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Mammalia

ABSTRACT: RNA sequencing of TN Drosha-transfected human and mouse cell lines

PROVIDER: PRJNA282167 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1996500_1.fastq.gz	Fastqsanger.gz
	SRR1996500_2.fastq.gz	Fastqsanger.gz
	SRR1999740_1.fastq.gz	Fastqsanger.gz
	SRR1999740_2.fastq.gz	Fastqsanger.gz
	SRR1999880_1.fastq.gz	Fastqsanger.gz

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Mammalia

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Loss or oncogenic mutation of DROSHA impairs kidney development and function, but is not sufficient for Wilms tumor formation

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Project description:Blastemal histology in chemotherapy-treated pediatric Wilms tumors (nephroblastoma) is associated with adverse prognosis. To uncover the underlying tumor biology and find novel therapeutic leads for this subgroup of patients, we analyzed 58 blastemal-type Wilms tumors by exome and transcriptome sequencing and validated our findings in a large independent replication cohort. Recurrent mutations identified either somatically or in the germline included a hotspot mutation (Q177R) in the homeodomain of SIX1 and SIX2 in tumors with high proliferative potential, mutations in microprocessor genes like DROSHA, DGCR8, DICER1 and DIS3L2, and alterations in IGF2, MYCN, and TP53, the latter being strongly associated with dismal outcome. DROSHA and DGCR8 mutations had a strong effect on miRNA expression patterns in tumors, which was functionally validated in cell lines transfected with mutant DROSHA.

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Project description:Targeting Bowel Tissue for Drug Delivery System by Human and Mouse GPA33 Cross-Reactive Fully Human Antibody

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Project description:MicroRNAs (miRNAs) are a class of small noncoding RNAs about 22-nucleotide (nt) in length that collectively regulate more than 60% of coding genes. Aberrant miRNA expression is associated with numerous diseases, including cancer. miRNA biogenesis is licensed by the ribonuclease (RNase) III enzyme Drosha, the regulation of which is critical in determining miRNA levels. We and others have previously revealed that alternative splicing regulates the subcellular localization of Drosha. To further investigate the alternative splicing landscape of Drosha transcripts, we performed PacBio sequencing in different human cell lines. We identified two novel isoforms resulting from partial intron-retention in the region encoding the Drosha catalytic domain. One isoform (AS27a) generates a truncated protein that is unstable in cells. The other (AS32a) produces a full-length Drosha with a 14 amino acid insertion in the RIIID domain. By taking advantage of Drosha knockout cells in combination with a previously established reporter assay, we demonstrated that Drosha-AS32a lacks cleavage activity. Furthermore, neither Drosha-27a nor Drosha-32a were able to rescue miRNA expression in the Drosha knockout cells. Interestingly, both isoforms were abundantly detected in a wide range of cancer cell lines (up to 15% of all Drosha isoforms). Analysis of the RNA-seq data from over 1000 breast cancer patient samples revealed that the AS32a is relatively more abundant in tumors than in normal tissue, suggesting that AS32a may play a role in cancer development.

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