Autism is characterized by tremendous phenotypic heterogeneity likely due to its complex genetic and neural underpinnings. Research from our own lab and others'have provided mounting evidence of decreased responsivity to social stimuli and altered patterns of brain connectivity in individuals with autism specrum disorders (ASD). Moreover, we have recently shown that aberrant functional and structural connectivity is significantly related to genetic vulnerability to the disorder. Despite these significant strides, critical questions remain unanswered with regard to (i) the underlying mechanisms that may give rise to the reduced mirroring and reward-related responses to social stimuli we have previously characterized, (ii) the relationship between the functioning of these circuits and aberrant connectivity, (iii) the extent to which the latter reflects the cause or the effect of altered developmental trajectories in ASD and, more broadly, (iv) how known genetic risk factors for ASD impact brain circuitry subserving complex social behaviors. The proposed studies are designed to address these issues, while seeking to build synergy amongst competing neurobiological accounts of ASD. Capitalizing on our history of NIH funded research in children with ASD, and thus the opportunity to study previously characterized cohorts, we are uniquely positioned to systematically chart longitudinal changes in brain activity and connectivity in children with and without ASD, and to relate the observed developmental trajectories to both behavioral phenotypes and autism risk genes. More specifically, using a cross-lagged longitudinal design, we will perform functional magnetic resonance imaging (fMRI), resting-state fMRI (rs-fMRI) and diffusion tensor imaging (DTI) at two timepoints (3 years apart) in two previously characterized age cohorts (6-9 &12-14 years of age at first assessment) and relate these data to behavioral phenotypes and ASD risk polymorphisms. This integrated research approach will exploit the strengths of each investigative method, as well as the synergy amongst them, to identify the earliest departures from typical development and delineate the complex interactions among genes, brain,and behavior that drive and constrain the atypical development of the social brain ASD.

Public Health Relevance

The longitudinal studies conducted under Project IV will lead to a better characterization of functional brain networks in individuals with ASD that may ultimately be useful for earlier diagnosis as well as for informing the development of targeted behavioral and pharmacological interventions and/or evaluating their effectiveness.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Specialized Center (P50)
Project #
2P50HD055784-06
Application #
8426262
Study Section
Special Emphasis Panel (ZHD1-DSR-Y (54))
Project Start
2012-09-04
Project End
2017-05-31
Budget Start
2012-09-04
Budget End
2013-05-31
Support Year
6
Fiscal Year
2012
Total Cost
$191,823
Indirect Cost
$58,123
Name
University of California Los Angeles
Department
Type
DUNS #
092530369
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Di Martino, Adriana; O'Connor, David; Chen, Bosi et al. (2017) Enhancing studies of the connectome in autism using the autism brain imaging data exchange II. Sci Data 4:170010
Schoch, Kelly; Meng, Linyan; Szelinger, Szabolcs et al. (2017) A Recurrent De Novo Variant in NACC1 Causes a Syndrome Characterized by Infantile Epilepsy, Cataracts, and Profound Developmental Delay. Am J Hum Genet 100:343-351
Green, Shulamite A; Hernandez, Leanna; Bookheimer, Susan Y et al. (2017) Reduced modulation of thalamocortical connectivity during exposure to sensory stimuli in ASD. Autism Res 10:801-809
Dickinson, Abigail; DiStefano, Charlotte; Senturk, Damla et al. (2017) Peak alpha frequency is a neural marker of cognitive function across the autism spectrum. Eur J Neurosci :
Varcin, Kandice J; Jeste, Shafali S (2017) The emergence of autism spectrum disorder: insights gained from studies of brain and behaviour in high-risk infants. Curr Opin Psychiatry 30:85-91
DiStefano, Charlotte; Gulsrud, Amanda; Huberty, Scott et al. (2016) Identification of a distinct developmental and behavioral profile in children with Dup15q syndrome. J Neurodev Disord 8:19
Tsang, Tawny; Gillespie-Lynch, Kristen; Hutman, Ted (2016) Theory of Mind Indexes the Broader Autism Phenotype in Siblings of Children with Autism at School Age. Autism Res Treat 2016:6309189
Harrop, Clare; Gulsrud, Amanda; Shih, Wendy et al. (2016) Characterizing caregiver responses to restricted and repetitive behaviors in toddlers with autism spectrum disorder. Autism 20:330-42
Miller, Meghan; Iosif, Ana-Maria; Young, Gregory S et al. (2016) School-age outcomes of infants at risk for autism spectrum disorder. Autism Res 9:632-42
Gulsrud, Amanda C; Hellemann, Gerhard; Shire, Stephanie et al. (2016) Isolating active ingredients in a parent-mediated social communication intervention for toddlers with autism spectrum disorder. J Child Psychol Psychiatry 57:606-13

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