51
|
Genome-wide analysis of health-related biomarkers in the UK Household Longitudinal Study reveals novel associations. Sci Rep 2017; 7:11008. [PMID: 28887542 PMCID: PMC5591265 DOI: 10.1038/s41598-017-10812-1] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 08/08/2017] [Indexed: 11/24/2022] Open
Abstract
Serum biomarker levels are associated with the risk of complex diseases. Here, we aimed to gain insights into the genetic architecture of biomarker traits which can reflect health status. We performed genome-wide association analyses for twenty serum biomarkers involved in organ function and reproductive health. 9,961 individuals from the UK Household Longitudinal Study were genotyped using the Illumina HumanCoreExome array and variants imputed to the 1000 Genomes Project and UK10K haplotypes. We establish a polygenic heritability for all biomarkers, confirm associations of fifty-four established loci, and identify five novel, replicating associations at genome-wide significance. A low-frequency variant, rs28929474, (beta = 0.04, P = 2 × 10−10) was associated with levels of alanine transaminase, an indicator of liver damage. The variant is located in the gene encoding serine protease inhibitor, low levels of which are associated with alpha-1 antitrypsin deficiency which leads to liver disease. We identified novel associations (rs78900934, beta = 0.05, P = 6 × 10−12; rs2911280, beta = 0.09, P = 6 × 10−10) for dihydroepiandrosterone sulphate, a precursor to major sex-hormones, and for glycated haemoglobin (rs12819124, beta = −0.03, P = 4 × 10−9; rs761772, beta = 0.05, P = 5 × 10−9). rs12819124 is nominally associated with risk of type 2 diabetes. Our study offers insights into the genetic architecture of well-known and less well-studied biomarkers.
Collapse
|
52
|
Crane PK, Trittschuh E, Mukherjee S, Saykin AJ, Sanders RE, Larson EB, McCurry SM, McCormick W, Bowen JD, Grabowski T, Moore M, Bauman J, Gross AL, Keene CD, Bird TD, Gibbons LE, Mez J. Incidence of cognitively defined late-onset Alzheimer's dementia subgroups from a prospective cohort study. Alzheimers Dement 2017. [PMID: 28623677 DOI: 10.1016/j.jalz.2017.04.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
INTRODUCTION There may be biologically relevant heterogeneity within typical late-onset Alzheimer's dementia. METHODS We analyzed cognitive data from people with incident late-onset Alzheimer's dementia from a prospective cohort study. We determined individual averages across memory, visuospatial functioning, language, and executive functioning. We identified domains with substantial impairments relative to that average. We compared demographic, neuropathology, and genetic findings across groups defined by relative impairments. RESULTS During 32,286 person-years of follow-up, 869 people developed Alzheimer's dementia. There were 393 (48%) with no domain with substantial relative impairments. Some participants had isolated relative impairments in memory (148, 18%), visuospatial functioning (117, 14%), language (71, 9%), and executive functioning (66, 8%). The group with isolated relative memory impairments had higher proportions with ≥ APOE ε4 allele, more extensive Alzheimer's-related neuropathology, and higher proportions with other Alzheimer's dementia genetic risk variants. DISCUSSION A cognitive subgrouping strategy may identify biologically distinct subsets of people with Alzheimer's dementia.
Collapse
Affiliation(s)
- Paul K Crane
- Department of Medicine, University of Washington, Seattle, WA, USA.
| | - Emily Trittschuh
- VA Puget Sound Health Care System, Geriatric Research Education and Clinical Center, Seattle, WA, USA; Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | | | - Andrew J Saykin
- Department of Radiology and Imaging Sciences and the Indiana Alzheimer's Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA
| | | | - Eric B Larson
- Kaiser Permanente Washington Health Research Institute, Seattle, WA, USA
| | - Susan M McCurry
- Department of Psychosocial and Community Health, University of Washington, Seattle, WA, USA
| | - Wayne McCormick
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - James D Bowen
- Department of Neurology, Swedish Medical Center, Seattle, WA, USA
| | - Thomas Grabowski
- Department of Radiology, University of Washington, Seattle, WA, USA; Department of Neurology, University of Washington, Seattle, WA, USA
| | - Mackenzie Moore
- College of Arts and Sciences, University of Washington, Seattle, WA, USA
| | - Julianna Bauman
- College of Arts and Sciences, University of Washington, Seattle, WA, USA
| | - Alden L Gross
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - C Dirk Keene
- Department of Pathology, University of Washington, Seattle, WA, USA
| | - Thomas D Bird
- VA Puget Sound Health Care System, Geriatric Research Education and Clinical Center, Seattle, WA, USA; Department of Neurology, University of Washington, Seattle, WA, USA
| | - Laura E Gibbons
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - Jesse Mez
- Department of Neurology, Boston University School of Medicine, Boston, MA, USA
| |
Collapse
|
53
|
Psychometric Markers of Genuine and Feigned Neurodevelopmental Disorders in the Context of Applying for Academic Accommodations. PSYCHOLOGICAL INJURY & LAW 2017. [DOI: 10.1007/s12207-017-9287-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
54
|
te Meerman S, Batstra L, Hoekstra R, Grietens H. Academic textbooks [corrected] on ADHD genetics: balanced or biased? Int J Qual Stud Health Well-being 2017; 12:1305590. [PMID: 28532325 PMCID: PMC5510215 DOI: 10.1080/17482631.2017.1305590] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Academic text books [corrected] are essential assets for disseminating knowledge about ADHD to future healthcare professionals. This study examined if they are balanced with regard to genetics. We selected and analyzed study books (N=43) used in (pre) master's programmes at 10 universities in the Netherlands. Because the mere behaviourally informed quantitative genetics give a much higher effect size of the genetic involvement in ADHD, it is important that text books [corrected] contrast these findings with molecular genetics' outcomes. The latter studies use real genetic data, and their low effect sizes expose the potential weaknesses of quantitative genetics, like underestimating the involvement of the environment. Only a quarter of books mention both effect sizes and contrast these findings, while another quarter does not discuss any effect size. Most importantly, however, roughly half of the books in our sample mention only the effect sizes from quantitative genetic studies without addressing the low explained variance of molecular genetic studies. This may confuse readers by suggesting that the weakly associated genes support the quite spectacular, but potentially flawed estimates of twin, family and adoption studies, while they actually contradict them.
Collapse
Affiliation(s)
- Sanne te Meerman
- Department of Special Needs Education and Child Care, University of Groningen, the Netherlands
| | - Laura Batstra
- Department of Special Needs Education and Child Care, University of Groningen, the Netherlands
| | - Rink Hoekstra
- Department of Educational Sciences, Learning & Instruction, University of Groningen, the Netherlands
| | - Hans Grietens
- Department of Special Needs Education and Child Care, University of Groningen, the Netherlands
| |
Collapse
|
55
|
Smit DJ, Anokhin AP. Development and genetics of brain temporal stability related to attention problems in adolescent twins. Int J Psychophysiol 2017; 115:86-97. [DOI: 10.1016/j.ijpsycho.2016.07.498] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 07/08/2016] [Accepted: 07/10/2016] [Indexed: 11/30/2022]
|
56
|
Impact of home visit capacity on genetic association studies of late-onset Alzheimer's disease. Alzheimers Dement 2017; 13:933-939. [PMID: 28222301 DOI: 10.1016/j.jalz.2017.01.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 11/24/2016] [Accepted: 01/02/2017] [Indexed: 11/23/2022]
Abstract
INTRODUCTION Findings for genetic correlates of late-onset Alzheimer's disease (LOAD) in studies that rely solely on clinic visits may differ from those with capacity to follow participants unable to attend clinic visits. METHODS We evaluated previously identified LOAD-risk single nucleotide variants in the prospective Adult Changes in Thought study, comparing hazard ratios (HRs) estimated using the full data set of both in-home and clinic visits (n = 1697) to HRs estimated using only data that were obtained from clinic visits (n = 1308). Models were adjusted for age, sex, principal components to account for ancestry, and additional health indicators. RESULTS LOAD associations nominally differed for 4 of 21 variants; CR1 and APOE variants were significant after Bonferroni correction. DISCUSSION Estimates of genetic associations may differ for studies limited to clinic-only designs. Home visit capacity should be explored as a possible source of heterogeneity and potential bias in genetic studies.
