Project description:Spatial genome organization is essential to direct fundamental DNA-templated biological processes (e.g. transcription, replication, and repair), but the 3D in situ nanometer-scale structure of accessible cis-regulatory DNA elements within the crowded nuclear environment remains elusive. Here, we combined the recently developed Assay for Transposase-Accessible Chromatin with visualization (ATAC-see), PALM super-resolution imaging and lattice light-sheet microscope (a method termed 3D ATAC-PALM) to selectively image and quantitatively analyze key features of the 3D accessible genome in single cells. 3D ATAC-PALM reveals that accessible chromatin are non-homogeneously organized into spatially segregated clusters or accessible chromatin domains (ACDs). To directly link imaging and genomic data, we optimized multiplexed imaging of 3D ATAC-PALM with Oligopaint DNA-FISH, RNA-FISH and protein fluorescence. We found that ACDs colocalize with active chromatin and enclose transcribed genes. By applying these methods to analyze genetically purterbed cells, we demonstrated that genome architectural protein CTCF prevents excessive clustering of accessible chromatin and decompacts ACDs. These results highlight the 3D ATAC-PALM as a useful tool to probe the structure and organizing mechanism of the genome.
Project description:To identify novel molecular targets for triple negative breast cancer (TNBC), we have employed whole genome microarray expression profiling. We purified 30 surgically resected breast cancer tissue diagnosed triple negative by means of immunohistochemical staining and 13 normal mammary ductal cells with lasermicrobeam microdissection system (PALM MicroBeam, Carl Zeiss MicroImaging Co., Ltd), performed whole human genome microarray, and compared gene expression levels of TNBC, normal mammary ductal cells, and normal vital organs to develop molecular targets with a minimum risk.
Project description:Towards understanding gene expression variation among related rice lineages on a genome-wide scale, we sought to assess global gene expression in the heading-stage panicle using a whole genome oligonucleotide microarray designed to represent 36,926 annotated indica genes. Using a loop-design, we interrogated gene expression patterns in six related rice lineages, including O. sativa (two Asian cultivars indica and japonica), O. nivara (Asian annual wild rice), O. rufipogon (Asian perennial wild rice) and O. glaberrima (African cultivated rice). Series_sample_order: Sample 1-12 Slide A; Sample 13-24 Slide B
Project description:H3K4me3 profiling of OSCC secondary (2ary) recipient primary tumors (PTs) following in vivo exposure to control (CTRL) or palm oil-enriched (PALM) diet in primary recipient mice
Project description:Oil palm (Elaeis guineensis) is a highly productive oil crop and the most consumed vegetable oil globally due to its unique oil characteristics. Palm oil production is affected by abiotic stresses, leading to food security issues and huge economic losses. To understand the oil palm responses to different abiotic stresses at the transcriptional level, we performed RNA-Seq analyses of oil palm leaves treated with drought, high salinity, heat, cold and flood stresses compared with controls. A total of 18 libraries (three biological replicates per treatment) were generated with approximately 843 million of total clean reads after data filtering. Clean reads were mapped to the oil palm reference genome at a total mapping rate of more than 70%. The quantification of expression analysis enabled the identification of potential abiotic stress-responsive genes, co-expressed under multiple abiotic stresses and unigenes that were induced by a specific abiotic stress. The availability of these RNA-Seq datasets will provide a better understanding of the abiotic stress response mechanisms to develop climate-resilient oil palm planting materials.
Project description:Epigenetic signatures of alm and assoication with outcome. Background: Acral melanoma (AM) is a rare, aggressive type of cutaneous melanoma (CM) with a distinct genetic profile for which comprehensive genome-wide methylation analysis (GWMA) is lacking. We aimed to identify a methylome signature distinguishing primary acral lentiginous melanoma (PALM) from primary non-lentiginous AM involving the acral sites (NALM), metastatic ALM (MALM), primary non-acral CM (PCM), and acral nevus (AN). Methods: A total of 22 PALM, 9 NALM, 10 MALM, 9 PCM, and 3 AN cases were subjected to GWMA using the Illumina Infinium Methylation EPIC array interrogating 866,562 CpG sites, and their methylomes were compared. Results: A prominent finding was that the methylation profiles of PALM and NALM were distinct, although both are considered canonical AMs. Four of the genes most differentially methylated between PALM and NALM or PALM and MALM were HHEX, DIPK2A (formerly C3orf58), NELFB (formerly COBRA1), and TEF. However, when primary AMs (PALM+NALM) were compared with MALM, IFITM1 and SIK3 were the most differentially methylated, highlighting their pivotal role in the metastatic potential of AMs. Patients with NALM had significantly worse disease-specific (DSS) and overall survival than patients with PALM. Aberrant methylation was significantly associated with aggressive clinicopathologic parameters, including greater Breslow thickness, ulceration, increased mitotic rate, and lymph node metastasis, and with worse DSS. Conclusion: Our study emphasizes the importance of distinguishing the two epigenetically distinct subtypes of AM. We also identified novel epigenetic prognostic biomarkers that may serve to risk-stratify patients with AM. These epigenetic alterations may be leveraged for development of targeted therapies.
2020-02-03 | GSE133395 | GEO
Project description:The South Asian genome: Whole Genome Sequencing