The Young Netherlands Twin Register (YNTR): Longitudinal Twin and Family Studies in Over 70,000 Children

Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands.
Twin Research and Human Genetics (Impact Factor: 2.3). 11/2012; 16(1):1-16. DOI: 10.1017/thg.2012.118
Source: PubMed


The Netherlands Twin Register (NTR) began in 1987 with data collection in twins and their families, including families with newborn twins and triplets. Twenty-five years later, the NTR has collected at least one survey for 70,784 children, born after 1985. For the majority of twins, longitudinal data collection has been done by age-specific surveys. Shortly after giving birth, mothers receive a first survey with items on pregnancy and birth. At age 2, a survey on growth and achievement of milestones is sent. At ages 3, 7, 9/10, and 12 parents and teachers receive a series of surveys that are targeted at the development of emotional and behavior problems. From age 14 years onward, adolescent twins and their siblings report on their behavior problems, health, and lifestyle. When the twins are 18 years and older, parents are also invited to take part in survey studies. In sub-groups of different ages, in-depth phenotyping was done for IQ, electroencephalography , MRI, growth, hormones, neuropsychological assessments, and cardiovascular measures. DNA and biological samples have also been collected and large numbers of twin pairs and parents have been genotyped for zygosity by either micro-satellites or sets of short nucleotide polymorphisms and repeat polymorphisms in candidate genes. Subject recruitment and data collection is still ongoing and the longitudinal database is growing. Data collection by record linkage in the Netherlands is beginning and we expect these combined longitudinal data to provide increased insights into the genetic etiology of development of mental and physical health in children and adolescents.

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Available from: Meike Bartels, Jan 19, 2014
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    • "The minimum age to participate in the ANTR was age 12. Every 2–3 years lifestyle, health and behavior are assessed by surveys in an ongoing data collection. Previous research has established that the NTR data can be considered as representative of the Dutch population [van Beijsterveldt et al., 2013]. "
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    ABSTRACT: To investigate the utility of longitudinal data in genetic analyses of symptoms of anxiety and depression, we assessed individual differences between age 7 and 18 using growth mixture models, and investigated the genetic and non-genetic factors contributing to the trajectories. Mothers of 7,706 girl and 7,418 boy twins from the Netherlands Twin Register rated the anxious depression scale (SxAnxDep) of the Child Behavior Check List (CBCL) at age 7, 10, and 12 years. Two thousand seven hundred and six girl and 1,856 boy twins completed the Youth Self Report (YSR) at age 14, 16, and 18. While individual trajectories varied considerably, these differences were largely idiosyncratic and could not be grouped into separate latent classes with class-specific average growth curves. The intercept, which reflects the individuals' baseline level of SxAnxDep across time, explained 55-58% of the total phenotypic variance. The slope factor, which captures a common average trend over time, did not explain variance in the phenotype. This finding also underlines the high level of idiosyncrasy of trajectories that lack a common longitudinal structure. The analyses of twin data showed that the random intercept factor of SxAnxDep during childhood and during adolescence is considerably more heritable than the observations at any single age, namely between 60% and 84%. One explanation is that different factors contribute to the level of symptoms of anxiety and depression at any given time point, including temporary events and emotions. When considering baseline stability, these temporary influences average out, with the result of a more reliable and more heritable phenotype. © 2015 Wiley Periodicals, Inc. © 2015 Wiley Periodicals, Inc.
    American Journal of Medical Genetics Part B Neuropsychiatric Genetics 09/2015; DOI:10.1002/ajmg.b.32375 · 3.42 Impact Factor
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    • "development of the children is sent to the parents of the twins every 2 years until the twins are 12 years old (Boomsma et al. 2002, 2006; van Beijsterveldt et al. 2013). Since 1999, at approximately age 7, 9 and 12, when the twins attend primary school, parents are asked for their consent to approach the teacher(s) of their children with a survey. "
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    ABSTRACT: One criterion for a diagnostic and statistical manual of mental disorders (DSM-IV) diagnosis of attention deficit hyperactivity disorder (ADHD) and oppositional defiant disorder (ODD) is that symptoms are present in at least two settings, and often teacher ratings are taken into account. The short Conners’ Teacher Rating Scales—Revised (CTRS-R) is a widely used standardized instrument measuring ODD and ADHD behavior in a school setting. In the current study CTRS-R data were available for 7, 9 and 12-year-old twins from the Netherlands Twin Register. Measurement invariance (MI) across student gender and teacher gender was established for three of the four scales (Oppositional Behavior, Hyperactivity and ADHD Index) of the CTRS-R. The fourth scale (ATT) showed an unacceptable model fit even without constraints on the data and revision of this scale is recommended. Gene-environment (GxE) interaction models revealed that heritability was larger for children sharing a classroom. There were some gender differences in the heritability of ODD and ADHD behavior and there was a moderating effect of teacher’s gender at some of the ages. Taken together, this indicates that there was evidence for GxE interaction for classroom sharing, gender of the student and gender of the teacher. Electronic supplementary material The online version of this article (doi:10.1007/s10519-015-9712-z) contains supplementary material, which is available to authorized users.
    Behavior Genetics 02/2015; 45(4). DOI:10.1007/s10519-015-9712-z · 3.21 Impact Factor
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    • "In the current study, three forms of perfectionism were distinguished, on the basis of the MPS: global perfectionism (sum score of all subscales except organization), healthy perfectionism (comprised of personal standards and organization ) and unhealthy perfectionism (comprised of concern over mistakes, parental expectations, parental criticism and doubt about actions; Stumpf & Parker, 2000). A life events scale from the longitudinal survey studies of the Young Netherlands Twin Register (Van Beijsterveldt et al., 2013) was used. This scale consists of 13 items and was derived from other existing scales (Van der Velden, Van der Burg, Steinmetz , & Van den Bout, 1992; Middeldorp, Cath, Vink, & Boomsma, 2005; Kaprio, Pulkkinen, & Rose, 2002) to assess stressful life events. "
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    ABSTRACT: The stress response is regulated by the mineralocorticoid receptor (MR) and the glucocorticoid receptor (GR). When the balance between GR and MR signalling is disturbed, one's capacity to cope with a stressful event is diminished. In this pilot study, we tested the hypothesis that an interaction between common variants in the MR (rs5522) or GR gene (rs41423247) and stressful life events influences perfectionism levels in a group of patients with an eating disorder (ED; n = 113). Patients carrying the minor G allele of rs5522 had a higher perfectionism score if more stressful life events were experienced [β = 0.95, t(109) = 3.75, p < 0.01]. This effect was not found for patients carrying the AA genotype. These results suggest that rs5522 G allele carriers might be vulnerable to stressful life events. When patients with an ED are carriers and experience multiple life events, this might fuel their insecurity, which in turn may engender higher levels of perfectionism. Further studies are necessary to replicate and expand our findings. Copyright © 2014 John Wiley & Sons, Ltd and Eating Disorders Association.
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