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Genome wide association study

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https://www.readbyqxmd.com/read/27911095/epigenetic-alterations-in-blood-mirror-age-associated-dna-methylation-and-gene-expression-changes-in-human-liver
#1
Madhusudhan Bysani, Alexander Perfilyev, Vanessa D de Mello, Tina Rönn, Emma Nilsson, Jussi Pihlajamäki, Charlotte Ling
AIM: To study the impact of aging on DNA methylation and mRNA expression in human liver. EXPERIMENTAL PROCEDURES: We analysed genome-wide DNA methylation and gene expression in human liver samples using Illumina 450K and HumanHT12 expression BeadChip arrays. RESULTS: DNA methylation analysis of ∼455,000 CpG sites in human liver revealed that age was significantly associated with altered DNA methylation of 20,396 CpG sites. Comparison of liver methylation data with published methylation data in other tissues showed that vast majority of the age-associated significant CpG sites overlapped between liver and blood, whereas a smaller overlap was found between liver and pancreatic islets or adipose tissue, respectively...
December 2, 2016: Epigenomics
https://www.readbyqxmd.com/read/27910927/novel-chemoimmunotherapeutic-strategy-for-hepatocellular-carcinoma-based-on-a-genome-wide-association-study
#2
Kaku Goto, Dorcas A Annan, Tomoko Morita, Wenwen Li, Ryosuke Muroyama, Yasuo Matsubara, Sayaka Ito, Ryo Nakagawa, Yasushi Tanoue, Masahisa Jinushi, Naoya Kato
Pharmacotherapeutic options are limited for hepatocellular carcinoma (HCC). Recently, we identified the anti-tumor ligand MHC class I polypeptide-related sequence A (MICA) gene as a susceptibility gene for hepatitis C virus-induced HCC in a genome-wide association study (GWAS). To prove the concept of HCC immunotherapy based on the results of a GWAS, in the present study, we searched for drugs that could restore MICA expression. A screen of the FDA-approved drug library identified the anti-cancer agent vorinostat as the strongest hit, suggesting histone deacetylase inhibitors (HDACis) as potent candidates...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910897/genomic-variations-leading-to-alterations-in-cell-morphology-of-campylobacter-spp
#3
Diane Esson, Alison E Mather, Eoin Scanlan, Srishti Gupta, Stefan P W de Vries, David Bailey, Simon R Harris, Trevelyan J McKinley, Guillaume Méric, Sophia K Berry, Pietro Mastroeni, Samuel K Sheppard, Graham Christie, Nicholas R Thomson, Julian Parkhill, Duncan J Maskell, Andrew J Grant
Campylobacter jejuni, the most common cause of bacterial diarrhoeal disease, is normally helical. However, it can also adopt straight rod, elongated helical and coccoid forms. Studying how helical morphology is generated, and how it switches between its different forms, is an important objective for understanding this pathogen. Here, we aimed to determine the genetic factors involved in generating the helical shape of Campylobacter. A C. jejuni transposon (Tn) mutant library was screened for non-helical mutants with inconsistent results...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27909820/genomic-analysis-reveals-the-presence-of-a-class-d-beta-lactamase-with-broad-substrate-specificity-in-animal-bite-associated-capnocytophaga-species
#4
S Zangenah, A F Andersson, V Özenci, P Bergman
Capnocytophga canimorsus and Capnocytophga cynodegmi can be transmitted from cats and dogs to humans, and can cause a wide range of infections including wound infections, sepsis, or endocarditis. We and others recently discovered two new Capnocytophaga species, C. canis and C. stomatis, mainly associated with wound infections. The first-line treatment of animal bite related infections is penicillin, and in case of allergy, doxycycline and trimethoprim/sulfamethoxazole. However, there is a lack of antibiotic susceptibility patterns for animal bite associated Capnocytophaga species...
