Altered Cerebellar Lobular Volumes Correlate with Clinical Deficits in Siblings and Children with ASD: Evidence from Toddlers

Abstract

Background Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder characterized by impaired social and communication skills, narrow interests, and repetitive behavior. It is known that the cerebellum plays a vital role in controlling movement and gait posture. However, recently, researchers have reported that the cerebellum may also be responsible for other functions, such as social cognition, reward, anxiety, language, and executive functions. Methods In this study, we ascertained volumetric differences from cerebellar lobular volumetric analysis from children with ASD, ASD siblings, and typically developing children. We also performed a correlation analysis of these children's developmental and behavioral measures. In this cross-sectional study, MRI data were acquired under natural sleep when participants aged between 1 and 3 years. Two-way ANOVA and Pearson correlation was performed for statistical data analysis. Results We observed intriguing findings from this study, including significantly increased gray matter lobular volumes in vermis, left and right lobule I-V, right CrusII, and right VIIb and VIIIb, respectively, in children with ASD, compared to typically developing healthy controls and ASD siblings. Multiple cerebellar lobular volumes were also significantly correlated with social quotient, cognition, language, and motor scores with children with ASD, ASD siblings, and healthy controls, respectively. Conclusions This research finding helps us understand the neurobiology of ASD and critically advances current knowledge about the cerebellar role in ASD. However, results need to be replicated for a larger cohort from longitudinal research.