Acute expression of human APOBEC3B in mice results in RNA editing and lethality.

Acute expression of human APOBEC3B in mice results in RNA editing and lethality.
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DOI:
10.1186/s13059-023-03115-4
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发表时间:
2023-11-24
期刊:
影响因子:
12.3
通讯作者:
--
中科院分区:
生物学1区
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--
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RNA编辑被描述为促进遗传异质性,导致包括癌症在内的多种疾病的发展。胞嘧啶脱氨酶APOBEC3B通过DNA突变参与肿瘤的进化,但它是否也具有RNA编辑酶的功能还没有研究。在这里,我们设计了一个新的多西环素诱导的人APOBEC3B过表达的小鼠模型,以了解这种酶在组织动态平衡中的影响,并解决在C-to-U RNA编辑中的潜在作用。持续升高的APOBEC3B水平会导致小鼠细胞健康迅速改变,主要器官功能障碍,并最终致死。重要的是,表达高水平APOBEC3B的小鼠组织的RNA测序确定了频繁的UCC到UUC RNA编辑事件,这些事件在相应的基因组DNA中并不明显。这项工作首次发现了APOBEC3B在RNA编辑中依赖脱氨酶的新功能,并提供了一个临床前工具,以帮助理解APOBEC3B作为癌症发生驱动因素的新角色。网上版载有补充材料,可在10.1186/s13059-023-03115-4查阅。
RNA editing has been described as promoting genetic heterogeneity, leading to the development of multiple disorders, including cancer. The cytosine deaminase APOBEC3B is implicated in tumor evolution through DNA mutation, but whether it also functions as an RNA editing enzyme has not been studied. Here, we engineer a novel doxycycline-inducible mouse model of human APOBEC3B-overexpression to understand the impact of this enzyme in tissue homeostasis and address a potential role in C-to-U RNA editing. Elevated and sustained levels of APOBEC3B lead to rapid alteration of cellular fitness, major organ dysfunction, and ultimately lethality in mice. Importantly, RNA-sequencing of mouse tissues expressing high levels of APOBEC3B identifies frequent UCC-to-UUC RNA editing events that are not evident in the corresponding genomic DNA. This work identifies, for the first time, a new deaminase-dependent function for APOBEC3B in RNA editing and presents a preclinical tool to help understand the emerging role of APOBEC3B as a driver of carcinogenesis. The online version contains supplementary material available at 10.1186/s13059-023-03115-4.
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