RT Journal
A1 Shao, Jiangyi
A1 Chen, Shutao
A1 Wang, Ziwen
A1 Chen, Zixu
A1 Liu, Bin
T1 Balancing gene ontology annotation specificity in protein function prediction based on the protein sequence large graph
JF Genome Research 
JO Genome Research 
YR 2026 
FD April 15 
DO 10.1101/gr.280816.125 
SP gr.280816.125 
UL http://genome.cshlp.org/content/early/2026/04/15/gr.280816.125.abstract 
AB Accurate protein function prediction is fundamental to advancing drug discovery, precision medicine, and understanding complex biological systems. While gene ontology (GO) provides a standardized framework for protein annotation, a critical challenge persists: the imbalance between low-specificity GO terms and high-specificity GO terms. This imbalance creates blind spots in our understanding of protein function landscapes, particularly in clinically relevant pathways. We present ProGO-PSL, a novel large graph architecture designed to resolve this imbalance. ProGO-PSL simultaneously leverages explicit domain identifier from InterPro and implicit evolutionary context from Multiple Sequence Alignments, fusing these complementary data sources within a powerful imbalance learning framework. Our model consistently outperforms state-of-the-art methods by 5-15% across all specificity levels and on both benchmark dataset and independent test set, demonstrating robust generalization. Furthermore, ProGO-PSL generates interpretable representations that clarify relationships between low- and high-specificity GO terms, enabling a more complete functional characterization of the proteome. This work accelerates the identification of therapeutic targets in previously uncharacterized biological pathways.