Collapse
|
57
|
Lahey BB, Krueger RF, Rathouz PJ, Waldman ID, Zald DH. A hierarchical causal taxonomy of psychopathology across the life span. Psychol Bull 2017; 143:142-186. [PMID: 28004947 PMCID: PMC5269437 DOI: 10.1037/bul0000069] [Citation(s) in RCA: 249] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We propose a taxonomy of psychopathology based on patterns of shared causal influences identified in a review of multivariate behavior genetic studies that distinguish genetic and environmental influences that are either common to multiple dimensions of psychopathology or unique to each dimension. At the phenotypic level, first-order dimensions are defined by correlations among symptoms; correlations among first-order dimensions similarly define higher-order domains (e.g., internalizing or externalizing psychopathology). We hypothesize that the robust phenotypic correlations among first-order dimensions reflect a hierarchy of increasingly specific etiologic influences. Some nonspecific etiologic factors increase risk for all first-order dimensions of psychopathology to varying degrees through a general factor of psychopathology. Other nonspecific etiologic factors increase risk only for all first-order dimensions within a more specific higher-order domain. Furthermore, each first-order dimension has its own unique causal influences. Genetic and environmental influences common to family members tend to be nonspecific, whereas environmental influences unique to each individual are more dimension-specific. We posit that these causal influences on psychopathology are moderated by sex and developmental processes. This causal taxonomy also provides a novel framework for understanding the heterogeneity of each first-order dimension: Different persons exhibiting similar symptoms may be influenced by different combinations of etiologic influences from each of the 3 levels of the etiologic hierarchy. Furthermore, we relate the proposed causal taxonomy to transdimensional psychobiological processes, which also impact the heterogeneity of each psychopathology dimension. This causal taxonomy implies the need for changes in strategies for studying the etiology, psychobiology, prevention, and treatment of psychopathology. (PsycINFO Database Record
Collapse
Affiliation(s)
| | | | - Paul J Rathouz
- Department of Biostatistics and Medical Informatics, University of Wisconsin School of Medicine
| | | | | |
Collapse
|
58
|
Fedko IO, Wesseldijk LW, Nivard MG, Hottenga JJ, van Beijsterveldt CEM, Middeldorp CM, Bartels M, Boomsma DI. Heritability of Behavioral Problems in 7-Year Olds Based on Shared and Unique Aspects of Parental Views. Behav Genet 2016; 47:152-163. [PMID: 27796610 PMCID: PMC5306273 DOI: 10.1007/s10519-016-9823-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 10/05/2016] [Indexed: 11/25/2022]
Abstract
In studies of child psychopathology, phenotypes of interest are often obtained by parental ratings. When behavioral ratings are obtained in the context of a twin study, this allows for the decomposition of the phenotypic variance, into a genetic and a non-genetic part. If a phenotype is assessed by a single rater, heritability is based on the child’s behavior as expressed in the presence of that particular rater, whereas heritability based on assessments by multiple raters allows for the estimation of the heritability of the phenotype based on rater agreement, as well as the heritability of the rater specific view of the behavior. The aim of this twin study was to quantify the rater common and rater specific contributions to the variation in children’s behavioral problems. We estimated the heritability of maternal and paternal ratings of the Child Behavior Checklist (CBCL) 6–18 empirical emotional and behavioral problem scales in a large sample of 12,310 7-year old Dutch twin pairs. Between 30 and 59% of variation in the part of the phenotype parents agree upon was explained by genetic effects. Common environmental effects that make children in the same family similar explained less variance, ranging between 0 and 32%. For unique views of their children’s behavioral problems, heritability ranged between 0 and 20% for maternal and between 0 and 22% for paternal views. Between 7 and 24% of the variance was accounted for by common environmental factors specific to mother and father’s views. The proportion of rater shared and rater specific heritability can be translated into genetic correlations between parental views and inform the design and interpretation of results of molecular genetic studies. Genetic correlations were nearly or above 0.7 for all CBCL based psychopathology scales. Such large genetic correlations suggest two practical guidelines for genome-wide association studies (GWAS): when studies have collected data from either fathers or mothers, the shared genetic aetiology in parental ratings indicates that is possible to analyze paternal and maternal assessments in a single GWAS or meta-analysis. Secondly, if a study has collected information from both parents, a gain in statistical power may be realized in GWAS by the simultaneous analysis of the data.
Collapse
Affiliation(s)
- Iryna O Fedko
- Department of Biological Psychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081BT, Amsterdam, The Netherlands.
| | - Laura W Wesseldijk
- Department of Biological Psychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081BT, Amsterdam, The Netherlands
- EMGO+ Institute for Health and Care Research, VU Medical Center, Amsterdam, The Netherlands
| | - Michel G Nivard
- Department of Biological Psychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081BT, Amsterdam, The Netherlands
| | - Jouke-Jan Hottenga
- Department of Biological Psychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081BT, Amsterdam, The Netherlands
- EMGO+ Institute for Health and Care Research, VU Medical Center, Amsterdam, The Netherlands
| | - Catharina E M van Beijsterveldt
- Department of Biological Psychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081BT, Amsterdam, The Netherlands
| | - Christel M Middeldorp
- Department of Biological Psychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081BT, Amsterdam, The Netherlands
- Neuroscience Campus Amsterdam, Amsterdam, The Netherlands
- Department of Child and Adolescent Psychiatry, GGZ inGeest/VU Medical Center, Amsterdam, The Netherlands
| | - Meike Bartels
- Department of Biological Psychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081BT, Amsterdam, The Netherlands
- EMGO+ Institute for Health and Care Research, VU Medical Center, Amsterdam, The Netherlands
- Neuroscience Campus Amsterdam, Amsterdam, The Netherlands
| | - Dorret I Boomsma
- Department of Biological Psychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081BT, Amsterdam, The Netherlands
- EMGO+ Institute for Health and Care Research, VU Medical Center, Amsterdam, The Netherlands
- Neuroscience Campus Amsterdam, Amsterdam, The Netherlands
| |
Collapse
|
59
|
Ashenhurst JR, Harden KP, Corbin WR, Fromme K. Alcohol-related genes show an enrichment of associations with a persistent externalizing factor. JOURNAL OF ABNORMAL PSYCHOLOGY 2016; 125:933-945. [PMID: 27505405 DOI: 10.1037/abn0000194] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Research using twins has found that much of the variability in externalizing phenotypes-including alcohol and drug use, impulsive personality traits, risky sex, and property crime-is explained by genetic factors. Nevertheless, identification of specific genes and variants associated with these traits has proven to be difficult, likely because individual differences in externalizing are explained by many genes of small individual effect. Moreover, twin research indicates that heritable variance in externalizing behaviors is mostly shared across the externalizing spectrum rather than specific to any behavior. We use a longitudinal, "deep phenotyping" approach to model a general externalizing factor reflecting persistent engagement in a variety of socially problematic behaviors measured at 11 assessment occasions spanning early adulthood (ages 18 to 28). In an ancestrally homogenous sample of non-Hispanic Whites (N = 337), we then tested for enrichment of associations between the persistent externalizing factor and a set of 3,281 polymorphisms within 104 genes that were previously identified as associated with alcohol-use behaviors. Next, we tested for enrichment among domain-specific factors (e.g., property crime) composed of residual variance not accounted for by the common factor. Significance was determined relative to bootstrapped empirical thresholds derived from permutations of phenotypic data. Results indicated significant enrichment of genetic associations for persistent externalizing, but not for domain-specific factors. Consistent with twin research findings, these results suggest that genetic variants are broadly associated with externalizing behaviors rather than unique to specific behaviors. (PsycINFO Database Record
Collapse
|
60
|
Vroom CR, Posthuma D, Li MX, Dolan CV, van der Sluis S. Multivariate Gene-Based Association Test on Family Data in MGAS. Behav Genet 2016; 46:718-725. [PMID: 27048268 DOI: 10.1007/s10519-016-9787-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 03/12/2016] [Indexed: 11/25/2022]
Abstract
In analyses of unrelated individuals, the program multivariate gene-based association test by extended Simes (MGAS), which facilitates multivariate gene-based association testing, was shown to have correct Type I error rate and superior statistical power compared to other multivariate gene-based approaches. Here we show, through simulation, that MGAS can also be applied to data including genetically related subjects (e.g., family data), by using p value information obtained in Plink or in generalized estimating equations (with the 'exchangeable' working correlation matrix), both of which account for the family structure on a univariate single nucleotide polymorphism-based level by applying a sandwich correction of standard errors. We show that when applied to family-data, MGAS has correct Type I error rate, and given the details of the simulation setup, adequate power. Application of MGAS to seven eye measurement phenotypes showed statistically significant association with two genes that were not discovered in previous univariate analyses of a composite score. We conclude that MGAS is a useful and convenient tool for multivariate gene-based genome-wide association analysis in both unrelated and related individuals.
Collapse
Affiliation(s)
- César-Reyer Vroom
- Department of Clinical Genetics, Section Complex Traits Genetics, VU Medical Center (VUmc), Neuroscience Campus Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands.
| | - Danielle Posthuma
- Department of Clinical Genetics, Section Complex Traits Genetics, VU Medical Center (VUmc), Neuroscience Campus Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands.,Department of Complex Traits Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University, Neuroscience Campus Amsterdam, Amsterdam, The Netherlands
| | - Miao-Xin Li
- Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong.,State Key Laboratory for Cognitive and Brain Sciences, The University of Hong Kong, Pokfulam, Hong Kong.,The Centre for Reproduction, Development and Growth, The University of Hong Kong, Pokfulam, Hong Kong.,The Centre for Genomic Sciences, The University of Hong Kong, Pokfulam, Hong Kong
| | - Conor V Dolan
- Department of Biological Psychology, VU University Amsterdam, Van der Boechorststraat 1, 1081 BT, Amsterdam, The Netherlands
| | - Sophie van der Sluis
- Department of Clinical Genetics, Section Complex Traits Genetics, VU Medical Center (VUmc), Neuroscience Campus Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
| |
Collapse
|
61
|
Neuropsychological performance measures as intermediate phenotypes for attention-deficit/hyperactivity disorder: A multiple mediation analysis. Dev Psychopathol 2016; 29:259-272. [PMID: 27049476 DOI: 10.1017/s0954579416000195] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Genetic influences on dopaminergic neurotransmission have been implicated in attention-deficit hyperactivity disorder (ADHD) and are theorized to impact cognitive functioning via alterations in frontal-striatal circuitry. Neuropsychological functioning has been proposed to account for the potential associations between dopamine candidate genes and ADHD. However, to date, this mediation hypothesis has not been directly tested. Participants were 498 youth ages 6-17 years (mean M = 10.8 years, SD = 2.4 years, 55.0% male). All youth completed a multistage, multiple-informant assessment procedure to identify ADHD and non-ADHD cases, as well as a comprehensive neuropsychological battery. Youth provided a saliva sample for DNA analyses; the 480 base pair variable number of tandem repeat polymorphism of the dopamine active transporter 1 gene (DAT1) and the 120 base pair promoter polymorphism of the dopamine receptor D4 gene (DRD4) were genotyped. Multiple mediation analysis revealed significant indirect associations between DAT1 genotype and inattention, hyperactivity-impulsivity, and oppositionality, with specific indirect effects through response inhibition. The results highlight the role of neurocognitive task performance, particularly response inhibition, as a potential intermediate phenotype for ADHD, further elucidating the relationship between genetic polymorphisms and externalizing psychopathology.
