Molecular Characterization of ETMRs

Study ID Alternative Stable ID Type
EGAS00001003256 Other

Study Description

ETMRs are poorly characterized embryonal brain tumors with a dismal outcome. We collected tumors from 184 ETMR patients and 23 matched recurrences to investigate the genomic landscape of this distinct entity. Tumors without C19MC amplification, the proposed driver, harbor other miRNA related aberrations like DICER1 mutations and amplifications of the MIR17-92 miRNA cluster. All tumors behave molecularly similar and no subgrouping was observed. Whole-genome sequencing revealed an overall low recurrence of SNVs, but highly prevalent R-loop associated genomic instability. Finally, we show that targeting R-loops with TOP1 and PARP inhibitors might be an effective treatment strategy for this deadly disease.

Study Datasets 7 datasets.

Click on a Dataset ID in the table below to learn more, and to find out who to contact about access to these data

Dataset ID Description Technology Samples
This dataset contains Mate Pair Sequencing data from 15 samples from 13 patients. Mate pair DNA library preparation was carried out using the Illumina MP v.2 reagents and protocol. In brief, fragmentation of genomic DNA was performed using a Hydroshear device to an insert size of 4.5 kb followed by sequencing with Illumina HiSeq 2000 instruments resulting in 30 Fastq files (paired end).
Illumina HiSeq 2000 15
This dataset contains panel sequencing data from 33 samples. Targeted sequencing was performed by creating libraries using the Agilent SureSelect XT technology. Libraries were sequenced using molecular barcode-indexed ligation-based sequencing using a NextSeq500 (Illumina) instrument. Between three and six lanes per sample have been sequenced resulting in 262 Fastq files (paired end).
NextSeq 500 33
The dataset contains two samples from one patient. As a representative FFPE tissue sample, ET174 was histologically iden- tified, targeted and microdissected with a puncher for nucleic acid extraction. RNA was extracted using the automated Maxwell system with the Maxwell 16 LEV RNA FFPE Kit (Promega), according to the manufacturer’s instructions. To evaluate FFPE RNA quality, we used the percentage of RNA fragments >200 nt fragment determination value (DV200). Only RNA samples with DV200 ... (Show More)
NextSeq 500 2
This dataset contains exome sequencing data from 21 samples. Sequencing of samples using whole-exome sequencing was per- formed by creating libraries using the IlluminaTruSeq exome enrich- ment kit following the manufacturer’s instructions after size selection. Size selection was performed by fractionation using a Covaris ultra- sonicator and subsequent selection was performed using a 1.5% gel Pippin Prep cassette (Sage Science). One lane per sample has been sequenced resulting in 42 Fastq ... (Show More)
Illumina HiSeq 2000 21
This dataset contains whole genome sequencing data from 59 samples. WGS libraries were prepared using the Illumina TruSeq Nano DNA LT Library Prep or TruSeq Nano DNA HT Library Prep Kit following the manufacturer’s instructions. In brief, 100 ng of genomic DNA was fragmented to approximately 350 bp using a Covaris ultrasonicator (Covaris). The fragmented DNA was then end-repaired, size-selected using magnetic beads, extended with an ‘A’ base on the 3′ end and ligated with TruSeq ... (Show More)
HiSeq X Ten,Illumina HiSeq 2000 59
This dataset contains miRNA-seq data from 10 patients. Small RNAs were isolated as described previously57,58 from fresh-frozen tumour material. In brief, total RNA was extracted using guanidinium isothiocyanate/phenol extraction followed by 3′-adaptor ligation of barcoded adenylated adaptors. Samples were pooled in two sets of five samples. Subsequently, gel electrophoresis was used to isolate small RNAs (19–35 nt) and purified using ethanol precipitation. Fragments were then amplified ... (Show More)
Illumina HiSeq 2000 10
This dataset contains DRIP-seq data from 2 patients. DNA–RNA hybrids were extracted from tissue derived from ETMR patient-derived xenograft (PDX) models (BT183) that were treated using topotecan or saline as described previously27. Tumours were subsequently frozen and pelleted using ultracentrifugation. DNA–RNA hybrids were extracted as described previously using the same protocol that is applied for cultured cells21. DNA was extracted using proteinase K followed by phenol–chloroform ... (Show More)
Illumina HiSeq 2000 2

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