7 recherche sur le mot-clé 'twin studies'

Commentary: The strength of multivariate twin studies: testing for shared and distinctive aetiology among different sets of behavioural traits – reflections on Lewis et al. (2014) / Dorret I. BOOMSMA in Journal of Child Psychology and Psychiatry, 55-8 (August 2014)  

Public ISBD [article]  inJournal of Child Psychology and Psychiatry > 55-8 (August 2014) . - p.876-877 Titre : Commentary: The strength of multivariate twin studies: testing for shared and distinctive aetiology among different sets of behavioural traits – reflections on Lewis et al. (2014) Type de document : Texte imprimé et/ou numérique Auteurs : Dorret I. BOOMSMA, Auteur Article en page(s) : p.876-877 Langues : Anglais (eng) Mots-clés : Adolescent behavioural problems  twin studies  multivariate traits  etiology  genetic pleiotropy Index. décimale : PER Périodiques Résumé : This contribution discusses the article by Lewis et al. on the relationship between variation in normal personality and adolescent behavioural problems and puts the study into the perspective of the value of twin studies of multivariate behavioural traits, which enable the analyses of genetic pleiotropy and causality. En ligne : http://dx.doi.org/10.1111/jcpp.12292 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=237 [article] Commentary: The strength of multivariate twin studies: testing for shared and distinctive aetiology among different sets of behavioural traits – reflections on Lewis et al. (2014) [Texte imprimé et/ou numérique] / Dorret I. BOOMSMA, Auteur . - p.876-877. Langues : Anglais (eng) in Journal of Child Psychology and Psychiatry > 55-8 (August 2014) . - p.876-877 Mots-clés : Adolescent behavioural problems  twin studies  multivariate traits  etiology  genetic pleiotropy Index. décimale : PER Périodiques Résumé : This contribution discusses the article by Lewis et al. on the relationship between variation in normal personality and adolescent behavioural problems and puts the study into the perspective of the value of twin studies of multivariate behavioural traits, which enable the analyses of genetic pleiotropy and causality. En ligne : http://dx.doi.org/10.1111/jcpp.12292 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=237

Heritability of autism spectrum disorders: a meta-analysis of twin studies / Beata TICK in Journal of Child Psychology and Psychiatry, 57-5 (May 2016)  