Collapse
|
62
|
Schwabe I, Jonker W, van den Berg SM. Genes, Culture and Conservatism-A Psychometric-Genetic Approach. Behav Genet 2015; 46:516-28. [PMID: 26590135 PMCID: PMC4886154 DOI: 10.1007/s10519-015-9768-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 10/25/2015] [Indexed: 11/26/2022]
Abstract
The Wilson−Patterson conservatism scale was psychometrically evaluated using homogeneity analysis and item response theory models. Results showed that this scale actually measures two different aspects in people: on the one hand people vary in their agreement with either conservative or liberal catch-phrases and on the other hand people vary in their use of the “?” response category of the scale. A 9-item subscale was constructed, consisting of items that seemed to measure liberalism, and this subscale was subsequently used in a biometric analysis including genotype–environment interaction, correcting for non-homogeneous measurement error. Biometric results showed significant genetic and shared environmental influences, and significant genotype–environment interaction effects, suggesting that individuals with a genetic predisposition for conservatism show more non-shared variance but less shared variance than individuals with a genetic predisposition for liberalism.
Collapse
Affiliation(s)
- Inga Schwabe
- Department of Research Methodology, Measurement, and Data Analysis, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands.
| | - Wilfried Jonker
- Department of Research Methodology, Measurement, and Data Analysis, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Stéphanie M van den Berg
- Department of Research Methodology, Measurement, and Data Analysis, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| |
Collapse
|
63
|
Latendresse SJ, Henry DB, Aggen SH, Byck GR, Ashbeck AW, Bolland JM, Sun C, Riley BP, Mustanski B, Dick DM. Dimensionality and Genetic Correlates of Problem Behavior in Low-Income African American Adolescents. JOURNAL OF CLINICAL CHILD AND ADOLESCENT PSYCHOLOGY 2015; 46:824-839. [PMID: 26514393 DOI: 10.1080/15374416.2015.1070353] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Researchers have long observed that problem behaviors tend to cluster together, particularly among adolescents. Epidemiological studies have suggested that this covariation is due, in part, to common genetic influences, and a number of plausible candidates have emerged as targets for investigation. To date, however, genetic association studies of these behaviors have focused mostly on unidimensional models of individual phenotypes within European American samples. Herein, we compared a series of confirmatory factor models to best characterize the structure of problem behavior (alcohol and marijuana use, sexual behavior, and disruptive behavior) within a representative community-based sample of 592 low-income African American adolescents (50.3% female), ages 13 to 18. We further explored the extent to which 3 genes previously implicated for their role in similar behavioral dimensions (CHRM2, GABRA2, and OPRM1) independently accounted for variance within factors specified in the best-fitting model. Supplementary analyses were conducted to derive comparative estimates for the predictive utility of these genes in more traditional unidimensional models. Findings provide initial evidence for a bifactor structure of problem behavior among African American adolescents and highlight novel genetic correlates of specific behavioral dimensions otherwise undetected in an orthogonal syndromal factor. Implications of this approach include increased precision in the assessment of problem behavior, with corresponding increases in the reliability and validity of identified genetic associations. As a corollary, the comparison of primary and supplementary association analyses illustrates the potential for overlooking and/or overinterpreting meaningful genetic effects when failing to adequately account for phenotypic complexity.
Collapse
Affiliation(s)
| | - David B Henry
- b School of Public Health , University of Illinois at Chicago
| | - Steven H Aggen
- c Department of Psychiatry , Virginia Commonwealth University
| | - Gayle R Byck
- d Department of Medical Social Sciences , Northwestern University
| | - Alan W Ashbeck
- d Department of Medical Social Sciences , Northwestern University
| | - John M Bolland
- e College of Human Environmental Sciences , University of Alabama at Tuscaloosa
| | - Cuie Sun
- c Department of Psychiatry , Virginia Commonwealth University
| | - Brien P Riley
- c Department of Psychiatry , Virginia Commonwealth University
| | - Brian Mustanski
- d Department of Medical Social Sciences , Northwestern University
| | - Danielle M Dick
- c Department of Psychiatry , Virginia Commonwealth University
| |
Collapse
|
64
|
Xu MK, Gaysina D, Barnett JH, Scoriels L, van de Lagemaat LN, Wong A, Richards M, Croudace TJ, Jones PB. Psychometric precision in phenotype definition is a useful step in molecular genetic investigation of psychiatric disorders. Transl Psychiatry 2015; 5:e593. [PMID: 26125156 PMCID: PMC4490295 DOI: 10.1038/tp.2015.86] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 05/08/2015] [Accepted: 05/21/2015] [Indexed: 12/20/2022] Open
Abstract
Affective disorders are highly heritable, but few genetic risk variants have been consistently replicated in molecular genetic association studies. The common method of defining psychiatric phenotypes in molecular genetic research is either a summation of symptom scores or binary threshold score representing the risk of diagnosis. Psychometric latent variable methods can improve the precision of psychiatric phenotypes, especially when the data structure is not straightforward. Using data from the British 1946 birth cohort, we compared summary scores with psychometric modeling based on the General Health Questionnaire (GHQ-28) scale for affective symptoms in an association analysis of 27 candidate genes (249 single-nucleotide polymorphisms (SNPs)). The psychometric method utilized a bi-factor model that partitioned the phenotype variances into five orthogonal latent variable factors, in accordance with the multidimensional data structure of the GHQ-28 involving somatic, social, anxiety and depression domains. Results showed that, compared with the summation approach, the affective symptoms defined by the bi-factor psychometric model had a higher number of associated SNPs of larger effect sizes. These results suggest that psychometrically defined mental health phenotypes can reflect the dimensions of complex phenotypes better than summation scores, and therefore offer a useful approach in genetic association investigations.
Collapse
Affiliation(s)
- M K Xu
- Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK,Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Worts Causeway, Cambridge CB1 8RN, UK. E-mail:
| | - D Gaysina
- Rudd Centre for Adoption Research and Practice, School of Psychology, University of Sussex, Brighton, UK
| | - J H Barnett
- Department of Psychiatry, University of Cambridge, Cambridge, UK,Cambridge Cognition, Cambridge, UK
| | - L Scoriels
- Department of Psychiatry, University of Cambridge, Cambridge, UK,Instituto de Psiquiatria, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - A Wong
- MRC Unit for Lifelong Health and Ageing at University College London, London, UK
| | - M Richards
- MRC Unit for Lifelong Health and Ageing at University College London, London, UK
| | - T J Croudace
- School of Nursing and Midwifery, University of Dundee, Dundee, UK
| | - P B Jones
- Department of Psychiatry, University of Cambridge, Cambridge, UK
| | | |
Collapse
|
65
|
Mendelian and polygenic inheritance of intelligence: A common set of causal genes? Using next-generation sequencing to examine the effects of 168 intellectual disability genes on normal-range intelligence. INTELLIGENCE 2015. [DOI: 10.1016/j.intell.2014.12.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
66
|
Knowles EEM, Mathias SR, McKay DR, Sprooten E, Blangero J, Almasy L, Glahn DC. Genome-Wide Analyses of Working-Memory Ability: A Review. Curr Behav Neurosci Rep 2014; 1:224-233. [PMID: 25729637 PMCID: PMC4339023 DOI: 10.1007/s40473-014-0028-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Working memory, a theoretical construct from the field of cognitive psychology, is crucial to everyday life. It refers to the ability to temporarily store and manipulate task-relevant information. The identification of genes for working memory might shed light on the molecular mechanisms of this important cognitive ability and-given the genetic overlap between, for example, schizophrenia risk and working-memory ability-might also reveal important candidate genes for psychiatric illness. A number of genome-wide searches for genes that influence working memory have been conducted in recent years. Interestingly, the results of those searches converge on the mediating role of neuronal excitability in working-memory performance, such that the role of each gene highlighted by genome-wide methods plays a part in ion channel formation and/or dopaminergic signaling in the brain, with either direct or indirect influence on dopamine levels in the prefrontal cortex. This result dovetails with animal models of working memory that highlight the role of dynamic network connectivity, as mediated by dopaminergic signaling, in the dorsolateral prefrontal cortex. Future work, which aims to characterize functional variants influencing working-memory ability, might choose to focus on those genes highlighted in the present review and also those networks in which the genes fall. Confirming gene associations and highlighting functional characterization of those associations might have implications for the understanding of normal variation in working-memory ability and also for the development of drugs for mental illness.
Collapse
Affiliation(s)
- E E M Knowles
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA; Olin Neuropsychiatric Research Center, Institute of Living, Hartford, Hospital, Hartford, CT, USA
| | - S R Mathias
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA; Olin Neuropsychiatric Research Center, Institute of Living, Hartford, Hospital, Hartford, CT, USA
| | - D R McKay
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA; Olin Neuropsychiatric Research Center, Institute of Living, Hartford, Hospital, Hartford, CT, USA
| | - E Sprooten
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA; Olin Neuropsychiatric Research Center, Institute of Living, Hartford, Hospital, Hartford, CT, USA
| | - John Blangero
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Laura Almasy
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, TX, USA
| | - D C Glahn
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA; Olin Neuropsychiatric Research Center, Institute of Living, Hartford, Hospital, Hartford, CT, USA
| |
Collapse
|
67
|
Van der Sluis S, Dolan CV, Li J, Song Y, Sham P, Posthuma D, Li MX. MGAS: a powerful tool for multivariate gene-based genome-wide association analysis. ACTA ACUST UNITED AC 2014; 31:1007-15. [PMID: 25431328 PMCID: PMC4382905 DOI: 10.1093/bioinformatics/btu783] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 11/19/2014] [Indexed: 01/10/2023]
Abstract
Motivation: Standard genome-wide association studies, testing the association between one phenotype and a large number of single nucleotide polymorphisms (SNPs), are limited in two ways: (i) traits are often multivariate, and analysis of composite scores entails loss in statistical power and (ii) gene-based analyses may be preferred, e.g. to decrease the multiple testing problem. Results: Here we present a new method, multivariate gene-based association test by extended Simes procedure (MGAS), that allows gene-based testing of multivariate phenotypes in unrelated individuals. Through extensive simulation, we show that under most trait-generating genotype–phenotype models MGAS has superior statistical power to detect associated genes compared with gene-based analyses of univariate phenotypic composite scores (i.e. GATES, multiple regression), and multivariate analysis of variance (MANOVA). Re-analysis of metabolic data revealed 32 False Discovery Rate controlled genome-wide significant genes, and 12 regions harboring multiple genes; of these 44 regions, 30 were not reported in the original analysis. Conclusion: MGAS allows researchers to conduct their multivariate gene-based analyses efficiently, and without the loss of power that is often associated with an incorrectly specified genotype–phenotype models. Availability and implementation: MGAS is freely available in KGG v3.0 (http://statgenpro.psychiatry.hku.hk/limx/kgg/download.php). Access to the metabolic dataset can be requested at dbGaP (https://dbgap.ncbi.nlm.nih.gov/). The R-simulation code is available from http://ctglab.nl/people/sophie_van_der_sluis. Contact: mxli@hku.hk Supplementary information: Supplementary data are available at Bioinformatics online.
