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Discovery of cis-spliced chimeric RNAs between adjacent genes in human prostate cells

ABSTRACT: Total RNA extracted from prostate cancer LNCaP cells transfected with siRNA against CTCF(siCTCF), or negative control siRNA (si-)were processed, and sequenced by two different companies using Illumina Hi-seq 2000 platform to generate RNA sequencing with two output sequences: paired-end 50bp and 101bp in read length. Nearly 100 million and 50 million raw reads were yielded from each sample respectively. We used FastQC to confirm the quality of raw fastq sequencing data, and SOAPfuse software to detect fusion transcripts.

ORGANISM(S): Homo sapiens

PROVIDER: GSE63487 | GEO | 2015/02/09

SECONDARY ACCESSION(S): PRJNA268024

REPOSITORIES: GEO

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Discovery of cis-spliced chimeric RNAs between adjacent genes in human prostate cells

Project description:Total RNA extracted from prostate cancer LNCaP cells transfected with siRNA against CTCF(siCTCF), or negative control siRNA (si-)were processed, and sequenced by two different companies using Illumina Hi-seq 2000 platform to generate RNA sequencing with two output sequences: paired-end 50bp and 101bp in read length. Nearly 100 million and 50 million raw reads were yielded from each sample respectively. We used FastQC to confirm the quality of raw fastq sequencing data, and SOAPfuse software to detect fusion transcripts. Discovering fusion genes from siCTCF and si- in LNCaP cells.

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Detection and analysis of spliced chimeric mRNAs in sequence databanks.

Project description:We have developed a databank screening procedure, the In Silico Trans-splicing Retrieval System (ISTReS), to identify heterologous, spliced mRNAs with potential origin from chromosomal translocations, mRNA trans-splicing and multi-locus transcription. A parsing algorithm to screen cDNA versus genome Blast outputs was implemented. Key filtering criteria were Blast scores of > or =300, match lengths of > or =95% of the query sequences, junction of the two partners at exon-exon borders and concordant 'sense/sense' reading orientation. ISTReS was validated by the successful identification of bona fide chromosomal translocation-derived fusion transcripts in the HGI and RefSeq databanks. The performance of ISTReS was verified against recently identified chimeric antisense transcripts, where it revealed essentially no independent proof of antisense transcription and absence of exon-exon borders at the chimeric join, consistent with an artefactual origin. Analysis of the UNIGENE database revealed 21 742 chimeric sequences overall that correspond to approximately 1% of the database transcripts. Novel FOP-Rho GAP and methionyl tRNA synthetase-advillin chimeric mRNAs with the canonical features of heterologous-genes spliced-transcripts were identified among 246 chimeras from the RefSeq databank. This suggests a frequency of canonically-spliced chimeras of approximately 1% of all the hybrid sequences in current databanks. These findings demonstrate the efficiency of ISTReS and the overall feasibility of sequence/structure-based strategies to search for chimeric mRNAs candidate to derive from the splicing of heterologous transcripts.

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Ontogenic changes in hematopoietic hierarchy determine pediatric specificity and disease phenotype in fusion oncogene-driven myeloid leukemia-ATACseq

Project description:ATACseq analyses between iEG (ETO2-GLIS2) and CTRL fetal primary cells and myeloid or CD41 iEG cells lines. Briefly, cells were isolated from iEG mice and cultured for 24 hours in RPMI supplemented with 10% FBS, cytokines (mIL3, mIL6, mSCF, mTPO, mFLT3l) and 100 ng/ml Doxycyclin. After cell lysis, transposition and purification step, the transposed DNA fragments were amplified by polymerase chain reaction (PCR) between 12 and 18 depending on the number of cells at the beginning (50,000 to 6,000) using adapters from the Nextera index kit (illumina). PCR purification was performed using Agencourt AMPure XP magnetic beads (Beckman Coulter A63880) in order to remove large fragments and remaining primers. Library quality was assessed using an Agilent 2100 Bioanalyzer using a High Sensitivity DNA chip (Agilent Technologies 5067-4626). Libraries were sequenced using Novaseq-6000 sequencer (Illumina) (50bp paired-end reads). Quality control of reads was performed using FastQC 0.11.7 and multiQC 1.5. The reads were aligned to the reference genome mm10 with bwa (aln 0.7.17). After alignment, we removed reads mapping to the mitochondrial genome, PCR duplicate reads and reads with a mapping quality lower than 20 using samtools (v 1.9). Final read counts for all mouse datasets ranged from 37 to 128 million reads. Mapped reads were normalized to bins per million (BPM) and were converted to bigwig format using deeptools (v3.2.0). Peak calling, differential analysis, annotation and motif analysis was performed using macs2 (V 2.1.2), Diffbind R package (v 2.8.0 in R-3.5.1 with threshold log2(1.5)), and homer (v4.10.4, annotatePeak.pl and findMotifsGenome.pl) respectively.

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