Public ISBD [article]  inJournal of Child Psychology and Psychiatry > 57-5 (May 2016) . - p.585-595 Titre : Heritability of autism spectrum disorders: a meta-analysis of twin studies Type de document : Texte imprimé et/ou numérique Auteurs : Beata TICK, Auteur ; Patrick BOLTON, Auteur ; Francesca HAPPE, Auteur ; Michael RUTTER, Auteur ; Frühling V. RIJSDIJK, Auteur Article en page(s) : p.585-595 Langues : Anglais (eng) Mots-clés : Autism spectrum disorders  meta-analysis  heritability  twin studies  DF extremes analysis Index. décimale : PER Périodiques Résumé : Background The etiology of Autism Spectrum Disorder (ASD) has been recently debated due to emerging findings on the importance of shared environmental influences. However, two recent twin studies do not support this and instead re-affirm strong genetic effects on the liability to ASD, a finding consistent with previous reports. This study conducts a systematic review and meta-analysis of all twin studies of ASD published to date and explores the etiology along the continuum of a quantitative measure of ASD. Methods A PubMed Central, Science Direct, Google Scholar, Web of Knowledge structured search conducted online, to identify all twin studies on ASD published to date. Thirteen primary twin studies were identified, seven were included in the meta-analysis by meeting Systematic Recruitment criterion; correction for selection and ascertainment strategies, and applied prevalences were assessed for these studies. In addition, a quantile DF extremes analysis was carried out on Childhood Autism Spectrum Test scores measured in a population sample of 6,413 twin pairs including affected twins. Results The meta-analysis correlations for monozygotic twins (MZ) were almost perfect at .98 (95% Confidence Interval, .96–.99). The dizygotic (DZ) correlation, however, was .53 (95% CI .44–.60) when ASD prevalence rate was set at 5% (in line with the Broad Phenotype of ASD) and increased to .67 (95% CI .61–.72) when applying a prevalence rate of 1%. The meta-analytic heritability estimates were substantial: 64–91%. Shared environmental effects became significant as the prevalence rate decreased from 5–1%: 07–35%. The DF analyses show that for the most part, there is no departure from linearity in heritability. Conclusions We demonstrate that: (a) ASD is due to strong genetic effects; (b) shared environmental effects become significant as a function of lower prevalence rate; (c) previously reported significant shared environmental influences are likely a statistical artefact of overinclusion of concordant DZ twins. En ligne : http://dx.doi.org/10.1111/jcpp.12499 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=288 [article] Heritability of autism spectrum disorders: a meta-analysis of twin studies [Texte imprimé et/ou numérique] / Beata TICK, Auteur ; Patrick BOLTON, Auteur ; Francesca HAPPE, Auteur ; Michael RUTTER, Auteur ; Frühling V. RIJSDIJK, Auteur . - p.585-595. Langues : Anglais (eng) in Journal of Child Psychology and Psychiatry > 57-5 (May 2016) . - p.585-595 Mots-clés : Autism spectrum disorders  meta-analysis  heritability  twin studies  DF extremes analysis Index. décimale : PER Périodiques Résumé : Background The etiology of Autism Spectrum Disorder (ASD) has been recently debated due to emerging findings on the importance of shared environmental influences. However, two recent twin studies do not support this and instead re-affirm strong genetic effects on the liability to ASD, a finding consistent with previous reports. This study conducts a systematic review and meta-analysis of all twin studies of ASD published to date and explores the etiology along the continuum of a quantitative measure of ASD. Methods A PubMed Central, Science Direct, Google Scholar, Web of Knowledge structured search conducted online, to identify all twin studies on ASD published to date. Thirteen primary twin studies were identified, seven were included in the meta-analysis by meeting Systematic Recruitment criterion; correction for selection and ascertainment strategies, and applied prevalences were assessed for these studies. In addition, a quantile DF extremes analysis was carried out on Childhood Autism Spectrum Test scores measured in a population sample of 6,413 twin pairs including affected twins. Results The meta-analysis correlations for monozygotic twins (MZ) were almost perfect at .98 (95% Confidence Interval, .96–.99). The dizygotic (DZ) correlation, however, was .53 (95% CI .44–.60) when ASD prevalence rate was set at 5% (in line with the Broad Phenotype of ASD) and increased to .67 (95% CI .61–.72) when applying a prevalence rate of 1%. The meta-analytic heritability estimates were substantial: 64–91%. Shared environmental effects became significant as the prevalence rate decreased from 5–1%: 07–35%. The DF analyses show that for the most part, there is no departure from linearity in heritability. Conclusions We demonstrate that: (a) ASD is due to strong genetic effects; (b) shared environmental effects become significant as a function of lower prevalence rate; (c) previously reported significant shared environmental influences are likely a statistical artefact of overinclusion of concordant DZ twins. En ligne : http://dx.doi.org/10.1111/jcpp.12499 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=288

Chaotic homes and school achievement: a twin study / Ken B. HANSCOMBE in Journal of Child Psychology and Psychiatry, 52-11 (November 2011)  

