With the rapid development of sequencing technology, scientists have been able to study and acquire a better understanding of non-coding RNAs (ncRNAs). Circular RNAs (circRNAs), a unique class of ncRNAs with a special loop structure, have been found to possess modulatory properties with respect to various biological processes, such as interacting with nucleic acids or proteins. In addition to their tissue-specific expression and high conservation across species, circRNAs are abundant and dynamically expressed in the nervous system, especially in nerve synapse, indicating their potential regulation in synaptic plasticity or neuronal disorders. In this review, we discuss the characteristics of circRNAs and their common biological functions, as well as their significant role in neurodevelopment, drug addiction and neurodegenerative diseases, aiming to guide further disease diagnoses and efficient therapy.
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