湯富酬/付衛合作揭示結直腸癌的普遍基因組改變
作者:
小柯機器人發布時間:2020/10/25 22:01:18
北京大學湯富酬、付衛等研究人員合作利用單細胞多組學測序,揭示出人類結直腸癌腫瘤基質細胞中普遍的基因組改變。這一研究成果於2020年10月22日在線發表在國際學術期刊《癌細胞》上。
研究人員表示,腫瘤微環境(TME)中的基質細胞被結直腸癌(CRC)轉化到何種程度尚未得到研究。
為了剖析這些非惡性細胞的變化,研究人員對21例微衛星穩定的CRC和6名無癌的老年患者進行了單細胞多組學測序。令人驚訝的是,體細胞拷貝數改變(SCNA)在TME和每位個體正常組織中的免疫細胞、成纖維細胞和內皮細胞中普遍存在。此外,腫瘤中SCNA的成纖維細胞比例(11.1%–47.7%)遠高於鄰近正常組織的比例(1.1%–10.6%),其中第7號染色體的增益顯著富集在TME中,並清楚地表明了克隆擴增。
此外,五個基因(BGN、RCN3、TAGLN、MYL9和TPM2)被鑑定為成纖維細胞特異性的生物標誌物,其預後較差。這項研究提供了CRC中TME基質細胞中普遍基因組改變的證據和功能相關性。
附:英文原文
Title: Single-Cell Multiomics Sequencing Reveals Prevalent Genomic Alterations in Tumor Stromal Cells of Human Colorectal Cancer
Author: Yuan Zhou, Shuhui Bian, Xin Zhou, Yueli Cui, Wendong Wang, Lu Wen, Limei Guo, Wei Fu, Fuchou Tang
Issue&Volume: 2020-10-22
Abstract: To what extent stromal cells in the tumor microenvironment (TME) are transformed bycolorectal cancer (CRC) cells is unexplored. To dissect alterations in these non-malignantcells, we performed single-cell multiomics sequencing of 21 patients with microsatellite-stableCRCs and 6 cancer-free, elderly individuals. Surprisingly, somatic copy number alterations(SCNAs) are prevalent in immune cells, fibroblasts, and endothelial cells in boththe TME and the normal tissues of each individual. Moreover, the proportions of fibroblastswith SCNAs in tumors (11.1%–47.7%) are much higher than those in adjacent normal tissues(1.1%–10.6%), with gain of chromosome 7 strongly enriched in the TME, clearly indicatingclonal expansion. Furthermore, five genes (BGN, RCN3, TAGLN, MYL9, and TPM2) are identified as fibroblast-specific biomarkers of poorer prognosis of CRC. Ourstudy provides evidence and functional relevance of pervasive genomic alterationsin the stromal cells of TME in CRC.
DOI: 10.1016/j.ccell.2020.09.015
Source: https://www.cell.com/cancer-cell/fulltext/S1535-6108(20)30489-X