December 1, 2016: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/27909437/differentially-methylated-dna-regions-in-monozygotic-twin-pairs-discordant-for-rheumatoid-arthritis-an-epigenome-wide-study
#5
Anders J Svendsen, Kristina Gervin, Robert Lyle, Lene Christiansen, Kirsten Kyvik, Peter Junker, Christian Nielsen, Gunnar Houen, Qihua Tan
OBJECTIVES: In an explorative epigenome-wide association study (EWAS) to search for gene independent, differentially methylated DNA positions and regions (DMRs) associated with rheumatoid arthritis (RA) by studying monozygotic (MZ) twin pairs discordant for RA. METHODS: Genomic DNA was isolated from whole blood samples from 28 MZ twin pairs discordant for RA. DNA methylation was measured using the HumanMethylation450 BeadChips. Smoking, anti-cyclic citrullinated peptide antibodies, and immunosuppressive treatment were included as covariates...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27907911/genetic-variants-in-the-znf208-gene-are-associated-with-esophageal-cancer-in-a-chinese-han-population
#6
Huijie Wang, Jianzhong Yu, Yanling Guo, Zhengxing Zhang, Guoqi Liu, Jingjie Li, Xiyang Zhang, Tianbo Jin, Zhaoxia Wang
Previous studies showed an association between the ZNF208 gene and gastric cancer. In this study, we investigated the association between single nucleotide polymorphisms (SNPs) in ZNF208 and the risk of esophageal cancer in a Chinese Han population. We conducted a case-control study that included 386 cases and 495 controls. Five SNPs were selected from previous genome-wide association studies and genotyped using the Sequenom MassARRAY platform. Unconditional logistic regression was used to calculate odds ratios and 95% confidence intervals after adjustment for age and gender...
November 19, 2016: Oncotarget
https://www.readbyqxmd.com/read/27906711/polycystic-ovary-syndrome-in-adolescent-girls
#7
Natalie Hecht Baldauff, Selma Feldman Witchel
PURPOSE OF REVIEW: Polycystic ovary syndrome (PCOS) is a common heterogeneous disorder that appears to have its origins during the peripubertal years. The diagnostic conundrum is that the typical clinical features, irregular menses and acne, occur during normal female puberty. Understanding the physiologic origins and molecular basis of the dysregulated hypothalamic-pituitary-gonadal axis in PCOS is fundamental to interrupting the distinctive vicious cycle of hyperandrogenism and chronic anovulation...
November 30, 2016: Current Opinion in Endocrinology, Diabetes, and Obesity
https://www.readbyqxmd.com/read/27906046/chromatin-landscapes-and-genetic-risk-in-systemic-lupus
#8
Joyce S Hui-Yuen, Lisha Zhu, Lai Ping Wong, Kaiyu Jiang, Yanmin Chen, Tao Liu, James N Jarvis
BACKGROUND: Systemic lupus erythematosus (SLE) is a multi-system, complex disease in which the environment interacts with inherited genes to produce broad phenotypes with inter-individual variability. Of 46 single nucleotide polymorphisms (SNPs) shown to confer genetic risk for SLE in recent genome-wide association studies, 30 lie within noncoding regions of the human genome. We therefore sought to identify and describe the functional elements (aside from genes) located within these regions of interest...
December 1, 2016: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/27905878/genomic-prediction-using-preselected-dna-variants-from-a-gwas-with-whole-genome-sequence-data-in-holstein-friesian-cattle
#9
Roel F Veerkamp, Aniek C Bouwman, Chris Schrooten, Mario P L Calus
BACKGROUND: Whole-genome sequence data is expected to capture genetic variation more completely than common genotyping panels. Our objective was to compare the proportion of variance explained and the accuracy of genomic prediction by using imputed sequence data or preselected SNPs from a genome-wide association study (GWAS) with imputed whole-genome sequence data. METHODS: Phenotypes were available for 5503 Holstein-Friesian bulls. Genotypes were imputed up to whole-genome sequence (13,789,029 segregating DNA variants) by using run 4 of the 1000 bull genomes project...
December 1, 2016: Genetics, Selection, Evolution: GSE
https://www.readbyqxmd.com/read/27903959/genome-wide-haplotype-association-study-identify-the-fgfr2-gene-as-a-risk-gene-for-acute-myeloid-leukemia
#10
Hongchao Lv, Mingming Zhang, Zhenwei Shang, Jin Li, Shanshan Zhang, Duan Lian, Ruijie Zhang
Acute myeloid leukemia (AML) is a cancer of the myeloid line of blood cells, and generally considered to be caused by environment and genetic factors. In this study, we combined a genome-wide haplotype association study (GWHAS) and gene prioritization strategy to mine AML-related genetic affect factors and understand its pathogenesis. A total of 175 AML patients were downloaded from the public GEO database (GSE32462) and 218 matched Caucasian controls were from the HapMap Project. We first identified the linkage disequilibrium (LD) blocks and performed a GWHAS to scan AML-related haplotypes...