Collapse
Affiliation(s)
- Sophie Van der Sluis
- Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands
| | - Conor V Dolan
- Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands
| | - Jiang Li
- Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands
| | - Youqiang Song
- Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics
| | - Pak Sham
- Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics
| | - Danielle Posthuma
- Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands
| | - Miao-Xin Li
- Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics, Section Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU Medical Center, Amsterdam, The Netherlands, Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands,Department of Biochemistry, State Key Laboratory for Cognitive and Brain Sciences, The Centre for Reproduction, Development and Growth, The Centre for Genomic Sciences and Department of Psychiatry, The University of Hong Kong, Pokfulam, Hong Kong and Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, Amsterdam, The Netherlands Department of Complex Trait Genetics
| |
Collapse
|
68
|
Genetic and Environmental Stability of Intelligence in Childhood and Adolescence. Twin Res Hum Genet 2014; 17:151-63. [DOI: 10.1017/thg.2014.26] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The present study examined the genetic and environmental contributions to the temporal stability of verbal, non-verbal and general intelligence across a developmental period spanning childhood and adolescence (5–18 years). Longitudinal twin data collected in four different studies on a total of 1,748 twins, comprising 4,641 measurement points in total, were analyzed using genetic adaptations of the simplex model. The heterogeneity in the type of instrument used to assess psychometric intelligence across the different subsamples and ages allowed us to address the auxiliary question of how to optimally utilize the existing longitudinal data in the context of gene-finding studies. The results were consistent across domains (verbal, non-verbal and general intelligence), and indicated that phenotypic stability was driven primarily by the high stability of additive genetic factors, that the stability of common environment was moderate, and that the unique environment contributed primarily to change. The cross-subscale stability was consistently low, indicating a small overlap between different domains of intelligence over time. The high stability of additive genetic factors justifies the use of a linear combination of scores across the different ages in the context of gene-finding studies.
Collapse
|
69
|
Liao J, Li X, Wong TY, Wang JJ, Khor CC, Tai ES, Aung T, Teo YY, Cheng CY. Impact of measurement error on testing genetic association with quantitative traits. PLoS One 2014; 9:e87044. [PMID: 24475218 PMCID: PMC3901720 DOI: 10.1371/journal.pone.0087044] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 12/17/2013] [Indexed: 12/23/2022] Open
Abstract
Measurement error of a phenotypic trait reduces the power to detect genetic associations. We examined the impact of sample size, allele frequency and effect size in presence of measurement error for quantitative traits. The statistical power to detect genetic association with phenotype mean and variability was investigated analytically. The non-centrality parameter for a non-central F distribution was derived and verified using computer simulations. We obtained equivalent formulas for the cost of phenotype measurement error. Effects of differences in measurements were examined in a genome-wide association study (GWAS) of two grading scales for cataract and a replication study of genetic variants influencing blood pressure. The mean absolute difference between the analytic power and simulation power for comparison of phenotypic means and variances was less than 0.005, and the absolute difference did not exceed 0.02. To maintain the same power, a one standard deviation (SD) in measurement error of a standard normal distributed trait required a one-fold increase in sample size for comparison of means, and a three-fold increase in sample size for comparison of variances. GWAS results revealed almost no overlap in the significant SNPs (p<10−5) for the two cataract grading scales while replication results in genetic variants of blood pressure displayed no significant differences between averaged blood pressure measurements and single blood pressure measurements. We have developed a framework for researchers to quantify power in the presence of measurement error, which will be applicable to studies of phenotypes in which the measurement is highly variable.
Collapse
Affiliation(s)
- Jiemin Liao
- Department of Ophthalmology, National University of Singapore and National University Health System, Singapore, Singapore
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
| | - Xiang Li
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Department of Statistics and Applied Probability, National University of Singapore, Singapore, Singapore
| | - Tien-Yin Wong
- Department of Ophthalmology, National University of Singapore and National University Health System, Singapore, Singapore
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Saw Swee Hock School of Public Health, National University Health System, National University of Singapore, Singapore, Singapore
| | - Jie Jin Wang
- Centre for Vision Research, University of Sydney, Sydney, Australia
| | - Chiea Chuen Khor
- Department of Ophthalmology, National University of Singapore and National University Health System, Singapore, Singapore
- Division of Human Genetics, Genome Institute of Singapore, Singapore, Singapore
| | - E. Shyong Tai
- Saw Swee Hock School of Public Health, National University Health System, National University of Singapore, Singapore, Singapore
- Department of Medicine, National University of Singapore and National University Health System, Singapore, Singapore
- Duke-NUS Graduate Medical School, Singapore, Singapore
| | - Tin Aung
- Department of Ophthalmology, National University of Singapore and National University Health System, Singapore, Singapore
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
| | - Yik-Ying Teo
- Department of Statistics and Applied Probability, National University of Singapore, Singapore, Singapore
- Saw Swee Hock School of Public Health, National University Health System, National University of Singapore, Singapore, Singapore
| | - Ching-Yu Cheng
- Department of Ophthalmology, National University of Singapore and National University Health System, Singapore, Singapore
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Saw Swee Hock School of Public Health, National University Health System, National University of Singapore, Singapore, Singapore
- Duke-NUS Graduate Medical School, Singapore, Singapore
- * E-mail:
| |
Collapse
|
70
|
Akutagava-Martins GC, Salatino-Oliveira A, Kieling CC, Rohde LA, Hutz MH. Genetics of attention-deficit/hyperactivity disorder: current findings and future directions. Expert Rev Neurother 2014; 13:435-45. [DOI: 10.1586/ern.13.30] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
71
|
Affiliation(s)
- Stephen B. Manuck
- Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania 15260;
| | - Jeanne M. McCaffery
- Department of Psychiatry and Human Behavior, The Miriam Hospital, and Warren Alpert School of Medicine at Brown University, Providence, Rhode Island 02903;
| |
Collapse
|
72
|
Knowles EEM, Carless MA, de Almeida MAA, Curran JE, McKay DR, Sprooten E, Dyer TD, Göring HH, Olvera R, Fox P, Almasy L, Duggirala R, Kent JW, Blangero J, Glahn DC. Genome-wide significant localization for working and spatial memory: Identifying genes for psychosis using models of cognition. Am J Med Genet B Neuropsychiatr Genet 2014; 165B:84-95. [PMID: 24243780 PMCID: PMC4106137 DOI: 10.1002/ajmg.b.32211] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Accepted: 10/15/2013] [Indexed: 12/31/2022]
Abstract
It is well established that risk for developing psychosis is largely mediated by the influence of genes, but identifying precisely which genes underlie that risk has been problematic. Focusing on endophenotypes, rather than illness risk, is one solution to this problem. Impaired cognition is a well-established endophenotype of psychosis. Here we aimed to characterize the genetic architecture of cognition using phenotypically detailed models as opposed to relying on general IQ or individual neuropsychological measures. In so doing we hoped to identify genes that mediate cognitive ability, which might also contribute to psychosis risk. Hierarchical factor models of genetically clustered cognitive traits were subjected to linkage analysis followed by QTL region-specific association analyses in a sample of 1,269 Mexican American individuals from extended pedigrees. We identified four genome wide significant QTLs, two for working and two for spatial memory, and a number of plausible and interesting candidate genes. The creation of detailed models of cognition seemingly enhanced the power to detect genetic effects on cognition and provided a number of possible candidate genes for psychosis.
Collapse
Affiliation(s)
- Emma E. M. Knowles
- Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut and Olin Neuropsychiatric Research Center, Institute of Living, Hartford Hospital, Hartford, Connecticut
| | - Melanie A. Carless
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, Texas
| | | | - Joanne E. Curran
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, Texas
| | - D. Reese McKay
- Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut and Olin Neuropsychiatric Research Center, Institute of Living, Hartford Hospital, Hartford, Connecticut
| | - Emma Sprooten
- Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut and Olin Neuropsychiatric Research Center, Institute of Living, Hartford Hospital, Hartford, Connecticut
| | - Thomas D. Dyer
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, Texas
| | - Harald H. Göring
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, Texas
| | - Rene Olvera
- Department of Psychiatry, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Peter Fox
- Research Imaging Institute, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Laura Almasy
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, Texas
| | - Ravi Duggirala
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, Texas
| | - Jack W. Kent
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, Texas
| | - John Blangero
- Department of Genetics, Texas Biomedical Research Institute, San Antonio, Texas
| | - David. C. Glahn
- Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut and Olin Neuropsychiatric Research Center, Institute of Living, Hartford Hospital, Hartford, Connecticut
| |
Collapse
|
73
|
Hill WD, Davies G, van de Lagemaat LN, Christoforou A, Marioni RE, Fernandes CPD, Liewald DC, Croning MDR, Payton A, Craig LCA, Whalley LJ, Horan M, Ollier W, Hansell NK, Wright MJ, Martin NG, Montgomery GW, Steen VM, Le Hellard S, Espeseth T, Lundervold AJ, Reinvang I, Starr JM, Pendleton N, Grant SGN, Bates TC, Deary IJ. Human cognitive ability is influenced by genetic variation in components of postsynaptic signalling complexes assembled by NMDA receptors and MAGUK proteins. Transl Psychiatry 2014; 4:e341. [PMID: 24399044 PMCID: PMC3905224 DOI: 10.1038/tp.2013.114] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 09/12/2013] [Accepted: 10/21/2013] [Indexed: 12/11/2022] Open
Abstract
Differences in general cognitive ability (intelligence) account for approximately half of the variation in any large battery of cognitive tests and are predictive of important life events including health. Genome-wide analyses of common single-nucleotide polymorphisms indicate that they jointly tag between a quarter and a half of the variance in intelligence. However, no single polymorphism has been reliably associated with variation in intelligence. It remains possible that these many small effects might be aggregated in networks of functionally linked genes. Here, we tested a network of 1461 genes in the postsynaptic density and associated complexes for an enriched association with intelligence. These were ascertained in 3511 individuals (the Cognitive Ageing Genetics in England and Scotland (CAGES) consortium) phenotyped for general cognitive ability, fluid cognitive ability, crystallised cognitive ability, memory and speed of processing. By analysing the results of a genome wide association study (GWAS) using Gene Set Enrichment Analysis, a significant enrichment was found for fluid cognitive ability for the proteins found in the complexes of N-methyl-D-aspartate receptor complex; P=0.002. Replication was sought in two additional cohorts (N=670 and 2062). A meta-analytic P-value of 0.003 was found when these were combined with the CAGES consortium. The results suggest that genetic variation in the macromolecular machines formed by membrane-associated guanylate kinase (MAGUK) scaffold proteins and their interaction partners contributes to variation in intelligence.
