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Altered Developmental Trajectory in Male and Female Rats in a Prenatal Valproic Acid Exposure Model of Autism
Kumari Anshu1,2, Ajay Kumar Nair1,3, Shoba Srinath4
1Department of Neurophysiology, National Institute of Mental Health and Neurosciences (NIMHANS), Hosur Main Road, Bengaluru, Karnataka, 560029, India.
Journal of Autism and Developmental Disorders
|August 17, 2022
Summary
Early developmental delays in motor and sensory function are key Autism Spectrum Disorder (ASD) indicators. This study identified sex-specific delays in a VPA rat model, offering a new composite score for ASD research.
Area of Science:
- Neurodevelopmental Disorders
- Autism Spectrum Disorder Research
- Animal Models of Neurodevelopment
Background:
- Early motor and sensory developmental delays are recognized precursors to Autism Spectrum Disorder (ASD) diagnosis.
- Existing research on sensorimotor development in animal models of ASD is limited, often male-focused, and presents inconsistent findings.
- The prenatal valproic acid (VPA) model is utilized to investigate potential early indicators of ASD.
Purpose of the Study:
- To characterize early sensorimotor development in a prenatal valproic acid (VPA) rat model of Autism Spectrum Disorder (ASD).
- To investigate potential sex-specific differences in developmental trajectories within this ASD model.
- To develop a comprehensive metric for assessing early developmental changes relevant to ASD.
Main Methods:
- Utilized a prenatal valproic acid (VPA) exposure model in rats to simulate conditions associated with Autism Spectrum Disorder (ASD).
- Conducted a comprehensive assessment of early physical, sensory, and motor development across multiple test readouts.
- Developed a novel 'developmental composite score' by integrating data from 15 distinct developmental tests.
Main Results:
- Observed significant sex-specific developmental delays in the VPA-exposed rat group compared to controls.
- The created developmental composite score effectively differentiated between VPA-exposed and control subjects.
- This composite score provided a reliable measure of overall physical, sensory, and motor development.
Conclusions:
- Prenatal VPA exposure induces sex-specific early developmental delays, suggesting potential utility in modeling ASD.
- The developed developmental composite score offers a robust and reliable metric for assessing neurodevelopmental trajectories.
- This composite score can facilitate comparisons across diverse animal models of ASD and serve as an outcome measure for early intervention studies.
