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Genetic and transcriptional evolution alters cancer cell line drug response

机译:遗传和转录进化改变癌细胞系药物反应

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Human cancer cell lines are the workhorse of cancer research. Although cell lines are known to evolve in culture, the extent of the resultant genetic and transcriptional heterogeneity and its functional consequences remain understudied. Here we use genomic analyses of 106 human cell lines grown in two laboratories to show extensive clonal diversity. Further comprehensive genomic characterization of 27 strains of the common breast cancer cell line MCF7 uncovered rapid genetic diversification. Similar results were obtained with multiple strains of 13 additional cell lines. Notably, genetic changes were associated with differential activation of gene expression programs and marked differences in cell morphology and proliferation. Barcoding experiments showed that cell line evolution occurs as a result of positive clonal selection that is highly sensitive to culture conditions. Analyses of single-cell-derived clones demonstrated that continuous instability quickly translates into heterogeneity of the cell line. When the 27 MCF7 strains were tested against 321 anti-cancer compounds, we uncovered considerably different drug responses: at least 75% of compounds that strongly inhibited some strains were completely inactive in others. This study documents the extent, origins and consequences of genetic variation within cell lines, and provides a framework for researchers to measure such variation in efforts to support maximally reproducible cancer research.
机译:人类癌细胞系是癌症研究的主力军。尽管已知细胞系会在培养中进化,但是所产生的遗传和转录异质性的程度及其功能后果仍待研究。在这里,我们使用在两个实验室中生长的106个人类细胞系进行基因组分析,以显示广泛的克隆多样性。普通乳腺癌细胞系MCF7的27个菌株的进一步综合基因组学表征揭示了快速的遗传多样性。用13个其他细胞系的多个菌株获得了相似的结果。值得注意的是,遗传变化与基因表达程序的差异激活以及细胞形态和增殖的显着差异有关。条形码实验表明,细胞株进化是由于对培养条件高度敏感的阳性克隆选择而产生的。对单细胞来源克隆的分析表明,持续的不稳定性会迅速转化为细胞系的异质性。当对27种MCF7菌株针对321种抗癌化合物进行测试时,我们发现了相当不同的药物反应:至少75%强烈抑制某些菌株的化合物在其他菌株中完全没有活性。这项研究记录了细胞系内遗传变异的程度,起源和后果,并为研究人员提供了一个框架,以衡量这种变异以支持最大程度地再现癌症的研究。

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