Collapse
Affiliation(s)
- W D Hill
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK
| | - G Davies
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK,Medical Genetics Section, The University of Edinburgh Molecular Medicine Centre, Institute of Genetics and Molecular Medicine, Western General Hospital Edinburgh, Edinburgh, UK
| | - L N van de Lagemaat
- Genes to Cognition Programme, Centre for Clinical Brain Sciences and Centre for Neuroregeneration The University of Edinburgh, Edinburgh, UK
| | - A Christoforou
- Center for Medical Genetics and Molecular Medicine, Haukeland University Hospital, Bergen, Norway,Dr E. Martens Research Group for Biological Psychiatry, Department of Clinical Science, University of Bergen, Bergen, Norway
| | - R E Marioni
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK,Medical Genetics Section, The University of Edinburgh Molecular Medicine Centre, Institute of Genetics and Molecular Medicine, Western General Hospital Edinburgh, Edinburgh, UK,Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - C P D Fernandes
- Center for Medical Genetics and Molecular Medicine, Haukeland University Hospital, Bergen, Norway,Dr E. Martens Research Group for Biological Psychiatry, Department of Clinical Science, University of Bergen, Bergen, Norway
| | - D C Liewald
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK
| | - M D R Croning
- Genes to Cognition Programme, Centre for Clinical Brain Sciences and Centre for Neuroregeneration The University of Edinburgh, Edinburgh, UK
| | - A Payton
- Centre for Integrated Genomic Medical Research, University of Manchester, Manchester, UK
| | - L C A Craig
- Public Health Nutrition Research Group Section of Population Health, University of Aberdeen, Aberdeen, UK
| | - L J Whalley
- Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK
| | - M Horan
- Centre for Clinical and Cognitive Neurosciences, Institute Brain, Behaviour and Mental Health, University of Manchester, Manchester, UK
| | - W Ollier
- Centre for Integrated Genomic Medical Research, University of Manchester, Manchester, UK
| | - N K Hansell
- Queensland Institute of Medical Research, Brisbane, QLD, Australia
| | - M J Wright
- Queensland Institute of Medical Research, Brisbane, QLD, Australia
| | - N G Martin
- Queensland Institute of Medical Research, Brisbane, QLD, Australia
| | - G W Montgomery
- Queensland Institute of Medical Research, Brisbane, QLD, Australia
| | - V M Steen
- Center for Medical Genetics and Molecular Medicine, Haukeland University Hospital, Bergen, Norway,Dr E. Martens Research Group for Biological Psychiatry, Department of Clinical Science, University of Bergen, Bergen, Norway
| | - S Le Hellard
- Center for Medical Genetics and Molecular Medicine, Haukeland University Hospital, Bergen, Norway,Dr E. Martens Research Group for Biological Psychiatry, Department of Clinical Science, University of Bergen, Bergen, Norway
| | - T Espeseth
- Department of Psychology, University of Oslo, Oslo, Norway,KG Jebsen Centre for Psychosis Research, Oslo University Hospital, Oslo, Norway
| | - A J Lundervold
- Department of Biological and Medical Psychology, University of Bergen, Bergen, Norway,Kavli Research Centre for Aging and Dementia, Haraldplass Hospital, Bergen, Norway
| | - I Reinvang
- Department of Psychology, University of Oslo, Oslo, Norway
| | - J M Starr
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK
| | - N Pendleton
- Centre for Clinical and Cognitive Neurosciences, Institute Brain, Behaviour and Mental Health, University of Manchester, Manchester, UK
| | - S G N Grant
- Genes to Cognition Programme, Centre for Clinical Brain Sciences and Centre for Neuroregeneration The University of Edinburgh, Edinburgh, UK
| | - T C Bates
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK
| | - I J Deary
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK,Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, 7 George Square, Edinburgh EH8 9JZ, UK. E-mail:
| |
Collapse
|
74
|
Zhou JJ, Cho MH, Castaldi PJ, Hersh CP, Silverman EK, Laird NM. Heritability of chronic obstructive pulmonary disease and related phenotypes in smokers. Am J Respir Crit Care Med 2013; 188:941-7. [PMID: 23972146 DOI: 10.1164/rccm.201302-0263oc] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE Previous studies of chronic obstructive pulmonary disease (COPD) have suggested that genetic factors play an important role in the development of disease. However, single-nucleotide polymorphisms that are associated with COPD in genome-wide association studies have been shown to account for only a small percentage of the genetic variance in phenotypes of COPD, such as spirometry and imaging variables. These phenotypes are highly predictive of disease, and family studies have shown that spirometric phenotypes are heritable. OBJECTIVES To assess the heritability and coheritability of four major COPD-related phenotypes (measurements of FEV1, FEV1/FVC, percent emphysema, and percent gas trapping), and COPD affection status in smokers of non-Hispanic white and African American descent using a population design. METHODS Single-nucleotide polymorphisms from genome-wide association studies chips were used to calculate the relatedness of pairs of individuals and a mixed model was adopted to estimate genetic variance and covariance. MEASUREMENTS AND MAIN RESULTS In the non-Hispanic whites, estimated heritabilities of FEV1 and FEV1/FVC were both about 37%, consistent with estimates in the literature from family-based studies. For chest computed tomography scan phenotypes, estimated heritabilities were both close to 25%. Heritability of COPD affection status was estimated as 37.7% in both populations. CONCLUSIONS This study suggests that a large portion of the genetic risk of COPD is yet to be discovered and gives rationale for additional genetic studies of COPD. The estimates of coheritability (genetic covariance) for pairs of the phenotypes suggest considerable overlap of causal genetic loci.
Collapse
Affiliation(s)
- Jin J Zhou
- 1 Biostatistics Department, Harvard School of Public Health, Boston, Massachusetts
| | | | | | | | | | | |
Collapse
|
75
|
Lubke GH, Laurin C, Walters R, Eriksson N, Hysi P, Spector TD, Montgomery GW, Martin NG, Medland SE, Boomsma DI. Gradient Boosting as a SNP Filter: an Evaluation Using Simulated and Hair Morphology Data. JOURNAL OF DATA MINING IN GENOMICS & PROTEOMICS 2013; 4:10.4172/2153-0602.1000143. [PMID: 24404405 PMCID: PMC3882018 DOI: 10.4172/2153-0602.1000143] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Typically, genome-wide association studies consist of regressing the phenotype on each SNP separately using an additive genetic model. Although statistical models for recessive, dominant, SNP-SNP, or SNP-environment interactions exist, the testing burden makes an evaluation of all possible effects impractical for genome-wide data. We advocate a two-step approach where the first step consists of a filter that is sensitive to different types of SNP main and interactions effects. The aim is to substantially reduce the number of SNPs such that more specific modeling becomes feasible in a second step. We provide an evaluation of a statistical learning method called "gradient boosting machine" (GBM) that can be used as a filter. GBM does not require an a priori specification of a genetic model, and permits inclusion of large numbers of covariates. GBM can therefore be used to explore multiple GxE interactions, which would not be feasible within the parametric framework used in GWAS. We show in a simulation that GBM performs well even under conditions favorable to the standard additive regression model commonly used in GWAS, and is sensitive to the detection of interaction effects even if one of the interacting variables has a zero main effect. The latter would not be detected in GWAS. Our evaluation is accompanied by an analysis of empirical data concerning hair morphology. We estimate the phenotypic variance explained by increasing numbers of highest ranked SNPs, and show that it is sufficient to select 10K-20K SNPs in the first step of a two-step approach.
Collapse
Affiliation(s)
- GH Lubke
- Department of Psychology, University of Notre Dame, Notre Dame, IN, USA
- Department of Biological Psychology, VU University Amsterdam, Amsterdam Netherlands
| | - C Laurin
- Department of Psychology, University of Notre Dame, Notre Dame, IN, USA
| | - R Walters
- Department of Psychology, University of Notre Dame, Notre Dame, IN, USA
| | | | - P Hysi
- Twin Research and Genetic Epidemiology, Genetic Epidemiologist, King's College London, London, England
| | - TD Spector
- Twin Research and Genetic Epidemiology, Genetic Epidemiologist, King's College London, London, England
| | - GW Montgomery
- Genetic Epidemiology Laboratory, Queensland Institute of Medical Research, Brisbane, Australia
| | - NG Martin
- Genetic Epidemiology Laboratory, Queensland Institute of Medical Research, Brisbane, Australia
| | - SE Medland
- Genetic Epidemiology Laboratory, Queensland Institute of Medical Research, Brisbane, Australia
| | - DI Boomsma
- Department of Biological Psychology, VU University Amsterdam, Amsterdam Netherlands
| |
Collapse
|
76
|
The impact of phenotypic and genetic heterogeneity on results of genome wide association studies of complex diseases. PLoS One 2013; 8:e76295. [PMID: 24146854 PMCID: PMC3795757 DOI: 10.1371/journal.pone.0076295] [Citation(s) in RCA: 154] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Accepted: 08/26/2013] [Indexed: 11/19/2022] Open
Abstract
Phenotypic misclassification (between cases) has been shown to reduce the power to detect association in genetic studies. However, it is conceivable that complex traits are heterogeneous with respect to individual genetic susceptibility and disease pathophysiology, and that the effect of heterogeneity has a larger magnitude than the effect of phenotyping errors. Although an intuitively clear concept, the effect of heterogeneity on genetic studies of common diseases has received little attention. Here we investigate the impact of phenotypic and genetic heterogeneity on the statistical power of genome wide association studies (GWAS). We first performed a study of simulated genotypic and phenotypic data. Next, we analyzed the Wellcome Trust Case-Control Consortium (WTCCC) data for diabetes mellitus (DM) type 1 (T1D) and type 2 (T2D), using varying proportions of each type of diabetes in order to examine the impact of heterogeneity on the strength and statistical significance of association previously found in the WTCCC data. In both simulated and real data, heterogeneity (presence of “non-cases”) reduced the statistical power to detect genetic association and greatly decreased the estimates of risk attributed to genetic variation. This finding was also supported by the analysis of loci validated in subsequent large-scale meta-analyses. For example, heterogeneity of 50% increases the required sample size by approximately three times. These results suggest that accurate phenotype delineation may be more important for detecting true genetic associations than increase in sample size.
