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Regulation of P53 signaling in breast cancer by the E3 ubiquitin ligase RNF187

ABSTRACT: Regulation of P53 signaling in breast cancer by the E3 ubiquitin ligase RNF187

PROVIDER: PRJNA758805 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR15667261.fastq.gz	Fastqsanger.gz
	SRR15667262.fastq.gz	Fastqsanger.gz
	SRR15667263.fastq.gz	Fastqsanger.gz
	SRR15667264.fastq.gz	Fastqsanger.gz
	SRR15667265.fastq.gz	Fastqsanger.gz

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Regulation of P53 signaling in breast cancer by the E3 ubiquitin ligase RNF187

Project description:The tumor suppressor P53 plays critical roles in prohibiting cancer. P53 is rarely mutated and still functional in luminal types of breast cancer. According to current knowledge, wild type P53 function is tightly controlled by post-translational modification, such as ubiquitination. Several ubiquitin ligases were shown to regulate P53 ubiquitination and protein stability. Here, we report RNF187, a RING family ubiquitin ligase, facilitates breast cancer growth and inhibits apoptosis via modulating P53 signaling. RNF187 is elevated in breast cancer and correlates with breast cancer survival only in P53 wild type groups. The bio-informatics analysis shows that RNF187 negatively correlates P53 target gene expression, such as IGFBP3 and FAS in breast cancer. RNF187 depletion inhibits breast cancer growth and facilitates cell death. RNA sequencing analysis indicates that RNF187 could be an important modifier for P53 signaling. Further experiments show that RNF187 interacts with P53 and promotes P53 degradation via facilitating P53 poly-ubiquitination in breast cancer cells. Interesting, the in vitro ubiquitin assay shows that RNF187 could directly ubiquitinate P53, which is independent of MDM2. These finding reveals a novel direct P53 regulator and a potential therapeutic target for breast cancer.

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Project description:It has been recognized that BRCA1, in the form of the BRCA1/BARD1 heterodimer, acting as an ubiquitin E3 ligase offered a possible mechanism to explain its pleiotrophic nature of BRCA1 activity. Our observation that mice lacking BRCA1 enzymatic activity are viable apart from male sterility was unexpected. Our results suggest that the E3 ligase activity of BRCA1 is largely dispensable for normal development and is not essential for all BRCA1 functions. Thus, many of the known and unknown functions of BRCA1 are likely to be mediated independent of its ability to catalyze ubiquitination. The genome copy number patterns were studied on the mice tumors that lacks E3 ubiqitin ligase activity of BRCA1 and were compared to copy number profile of mice lacking p53 and both brca1 and p53. Array CGH was performed using Agilent mouse CGH microarray 244K kit. Genomic DNA isolated from tumor tissue and its corresponding mouse tail were labelled with two different dyes and hybridized simultaneously on to microarray slides to perform comparitive genomic hybridization.

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