The epilepsy-autism spectrum disorder phenotype in the era of molecular genetics and precision therapy

Area of Science:

• Neuroscience
• Genetics
• Developmental Pediatrics

Background:

• Autism spectrum disorder (ASD) is often linked with epileptic encephalopathy in infants, complicating early diagnosis due to varied clinical presentations.
• Shared biological and molecular mechanisms, particularly genetic factors, are increasingly recognized between ASD and epilepsy, exemplified by conditions like tuberous sclerosis complex.

Purpose of the Study:

• To review the current understanding of the causal mechanisms linking epilepsy and ASD, with a specific emphasis on genetic underpinnings.
• To explore hypothetical explanations for the co-occurrence of these conditions, including synaptic and neuronal imbalances.

Main Methods:

• Literature review focusing on genetic investigations and experimental models.
• Analysis of genetic risk factors clustering around ion channels, synaptic function, and transcription regulators.
• Examination of the role of the mammalian target of rapamycin (mTOR) pathway in ASD and epilepsy.

Main Results:

• Genetic research has identified numerous genes associated with ASD and epilepsy, frequently implicating abnormalities in ion channels, synaptic function/structure, and transcription regulators.
• The mammalian target of rapamycin (mTOR) pathway and related "mTORpathies" are highlighted as significant areas of research.
• Experimental models are crucial for elucidating gene functions and disease progression.

Conclusions:

• Common genetic factors and biological pathways, such as synaptic and neuronal regulation, contribute to the co-occurrence of ASD and epilepsy.
• Advances in molecular testing offer potential for earlier diagnosis and improved therapeutic strategies.
• Precision medicine, including gene therapy, represents a future direction for managing these complex conditions.