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• Mapping Genotypes to Chromatin Accessibility Profiles in Single Cells

  In somatic tissue differentiation, chromatin accessibility changes govern priming and precursor commitment towards cellular fates1–3. Therefore, somatic mutations likely alter chromatin accessibility patterns, as they disrupt differentiation topologies leading to abnormal clonal outgrowth. However, defining the impact of somatic mutations on the epigenome in human samples is challenging due to admixed mutated and wild-type cells. To chart how somatic mutations disrupt epigenetic landscapes in human clonal outgrowths, we developed Genotyping of Targeted loci with single-cell Chromatin Accessibility (GoT-ChA). This high-throughput platform links genotypes to chromatin accessibility at single-cell resolution, across thousands of cells within a single assay. We applied GoT-ChA to CD34+ cells from myeloproliferative neoplasm (MPN) patients with JAK2V617F-mutated hematopoiesis.

  Study EGAS50000000164

• The Cancer Dependency Map (DepMap)

  The Cancer Dependency Map (DepMap) aims to accelerate precision cancer medicine by creating a comprehensive map of tumor vulnerabilities. The DepMap project genomically profiles a wide range of cancer models and characterizes them for their sensitivity to genetic and compound perturbations. The data is computationally analyzed to create a systematic overview of the genetic dependencies and compound sensitivities of cancer types and the predictive biomarkers that point to patient populations most likely to benefit from targeting of these vulnerabilities. The DepMap public portal has become a comprehensive resource to identify cancer vulnerabilities by providing datasets at scale, cutting-edge computational tools, and sophisticated visualization tools that together have accelerated the discovery of novel targets and biomarkers. Please visit Depmap.org to access the public portal.

  Study phs003444

• Genomics of Glomerular Disorders

  The purpose of the "Genomics of Glomerular Disorders" study is to identify genetic contributions to primary glomerulopathies. This repository includes a total of N = 4,238 patients with a kidney biopsy diagnosis of a primary glomerular disorder across the following categories: focal segmental glomerulosclerosis (FSGS, N = 583), Henoch-Schönlein purpura nephritis (HSPN, N = 403), IgA nephropathy (IgAN, N = 1,555), membranous nephropathy (MN, N = 1,003), and minimal change disease (MCD, N = 694). The dataset includes a total of 2,290 patients recruited into the Cure Glomerulonephropathy (CureGN) study and another 1,948 patients from the Columbia University CKD Biobank (i.e., non-CureGN patients). The sample sizes by phenotype are counted based on enrollment diagnoses. The repository includes 3,958 WGS samples and 2,129 RNA-seq samples.

  Study phs002480

• RNAseq samples of patients with anti-PD-1 resistant HNSCC from a non-randomized, open-label phase 1b clinical trial

  Immune checkpoint blockade (ICB) is an effective treatment for a subset of patients with head and neck squamous cell carcinoma (HNSCC); however, the majority remain refractory. In a nonrandomized, open-label Phase 1b clinical trial, participants with recurrent and/or metastatic (R/M) HNSCC who had progressed on ICB were treated with low-dose 5-azacytidine (5-aza) daily for either 5 or 10 days, in combination with durvalumab and tremelimumab. The primary objective was to determine the biologically effective dose of 5-aza. In this study, RNA sequencing (RNA-seq) was performed on baseline and on-treatment samples from eight participants, and transcriptomic changes were analyzed to assess the impact of low-dose 5-aza treatment.

  Study EGAS50000000728

• WES samples of patients with anti-PD-1 resistant HNSCC from a non-randomized, open-label phase 1b clinical trial

  Immune checkpoint blockade (ICB) is an effective treatment for a subset of patients with head and neck squamous cell carcinoma (HNSCC); however, the majority remain refractory. In a nonrandomized, open-label Phase 1b clinical trial, participants with recurrent and/or metastatic (R/M) HNSCC who had progressed on ICB were treated with low-dose 5-azacytidine (5-aza) daily for either 5 or 10 days, in combination with durvalumab and tremelimumab. The primary objective was to determine the biologically effective dose of 5-aza. In this study, whole exome sequencing (WES) was performed on baseline samples from 12 participants, and genomic alterations were analyzed to access the genetic background of these participants.

  Study EGAS50000000729

• Health Effects of Arsenic Longitudinal Study

  The Health Effects of Arsenic Longitudinal Study (HEALS), a multidisciplinary and large prospective cohort study in Araihazar, Bangladesh, was established to evaluate the effects of full-dose range arsenic (As) exposure on various health outcomes. We applied array-based genotyping technologies to baseline DNA samples from a subset of the HEALS study and linked those genotypes to data on arsenic species measured in urine. We used these data to identify regions influencing arsenic metabolism (AS3MT and FTCD). We also applied array-based DNA methylation technologies to baseline DNA samples from a subset of individuals from HEALS. These data were linked to data on arsenic concentration (in both urine and drinking water) to identify regions of the genome where DNA methylation is impacted by arsenic exposure.