Public ISBD [article]  inJournal of Child Psychology and Psychiatry > 52-11 (November 2011) . - p.1212-1220 Titre : Chaotic homes and school achievement: a twin study Type de document : Texte imprimé et/ou numérique Auteurs : Ken B. HANSCOMBE, Auteur ; Claire Margaret Alison HAWORTH, Auteur ; Oliver S.P. DAVIS, Auteur ; Sara R. JAFFEE, Auteur ; Robert PLOMIN, Auteur Année de publication : 2011 Article en page(s) : p.1212-1220 Langues : Anglais (eng) Mots-clés : Gene–environment correlation  household chaos  environmental confusion  home environment  school achievement  twin studies  behavioural genetics Index. décimale : PER Périodiques Résumé : Background:  Chaotic homes predict poor school performance. Given that it is known that genes affect both children’s experience of household chaos and their school achievement, to what extent is the relationship between high levels of noise and environmental confusion in the home, and children’s school performance, mediated by heritable child effects? This is the first study to explore the genetic and environmental pathways between household chaos and academic performance. Method:  Children’s perceptions of family chaos at ages 9 and 12 and their school performance at age 12 were assessed in more than 2,300 twin pairs. The use of child-specific measures in a multivariate genetic analysis made it possible to investigate the genetic and environmental origins of the covariation between children’s experience of chaos in the home and their school achievement. Results:  Children’s experience of family chaos and their school achievement were significantly correlated in the expected negative direction (r = −.26). As expected, shared environmental factors explained a large proportion (63%) of the association. However, genetic factors accounted for a significant proportion (37%) of the association between children’s experience of household chaos and their school performance. Conclusions:  The association between chaotic homes and poor performance in school, previously assumed to be entirely environmental in origin, is in fact partly genetic. How children’s home environment affects their academic achievement is not simply in the direction environment → child → outcome. Instead, genetic factors that influence children’s experience of the disordered home environment also affect how well they do at school. The relationship between the child, their environment and their performance at school is complex: both genetic and environmental factors play a role. En ligne : http://dx.doi.org/10.1111/j.1469-7610.2011.02421.x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=145 [article] Chaotic homes and school achievement: a twin study [Texte imprimé et/ou numérique] / Ken B. HANSCOMBE, Auteur ; Claire Margaret Alison HAWORTH, Auteur ; Oliver S.P. DAVIS, Auteur ; Sara R. JAFFEE, Auteur ; Robert PLOMIN, Auteur . - 2011 . - p.1212-1220. Langues : Anglais (eng) in Journal of Child Psychology and Psychiatry > 52-11 (November 2011) . - p.1212-1220 Mots-clés : Gene–environment correlation  household chaos  environmental confusion  home environment  school achievement  twin studies  behavioural genetics Index. décimale : PER Périodiques Résumé : Background:  Chaotic homes predict poor school performance. Given that it is known that genes affect both children’s experience of household chaos and their school achievement, to what extent is the relationship between high levels of noise and environmental confusion in the home, and children’s school performance, mediated by heritable child effects? This is the first study to explore the genetic and environmental pathways between household chaos and academic performance. Method:  Children’s perceptions of family chaos at ages 9 and 12 and their school performance at age 12 were assessed in more than 2,300 twin pairs. The use of child-specific measures in a multivariate genetic analysis made it possible to investigate the genetic and environmental origins of the covariation between children’s experience of chaos in the home and their school achievement. Results:  Children’s experience of family chaos and their school achievement were significantly correlated in the expected negative direction (r = −.26). As expected, shared environmental factors explained a large proportion (63%) of the association. However, genetic factors accounted for a significant proportion (37%) of the association between children’s experience of household chaos and their school performance. Conclusions:  The association between chaotic homes and poor performance in school, previously assumed to be entirely environmental in origin, is in fact partly genetic. How children’s home environment affects their academic achievement is not simply in the direction environment → child → outcome. Instead, genetic factors that influence children’s experience of the disordered home environment also affect how well they do at school. The relationship between the child, their environment and their performance at school is complex: both genetic and environmental factors play a role. En ligne : http://dx.doi.org/10.1111/j.1469-7610.2011.02421.x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=145

Early warm-rewarding parenting moderates the genetic contributions to callous-unemotional traits in childhood / J. HENRY in Journal of Child Psychology and Psychiatry, 59-12 (December 2018)  

Public ISBD [article]  inJournal of Child Psychology and Psychiatry > 59-12 (December 2018) . - p.1282-1288 Titre : Early warm-rewarding parenting moderates the genetic contributions to callous-unemotional traits in childhood Type de document : Texte imprimé et/ou numérique Auteurs : J. HENRY, Auteur ; G. DIONNE, Auteur ; E. VIDING, Auteur ; F. VITARO, Auteur ; M. BRENDGEN, Auteur ; R. E. TREMBLAY, Auteur ; Michel BOIVIN, Auteur Article en page(s) : p.1282-1288 Langues : Anglais (eng) Mots-clés : Callous-unemotional traits  gene-environment interaction  twin studies  warm/rewarding parenting Index. décimale : PER Périodiques Résumé : BACKGROUND: Previous gene-environment interaction studies of CU traits have relied on the candidate gene approach, which does not account for the entire genetic load of complex phenotypes. Moreover, these studies have not examined the role of positive environmental factors such as warm/rewarding parenting. The aim of the present study was to determine whether early warm/rewarding parenting moderates the genetic contributions (i.e., heritability) to callous-unemotional (CU) traits at school age. METHODS: Data were collected in a population sample of 662 twin pairs (Quebec Newborn Twin Study - QNTS). Mothers reported on their warm/rewarding parenting. Teachers assessed children's CU traits. These reports were subjected to twin modeling. RESULTS: Callous-unemotional traits were highly heritable, with the remaining variance accounted for by nonshared environmental factors. Warm/rewarding parenting significantly moderated the role of genes in CU traits; heritability was lower when children received high warm/rewarding parenting than when they were exposed to low warm/rewarding parenting. CONCLUSIONS: High warm/rewarding parenting may partly impede the genetic expression of CU traits. Developmental models of CU traits need to account for such gene-environment processes. En ligne : http://dx.doi.org/10.1111/jcpp.12918 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=371 [article] Early warm-rewarding parenting moderates the genetic contributions to callous-unemotional traits in childhood [Texte imprimé et/ou numérique] / J. HENRY, Auteur ; G. DIONNE, Auteur ; E. VIDING, Auteur ; F. VITARO, Auteur ; M. BRENDGEN, Auteur ; R. E. TREMBLAY, Auteur ; Michel BOIVIN, Auteur . - p.1282-1288. Langues : Anglais (eng) in Journal of Child Psychology and Psychiatry > 59-12 (December 2018) . - p.1282-1288 Mots-clés : Callous-unemotional traits  gene-environment interaction  twin studies  warm/rewarding parenting Index. décimale : PER Périodiques Résumé : BACKGROUND: Previous gene-environment interaction studies of CU traits have relied on the candidate gene approach, which does not account for the entire genetic load of complex phenotypes. Moreover, these studies have not examined the role of positive environmental factors such as warm/rewarding parenting. The aim of the present study was to determine whether early warm/rewarding parenting moderates the genetic contributions (i.e., heritability) to callous-unemotional (CU) traits at school age. METHODS: Data were collected in a population sample of 662 twin pairs (Quebec Newborn Twin Study - QNTS). Mothers reported on their warm/rewarding parenting. Teachers assessed children's CU traits. These reports were subjected to twin modeling. RESULTS: Callous-unemotional traits were highly heritable, with the remaining variance accounted for by nonshared environmental factors. Warm/rewarding parenting significantly moderated the role of genes in CU traits; heritability was lower when children received high warm/rewarding parenting than when they were exposed to low warm/rewarding parenting. CONCLUSIONS: High warm/rewarding parenting may partly impede the genetic expression of CU traits. Developmental models of CU traits need to account for such gene-environment processes. En ligne : http://dx.doi.org/10.1111/jcpp.12918 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=371

