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Long-read sequencing for cell-free DNA analysis (human pacbio)

ABSTRACT: 8 pregnant women at the 3rd trimesters, 4 hepatitis B carriers, and 4 patients with hepatocellular carcinoma

PROVIDER: EGAS00001006609 | EGA |

REPOSITORIES: EGA

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041c8544-f048-4582-89a7-50f7e5aceaaa - samples

Project description:8 pregnant women at the 3rd trimesters, 4 hepatitis B carriers, and 4 patients with hepatocellular carcinoma

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Long-read sequencing for cell-free DNA analysis (human)

Project description:In this study, we compared the two long-read sequencing platforms, namely the single-molecule real-time sequencing by Pacific Biosciences and nanopore sequencing by Oxford Nanopore Technologies, for the analysis of cell-free DNA from plasma. Cell-free DNA from plasma samples of 31 pregnant women at different trimesters, 6 hepatitis B carriers, and 8 patients with hepatocellular carcinoma were sequenced with the two platforms.

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5f9e6e77-d05c-45db-aa5c-697078543db5 - samples

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2019-03-04 | GSE78904 | GEO

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HSV1 transcriptosome analysis by PAcBio long read sequencing

Project description:In this study, we used the amplified isoform sequencing technique from Pacific Biosciences to characterize the poly(A) fraction of the lytic transcriptome of the herpes simplex virus type 1 (HSV-1). Our analysis detected 34 formerly unidentified protein-coding genes, 10 non-coding RNAs, as well as 17 polycistronic and complex transcripts. This work also led us to identify many transcript isoforms, including 13 splice and 68 length variants, as well as several transcriptional overlaps. Additionally, we determined previously unascertained transcriptional start and polyadenylation sites. We analyzed the transcriptional activity from the complementary DNA strand in five convergent HSV gene pairs with quantitative RT-PCR and detected antisense RNAs in each gene. This part of the study revealed an inverse correlation between the expressions of convergent partners. Our work adds new insights for understanding the complexity of the pervasive transcriptional overlaps by suggesting that there is a crosstalk between adjacent and distal genes through interaction between their transcription apparatuses. We also identified transcripts overlapping the HSV replication origins, which may indicate an interplay between the transcription and replication machineries. The relative abundance of HSV-1 transcripts has also been established by using a novel method based on the calculation of sequencing reads for the analysis.

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Affymetrix SNP6.0 array data for different clinical outcomes of HBV infection

Project description:Chronic hepatitis B virus (HBV) infection is a serious global public health problem. To identify susceptibility loci for disease progression of HBV infection, we performed this genome-wide association study using DNA pools of case and control constructed by progressed HBV carriers (acute liver failure, liver cirrhosis, hepatocellular carcinoma) and asymptomatic HBV carriers separately. Performing GWAS on pools of DNA samples is an effective strategy to reduce the costs of studies and pooling DNA has been shown to be an efficient method to select candidate susceptibility loci for follow-up by individual genotyping. Affymetrix Genome-Wide Human Mapping SNP6.0 Arrays were performed for DNA pools, which were constructed by pooling 120 ng DNA from each participant. Four independent pools were created: case A was acute liver failure group (n = 86), case B was liver cirrhosis group (n = 88), case C was hepatocellular carcinoma group (n = 90) and case D was asymptomatic HBV carriers (n = 66) that was considered as control. Twelve chips (each pool was replicated in triplicate) were finished according to the manufacturer's instruction.

2013-12-10 | E-GEOD-26034 | biostudies-arrayexpress

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