November 26, 2016: Oncotarget
https://www.readbyqxmd.com/read/27903934/large-differences-in-adiponectin-levels-have-no-clear-effect-on-multiple-sclerosis-risk-a-mendelian-randomization-study
#11
Julia Devorak, Lauren E Mokry, John A Morris, Vincenzo Forgetta, George Davey Smith, Stephen Sawcer, J Brent Richards
BACKGROUND: Mendelian randomization (MR) studies have demonstrated strong support for an association between genetically increased body mass index and risk of multiple sclerosis (MS). The adipokine adiponectin may be a potential mechanism linking body mass to risk of MS. OBJECTIVE: To evaluate whether genetically increased adiponectin levels influence risk of MS. METHODS: Using genome-wide significant single nucleotide polymorphisms (SNPs) for adiponectin, we undertook an MR study to estimate the effect of adiponectin on MS...
November 30, 2016: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/27903283/systematic-analysis-of-chromatin-interactions-at-disease-associated-loci-links-novel-candidate-genes-to-inflammatory-bowel-disease
#12
Claartje A Meddens, Magdalena Harakalova, Noortje A M van den Dungen, Hassan Foroughi Asl, Hemme J Hijma, Edwin P J G Cuppen, Johan L M Björkegren, Folkert W Asselbergs, Edward E S Nieuwenhuis, Michal Mokry
BACKGROUND: Genome-wide association studies (GWAS) have revealed many susceptibility loci for complex genetic diseases. For most loci, the causal genes have not been identified. Currently, the identification of candidate genes is predominantly based on genes that localize close to or within identified loci. We have recently shown that 92 of the 163 inflammatory bowel disease (IBD)-loci co-localize with non-coding DNA regulatory elements (DREs). Mutations in DREs can contribute to IBD pathogenesis through dysregulation of gene expression...
November 30, 2016: Genome Biology
https://www.readbyqxmd.com/read/27902806/orthology-guided-transcriptome-assembly-of-italian-ryegrass-and-meadow-fescue-for-single-nucleotide-polymorphism-discovery
#13
Štěpán Stočes, Tom Ruttink, Jan Bartoš, Bruno Studer, Steven Yates, Zbigniew Zwierzykowski, Michael Abrouk, Isabel Roldán-Ruiz, Tomasz Książczyk, Elodie Rey, Jaroslav Doležel, David Kopecký
Single-nucleotide polymorphisms (SNPs) represent natural DNA sequence variation. They can be used for various applications including the construction of high-density genetic maps, analysis of genetic variability, genome-wide association studies, and map-based cloning. Here we report on transcriptome sequencing in the two forage grasses, meadow fescue ( Huds.) and Italian ryegrass ( Lam.), and identification of various classes of SNPs. Using the Orthology Guided Assembly (OGA) strategy, we assembled and annotated a total of 18,952 and 19,036 transcripts for Italian ryegrass and meadow fescue, respectively...
November 2016: Plant Genome
https://www.readbyqxmd.com/read/27902805/genome-wide-association-mapping-reveals-novel-qtl-for-seedling-leaf-rust-resistance-in-a-worldwide-collection-of-winter-wheat
#14
Genqiao Li, Xiangyang Xu, Guihua Bai, Brett F Carver, Robert Hunger, J Michael Bonman, James Kolmer, Hongxu Dong
Leaf rust of wheat ( L.) is a major disease that causes significant yield losses worldwide. The short-lived nature of leaf rust resistance () genes necessitates a continuous search for novel sources of resistance. We performed a genome-wide association study (GWAS) on a panel of 1596 wheat accessions. The panel was evaluated for leaf rust reaction by testing with a bulk of Eriks. () isolates collected from multiple fields of Oklahoma in 2013 and two predominant races in the fields of Oklahoma in 2015. The panel was genotyped with a set of 5011 single-nucleotide polymorphism (SNP) markers...
November 2016: Plant Genome
https://www.readbyqxmd.com/read/27902796/target-amplicon-sequencing-for-genotyping-genome-wide-single-nucleotide-polymorphisms-identified-by-whole-genome-resequencing-in-peanut
#15
Kenta Shirasawa, Chikara Kuwata, Manabu Watanabe, Masanobu Fukami, Hideki Hirakawa, Sachiko Isobe
Genome-wide genotyping data regarding breeding materials are essential resources for improving breeding efficiency, especially in plants with complex genomes with a high degree of polyploidy. Several current breeding efforts in cultivated peanut ( L.), which has a tetraploid genome, are devoted to developing high oleic acid cultivars. Genetic maps for such breeding programs have been developed using simple-sequence repeat (SSR) markers, the use of which requires time-consuming electrophoretic analyses. Next-generation sequencing (NGS) technology can overcome this technical hurdle...
