Decoding the m6A epitranscriptomic landscape for biotechnological applications using a direct RNA sequencing approach
Chuwei Liu, Heng Liang, Arabella Wan, Min Xiao, Lei Sun, Yiling Yu, Shijia Yan, Yuan Deng, Ruonian Liu, Juan Fang, Zhi Wang, Weiling He, Guohui Wan
Abstract
Abstract Epitranscriptomic modifications, particularly N6-methyladenosine (m 6 A), are crucial regulators of gene expression, influencing processes such as RNA stability, splicing, and translation. Traditional computational methods for detecting m 6 A from Nanopore direct RNA sequencing (DRS) data are constrained by their reliance on experimentally validated labels, often resulting in the underestimation of modification sites. Here, we introduce pum6a, an innovative attention-based framework that integrates positive and unlabeled multi-instance learning (MIL) to address the challenges of incomplete labeling and missing read-level annotations. By combining electrical signal features with base alignment data and employing a weighted Noisy-OR probability mechanism, pum6a achieves enhanced sensitivity and accuracy in m 6 A detection, particularly in low-coverage loci. Pum6a outperforms existing methods in identifying m 6 A sites across various cell lines and species, without requiring extensive parameter tuning. We further apply pum6a to study the dynamic regulation of m 6 A demethylases in gastric cancer under hypoxia, revealing distinct roles for FTO and ALKBH5 in modulating m 6 A modifications and uncovering key insights into m 6 A -mediated transcript stability. Our findings highlight the potential of pum6a as a powerful tool for advancing the understanding of epitranscriptomic regulation in health and disease, paving the way for biotechnological and therapeutic applications.