@article {10514, title = {Enrichment of low-frequency functional variants revealed by whole-genome sequencing of multiple isolated European populations.}, journal = {Nat Commun}, volume = {8}, year = {2017}, month = {2017 06 23}, pages = {15927}, abstract = {

The genetic features of isolated populations can boost power in complex-trait association studies, and an in-depth understanding of how their genetic variation has been shaped by their demographic history can help leverage these advantageous characteristics. Here, we perform a comprehensive investigation using 3,059 newly generated low-depth whole-genome sequences from eight European isolates and two matched general populations, together with published data from the 1000 Genomes Project and UK10K. Sequencing data give deeper and richer insights into population demography and genetic characteristics than genotype-chip data, distinguishing related populations more effectively and allowing their functional variants to be studied more fully. We demonstrate relaxation of purifying selection in the isolates, leading to enrichment of rare and low-frequency functional variants, using novel statistics, DVxy and SVxy. We also develop an isolation-index (Isx) that predicts the overall level of such key genetic characteristics and can thus help guide population choice in future complex-trait association studies.

}, keywords = {European Continental Ancestry Group, Gene Frequency, Genetic Variation, Genetics, Population, Genome, Human, Humans, Polymorphism, Single Nucleotide, Whole Genome Sequencing}, issn = {2041-1723}, doi = {10.1038/ncomms15927}, author = {Xue, Yali and Mezzavilla, Massimo and Haber, Marc and McCarthy, Shane and Chen, Yuan and Narasimhan, Vagheesh and Gilly, Arthur and Ayub, Qasim and Colonna, Vincenza and Southam, Lorraine and Finan, Christopher and Massaia, Andrea and Chheda, Himanshu and Palta, Priit and Ritchie, Graham and Asimit, Jennifer and Dedoussis, George and Gasparini, Paolo and Palotie, Aarno and Ripatti, Samuli and Soranzo, Nicole and Toniolo, Daniela and Wilson, James F and Durbin, Richard and Tyler-Smith, Chris and Zeggini, Eleftheria} } @article {10557, title = {Whole-Genome Sequencing Coupled to Imputation Discovers Genetic Signals for Anthropometric Traits.}, journal = {Am J Hum Genet}, volume = {100}, year = {2017}, month = {2017 Jun 01}, pages = {865-884}, abstract = {

Deep sequence-based imputation can enhance the discovery power of genome-wide association studies by assessing previously unexplored variation across the common- and low-frequency spectra. We applied a hybrid whole-genome sequencing (WGS) and deep imputation approach to examine the broader allelic architecture of 12 anthropometric traits associated with height, body mass, and fat distribution in up to 267,616 individuals. We report 106 genome-wide significant signals that have not been previously identified, including 9 low-frequency variants pointing to functional candidates. Of the 106 signals, 6 are in genomic regions that have not been implicated with related traits before, 28 are independent signals at previously reported regions, and 72 represent previously reported signals for a different anthropometric trait. 71\% of signals reside within genes and fine mapping resolves 23 signals to one or two likely causal variants. We confirm genetic overlap between human monogenic and polygenic anthropometric traits and find signal enrichment in cis expression QTLs in relevant tissues. Our results highlight the potential of WGS strategies to enhance biologically relevant discoveries across the frequency spectrum.

