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Intracellular auto-circularizing RNA using human tRNA splicing elements

Ma, Q.; Tang, C.; Wang, J.; Liu, Y.; Sun, X.; Zhao, S.

2025-07-31 cell biology
10.1101/2025.07.28.667085 bioRxiv
Show abstract

Circular RNAs (circRNAs), a type of covalently closed RNA, have emerged as crucial regulatory factors in gene expression and development across various organisms. Understanding their formation and functional mechanisms holds potential for therapeutic applications, including novel RNA vaccines against diseases such as COVID-19. However, practical challenges still exist in the preparation of circRNAs. In this study, we explored the influence of human tRNA splicing elements on circRNAs formation and identified effective sequences for intracellular auto-circularization. We developed a generic auto-circularizing RNA (acRNA) framework template, optimized various key components of circRNAs formation, and proposed a more efficient and precise intracellular auto-circularization method. This study provides novel insights into the production mechanism of circRNA and establishes a simple and effective method for intracellular auto-circularization.

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