Collapse
|
77
|
Crosbie J, Arnold P, Paterson A, Swanson J, Dupuis A, Li X, Shan J, Goodale T, Tam C, Strug LJ, Schachar RJ. Response inhibition and ADHD traits: correlates and heritability in a community sample. JOURNAL OF ABNORMAL CHILD PSYCHOLOGY 2013; 41:497-507. [PMID: 23315233 PMCID: PMC3600128 DOI: 10.1007/s10802-012-9693-9] [Citation(s) in RCA: 137] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Endophenotypes or intermediate phenotypes are of great interest in neuropsychiatric genetics because of their potential for facilitating gene discovery. We evaluated response inhibition, latency and variability measures derived from the stop task as endophenotypes of ADHD by testing whether they were related to ADHD traits in the general population, heritable and shared genetic risk with ADHD traits. Participants were 16,099 children and adolescents, ages 6 to 18 years who visited a local science center. We measured ADHD traits using the Strengths and Weaknesses of ADHD-symptoms and Normal-Behavior (SWAN) rating scale and performance on the stop signal task (SST)-response inhibition (SSRT), response latency (GoRT), and response variability (GoRTSD). Regression analysis was used to assess the relationship of cognitive measures and ADHD traits while controlling for family, age, sex, ethnicity, socioeconomic status and treatment status. Heritability of ADHD and cognitive traits was estimated using SOLAR in 7,483 siblings from 3,507 families that included multiple siblings. Bivariate relationships between pairs of variables were examined. Individuals with greater ADHD trait scores had worse response inhibition, slower response latency, and greater variability. Younger participants and girls had inferior performance although the gender effects were minimal and evident in youngest participants. Inhibition, latency, variability, total ADHD traits, inattention and hyperactivity-impulsivity scores were significantly heritable. ADHD traits and inhibition, but not latency or variability were coheritable. In the largest study in the general population, we found support for the validity of response inhibition as an endophenotype of ADHD.
Collapse
Affiliation(s)
- J. Crosbie
- Neurosciences and Mental Health Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
- Department of Psychiatry, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON Canada M5G 1X8
| | - P. Arnold
- Genetics and Genomic Biology Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
- Department of Psychiatry, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON Canada M5G 1X8
| | - A. Paterson
- Genetics and Genomic Biology Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
- Dalla Lana School of Public Health, University of Toronto, Toronto, Canada
| | - J. Swanson
- Department of Pediatrics, School of Medicine, University of California Irvine, Irvine, CA USA
- Department of Psychiatry, Florida International University, University Park, FL USA
- Sackler Institute, Department of Psychiatry, Weill College of Medicine at Cornell University, Ithaca, NY USA
| | - A. Dupuis
- Research Operations, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
- Dalla Lana School of Public Health, University of Toronto, Toronto, Canada
- Child Health Evaluative Sciences, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - X. Li
- Genetics and Genomic Biology Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
- Child Health Evaluative Sciences, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - J. Shan
- Neurosciences and Mental Health Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - T. Goodale
- Neurosciences and Mental Health Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - C. Tam
- Genetics and Genomic Biology Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - L. J. Strug
- Research Operations, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
- Dalla Lana School of Public Health, University of Toronto, Toronto, Canada
- Child Health Evaluative Sciences, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - R. J. Schachar
- Neurosciences and Mental Health Program, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
- Department of Psychiatry, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON Canada M5G 1X8
| |
Collapse
|
78
|
Genome-wide association studies in asthma: what they really told us about pathogenesis. Curr Opin Allergy Clin Immunol 2013; 13:112-8. [PMID: 23222155 DOI: 10.1097/aci.0b013e32835c1674] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE OF REVIEW Over the past years, several consortia have provided a data deluge from large-scale, genome-wide association studies (GWASs) for numerous asthma and allergy related traits. Dozens of reviews have already summarized the main results, although a coherent picture is still missing, referred to as 'missing' or 'unexplained' heritability. RECENT FINDINGS We identify the factors responsible for the unexplained heritability including imprecise phenotyping, biased single-nucleotide polymorphism selection (preferentially gene-based and high allele frequency with poor linkage disequilibrium tagging capacity), heterogeneity and insufficient significance ranking test statistics. In spite of these problems, three major outcomes can already be identified. First, rare variants give the highest risk estimates but are limited to small subgroups indicating a complex origin of asthma that may involve hundreds of variants that are either population, family or individual specific. Second, only a few common variants are shared amongst all asthmatics where the IL33/ST2 pathway turns out to be the most relevant factor. Third, transcription factor binding sites are enriched amongst the top association results pointing towards disturbed regulatory network function in asthma. SUMMARY The next wave of asthma genetic studies will use full-genome sequencing and overcome most GWAS-associated problems. It will be the last step of a century-long search for asthma genes, satisfying scientific curiosity and, hopefully, also providing data applicable in translational medicine.
Collapse
|
79
|
Mitjans M, Serretti A, Fabbri C, Gastó C, Catalán R, Fañanás L, Arias B. Screening genetic variability at the CNR1 gene in both major depression etiology and clinical response to citalopram treatment. Psychopharmacology (Berl) 2013; 227:509-19. [PMID: 23407780 DOI: 10.1007/s00213-013-2995-y] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Accepted: 01/08/2013] [Indexed: 11/30/2022]
Abstract
RATIONALE The endocannabinoid system has been implicated in the pathogenesis of major depression (MD) as well as in the mediation of antidepressant drug effects. OBJECTIVES To analyze CNR1 gene variants in MD and clinical response to citalopram (selective serotonin re-uptake inhibitors [SSRI]). METHODS The role of CNR1 gene (rs806368, rs1049353, rs806371, rs806377 and rs1535255) was investigated in 319 outpatients with MD and 150 healthy individuals. A subsample of 155 depressive patients were treated with citalopram and evaluated for response (fourth week) and remission (12th week) by the 21-item Hamilton Depression Rating Scale (HDRS). RESULTS We observed a higher frequency of rs806371 G carriers in MD patients with both presence of melancholia (p = 0.018) and psychotic symptoms (p = 0.007) than in controls. Haplotype frequency distributions between MD sample and controls showed a significant difference for Block 1 (rs806368-rs1049353-rs806371) (p = 0.008). This haplotype finding was consistent when we compared controls with MD subsample stratified by melancholia (p = 0.0009) and psychotic symptoms (p = 0.014). The TT homozygous of the rs806368 and rs806371 presented more risk of no Remission than the C carriers (p = 0.008 and 0.012, respectively). Haplotype frequency distributions according to Remission status showed a significant difference for Block 1 (p = 0.032). Also, we observed significant effect of time-sex-genotype interaction for the rs806368, showing that the C carrier men presented a better response to antidepressant treatment throughout the follow-up than TT homozygous men and women group (p = 0.026). CONCLUSIONS These results suggest an effect of CNR1 gene in the etiology of MD and clinical response to citalopram.
Collapse
Affiliation(s)
- Marina Mitjans
- Unitat d'Antropologia, Departament de Biologia Animal, Facultat de Biologia, Universitat de Barcelona/Institut de Biomedicina de la Universitat de Barcelona (IBUB), Av. Diagonal, 643 2on pis, 08028 Barcelona, Spain
| | | | | | | | | | | | | |
Collapse
|
80
|
Gourraud PA, Sdika M, Khankhanian P, Henry RG, Beheshtian A, Matthews PM, Hauser SL, Oksenberg JR, Pelletier D, Baranzini SE. A genome-wide association study of brain lesion distribution in multiple sclerosis. ACTA ACUST UNITED AC 2013; 136:1012-24. [PMID: 23412934 DOI: 10.1093/brain/aws363] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Brain magnetic resonance imaging is widely used as a diagnostic and monitoring tool in multiple sclerosis and provides a non-invasive, sensitive and reproducible way to track the disease. Topological characteristics relating to the distribution and shape of lesions are recognized as important neuroradiological markers in the diagnosis of multiple sclerosis, although these have been much less well characterized quantitatively than have traditional measures such as T2 hyperintense or T1 hypointense lesion volumes. Here, we used voxel-level 3 T magnetic resonance imaging T1-weighted scans to reconstruct the 3D topology of lesions in 284 subjects with multiple sclerosis and tested whether this is a heritable phenotype. To this end, we extracted the genotypes from a published genome-wide association study on these same individuals and searched for genetic associations with lesion load, shape and topological distribution. Lesion probability maps were created to identify frequently affected areas and to assess the overall distribution of T1 lesions in the subject population as a whole. We then developed an original algorithm to cluster adjacent lesional voxels (cluxels) in each subject and tested whether cluxel topology was significantly associated with any single-nucleotide polymorphism in our data set. To focus on patterns of lesion distribution, we computed the first 10 principal components. Although principal component 1 correlated with lesion load, none of the remaining orthogonal components correlated with any other known variable. We then conducted genome-wide association studies on each of these and found 31 significant associations (false discovery rate <0.01) with principal component 8, which represents a mode of variation of lesion topology in the population. The majority of the loci can be linked to genes related to immune cell function and to myelin and neural growth; some (SYK, MYT1L, TRAPPC9, SLITKR6 and RIC3) have been previously associated with the distribution of white matter lesions in multiple sclerosis. Finally, we used a bioinformatics approach to identify a network of 48 interacting proteins showing genetic associations (P < 0.01) with cluxel topology in multiple sclerosis. This network also contains proteins expressed in immune cells and is enriched in molecules expressed in the central nervous system that contribute to neural development and regeneration. Our results show how quantitative traits derived from brain magnetic resonance images of patients with multiple sclerosis can be used as dependent variables in a genome-wide association study. With the widespread availability of powerful computing and the availability of genotyped populations, integration of imaging and genetic data sets is likely to become a mainstream tool for understanding the complex biological processes of multiple sclerosis and other brain disorders.
