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    4 results match your criteria QNTS Quebec Newborn Twin Study

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    Phenotypic and genetic associations between reading comprehension, decoding skills, and ADHD dimensions: evidence from two population-based studies.
    J Child Psychol Psychiatry 2015 Oct 12;56(10):1074-82. Epub 2015 Feb 12.
    Research Unit on Children's Psychosocial Maladjustment, Quebec City, Canada.
    Background: The phenotypic and genetic associations between decoding skills and ADHD dimensions have been documented but less is known about the association with reading comprehension. The aim of the study is to document the phenotypic and genetic associations between reading comprehension and ADHD dimensions of inattention and hyperactivity/impulsivity in early schooling and compare them to those with decoding skills.

    Methods: Data were collected in two population-based samples of twins (Quebec Newborn Twin Study - QNTS) and singletons (Quebec Longitudinal Study of Child Development - QLSCD) totaling ≈ 2300 children. Read More

    Genome-wide DNA methylation variability in adolescent monozygotic twins followed since birth.
    Epigenetics 2014 Oct;9(10):1410-21
    a CHU Sainte-Justine Research Center ; Montreal , Canada.
    DNA methylation patterns are characterized by highly conserved developmental programs, but allow for divergent gene expression resulting from stochastic epigenetic drift or divergent environments. Genome-wide methylation studies in monozygotic (MZ) twins are providing insight into the extent of epigenetic variation that occurs, irrespective of genotype. However, little is known about the variability of DNA methylation patterns in adolescence, a period involving significant and rapid physical, emotional, social, and neurodevelopmental change. Read More

    The Quebec Newborn Twin Study into adolescence: 15 years later.
    Twin Res Hum Genet 2013 Feb 3;16(1):64-9. Epub 2012 Dec 3.
    School of Psychology, Université Laval, Québec, Canada.
    The Quebec Newborn Twin Study (QNTS) is an ongoing prospective longitudinal follow-up of a birth cohort of twins born between 1995 and 1998 in the greater Montreal area, Québec, Canada. The goal of QNTS is to document individual differences in the cognitive, behavioral, and social-emotional aspects of developmental health across childhood, their early bio-social determinants, as well as their putative role in later social-emotional adjustment, school and health outcomes. A total of 662 families of twins were initially assessed when the twins were aged 6 months. Read More

    Genetic and environmental influences on body size in early childhood: a twin birth-cohort study.
    Twin Res Hum Genet 2007 Jun;10(3):479-85
    Department of Epidemiology and Community Medicine, Faculty of Medicine, University of Ottawa, and Institute of Population Health, Ottawa, Canada.
    Genetic and environmental contributions to body size from birth to 5 years in a population-based twin cohort were studied. Sex differences in gene-environment etiology were also explored. Analyses used data from the Quebec Newborn Twin Study (QNTS), a population-based birth cohort of 672 twin pairs. Read More

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