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Review
. 2023 May 15;93(10):905-920.
doi: 10.1016/j.biopsych.2023.01.013. Epub 2023 Jan 28.

Genetic Influences on the Developing Young Brain and Risk for Neuropsychiatric Disorders

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Review

Genetic Influences on the Developing Young Brain and Risk for Neuropsychiatric Disorders

Ann M Alex et al. Biol Psychiatry. .

Abstract

Imaging genetics provides an opportunity to discern associations between genetic variants and brain imaging phenotypes. Historically, the field has focused on adults and adolescents; very few imaging genetics studies have focused on brain development in infancy and early childhood (from birth to age 6 years). This is an important knowledge gap because developmental changes in the brain during the prenatal and early postnatal period are regulated by dynamic gene expression patterns that likely play an important role in establishing an individual's risk for later psychiatric illness and neurodevelopmental disabilities. In this review, we summarize findings from imaging genetics studies spanning from early infancy to early childhood, with a focus on studies examining genetic risk for neuropsychiatric disorders. We also introduce the Organization for Imaging Genomics in Infancy (ORIGINs), a working group of the ENIGMA (Enhancing NeuroImaging Genetics through Meta-Analysis) consortium, which was established to facilitate large-scale imaging genetics studies in infancy and early childhood.

Keywords: Childhood; Genetics; Imaging; Infant; Magnetic resonance imaging; Pediatric.

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Figures

Figure 1
Figure 1
Early neurodevelopment is a sensitive period for accumulating transdiagnostic risk for psychiatric disorders. Neurodevelopment in the human brain begins from approximately 2 weeks after conception. Neurogenesis and neural migration are primarily prenatal processes, and neurite outgrowth is minimal after 4 years of age. Myelination and synaptic pruning continue beyond 6 years of age (indicated by the small arrows). Genetic influences on these various processes contribute to psychiatric risk, which accumulates across development and may not manifest until later in life (large orange arrow).
Figure 2
Figure 2
PhenoGram of genes associated with brain imaging phenotypes in infants and young children from candidate gene studies and genome-wide association studies. CT, cortical thickness; FA, fractional anisotropy; GMV, gray matter volume; ICV, intracranial volume; MWF, myelin water fraction; PFC, prefrontal cortex; SA, surface area; TBV, total brain volume; WM, white matter; WMV, white matter volume.
Figure 3
Figure 3
Data analysis plan for the ORIGINs (Organization for Imaging Genomics in Infancy). DIP, developmental imaging phenotype; DTI, diffusion tensor imaging; fMRI, functional magnetic resonance imaging; PGC, Psychiatric Genomics Consortium.

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