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The dynamic formation of the tumour microenvironment influences the therapeutic response and clinical outcome. Thus, characterizing the developmental landscape and identifying driver features at multiple levels will help us understand the pathological development of disease in individual cell populations and further contribute to precision medicine. Here, we describe a database, CellTracer (http:\/\/bio-bigdata.hrbmu.edu.cn\/CellTracer), which aims to dissect the causative multilevel interplay contributing to cell development trajectories. CellTracer consists of the gene expression profiles of 1 941 552 cells from 222 single-cell datasets and provides the development trajectories of different cell populations exhibiting diverse behaviours. By using CellTracer, users can explore the significant alterations in molecular events and causative multilevel crosstalk among genes, biological contexts, cell characteristics and clinical treatments along distinct cell development trajectories. CellTracer also provides 12 flexible tools to retrieve and analyse gene expression, cell cluster distribution, cell development trajectories, cell-state variations and their relationship under different conditions. Collectively, CellTracer will provide comprehensive insights for investigating the causative multilevel interplay contributing to cell development trajectories and serve as a foundational resource for biomarker discovery and therapeutic exploration within the tumour microenvironment.<\/jats:p>","DOI":"10.1093\/nar\/gkac892","type":"journal-article","created":{"date-parts":[[2022,10,16]],"date-time":"2022-10-16T09:59:58Z","timestamp":1665914398000},"page":"D861-D869","source":"Crossref","is-referenced-by-count":6,"title":["CellTracer: a comprehensive database to dissect the causative multilevel interplay contributing to cell development trajectories"],"prefix":"10.1093","volume":"51","author":[{"given":"Qiuyan","family":"Guo","sequence":"first","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5716-9937","authenticated-orcid":false,"given":"Peng","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Qian","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Yangyang","family":"Hao","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Yue","family":"Gao","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Yue","family":"Qi","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Rongji","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Hongyan","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Mengyu","family":"Xin","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Xiaoting","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Rui","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9103-8642","authenticated-orcid":false,"given":"Hui","family":"Zhi","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"given":"Yunpeng","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4079-8945","authenticated-orcid":false,"given":"Shangwei","family":"Ning","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9794-2648","authenticated-orcid":false,"given":"Xia","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Gynecology of the First Affiliated Hospital, College of Bioinformatics Science and Technology, Harbin Medical University , Harbin 150081, China"}]}],"member":"286","published-online":{"date-parts":[[2022,10,16]]},"reference":[{"key":"2023010804224310300_B1","doi-asserted-by":"crossref","first-page":"328","DOI":"10.1038\/nature12624","article-title":"Tumour heterogeneity and cancer cell 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