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• Discovery of Novel Melanoma Predisposing Mutations by Exome Sequencing

  Melanoma risk shows clear heritability, but the inherited genetic factors remain largely unknown. Rare high risk mutations in CDKN2A, CDK4, BAP1 and TERT have been described but these variants, in aggregate, account for less than 50% of the kindreds reporting a family history of melanoma. This project will seek to identify new genes which may confer melanoma susceptibility. Identifying melanoma predisposing mutations can provide new biological insights and may impact important clinical decision making regarding treatment, surveillance and preventive approaches. Hereditary melanoma patients (defined as those individuals with multiple primary melanomas and those patients with a family history of melanoma) were collected from melanoma clinics at the Massachusetts General Hospital in Boston and the A. Sygrous Hospital in Athens, Greece. All exome sequencing was performed at the Broad Institute of Harvard and MIT; samples sequence capture was performed using Agilent SureSelect Human All Exon Kit v2 and sequencing was performed on an Illumina HiSeq 2000 or 2500.

  Study phs000823

• BarcUVa-Seq (Biology of Colorectal Cancer Risk Enhancers)

  This study was designed to generate a cohort of normal colon mucosal biopsies from the "average risk" population. Its primary aims included the development of an RNA-seq dataset of normal colon mucosal biopsies across three colon regions (ascending, transverse and descending). Further, we aimed to provide plausible prioritization to genetic components of colorectal cancer risk by employing methods such as expression quantitative trait loci analysis. In doing so, we provide a novel reference dataset for the study of colon cancer risk in the healthy colon epithelium. RNA-seq was performed in batches on an Illumina HiSeq 2500 (batch 1-7) or NovaSeq 6000 (batch 8) on a total of 463 samples. Matched genotyping data was generated on the Illumina OncoArray BeadChip. Phasing was carried out using Minimac 3 and imputation was performed using The Haplotype Reference Consortium panel on the Michigan Imputation Server.Genotype and RNA-seq data will be made available in dbGaP.

  Study phs003338

• Structure of the Mucosal and Stool Microbiome in Lynch Syndrome

  The gut microbiota has been associated with colorectal cancer (CRC), but causal alterations preceding CRC have not been elucidated. To prospectively assess microbiome changes prior to colorectal neoplasia, we investigated samples from 100 Lynch syndrome patients using 16S rRNA gene sequencing of colon biopsies, coupled with metagenomic and metatranscriptomic sequencing of feces. Colectomy and CRC history represented the largest effects on microbiome profiles. A subset of Clostridiaceae were depleted in stool corresponding with baseline adenomas, while Desulfovibrio was enriched in both stool and mucosal biopsies. A classifier leveraging stool metatranscriptomes resulted in modest power to predict interval development of preneoplastic colonic adenoma. Predictive transcripts corresponded with a shift in flagellin contributors and oxidative metabolic microenvironment, potentially factors in local CRC pathogenesis. This suggests that the effectiveness of prospective microbiome monitoring for adenomas may be limited but supports the potential causality of these consistent, early microbial changes in colonic neoplasia.

  Study phs002343

• Deciphering craniopharyngioma subtypes: Single-cell analysis of tumor microenvironment and immune networks

  Craniopharyngiomas, including both adamantinomatous (ACP) and squamous papillary (PCP) types, present significant challenges in treatment due to their proximity to critical pituitary structures. In this study, we conducted a single-cell RNA analysis to examine the tumor microenvironments (TME) of ACP and PCP. Single-cell clustering revealed a wide range of cell types, which were further categorized based on gene expression patterns. For ACP, these categories included developing epithelia, calcification, and immune response, while PCP showed developing epithelia, cell cycle, and immune response as prominent categories. Subclustering analysis unveiled different types of immune cells in both ACP and PCP TMEs, with specific patterns of immune responses. Interestingly, smaller tumors were associated with particular immune cell ratios. Furthermore, we identified specific cell-to-cell interactions within the tumor cells. In conclusion, our study has led to the development of a comprehensive cell atlas, shedding light on the molecular characteristics and intricate interplay of immune cells within the TMEs of ACP and PCP.

