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• ROBUST (NCT02285062)

  The ROBUST clinical trial is a Phase III, randomized, double-blind, placebo-controlled study designed to compare the efficacy and safety of lenalidomide plus R-CHOP chemotherapy (R2-CHOP) versus placebo plus R-CHOP in newly diagnosed Diffuse Large B-cell Lymphoma (DLBCL). Molecular data was collected for all patients at screening, but the only patients of the Activated B-cell (ABC) cell-of-origin subtype were eligible for study inclusion and clinical follow-up. We have performed unsupervised clustering on this cohort and identified 7 novel transcriptional subtypes of DLBCL, one of which represents a high-risk subset of patients with high MYC expression, ABC-associated biology, and low immune infiltration.

  Study EGAS50000000333

• HiDEF-seq single-molecule sequencing of single-strand mismatches and damage

  Our study sought to resolve, with single-molecule fidelity, the mismatches and damage events that precede DNA mutations. Using a novel single-molecule, long-read sequencing method (HiDEF-seq) we detect base substitutions when present in either one or both DNA strands. We also detect cytosine deamination, a common type of DNA damage, with single-molecule fidelity. This study profiled 134 samples from diverse tissues, including from individuals with cancer predisposition syndromes. These samples revealed single-strand mismatch and damage signatures. Since double-strand DNA mutations are only the endpoint of the mutation process, our approach enables new studies of how mutations arise in a variety of contexts, especially in cancer and aging.

  Study EGAS50000000318

• Single cell RNAseq 7 days - Calprotectin in vitro effects on human early hematopoiesis

  To explore the effects of calprotectin (CAL) on early hematopoiesis, we incubated CD34+ cells from four healthy donors for 7 days in the presence of stem cell factor (SCF), FLT3-ligand and thrombopoietin (TPO) without and with CAL, interleukin-6 (IL6) and the IL6_CAL combination before collecting cells. We performed the same experiment with CD34+ cells collected from three patients with JAK2-V617F-mediated myelofibrosis (MF). A total of 135,545 cells from healthy donors and 111,725 cells from myelofibrosis patients were analyzed by single-cell RNA sequencing (scRNA-seq) using the 10X Chromium droplet-based platform. Single cell RNAseq 7 days - Normal and tumor samples 4 conditons : -Control - Calprotectin - IL-6 - Calprotectin+IL-6

  Study EGAS50000000455

• Bulk ATACseq 7days - Calprotectin in vitro effects on human early hematopoiesis

  To explore the effects of calprotectin (CAL) on early hematopoiesis, we incubated CD34+ cells from four healthy donors for 7 days in the presence of stem cell factor (SCF), FLT3-ligand and thrombopoietin (TPO) without and with CAL, interleukin-6 (IL6) and the IL6_CAL combination before collecting cells. We performed the same experiment with CD34+ cells collected from three patients with JAK2-V617F-mediated myelofibrosis (MF). A total of 135,545 cells from healthy donors and 111,725 cells from myelofibrosis patients were analyzed by single-cell RNA sequencing (scRNA-seq) using the 10X Chromium droplet-based platform. Bulk ATACseq 7days - Normal and tumor samples 4 conditons : -Control - Calprotectin - IL-6 - Calprotectin+IL-6

  Study EGAS50000000456

• Precision Diagnosis of Neurodevelopmental Disorders in Middle Eastern Populations

  We constructed de novo genome assemblies for six family trios from diverse Middle Eastern ancestries (Sudan, Jordan, Syria, Qatar, and Afghanistan), involving probands with various unresolved neurodevelopmental conditions. We generated high-quality, nearly complete genome assemblies for trios, revealing extended novel sequence impacting known genes, novel HLA/KIR alleles, and strong signals of inbreeding, with runs of homozygosity covering large parts of individual chromosomes. We also identified potential disease variants underlying the unresolved symptoms. Also, the assemblies uncovered unique variation relative to existing references, showing enhanced mapping and variant calling of Middle Eastern genomes. The dataset available through dbGaP includes raw short (Illumina) and long (PacBio) sequencing reads and assembled haplotypes.