}, keywords = {Anthropometry, Body Height, Cohort Studies, Databases, Genetic, DNA Methylation, Female, Genetic Variation, Genome, Human, Genome-Wide Association Study, Humans, Lipodystrophy, Male, Meta-Analysis as Topic, Obesity, Physical Chromosome Mapping, Quantitative Trait Loci, Sequence Analysis, DNA, Sex Characteristics, Syndrome, United Kingdom}, issn = {1537-6605}, doi = {10.1016/j.ajhg.2017.04.014}, author = {Tachmazidou, Ioanna and S{\"u}veges, D{\'a}niel and Min, Josine L and Ritchie, Graham R S and Steinberg, Julia and Walter, Klaudia and Iotchkova, Valentina and Schwartzentruber, Jeremy and Huang, Jie and Memari, Yasin and McCarthy, Shane and Crawford, Andrew A and Bombieri, Cristina and Cocca, Massimiliano and Farmaki, Aliki-Eleni and Gaunt, Tom R and Jousilahti, Pekka and Kooijman, Marjolein N and Lehne, Benjamin and Malerba, Giovanni and M{\"a}nnist{\"o}, Satu and Matchan, Angela and Medina-Gomez, Carolina and Metrustry, Sarah J and Nag, Abhishek and Ntalla, Ioanna and Paternoster, Lavinia and Rayner, Nigel W and Sala, Cinzia and Scott, William R and Shihab, Hashem A and Southam, Lorraine and St Pourcain, Beate and Traglia, Michela and Trajanoska, Katerina and Zaza, Gialuigi and Zhang, Weihua and Artigas, Mar{\'\i}a S and Bansal, Narinder and Benn, Marianne and Chen, Zhongsheng and Danecek, Petr and Lin, Wei-Yu and Locke, Adam and Luan, Jian{\textquoteright}an and Manning, Alisa K and Mulas, Antonella and Sidore, Carlo and Tybjaerg-Hansen, Anne and Varbo, Anette and Zoledziewska, Magdalena and Finan, Chris and Hatzikotoulas, Konstantinos and Hendricks, Audrey E and Kemp, John P and Moayyeri, Alireza and Panoutsopoulou, Kalliope and Szpak, Michal and Wilson, Scott G and Boehnke, Michael and Cucca, Francesco and Di Angelantonio, Emanuele and Langenberg, Claudia and Lindgren, Cecilia and McCarthy, Mark I and Morris, Andrew P and Nordestgaard, B{\o}rge G and Scott, Robert A and Tobin, Martin D and Wareham, Nicholas J and Burton, Paul and Chambers, John C and Smith, George Davey and Dedoussis, George and Felix, Janine F and Franco, Oscar H and Gambaro, Giovanni and Gasparini, Paolo and Hammond, Christopher J and Hofman, Albert and Jaddoe, Vincent W V and Kleber, Marcus and Kooner, Jaspal S and Perola, Markus and Relton, Caroline and Ring, Susan M and Rivadeneira, Fernando and Salomaa, Veikko and Spector, Timothy D and Stegle, Oliver and Toniolo, Daniela and Uitterlinden, Andr{\'e} G and Barroso, In{\^e}s and Greenwood, Celia M T and Perry, John R B and Walker, Brian R and Butterworth, Adam S and Xue, Yali and Durbin, Richard and Small, Kerrin S and Soranzo, Nicole and Timpson, Nicholas J and Zeggini, Eleftheria} } @article {8069, title = {Genetic evidence for an origin of the Armenians from Bronze Age mixing of multiple populations.}, journal = {Eur J Hum Genet}, year = {2015}, month = {2015 Oct 21}, abstract = {

The Armenians are a culturally isolated population who historically inhabited a region in the Near East bounded by the Mediterranean and Black seas and the Caucasus, but remain under-represented in genetic studies and have a complex history including a major geographic displacement during World War I. Here, we analyse genome-wide variation in 173 Armenians and compare them with 78 other worldwide populations. We find that Armenians form a distinctive cluster linking the Near East, Europe, and the Caucasus. We show that Armenian diversity can be explained by several mixtures of Eurasian populations that occurred between ~3000 and ~2000 bce, a period characterized by major population migrations after the domestication of the horse, appearance of chariots, and the rise of advanced civilizations in the Near East. However, genetic signals of population mixture cease after ~1200 bce when Bronze Age civilizations in the Eastern Mediterranean world suddenly and violently collapsed. Armenians have since remained isolated and genetic structure within the population developed ~500 years ago when Armenia was divided between the Ottomans and the Safavid Empire in Iran. Finally, we show that Armenians have higher genetic affinity to Neolithic Europeans than other present-day Near Easterners, and that 29\% of Armenian ancestry may originate from an ancestral population that is best represented by Neolithic Europeans.European Journal of Human Genetics advance online publication, 21 October 2015; doi:10.1038/ejhg.2015.206.

}, issn = {1476-5438}, doi = {10.1038/ejhg.2015.206}, author = {Haber, Marc and Mezzavilla, Massimo and Xue, Yali and Comas, David and Gasparini, Paolo and Zalloua, Pierre and Tyler-Smith, Chris} }