Genetic Causes of Autism Spectrum Disorders / Guillaume HUGUET  

Public ISBD in Neuronal and Synaptic Dysfunction in Autism Spectrum Disorder and Intellectual Disability / Carlo SALA Titre : Genetic Causes of Autism Spectrum Disorders Type de document : Texte imprimé et/ou numérique Auteurs : Guillaume HUGUET, Auteur ; Thomas BOURGERON, Auteur Année de publication : 2016 Importance : p.13-24 Langues : Anglais (eng) Mots-clés : Autism spectrum disorders  CNV  Heritability  SNV  Synapse  Twin studies Index. décimale : SCI-D SCI-D - Neurosciences Résumé : In the past 30 years, twin studies have indicated a strong genetic contribution to autism spectrum disorders (ASD). The heritability of ASD is estimated to be 50%. Whereas most of the inherited part of ASD is captured by common variants, our knowledge about the genetics of ASD comes almost exclusively from identification of highly penetrant de novo mutations through candidate gene or whole exome/genome sequencing studies. Approximately 10% of patients with ASD, especially those with intellectual disability, are carriers of de novo copy number or single nucleotide variants affecting clinically relevant genes for ASD. Because of the function of these genes, it was hypothesized that abnormal synaptic plasticity and failure of neuronal/synaptic homeostasis could increase the risk of ASD. It is hoped that this knowledge will lead to better diagnosis, care, and integration of individuals with ASD. En ligne : http://dx.doi.org/10.1016/B978-0-12-800109-7.00002-9 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=301 in Neuronal and Synaptic Dysfunction in Autism Spectrum Disorder and Intellectual Disability / Carlo SALA Genetic Causes of Autism Spectrum Disorders [Texte imprimé et/ou numérique] / Guillaume HUGUET, Auteur ; Thomas BOURGERON, Auteur . - 2016 . - p.13-24. Langues : Anglais (eng) Mots-clés : Autism spectrum disorders  CNV  Heritability  SNV  Synapse  Twin studies Index. décimale : SCI-D SCI-D - Neurosciences Résumé : In the past 30 years, twin studies have indicated a strong genetic contribution to autism spectrum disorders (ASD). The heritability of ASD is estimated to be 50%. Whereas most of the inherited part of ASD is captured by common variants, our knowledge about the genetics of ASD comes almost exclusively from identification of highly penetrant de novo mutations through candidate gene or whole exome/genome sequencing studies. Approximately 10% of patients with ASD, especially those with intellectual disability, are carriers of de novo copy number or single nucleotide variants affecting clinically relevant genes for ASD. Because of the function of these genes, it was hypothesized that abnormal synaptic plasticity and failure of neuronal/synaptic homeostasis could increase the risk of ASD. It is hoped that this knowledge will lead to better diagnosis, care, and integration of individuals with ASD. En ligne : http://dx.doi.org/10.1016/B978-0-12-800109-7.00002-9 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=301

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Investigation of VDR gene polymorphisms in twins with autism spectrum disorder / Ender COSKUNPINAR in Research in Autism Spectrum Disorders, 82 (April 2021)  

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Why do children read more? The influence of reading ability on voluntary reading practices / E. VAN BERGEN in Journal of Child Psychology and Psychiatry, 59-11 (November 2018)  

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