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White matter alterations in young children with prenatal alcohol exposure
Preeti Kar1,2, Jess E Reynolds1,2,3, Melody N Grohs1,2
1Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.
Insights
Prenatal alcohol exposure (PAE) in young children shows distinct brain white matter differences compared to older individuals. Early identification of these neurological changes is crucial for intervention.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Prenatal alcohol exposure (PAE) is linked to cognitive, behavioral, and social-emotional deficits.
- Existing neuroimaging studies on PAE primarily focus on older age groups, leaving a gap in understanding early childhood brain development.
- Early childhood is a critical period for brain development, making neurological insights vital for timely intervention in PAE.
Purpose of the Study:
- To investigate white matter structural differences in young children with confirmed prenatal alcohol exposure (PAE).
- To compare diffusion tensor imaging (DTI) metrics (FA, MD) and tract volumes between children with and without PAE.
- To understand the early neurological profile of PAE and its potential divergence from findings in older populations.
Main Methods:
- Studied 54 children (ages 2-7 years) with confirmed PAE and 54 age/sex-matched controls.
- Utilized diffusion tensor imaging (DTI) to assess fractional anisotropy (FA) and mean diffusivity (MD) in 10 major white matter tracts.
- Employed univariate analyses of covariance (ANCOVA) to compare group differences, controlling for age and sex.
Main Results:
- Children with PAE exhibited higher FA in the genu of the corpus callosum and lower MD in the bilateral uncinate fasciculus.
- The PAE group showed reduced tract volume in the corpus callosum, bilateral inferior fronto-occipital fasciculi, and right superior longitudinal fasciculus.
- Findings in young children (higher FA/lower MD) contrast with those in older PAE populations (lower FA/higher MD).
Conclusions:
- Young children with PAE display unique white matter alterations, differing from those observed in older individuals.
- These early structural brain differences in PAE highlight the need for further research into developmental trajectories.
- Understanding these early findings is critical for developing targeted interventions for children affected by prenatal alcohol exposure.
Abstract:
Prenatal alcohol exposure (PAE) can lead to cognitive, behavioural, and social-emotional challenges. Previous neuroimaging research has identified structural brain alterations in newborns, older children, adolescents, and adults with PAE; however, little is known about brain structure in young children. Extensive brain development occurs during early childhood; therefore, understanding the neurological profiles of young children with PAE is critical for early identification and effective intervention. We studied 54 children (5.21 ± 1.11 years; 27 males) with confirmed PAE (94% also had other prenatal exposures, 74% had adverse postnatal experiences) compared with 54 age- and sex-matched children without PAE. Children underwent diffusion tensor imaging between 2 and 7 years of age. Mean fractional anisotropy (FA) and mean diffusivity (MD) were obtained for 10 major white matter tracts. Univariate analyses of covariance were used to test group differences (PAE vs. control) controlling for age and sex. The PAE group had higher FA in the genu of the corpus callosum and lower MD in the bilateral uncinate fasciculus. The PAE group also had lower tract volume in the corpus callosum, the bilateral inferior fronto-occipital fasciculi, and the right superior longitudinal fasciculus. Our findings align with studies of newborns with PAE reporting lower diffusivity, but contrast those in older populations with PAE, which consistently report lower FA and higher MD. Further research is needed to understand trajectories of white matter development and how our results of higher FA/lower MD in young children connect with lower FA/higher MD observed at older ages.
