5 results match your criteria QNTS Quebec Newborn Twin Study

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Early warm-rewarding parenting moderates the genetic contributions to callous-unemotional traits in childhood.

J Child Psychol Psychiatry 2018 Apr 23. Epub 2018 Apr 23.

School of Psychology, Laval University, Quebec City, QC, Canada.

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. Read More

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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

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October 2015
12 Reads

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

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October 2014
1 Read

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

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February 2013
4 Reads

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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