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However, integrating these data types poses significant challenges when their features are weakly linked and cell population sizes are imbalanced. Currently, no method efficiently addresses these two issues simultaneously. Therefore, we developed CelLink, a novel single-cell multi-omics data integration method designed to overcome these challenges. CelLink normalizes and smooths feature profiles to align scales across datasets and integrates them through a multi-phase pipeline that iteratively employs the optimal transport algorithm. It dynamically refines cell\u2013cell correspondences, identifying and excluding cells that cannot be reliably matched, thus avoiding performance degradation caused by erroneous imputations. This approach effectively adapts to weak feature linkage and imbalanced cell populations between datasets. Benchmarking CelLink on scRNA-seq and spatial proteomics datasets, as well as paired CITE-seq data, demonstrates its superior performance across various evaluation metrics, including data mixing, cell manifold structure preservation, and feature imputation accuracy. Compared to state-of-the-art methods, CelLink significantly outperforms others in imbalanced cell populations while consistently achieving better performance for balanced datasets. Moreover, CelLink uniquely enables cell subtype annotation, correction of mislabeled cells, and spatial transcriptomic analyses by imputing transcriptomic profiles for spatial proteomics data. Its great ability to impute large-scale paired single-cell multi-omics data positions it pivotal for building single-cell multi-modal foundation models and spatial cellular biology.<\/jats:p>","DOI":"10.1093\/nar\/gkaf1270","type":"journal-article","created":{"date-parts":[[2025,10,29]],"date-time":"2025-10-29T13:14:25Z","timestamp":1761743665000},"source":"Crossref","is-referenced-by-count":2,"title":["CelLink: integrating single-cell multi-omics data with weak feature linkage and imbalanced cell populations"],"prefix":"10.1093","volume":"53","author":[{"given":"Xin","family":"Luo","sequence":"first","affiliation":[{"name":"Gilbert S. Omenn Department of Computational Medicine and Bioinformatics, University of Michigan , Ann Arbor, MI 48109 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanhao","family":"Huang","sequence":"additional","affiliation":[{"name":"Gilbert S. 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