Model-based analysis uncovers mutations altering autophagy selectivity in human cancer.

Model-based analysis uncovers mutations altering autophagy selectivity in human cancer.
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基于模型的分析揭示了改变人类癌症自噬选择性的突变

DOI:
10.1038/s41467-021-23539-5
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发表时间:
2021-05-31
影响因子:
16.6
通讯作者:
Jia D
Jia D
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Han Z;Zhang W;Ning W;Wang C;Deng W;Li Z;Shang Z;Shen X;Liu X;Baba O;Morita T;Chen L;Xue Y;Jia D

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自噬可以选择性地靶向蛋白质聚集体、病原体和功能失调的细胞器用于溶酶体降解。自噬的异常调节促进肿瘤的发生,但肿瘤特异性改变是否以及如何导致自噬异常尚不清楚。为了在异常自噬选择性和人类癌症之间建立联系,我们建立了一个计算管道,并在148种蛋白质中优先考虑222个潜在的LIR(LC 3相互作用区)基序相关突变(LAM)。我们验证了多种蛋白质中的LAM,包括ATG4B,STBD 1,EHMT 2和BRAF,这些蛋白质损害了它们与LC 3和自噬活性的相互作用。使用转录组学,代谢组学和其他实验测定的组合,我们表明,STBD 1,一种表征不佳的蛋白质,通过调节糖原自噬抑制肿瘤生长,而LIR上的患者来源的W203C突变废除了其癌症抑制功能。这项工作表明,改变的自噬选择性是癌细胞在各种压力下生存的常用机制,并提供了一个框架来发现影响致癌作用的其他自噬相关途径。虽然自噬与肿瘤发生有关,但尚不清楚基因组改变如何影响肿瘤中自噬的选择性。在这里,作者建立了一个整合计算和实验方法的管道,以表明改变的自噬选择性在癌细胞中很常见,并将糖原自噬与肿瘤发生联系起来。
Autophagy can selectively target protein aggregates, pathogens, and dysfunctional organelles for the lysosomal degradation. Aberrant regulation of autophagy promotes tumorigenesis, while it is far less clear whether and how tumor-specific alterations result in autophagic aberrance. To form a link between aberrant autophagy selectivity and human cancer, we establish a computational pipeline and prioritize 222 potential LIR (LC3-interacting region) motif-associated mutations (LAMs) in 148 proteins. We validate LAMs in multiple proteins including ATG4B, STBD1, EHMT2 and BRAF that impair their interactions with LC3 and autophagy activities. Using a combination of transcriptomic, metabolomic and additional experimental assays, we show that STBD1, a poorly-characterized protein, inhibits tumor growth via modulating glycogen autophagy, while a patient-derived W203C mutation on LIR abolishes its cancer inhibitory function. This work suggests that altered autophagy selectivity is a frequently-used mechanism by cancer cells to survive during various stresses, and provides a framework to discover additional autophagy-related pathways that influence carcinogenesis. Although autophagy has been linked to tumourigenesis, it is unclear how genomic alterations affect autophagy selectivity in tumours. Here, the authors establish a pipeline that integrates computational and experimental approaches to show that altered autophagy selectivity is frequent in cancer cells and link glycogen autophagy with tumourigenesis.
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