Studying autism in rodent models: reconciling endophenotypes with comorbidities

Area of Science:

• Neuroscience
• Animal Models
• Autism Spectrum Disorder Research

Background:

• Autism spectrum disorder (ASD) is frequently accompanied by comorbid conditions such as seizures, anxiety, and motor deficits.
• These comorbid traits exacerbate core ASD symptoms and negatively impact daily functioning.
• The underlying causes of these comorbid features in ASD remain largely unknown.

Purpose of the Study:

• To review the characterization of endophenotypes in rodent models relevant to both core and comorbid features of ASD.
• To explore how studying these endophenotypes in animal models can offer insights into the biological mechanisms of ASD.
• To identify research gaps in the study of ASD-related endophenotypes in animal models.

Main Methods:

• Review of existing literature on environmental, genetic, and behavioral rodent models of ASD.
• Analysis of studies characterizing endophenotypes in these models.
• Identification of comorbid features represented in animal models.

Main Results:

• Rodent models of ASD exhibit core ASD-like behaviors alongside endophenotypes related to comorbid features such as altered sensory processing, seizure susceptibility, anxiety-like behavior, and motor deficits.
• These shared endophenotypes suggest common underlying biological pathways in ASD.
• The study of gastrointestinal function, aggression, and sleep disturbances in ASD animal models is an emerging area requiring more research.

Conclusions:

• Endophenotypes in rodent models reflect key comorbid features of ASD, offering valuable insights into the disorder's biology.
• Further investigation into a broader range of endophenotypes, including gastrointestinal, aggressive, and sleep-related behaviors, is necessary.
• Comprehensive study of these endophenotypes in animal models is essential for advancing the understanding of ASD etiology.