  Study phs003917

• CpG methylation changes associated with hyperglycemia in type 1 diabetes occur at angiogenic glomerular and retinal gene loci.

  Retinal and glomerular microangiopathy, and cardiovascular disease, contribute to the morbidity and mortality observed in adults with type 1 diabetes (T1D). While the level and duration of hyperglycemia are primary factors influencing these complications, the underlying molecular mechanisms behind glucose-induced organ damage remain poorly understood. In this study, blood samples from young T1D patients at diagnosis and three years later in average were analyzed for DNA methylation using whole-genome bisulfite sequencing. Significant DNA methylation changes in critical angiogenic gene loci were associated with HbA1c, a direct hallmark of chronic hyperglycemia. This finding may offer novel epigenetic insights for a better understanding of T1D complications.

  Study EGAS50000000370

• Re-evaluation of human mitochondrial DNA methylation reveals signals consistent with technical artifacts

  The existence and functional relevance of mitochondrial DNA (mtDNA) methylation remain controversial. We assessed 5mC and 5hmC in human brain, blood, and related cancers using both enzymatic and native DNA sequencing. While nuclear DNA exhibited expected methylation patterns, mtDNA consistently showed negligible methylation levels, indistinguishable from technical noise. Elevated methylation in nuclear-embedded mitochondrial sequences demonstrates a clear potential to confound mtDNA methylation measurements. Furthermore, technical discrepancies in mtDNA methylation were observed, underscoring the need for careful evaluation when interpreting data generated using earlier sequencing workflows. Our findings provide evidence against the presence of 5mC or 5hmC in mtDNA under the physiological and pathological conditions studied.

  Study EGAS50000001186

• Lessons learned from the exome sequencing of nine cases of infertility and the way forward

  This study investigated the role of exome sequencing in the diagnosis of male and female infertility. Nine unrelated cases referred between 2019 and 2024 were analysed using exome sequencing, with segregation confirmed by Sanger sequencing and functional assays for splicing variants. We identified nine causative variants in genes including TUBB8, PATL2, CCDC39, STAG3, KIAA0319, FBXO43, AGBL5/BBS7, PLCZ1, and HS6ST1, six of which were novel. The findings highlight diverse reproductive phenotypes such as oocyte maturation arrest, early embryonic arrest, spermatogenic failure, and syndromic infertility. This work demonstrates the value of combining genetic, functional, and clinical approaches to improve diagnostic yield and patient care in reproductive failure.

  Study EGAS50000001320

• Insights into BRCA1 and TP53 associated breast cancer development from integrated whole genome analysis of mouse model mammary tumors

  Germline mutations in BRCA1 are a leading cause of hereditary breast cancer. We generated Brca1;Trp53 double conditional knockout (CKO) and Trp53 single CKO mouse models, both with either one or two copies of Trp53 deleted by Cre. We used whole-genome sequencing and optical genome mapping to interrogate the genomes of the resulting mammary tumors. Our comprehensive genomic analyses show that the Brca1;Trp53-CKO tumors recapitulate major genomic features of the human BRCA1 breast samples indicative of conserved fundamental mutational processes. This study also provides new insights into the genetic mechanisms of tumor development with potential implications for the treatment of BRCA1 cancers.

  Study EGAS50000001402

• Splicing signature analysis of RNU2-2 samples

  Dominant pathogenic variants in the snRNA RNU2-2 were recently reported as a cause of neurodevelopmental disorders. In our study we identified additional individuals with dominant variants (n.4G>A and n.35A>G) and we also identified biallelic variants as a novel frequent cause of neurodevelopmental disorder. We obtained blood samples and performed short-term lymhocytes cultures for 19 cases (5 n.4; 5 n.35; 9 biallelic). We generated exome-capture RNA-Seq for these cases that we compared to 49 controls (probands affected from a neurodevelopmental disorder but without RNU2-2 variants). We observed that RNU2-2 variants mainly disturb alternative exon skipping, although affecting different exons.

  Study EGAS50000001410