中文题名: | 染色质可及性变化参与调控ER阳性乳腺癌对内分泌疗法耐药的机制研究 |
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保密级别: | 公开 |
论文语种: | 中文 |
学科代码: | 071002 |
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学生类型: | 学士 |
学位: | 理学学士 |
学位年度: | 2022 |
学校: | 北京师范大学 |
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提交日期: | 2022-05-28 |
答辩日期: | 2022-05-18 |
外文题名: | Unravelling mechanisms of chromatin-based resistance to endocrine therapy in ER-positive breast cancer |
中文关键词: | |
外文关键词: | ER-positive breast cancer ; endocrine therapy resistance ; ATAC-seq ; CRISPR/Cas9 ; chromatin accessibility ; lineage transition |
中文摘要: |
内分泌疗法耐药是ER阳性乳腺癌治疗中的关键问题,染色质可及性变化导致耐药的机制已在多种临床前及临床实践中得到证明,ATAC-seq作为研究染色质可及性的主流技术广泛应用于本领域。本项目以靶向敲除基因X降低内分泌药物敏感度为出发点,建立并验证ATAC-seq从文库构建到数据分析的全流程方法,同时尝试借助此技术在染色质水平解释耐药机制。结果显示,X的缺失改变了染色质可及性,其中ER及其共作用因子诸如FOXA1、GATA3等的可及性显著降低,它们都参与调控ER依赖性转录过程并维持ER阳性乳腺癌的特性。综上,本项目的结果提示缺失X可能导致乳腺癌对ER及其相关通路的依赖下降,出现了谱系重编程现象,从而产生对拮抗ER的内分泌药物耐药。
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外文摘要: |
Resistance to endocrine therapy is a key issue in ER-positive breast cancer treatment. It has been demonstrated that the alteration of chromatin accessibility confers endocrine therapy resistance in various pre-clinical and clinical models. ATAC-seq is the mainstream method to profile the landscape of chromatin accessibility. This project aims to establish an integrated ATAC-seq pipeline from library construction to data analysis, and attempt to explore the chromatin-based mechanisms of gene X- knockout(KO)-mediated endocrine therapy resistance. The preliminary results show that loss of X impairs the chromatin accessibility at the loci of ER as well as its co-factors, such as FOXA1 and GATA3, all of which are key factors regulating ER-dependent transcription and determining the identity of ER-positive breast cancer. Together, these data suggest that loss of X decreases the dependence of ER in ER-positive breast cancer, which may result in cell lineage transition from ER-positive to ER-negative, thereby acquiring resistance to anti-ER drugs.
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参考文献总数: | 60 |
作者简介: | 张沛杰,北京师范大学生命科学学院2018级生物技术专业本科生 |
插图总数: | 31 |
插表总数: | 6 |
馆藏号: | 本071002/22006 |
开放日期: | 2023-05-28 |