  Study phs003839

• Multi-omics profiling identifies two epithelioid sarcoma molecular subtypes with distinct signaling and immune characteristics

  Epithelioid sarcoma (EpS) is an aggressive sarcoma, characterized by the loss of SMARCB1 expression. EpS is traditionally classified as distal or proximal according to clinicopathological features, but its molecular characteristics remain largely unknown. To establish an EpS molecular classification and uncover determinants of inter- and intra-patient heterogeneity in EpS, we used multi-omics profiling and integrated the genomic, transcriptional and methylome landscapes with single-cell RNA sequencing on fresh samples as well as spatial transcriptomics. We identified two molecular subtypes of EpS: “distal-like” and “proximal-like”, which were distinct from the histological subtypes. Distal-like tumors include all morphological distal subtypes and a subset of proximal and hybrid EpS. They express a specific molecular single-cell derived epithelial-to-mesenchymal transition signature, which associates with improved patient survival and includes Desmoglein 2 (DSG2), which we identify as a potential routine immunohistochemical biomarker to improve diagnosis. Distal-like EpS also display increased peri-tumoral CD8+ T cell infiltrates and specific tumor-immune cell interactions. Conversely, proximal-like EpS harbor a higher inter-tumoral molecular heterogeneity with some cases resembling other SMARCB1-deficient tumors by DNA methylation profiling, and increased intra-tumoral pro-tumoral macrophage infiltrates. Our study introduces a novel molecular classification of EpS with prognostic value, associated diagnostic biomarkers and distinct tumor immune microenvironments, which extends beyond traditional clinicopathological classification. This paves the way for precision medicine-based therapeutic strategies for patients with EpS.

  Dac EGAC50000000552

• APOBEC Mutagenesis, Kataegis, Chromothripsis in EGFR-Mutant Osimertinib-Resistant Lung Adenocarcinomas

  Expanding on studies investigating apolipoprotein B mRNA-editing enzyme, catalytic polypeptide-like (APOBEC) mutagenesis in histological transformation of epidermal growth factor receptor (EGFR)-mutant lung cancers, it has been hypothesized that mutational signature analysis may help better understand acquired resistance to targeted therapies. Using mutational signature analysis in Receptor Tyrosine Kinase (RTK) driven lung adenocarcinomas, more specifically EGFR mutant lung cancer, APOBEC dominant mutational signatures were noted more frequently in subclonal post Tyrosine Kinase Inhibitor (TKI) treatment biospecimen samples and in the presence of large-scale genomic rearrangements. This is hypothesized to be due to the pressure of treatment with TKIs; a fact that should be further explored and can be potentially manipulated in order to overcome drug resistance.

  Study phs003812

• Establishment and genomic analysis of mixed phenotypic acute leukemia cell lines

  Among acute leukemias, mixed phenotype acute leukemias (MAPL; mixed phenotype acute leukemiae), which have both acute myeloid and acute lymphocytic leukemia traits, are generally considered resistant to chemotherapy, especially those with t(9;22) MPAL has a poorer prognosis than other forms of MPAL and is a challenge to overcome. MPAL accounts for less than 1% of all acute leukemias, and the rarity of this disease makes it difficult to conduct clinical studies to develop treatments for the disease. Therefore, we planned to establish cell lines based on acute leukemia cells (JMPAL-1) obtained from MPAL patients, and to analyze information such as gene mutations related to disease development based on these cell lines for therapeutic purposes.

  Study JGAS000721

• Investigation of a method for generating cells for regenerative medicine using comprehensive nucleic acid analysis of iPS cell-derived cardiomyocytes.

  Regenerative medicine for heart failure is expected to restore cardiac function by using human iPS cells (hiPSCs). In our laboratory, it was shown that transplantation of cardiomyocytes (CMs) derived from hiPSCs into a pig model of myocardial infarction improves the disease condition. However, the instability of differentiation efficiency and tumorigenicity after transplantation are still issues to be resolved. We attempt to identify and analyze the genes and DNA methylation associated with the induction of differentiation of hiPSCs into CMs with the aim of achieving stable induction of CMs differentiation. Furthermore, we aim to analyze genes involved in tumorigenesis in CMs, and to develop a predictive marker for tumorigenesis to ensure the safety of cells before transplantation.

  Study JGAS000665