  Study JGAS000722

• Single Cell Transcriptional Analysis of Human Adenoids Identifies Molecular Features of Airway Microfold Cells

  We aimed to characterize the cellular composition and molecular features of the human adenoid, a mucosa-associated lymphoid tissue located in the upper airway, with a focus on epithelial populations involved in immune surveillance. To this end, we performed single-nucleus RNA sequencing (snRNA-seq) on adenoid tissue obtained from 6 human donors (age 2 – 14; 3 males and 3 females) undergoing routine adenoidectomy. The donor cohort includes clinically annotated samples with no known immunodeficiency or chronic airway disease.Our analysis uncovered distinct epithelial populations, including transcriptionally defined immature and mature microfold (M) cells, and a previously unrecognized interferon-stimulated epithelial population enriched for antiviral response genes, which we term WISP cells (Waldeyer's ring Interferon-Stimulated Population). We validated key transcriptomic findings through multiplex immunofluorescence microscopy in independent donor tissues, confirming the spatial localization of WISP and M cells and their predicted interactions with specific immune subsets.

  Study phs004103

• MGA-NUTM1 fusion in high grade spindle cell sarcoma

  NUT carcinoma (NC) with mesenchymal differentiation have rarely been described in the literature. In this report, we describe the characterization of two cases of high grade spindle cell sarcoma harboring a novel MGA-NUTM1 fusion. Whole genome sequencing identified the presence of complex rearrangements resulting in a MGA-NUTM1 fusion gene in the absence of other significant somatic mutations. The fusion protein was predicted to retain nearly the entire protein sequence of both MGA (exons 1-22) and NUTM1 (exons 3-8). In contrast to typical cases of NC, these cases were successfully treated with aggressive local control measures (surgery and radiation) and both patients remain alive without disease. These cases describe a new subtype of NUTM1-rearranged tumors warranting expansion of diagnostic testing to evaluate for the presence of MGA-NUTM1 or alternative NUTM1 gene fusions in the diagnostic workup of high grade spindle cell sarcomas or small round blue cell tumors of ambiguous lineage.

  Study EGAS00001003341

• Integrated genomic analysis identifies driver genes and cisplatin-resistant progenitor phenotype in pediatric liver cancer

  Pediatric liver cancers (PLCs) comprise diverse diseases affecting infants, children and adolescents. Despite overall good prognosis, PLCs display heterogeneous response to chemotherapy. Integrated genomic analysis of 126 pediatric liver tumors showed a continuum of driver mechanisms associated with patient age, including new targetable oncogenes. In 10% of hepatoblastoma patients, all before 3 years old, we identified a mosaic premalignant clonal expansion of cells altered at the 11p15.5 locus. Analysis of spatial and longitudinal heterogeneity revealed an important plasticity between ‘Hepatocytic’, ‘Liver Progenitor’ and ‘Mesenchymal’ molecular subgroups of hepatoblastoma. We showed that during chemotherapy, ‘Liver Progenitor’ cells accumulated massive loads of cisplatin-induced mutations with a specific mutational signature, leading to the development of heavily mutated relapses and metastases. Drug screening in PLC cell lines identified promising targets for cisplatin-resistant progenitor cells, validated in mouse xenograft experiments. These data provide new insights into cisplatin resistance mechanisms in PLC and suggest alternative therapies.

  Study EGAS00001005108

• Comprehensive survey for the construction of an integrated database of food, gut microbiome, and health information (the "Sukoyaka Health Survey")

  We conducted a cohort-based study to investigate the association between the genetic background and diet/lifestyle in 59 healthy Japanese. We analyzed some participants living in Nagasaki. Shotgun metagenomic sequencing of fecal microbiome were analyzed.

  Study JGAS000681

• DAC for "Transcriptome analysis of human iPSC-derived microglia in a novel human 3D cortical tissue model"

  scRNA-seq analysis of human iPSC-derived microglia in a novel, human in vitro 3D cortical tissue model. Samples include three distinct conditions (each as biological duplicates): wild-type microglia extracted from cultures after 1 month (WT_1mo) and 3 months (WT_3mo) of culturing, as well as knock-in microglia extracted from cultures carrying three familial AD mutations in the APP gene (Swedish, Iberian, Arctic; introduced by CRISPR/Cas9-mediated knock-in) after 3 months of culturing (KI_3mo).

  Dac EGAC50000000303

• WES analysis of DMD-ASD, DMD-ID and DMD-Control individuals for de novo and rare risk variants analysis

  This project generated a whole-exome sequencing (WES) dataset of 83 boys with a pathogenic variant in the DMD gene, along with WES data from the parents of 38 of them, totaling 159 samples. In addition to DMD, 12 boys also had ID (12 DMD-ID samples), 36 boys had ASD (DMD-ASD samples) and 35 did not present ID or ASD diagnosis (DMD-Control samples).

  Dataset EGAD50000001113