Project description:We developed a low input, low sequencing depth method, EpiMethylTag that combines ATAC-seq or ChIP-seq (M-ATAC or M-ChIP) with bisulfite conversion, to simultaneously examine accessibility/TF binding and methylation on the same DNA.
2019-10-01 | GSE129673 | GEO
Project description:Low depth genome sequencing of Hui nationality in China
Project description:Primary objectives: The primary objective is to investigate circulating tumor DNA (ctDNA) via deep sequencing for mutation detection and by whole genome sequencing for copy number analyses before start (baseline) with regorafenib and at defined time points during administration of regorafenib for treatment efficacy in colorectal cancer patients in terms of overall survival (OS).
Primary endpoints: circulating tumor DNA (ctDNA) via deep sequencing for mutation detection and by whole genome sequencing for copy number analyses before start (baseline) with regorafenib and at defined time points during administration of regorafenib for treatment efficacy in colorectal cancer patients in terms of overall survival (OS).
Project description:To interrogate single-base resolution 6mA sites in the genome-wide, we develop DA-6mA-seq (DpnI-Assisted N6-methylAdenine sequencing), an optimized sequencing method taking advantage of restriction enzyme DpnI, which exclusively cleaves methylated adenine sites. We find DpnI also recognizes other sequence motifs besides the canonical GATC restriction sites, largely expanding the application range of this method. DA-6mA-seq requires less starting material and lower sequencing depth than previous methods, but achieves higher sensitivity, providing a good strategy to identify 6mA in large genome with a low abundance of 6mA. We rebuild the 6mA maps of Chlamydomonas by DA-6mA-seq and then apply this method to another two eukaryotic organisms, Plasmodium and Penicillium. Further analysis reveals most 6mA sites are symmetric at various sequence contexts, suggesting 6mA may function as a new heritable epigenetic mark in eukaryotes. A new sequencing method is developed to detect 6mA in eukaryotes
Project description:Low-pass sequencing (sequencing a genome to an average depth less than 1× coverage) combined with genotype imputation has been proposed as an alternative to genotyping arrays for trait mapping and calculation of polygenic scores. To empirically assess the relative performance of these technologies for different applications, we performed low-pass sequencing (targeting coverage levels of 0.5× and 1×) and array genotyping (using the Illumina Global Screening Array (GSA)) on 120 DNA samples derived from African and European-ancestry individuals that are part of the 1000 Genomes Project. We then imputed both the sequencing data and the genotyping array data to the 1000 Genomes Phase 3 haplotype reference panel using a leave- one-out design. We evaluated overall imputation accuracy from these different assays as well as overall power for GWAS from imputed data, and computed polygenic risk scores for coronary artery disease and breast cancer using previously derived weights. We conclude that low-pass sequencing plus imputation, in addition to providing a substantial increase in statistical power for genome wide association studies, provides increased accuracy for polygenic risk prediction at effective coverages of ∼ 0.5× and higher compared to the Illumina GSA.
Project description:Plutella xylostella is the major cosmopolitan pest of brassica and other crucifer crops,the larval midgut of which is a dynamic organ that interfaces with a diversearray of physiological and toxicological processes.The draft sequence of the P.xylostella genome was recently released,but its annotation remains chanllenging because of the low coverage of this branch of life.Peptide sequencing by computational assignment of tandem mass spectra to a database of putative protein sequences provides an independent approach to confirm or refute protein prediction,which has been termed proteogenomics.In this study,we carried out an in-depth proteogenomic analysis using shotgun HPLC-ESI-MS/MS approach with a multi-algorithme peipline to complement genome annotation in the P.xylostella larval midgut.
Project description:Plutella xylostella is the major cosmopolitan pest of brassica and other crucifer crops,the larval midgut of which is a dynamic organ that interfaces with a diversearray of physiological and toxicological processes.The draft sequence of the P.xylostella genome was recently released,but its annotation remains chanllenging because of the low coverage of this branch of life.Peptide sequencing by computational assignment of tandem mass spectra to a database of putative protein sequences provides an independent approach to confirm or refute protein prediction,which has been termed proteogenomics.In this study,we carried out an in-depth proteogenomic analysis using shotgun HPLC-ESI-MS/MS approach with a multi-algorithme peipline to complement genome annotation in the P.xylostella larval midgut.
Project description:Plutella xylostella is the major cosmopolitan pest of brassica and other crucifer crops,the larval midgut of which is a dynamic organ that interfaces with a diversearray of physiological and toxicological processes.The draft sequence of the P.xylostella genome was recently released,but its annotation remains chanllenging because of the low coverage of this branch of life.Peptide sequencing by computational assignment of tandem mass spectra to a database of putative protein sequences provides an independent approach to confirm or refute protein prediction,which has been termed proteogenomics.In this study,we carried out an in-depth proteogenomic analysis using shotgun HPLC-ESI-MS/MS approach with a multi-algorithme peipline to complement genome annotation in the P.xylostella larval midgut.
