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However, accurate cell type annotation for scDNAm data remains challenging, as the distinct data distribution of scDNAm hinders the adaptation of annotation methods from other omics, and specialized annotation tools for scDNAm are currently lacking. Here, MethyAnno is proposed as an interpretable deep metric learning framework that leverages multi\u2010scale information for accurate cell type annotation of scDNAm data. Additionally, MethyAnno enables generalized category discovery in open\u2010set scenarios by utilizing density\u2010based clustering to automatically estimate the number of novel cell types, while simultaneously deciphering cell\u2010type\u2010specific epigenetic signatures for biological interpretability. Extensive experiments demonstrate that MethyAnno excels in cross\u2010dataset annotation and novel type discovery, showing exceptional robustness in few\u2010shot scenarios for rare cell types. Moreover, interpretability analysis in the human brain dataset correctly recovers the genetic link between Sst interneurons and epilepsy heritability, the association of OPC cells with Alzheimer's disease, as well as the regulatory role of Pvalb cells in synaptic plasticity. Taken together, these findings establish MethyAnno as a robust and biologically interpretable tool for accurate cell type annotation and downstream epigenetic analysis.<\/jats:p>","DOI":"10.1002\/advs.77524","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T04:44:28Z","timestamp":1788324268000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["MethyAnno: An Interpretable Automated Annotation Method Leveraging Multi\u2010Scale Information and Metric Learning Framework for scDNAm Data"],"prefix":"10.1002","author":[{"given":"Yuhang","family":"Jia","sequence":"first","affiliation":[{"name":"School of Mathematical Sciences and LPMC Nankai University  Tianjin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7233-7903","authenticated-orcid":false,"given":"Siyu","family":"Li","sequence":"additional","affiliation":[{"name":"School of 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