Animal models of autism: a perspective from autophagy mechanisms

Abstract

Autism spectrum disorder (ASD) is characterized by impairments in social interaction and the presence of stereotypy and restrictive behavior. The clinical heterogeneity of ASD makes it difficult to explain the mechanisms underlying the disease. In recent years, the association between autophagy and neuropsychiatric diseases has been investigated. In this review, we aimed elucidate the relationship between autism and autophagy mechanism in well-known autism relevant animal models. Autophagy is a cell-protective mechanism that allows cell survival in low nutrient conditions, often through the degradation of aging and damaged proteins and organelles. The target of rapamycin (TOR) complex is activated for the activation of autophagy. Apart from mTOR animal models, the valproic acid model is frequently used in autism studies. The coiled-coil and C2 domain containing 1A (CC2D1A) gene is one of the new candidate genes associated with ASD. In a recent study that used Cc2d1a knock-out mice, microtubule-associated protein 1A/1B-light chain 3 (LC3) and Beclin 1 expression levels were dysregulated in the hippocampus. It is thought that the impaired autophagy mechanism contributes to the etiology of ASD. These results showed that CC2D1A acts as a new biological pathway in autophagy. Choosing the right model is crucial for ASD studies, and further progress will be made as these results become available in the clinic. In particular, it is expected that further studies on CC2D1A will provide new information in this field.

Keywords

Autism / animal models / autophagy / CC2D1A / mammalian target of rapamycin / valproic acid

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