Collapse
Affiliation(s)
- Pierre-Antoine Gourraud
- Department of Neurology, School of Medicine, University of California, San Francisco, 675 Nelson Rising Lane, Suite 215, San Francisco, CA 94158, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
81
|
Gaysina D, Xu MK, Barnett JH, Croudace TJ, Wong A, Richards M, Jones PB. The catechol-O-methyltransferase gene (COMT) and cognitive function from childhood through adolescence. Biol Psychol 2013; 92:359-64. [PMID: 23178897 PMCID: PMC3580283 DOI: 10.1016/j.biopsycho.2012.11.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 11/12/2012] [Accepted: 11/13/2012] [Indexed: 11/29/2022]
Abstract
Genetic variation in the catechol-O-methyltransferase gene (COMT) can influence cognitive function, and this effect may depend on developmental stage. Using a large representative British birth cohort, we investigated the effect of COMT on cognitive function (verbal and non-verbal) at ages 8 and 15 years taking into account the possible modifying effect of pubertal stage. Five functional COMT polymorphisms, rs6269, rs4818, rs4680, rs737865 and rs165599 were analysed. Associations between COMT polymorphisms and cognition were tested using regression and latent variable structural equation modelling (SEM). Before correction for multiple testing, COMT rs737865 showed association with reading comprehension, verbal ability and global cognition at age 15 years in pubescent boys only. Although there was some evidence for age- and sex-specific effects of the COMT rs737865 none remained significant after correction for multiple testing. Further studies are necessary in order to make firmer conclusions.
Collapse
Affiliation(s)
- Darya Gaysina
- MRC Unit for Lifelong Health and Ageing, University College London, London, UK.
| | | | | | | | | | | | | |
Collapse
|
82
|
van der Sluis S, Posthuma D, Dolan CV. TATES: efficient multivariate genotype-phenotype analysis for genome-wide association studies. PLoS Genet 2013; 9:e1003235. [PMID: 23359524 PMCID: PMC3554627 DOI: 10.1371/journal.pgen.1003235] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 11/26/2012] [Indexed: 11/19/2022] Open
Abstract
To date, the genome-wide association study (GWAS) is the primary tool to identify genetic variants that cause phenotypic variation. As GWAS analyses are generally univariate in nature, multivariate phenotypic information is usually reduced to a single composite score. This practice often results in loss of statistical power to detect causal variants. Multivariate genotype–phenotype methods do exist but attain maximal power only in special circumstances. Here, we present a new multivariate method that we refer to as TATES (Trait-based Association Test that uses Extended Simes procedure), inspired by the GATES procedure proposed by Li et al (2011). For each component of a multivariate trait, TATES combines p-values obtained in standard univariate GWAS to acquire one trait-based p-value, while correcting for correlations between components. Extensive simulations, probing a wide variety of genotype–phenotype models, show that TATES's false positive rate is correct, and that TATES's statistical power to detect causal variants explaining 0.5% of the variance can be 2.5–9 times higher than the power of univariate tests based on composite scores and 1.5–2 times higher than the power of the standard MANOVA. Unlike other multivariate methods, TATES detects both genetic variants that are common to multiple phenotypes and genetic variants that are specific to a single phenotype, i.e. TATES provides a more complete view of the genetic architecture of complex traits. As the actual causal genotype–phenotype model is usually unknown and probably phenotypically and genetically complex, TATES, available as an open source program, constitutes a powerful new multivariate strategy that allows researchers to identify novel causal variants, while the complexity of traits is no longer a limiting factor. The genome-wide association study (GWAS) is the primary tool to identify genetic variants that cause phenotypic variation. As GWAS methods are generally univariate in nature, multivariate phenotypic information is usually reduced to a single composite score, which frequently results in a considerable loss of statistical power to detect causal variants. Multivariate genotype–phenotype methods do exist but attain maximal power only in special circumstances. We present a new multivariate method called TATES (Trait-based Association Test that uses Extended Simes procedure). Extensive simulations show that TATES's false positive rate is correct, and that TATES's statistical power to detect causal variants explaining 0.5% of the variance can be 2.5–9 times higher than the power of univariate tests of composite scores and 1.5–2 times higher than the power of the standard MANOVA. Unlike other multivariate methods, TATES uncovers both genetic variants that are common to multiple phenotypes as well as phenotype specific variants. TATES thus provides a more complete view of the genetic architecture of complex traits and constitutes a powerful new multivariate strategy that allows researchers to identify novel causal variants.
Collapse
Affiliation(s)
- Sophie van der Sluis
- Department of Functional Genomics and Department of Clinical Genetics, VU Medical Center, Amsterdam, The Netherlands.
| | | | | |
Collapse
|
83
|
van der Sluis S, Posthuma D, Nivard MG, Verhage M, Dolan CV. Power in GWAS: lifting the curse of the clinical cut-off. Mol Psychiatry 2013; 18:2-3. [PMID: 22614290 DOI: 10.1038/mp.2012.65] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
84
|
van den Berg SM, Service SK. Power of IRT in GWAS: successful QTL mapping of sum score phenotypes depends on interplay between risk allele frequency, variance explained by the risk allele, and test characteristics. Genet Epidemiol 2012; 36:882-9. [PMID: 22965845 DOI: 10.1002/gepi.21680] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 07/13/2012] [Accepted: 08/03/2012] [Indexed: 12/16/2022]
Abstract
As data from sequencing studies in humans accumulate, rare genetic variants influencing liability to disease and disorders are expected to be identified. Three simulation studies show that characteristics and properties of diagnostic instruments interact with risk allele frequency to affect the power to detect a quantitative trait locus (QTL) based on a test score derived from symptom counts or questionnaire items. Clinical tests, that is, tests that show a positively skewed phenotypic sum score distribution in the general population, are optimal to find rare risk alleles of large effect. Tests that show a negatively skewed sum score distribution are optimal to find rare protective alleles of large effect. For alleles of small effect, tests with normally distributed item parameters give best power for a wide range of allele frequencies. The item-response theory framework can help understand why an existing measurement instrument has more power to detect risk alleles with either low or high frequency, or both kinds.
Collapse
Affiliation(s)
- Stéphanie M van den Berg
- Department of Research Methodology, Measurement and Data Analysis, University of Twente, The Netherlands
| | | |
Collapse
|
85
|
van Veen T, Goeman JJ, Monajemi R, Wardenaar KJ, Hartman CA, Snieder H, Nolte IM, Penninx BWJH, Zitman FG. Different gene sets contribute to different symptom dimensions of depression and anxiety. Am J Med Genet B Neuropsychiatr Genet 2012; 159B:519-28. [PMID: 22573416 DOI: 10.1002/ajmg.b.32058] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 04/19/2012] [Indexed: 01/09/2023]
Abstract
Although many genetic association studies have been carried out, it remains unclear which genes contribute to depression. This may be due to heterogeneity of the DSM-IV category of depression. Specific symptom-dimensions provide a more homogenous phenotype. Furthermore, as effects of individual genes are small, analysis of genetic data at the pathway-level provides more power to detect associations and yield valuable biological insight. In 1,398 individuals with a Major Depressive Disorder, the symptom dimensions of the tripartite model of anxiety and depression, General Distress, Anhedonic Depression, and Anxious Arousal, were measured with the Mood and Anxiety Symptoms Questionnaire (30-item Dutch adaptation; MASQ-D30). Association of these symptom dimensions with candidate gene sets and gene sets from two public pathway databases was tested using the Global test. One pathway was associated with General Distress, and concerned molecules expressed in the endoplasmatic reticulum lumen. Seven pathways were associated with Anhedonic Depression. Important themes were neurodevelopment, neurodegeneration, and cytoskeleton. Furthermore, three gene sets associated with Anxious Arousal regarded development, morphology, and genetic recombination. The individual pathways explained up to 1.7% of the variance. These data demonstrate mechanisms that influence the specific dimensions. Moreover, they show the value of using dimensional phenotypes on one hand and gene sets on the other hand.
