Praveen and Taylor, Kent D and Teslovich, Tanya M and Thorand, Barbara and Thorleifsson, Gudmar and Tin, Adrienne and T{\"o}njes, Anke and Varbo, Anette and Witte, Daniel R and Wood, Andrew R and Yajnik, Pranav and Yao, Jie and Yengo, Loic and Young, Robin and Amouyel, Philippe and Boeing, Heiner and Boerwinkle, Eric and Bottinger, Erwin P and Chowdhury, Rajiv and Collins, Francis S and Dedoussis, George and Dehghan, Abbas and Deloukas, Panos and Ferrario, Marco M and Ferrieres, Jean and Florez, Jose C and Frossard, Philippe and Gudnason, Vilmundur and Harris, Tamara B and Heckbert, Susan R and Howson, Joanna M M and Ingelsson, Martin and Kathiresan, Sekar and Kee, Frank and Kuusisto, Johanna and Langenberg, Claudia and Launer, Lenore J and Lindgren, Cecilia M and M{\"a}nnist{\"o}, Satu and Meitinger, Thomas and Melander, Olle and Mohlke, Karen L and Moitry, Marie and Morris, Andrew D and Murray, Alison D and de Mutsert, Ren{\'e}e and Orho-Melander, Marju and Owen, Katharine R and Perola, Markus and Peters, Annette and Province, Michael A and Rasheed, Asif and Ridker, Paul M and Rivadineira, Fernando and Rosendaal, Frits R and Rosengren, Anders H and Salomaa, Veikko and Sheu, Wayne H-H and Sladek, Rob and Smith, Blair H and Strauch, Konstantin and Uitterlinden, Andr{\'e} G and Varma, Rohit and Willer, Cristen J and Bl{\"u}her, Matthias and Butterworth, Adam S and Chambers, John Campbell and Chasman, Daniel I and Danesh, John and van Duijn, Cornelia and Dupuis, Jos{\'e}e and Franco, Oscar H and Franks, Paul W and Froguel, Philippe and Grallert, Harald and Groop, Leif and Han, Bok-Ghee and Hansen, Torben and Hattersley, Andrew T and Hayward, Caroline and Ingelsson, Erik and Kardia, Sharon L R and Karpe, Fredrik and Kooner, Jaspal Singh and K{\"o}ttgen, Anna and Kuulasmaa, Kari and Laakso, Markku and Lin, Xu and Lind, Lars and Liu, Yongmei and Loos, Ruth J F and Marchini, Jonathan and Metspalu, Andres and Mook-Kanamori, Dennis and Nordestgaard, B{\o}rge G and Palmer, Colin N A and Pankow, James S and Pedersen, Oluf and Psaty, Bruce M and Rauramaa, Rainer and Sattar, Naveed and Schulze, Matthias B and Soranzo, Nicole and Spector, Timothy D and Stefansson, Kari and Stumvoll, Michael and Thorsteinsdottir, Unnur and Tuomi, Tiinamaija and Tuomilehto, Jaakko and Wareham, Nicholas J and Wilson, James G and Zeggini, Eleftheria and Scott, Robert A and Barroso, In{\^e}s and Frayling, Timothy M and Goodarzi, Mark O and Meigs, James B and Boehnke, Michael and Saleheen, Danish and Morris, Andrew P and Rotter, Jerome I and McCarthy, Mark I} }