November 2016: Plant Genome
https://www.readbyqxmd.com/read/27902795/genome-wide-association-study-identifies-candidate-loci-underlying-agronomic-traits-in-a-middle-american-diversity-panel-of-common-bean
#16
Samira Mafi Moghaddam, Sujan Mamidi, Juan M Osorno, Rian Lee, Mark Brick, James Kelly, Phillip Miklas, Carlos Urrea, Qijian Song, Perry Cregan, Jane Grimwood, Jeremy Schmutz, Phillip E McClean
Common bean ( L.) breeding programs aim to improve both agronomic and seed characteristics traits. However, the genetic architecture of the many traits that affect common bean production are not completely understood. Genome-wide association studies (GWAS) provide an experimental approach to identify genomic regions where important candidate genes are located. A panel of 280 modern bean genotypes from race Mesoamerica, referred to as the Middle American Diversity Panel (MDP), were grown in four US locations, and a GWAS using >150,000 single-nucleotide polymorphisms (SNPs) (minor allele frequency [MAF] ≥ 5%) was conducted for six agronomic traits...
November 2016: Plant Genome
https://www.readbyqxmd.com/read/27902791/genome-wide-association-mapping-of-leaf-rust-response-in-a-durum-wheat-worldwide-germplasm-collection
#17
Meriem Aoun, Matthew Breiland, M Kathryn Turner, Alexander Loladze, Shiaoman Chao, Steven S Xu, Karim Ammar, James A Anderson, James A Kolmer, Maricelis Acevedo
Leaf rust (caused by Erikss. []) is increasingly impacting durum wheat ( L. var. ) production with the recent appearance of races with virulence to widely grown cultivars in many durum producing areas worldwide. A highly virulent race on durum wheat was recently detected in Kansas. This race may spread to the northern Great Plains, where most of the US durum wheat is produced. The objective of this study was to identify sources of resistance to several races from the United States and Mexico at seedling stage in the greenhouse and at adult stage in field experiments...
November 2016: Plant Genome
https://www.readbyqxmd.com/read/27902780/co-regulation-of-iron-metabolism-and-virulence-associated-functions-by-iron-and-xibr-a-novel-iron-binding-transcription-factor-in-the-plant-pathogen-xanthomonas
#18
Sheo Shankar Pandey, Pradeep Kumar Patnana, Santosh Kumar Lomada, Archana Tomar, Subhadeep Chatterjee
Abilities of bacterial pathogens to adapt to the iron limitation present in hosts is critical to their virulence. Bacterial pathogens have evolved diverse strategies to coordinately regulate iron metabolism and virulence associated functions to maintain iron homeostasis in response to changing iron availability in the environment. In many bacteria the ferric uptake regulator (Fur) functions as transcription factor that utilize ferrous form of iron as cofactor to regulate transcription of iron metabolism and many cellular functions...
November 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27902482/il-23r-mutation-is-associated-with-ulcerative-colitis-a-systemic-review-and-meta-analysis
#19
Ling-Long Peng, Ying Wang, Feng-Ling Zhu, Wang-Dong Xu, Xue-Lei Ji, Jing Ni
OBJECTIVES: Since a genome-wide association study revealed that Interleukin-23 receptor (IL-23R) gene is a candidate gene for Ulcerative Colitis (UC), many studies have investigated the association between the IL-23R polymorphisms and UC. However, the results were controversial. The aim of the study was to determine whether the IL-23R polymorphisms confer susceptibility to UC. METHODS: A systematic literature search was carried out to identify all potentially relevant studies...
November 25, 2016: Oncotarget
https://www.readbyqxmd.com/read/27902416/the-xylella-fastidiosa-codiro-strain-associated-with-the-olive-quick-decline-syndrome-in-southern-italy-belongs-to-a-clonal-complex-of-the-subspecies-pauca-that-evolved-in-central-america
#20
Marco Scortichini, Simone Marcelletti
Xylella fastidiosa, a xylem-limited bacterium transmitted by xylem-fluid feeding Hemiptera insects, causes economic losses of both woody and herbaceous plant species. A X. fastidiosa subsp. pauca strain, namely CoDiRO, was recently found to be associated with the "olive quick decline syndrome" in southern Italy (i.e., Apulia region). Recently, some X. fastidiosa strains intercepted in France from Coffea spp. plant cuttings imported from Central and South America were characterized. The introduction of infected plant material from Central America in Apulia was also postulated even though an ad hoc study to confirm this hypothesis is lacking...
November 2, 2016: Microbiology
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