Collapse
Affiliation(s)
- Tineke van Veen
- Department of Psychiatry, Leiden University Medical Centre, Leiden, The Netherlands.
| | | | | | | | | | | | | | | | | |
Collapse
|
86
|
Cramer AOJ, Van Der Sluis S, Noordhof A, Wichers M, Geschwind N, Aggen SH, Kendler KS, Borsboom D. Dimensions of Normal Personality as Networks in Search of Equilibrium: You Can't like Parties if you Don't like People. EUROPEAN JOURNAL OF PERSONALITY 2012. [DOI: 10.1002/per.1866] [Citation(s) in RCA: 234] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In one currently dominant view on personality, personality dimensions (e.g. extraversion) are causes of human behaviour, and personality inventory items (e.g. ‘I like to go to parties’ and ‘I like people’) are measurements of these dimensions. In this view, responses to extraversion items correlate because they measure the same latent dimension. In this paper, we challenge this way of thinking and offer an alternative perspective on personality as a system of connected affective, cognitive and behavioural components. We hypothesize that these components do not hang together because they measure the same underlying dimension; they do so because they depend on one another directly for causal, homeostatic or logical reasons (e.g. if one does not like people and it is harder to enjoy parties). From this ‘network perspective’, personality dimensions emerge out of the connectivity structure that exists between the various components of personality. After outlining the network theory, we illustrate how it applies to personality research in four domains: (i) the overall organization of personality components; (ii) the distinction between state and trait; (iii) the genetic architecture of personality; and (iv) the relation between personality and psychopathology. Copyright © 2012 John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
| | - Sophie Van Der Sluis
- Department of Psychology, University of Amsterdam, The Netherlands
- Complex Trait Genetics, Department of Functional Genomics and Department Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), FALW-VUA, Neuroscience Campus Amsterdam, VU University Medical Center (VUmc), The Netherlands
| | - Arjen Noordhof
- Department of Psychology, University of Amsterdam, The Netherlands
| | - Marieke Wichers
- European Graduate School for Neuroscience, SEARCH, Department of Psychiatry and Psychology, Maastricht University Medical Centre, The Netherlands
| | - Nicole Geschwind
- European Graduate School for Neuroscience, SEARCH, Department of Psychiatry and Psychology, Maastricht University Medical Centre, The Netherlands
- Research Group on Health Psychology, Centre for the Psychology of Learning and Experimental Psychopathology, University of Leuven, Belgium
| | - Steven H. Aggen
- Virginia Institute for Psychiatric and Behavioral Genetics, USA
- Department of Psychiatry, Virginia Commonwealth University, USA
| | - Kenneth S. Kendler
- Virginia Institute for Psychiatric and Behavioral Genetics, USA
- Department of Psychiatry, Virginia Commonwealth University, USA
| | - Denny Borsboom
- Department of Psychology, University of Amsterdam, The Netherlands
| |
Collapse
|
87
|
Vinkhuyzen AAE, Pedersen NL, Yang J, Lee SH, Magnusson PKE, Iacono WG, McGue M, Madden PAF, Heath AC, Luciano M, Payton A, Horan M, Ollier W, Pendleton N, Deary IJ, Montgomery GW, Martin NG, Visscher PM, Wray NR. Common SNPs explain some of the variation in the personality dimensions of neuroticism and extraversion. Transl Psychiatry 2012; 2:e102. [PMID: 22832902 PMCID: PMC3337075 DOI: 10.1038/tp.2012.27] [Citation(s) in RCA: 146] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The personality traits of neuroticism and extraversion are predictive of a number of social and behavioural outcomes and psychiatric disorders. Twin and family studies have reported moderate heritability estimates for both traits. Few associations have been reported between genetic variants and neuroticism/extraversion, but hardly any have been replicated. Moreover, the ones that have been replicated explain only a small proportion of the heritability (<~2%). Using genome-wide single-nucleotide polymorphism (SNP) data from ~12,000 unrelated individuals we estimated the proportion of phenotypic variance explained by variants in linkage disequilibrium with common SNPs as 0.06 (s.e. = 0.03) for neuroticism and 0.12 (s.e. = 0.03) for extraversion. In an additional series of analyses in a family-based sample, we show that while for both traits ~45% of the phenotypic variance can be explained by pedigree data (that is, expected genetic similarity) one third of this can be explained by SNP data (that is, realized genetic similarity). A part of the so-called 'missing heritability' has now been accounted for, but some of the reported heritability is still unexplained. Possible explanations for the remaining missing heritability are that: (i) rare variants that are not captured by common SNPs on current genotype platforms make a major contribution; and/ or (ii) the estimates of narrow sense heritability from twin and family studies are biased upwards, for example, by not properly accounting for nonadditive genetic factors and/or (common) environmental factors.
Collapse
Affiliation(s)
- A A E Vinkhuyzen
- Queensland Institute of Medical Research, Brisbane, Queensland, Australia.
| | - N L Pedersen
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - J Yang
- Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - S H Lee
- Queensland Institute of Medical Research, Brisbane, Queensland, Australia,The University of Queensland, Queensland Brain Institute, Brisbane, Queensland, Australia
| | - P K E Magnusson
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - W G Iacono
- Department of Psychology, University of Minnesota, Minneapolis, MN, USA
| | - M McGue
- Department of Psychology, University of Minnesota, Minneapolis, MN, USA
| | - P A F Madden
- Washington University School of Medicine, St Louis, MO, USA
| | - A C Heath
- Washington University School of Medicine, St Louis, MO, USA
| | - M Luciano
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK
| | - A Payton
- Medical Genetics Section, University of Edinburgh Molecular Medicine Centre, Institute of Genetics and Molecular Medicine, Western General Hospital, Edinburgh, UK
| | - M Horan
- School of Medicine, The University of Manchester, Manchester, UK
| | - W Ollier
- Medical Genetics Section, University of Edinburgh Molecular Medicine Centre, Institute of Genetics and Molecular Medicine, Western General Hospital, Edinburgh, UK
| | - N Pendleton
- School of Medicine, The University of Manchester, Manchester, UK
| | - I J Deary
- Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, Edinburgh, UK
| | - G W Montgomery
- Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - N G Martin
- Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - P M Visscher
- Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - N R Wray
- Queensland Institute of Medical Research, Brisbane, Queensland, Australia,The University of Queensland, Queensland Brain Institute, Brisbane, Queensland, Australia
| |
Collapse
|
88
|
OKA A, MABUCHI T, OZAWA A, INOKO H. Current understanding of human genetics and genetic analysis of psoriasis. J Dermatol 2012; 39:231-41. [DOI: 10.1111/j.1346-8138.2012.01504.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
89
|
Knopik VS. Grand challenge in behavioral and psychiatric genetics: quantitative challenges to keeping up with molecular advances. Front Genet 2012; 2:9. [PMID: 22303308 PMCID: PMC3268568 DOI: 10.3389/fgene.2011.00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Accepted: 02/17/2011] [Indexed: 11/13/2022] Open
Affiliation(s)
- Valerie S Knopik
- Division of Behavioral Genetics, Department of Psychiatry, Rhode Island Hospital Providence, RI, USA
| |
Collapse
|
90
|
Abstract
Type 2 Diabetes Mellitus (T2DM) is a metabolic disorder influenced by interactions between genetic and environmental factors. Epigenetics conveys specific environmental influences into phenotypic traits through a variety of mechanisms that are often installed in early life, then persist in differentiated tissues with the power to modulate the expression of many genes, although undergoing time-dependent alterations. There is still no evidence that epigenetics contributes significantly to the causes or transmission of T2DM from one generation to another, thus, to the current environment-driven epidemics, but it has become so likely, as pointed out in this paper, that one can expect an efflorescence of epigenetic knowledge about T2DM in times to come.
Collapse
|
91
|
Impact of changing drug treatment and malaria endemicity on the heritability of malaria phenotypes in a longitudinal family-based cohort study. PLoS One 2011; 6:e26364. [PMID: 22073159 PMCID: PMC3207815 DOI: 10.1371/journal.pone.0026364] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Accepted: 09/25/2011] [Indexed: 11/20/2022] Open
Abstract
Despite considerable success of genome wide association (GWA) studies in identifying causal variants for many human diseases, their success in unraveling the genetic basis to complex diseases has been more mitigated. Pathogen population structure may impact upon the infectious phenotype, especially with the intense short-term selective pressure that drug treatment exerts on pathogens. Rigorous analysis that accounts for repeated measures and disentangles the influence of genetic and environmental factors must be performed. Attempts should be made to consider whether pathogen diversity will impact upon host genetic responses to infection.We analyzed the heritability of two Plasmodium falciparum phenotypes, the number of clinical malaria episodes (PFA) and the proportion of these episodes positive for gametocytes (Pfgam), in a family-based cohort followed for 19 years, during which time there were four successive drug treatment regimes, with documented appearance of drug resistance. Repeated measures and variance components analyses were performed with fixed environmental, additive genetic, intra-individual and maternal effects for each drug period. Whilst there was a significant additive genetic effect underlying PFA during the first drug period of study, this was lost in subsequent periods. There was no additive genetic effect for Pfgam. The intra-individual effect increased significantly in the chloroquine period.The loss of an additive genetic effect following novel drug treatment may result in significant loss of power to detect genes in a GWA study. Prior genetic analysis must be a pre-requisite for more detailed GWA studies. The temporal changes in the individual genetic and the intra-individual estimates are consistent with those expected if there were specific host-parasite interactions. The complex basis to the human response to malaria parasite infection likely includes dominance/epistatic genetic effects encompassed within the intra-individual variance component. Evaluating their role in influencing the outcome of infection through host genotype by parasite genotype interactions warrants research effort.
Collapse
|
92
|
Feldkamp ML, Carey JC, Pimentel R, Krikov S, Botto LD. Is gastroschisis truly a sporadic defect? Familial cases of gastroschisis in Utah, 1997 to 2008. ACTA ACUST UNITED AC 2011; 91:873-8. [DOI: 10.1002/bdra.22844] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 06/03/2011] [Accepted: 06/07/2011] [Indexed: 11/07/2022]
|
93
|
Abstract
Asthma and allergy are common conditions with complex etiologies involving both genetic and environmental contributions. Recent genome-wide association studies (GWAS) and meta-analyses of GWAS have begun to shed light on both common and distinct pathways that contribute to asthma and allergic diseases. Associations with variation in genes encoding the epithelial cell-derived cytokines, interleukin-33 (IL-33) and thymic stromal lymphopoietin (TSLP), and the IL1RL1 gene encoding the IL-33 receptor, ST2, highlight the central roles for innate immune response pathways that promote the activation and differentiation of T-helper 2 cells in the pathogenesis of both asthma and allergic diseases. In contrast, variation at the 17q21 asthma locus, encoding the ORMDL3 and GSDML genes, is specifically associated with risk for childhood onset asthma. These and other genetic findings are providing a list of well-validated asthma and allergy susceptibility genes that are expanding our understanding of the common and unique biological pathways that are dysregulated in these related conditions. Ongoing studies will continue to broaden our understanding of asthma and allergy and unravel the mechanisms for the development of these complex traits.
Collapse
Affiliation(s)
- Carole Ober
- Department of Human Genetics, The University of Chicago, Chicago, IL 60637, USA.
| | | |
Collapse
|