Reports

A longitudinal twin study of physical aggression during early childhood: evidence for a developmentally dynamic genome

-Report abstract and full article access page- (full report article requires a $45.00 purchase)

Author(s): University of Montreal and CHU Sainte-Justine University Hospital Research Center

  • Eric Lacourse, PhD
  • Michel Boivin, PhD
  • Mara Brendgen, PhD
  • Amélie Petitclerc, PhD
  • Alain Girard, MSc
  • Frank Vitaro, PhD
  • Stéphane Paquin, PhD candidate
  • Isabelle Ouellet-Morin, PhD
  • Ginette Dionne, PhD
  • Richard E. Tremblay, PhD

Published:

Report Intro/Brief:
Background – Physical aggression (PA) tends to have its onset in infancy and to increase rapidly in frequency. Very little is known about the genetic and environmental etiology of PA development during early childhood. We investigated the temporal pattern of genetic and environmental etiology of PA during this crucial developmental period.

Method Participants were 667 twin pairs, including 254 monozygotic and 413 dizygotic pairs, from the ongoing longitudinal Quebec Newborn Twin Study. Maternal reports of PA were obtained from three waves of data at 20, 32 and 50 months. These reports were analysed using a biometric Cholesky decomposition and linear latent growth curve model.

Results – The best-fitting Cholesky model revealed developmentally dynamic effects, mostly genetic attenuation and innovation. The contribution of genetic factors at 20 months substantially decreased over time, while new genetic effects appeared later on. The linear latent growth curve model revealed a significant moderate increase in PA from 20 to 50 months. Two separate sets of uncorrelated genetic factors accounted for the variation in initial level and growth rate. Non-shared and shared environments had no effect on the stability, initial status and growth rate in PA.

Conclusions – Genetic factors underlie PA frequency and stability during early childhood; they are also responsible for initial status and growth rate in PA. The contribution of shared environment is modest, and perhaps limited, as it appears only at 50 months. Future research should investigate the complex nature of these dynamic genetic factors through genetic–environment correlation (r GE) and interaction (G × E) analyses.”
-from the abstract

Comments

Youth Today is the only independent, internationally distributed digital media publication that is read by thousands of professionals in the youth service field.

Youth Today adheres to high-quality journalistic standards, providing readers with professional news coverage dedicated to examining a wide spectrum of complex issues in the youth services industry from legislation to community-based youth work.

EDITORIAL INDEPENDENCE

Our organization retains full authority over editorial content to protect the best journalistic and business interests of our organization. We maintain a firewall between news coverage decisions and sources of all revenue.

DONORS & DONOR TRANSPARENCY

We are committed to transparency in every aspect of funding our organization. Donors may be quoted, mentioned or featured in our stories. Our news judgments are made independently – not based on or influenced by donors. Accepting financial support does not mean we endorse donors or their products, services or opinions…(read more)

Recent Comments

Archives

Categories

Search

Kennesaw State University Mountain Logo & Ceneter for Sustainable Journalism Logo
LOGO Institute for Nonprofit News 3 turquoise boxes stacked in "J" shape

Copyright © 2018 Youth Today and MVP Themes --- Published by Center for Sustainable Journalism,
Kennesaw State University, 1200 Chastain Blvd. Suite 310, Kennesaw GA 30144

To Top