3613 results for "*geneti*"

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• Cellular Basis for Genetic Susceptibility to Neurodevelopmental Disorders

  In contrast to syndromic CNVs such as the 17p11.2 deletion in Smith-Magenis syndrome, which mostly occur de novo and are highly penetrant, more recent studies have identified another class of CNVs that are frequently inherited and associated with variable expressivity. We previously identified a 520-kb deletion on chromosome 16p12.1 that was associated with multiple neurodevelopmental outcomes, including intellectual disability/developmental delay (ID/DD), schizophrenia, autism, and epilepsy. This variant is inherited in >95% of cases from carrier parents manifesting neuropsychiatric features. We also found that affected children with the deletion were more likely to carry another large CNV or rare deleterious mutation elsewhere in the genome compared to carrier parents. Thus, while the 16p12.1 deletion confers significant risk for a range of disorders, the ultimate phenotypic trajectory is determined by variants in the genetic background. Functional assessment of the deletion would therefore provide a novel cellular paradigm for how the same variant confers susceptibility to distinct neurodevelopmental disorders. We used induced pluripotent stem cells (iPSCs) reprogrammed from peripheral blood mononuclear cells (PBMC) from three families with the 16p12.1 deletion, each including two or more affected children who manifest severe ID/DD or autism, carrier parents with neuropsychiatric features, and unaffected non-carrier parents. We generated neural progenitor cells (NPCs) and differentiated cortical neurons from 12 individuals from three families, including affected children with either severe ID or autism, carrier parents with neuropsychiatric features, and non-carrier parents, and assessed the impact of the deletion during different timepoints of neuronal development.

  Study phs002403

• Functional Genomics and Tumor Microenvironment Analysis Reveal Prognostic Biological Subtypes in Mantle Cell Lymphoma

  Mantle cell lymphoma (MCL) is a genetically and clinically heterogeneous B-cell malignancy. We studied two MCL cohorts with differing treatment patterns: one enriched for immunochemotherapy, the other for chemotherapy alone. TP53 alterations are consistently associated with poor prognosis, whereas ATM mutations correlate with improved outcomes following rituximab-based chemotherapy. Based on recurrent genetic events, six clusters are identified and refined into three prognostic groups: high-risk (TP53 mutations and deletions at 17p13.3, 13q14.2, and 19p13.3), intermediate-risk (ATM and epigenetic regulator mutations, or gains at 8q/17q/15q), and low-risk (lacking TP53 alterations, rare ATM mutations without 11q deletions, gains at 3q, deletions at 6q). Transcriptomic analysis reveals enrichment of proliferation, metabolism-promoting gene signatures in high-risk; angiogenesis and NOTCH signaling in intermediate-risk; and proinflammatory-related (i.e., IFNα, TNFα) in low-risk MCLs. Multi-proteomic spatial profiling using imaging mass cytometry (IMC) demonstrates enrichment of CD4⁺ T cells with high expression of exhaustion markers and a dominant population of myeloid cells skewed toward an M2-like phenotype. Spatially, TP53-perturbed MCLs are immune-infiltrated but exhausted, while ATM-perturbed cases remain immune-cold with dense tumors. Functional analysis shows that p53 represses BCR signaling through PTPN6 activation. Collectively, these findings highlight distinct molecular and immune landscapes and reveal therapeutic vulnerabilities in high-risk TP53-perturbed MCL.

  Study phs003849

• Role of Microglia Somatic Mutations in Neurodegenerative Diseases

  Somatic genetic heterogeneity resulting from post-zygotic DNA mutations is widespread in human tissues and can cause diseases, however few studies have investigated its role in neurodegenerative processes such as Alzheimer's Disease (AD). Here we report the selective enrichment of microglia clones carrying pathogenic variants, that are not present in neuronal, glia/stromal cells, or blood, from patients with AD in comparison to age-matched controls. Notably, microglia-specific AD-associated variants preferentially target the MAPK pathway, including recurrent CBL ring-domain mutations. These variants activate ERK and drive a microglia transcriptional program characterized by a strong neuro-inflammatory response, both in vitro and in patients. Although the natural history of AD-associated microglial clones is difficult to establish in human, microglial expression of a MAPK pathway activating variant was previously shown to cause neurodegeneration in mice, suggesting that AD-associated neuroinflammatory microglial clones may contribute to the neurodegenerative process in patients.

  Study phs002213

• Developmental Genotype Tissue Expression (dGTEx) Project

  Lay DescriptionThe aims of the Developmental Genotype-Tissue Expression (dGTEx) Project are to study changes in gene expression and regulation that affect both normal growth and impact health and disease in a pediatric cohort, spanning birth to age 18. Children are often underrepresented in clinical research, and most genomics studies primarily use adult donors and tissues that lack insight into specific developmental changes that occur in childhood. dGTEx researchers are studying genes from different tissues obtained from across pediatric development to create a database that researchers can use to study how genes change throughout childhood. The dGTEx project also includes a study of the donor consent process to help ensure that the goals of the project and participation in the project effectively address the concerns and expectations of donors and their families in the study.Scientific DescriptionDespite considerable variation in expression patterns across tissues and individuals, these patterns are relatively stable throughout adulthood, where most human gene expression studies have been performed. The changes in gene expression that occur during postnatal development are largely unstudied, yet lead to important milestones in health and disease, such as the onset or cessation of growth spurts or puberty, and the development of both childhood specific diseases, as well as diseases that manifest much later in life.The goal of the developmental Genotype-Tissue Expression (dGTEx) project is to establish a resource database in which to study the relationship between gene expression and other molecular phenotypes in multiple relatively healthy reference neonatal, pediatric, and adolescent tissues, building on the original (adult) GTEx project.This study aims to recruit at least 120 donors with a total of ~30 donors per age group, in each of 4 developmental windows: Infant: 0-2 yo, Early Childhood: 2-8 yo, Pre-pubertal: ~8-12.5 yo, Post-pubertal: ~12.5-18 yo. Donor tissue collection protocols have been developed to maximize the diversity of quality tissues recovered, with a minimum of 20 to a maximum of 74 different tissue sites sampled per donor.The pediatric study is complemented by the Non-Human Primate Developmental GTEx (NHP-dGTEx) project which will also catalog and analyze transcriptional profiles across a wide variety of tissues at multiple developmental stages from two species of non-human primates: Macaca mulatta (rhesus macaque), an old world monkey, and Callithrix jacchus (common marmoset), a new world monkey. The main goal of the project is to create a parallel data resource of tissues from individuals at each of 6-8 developmental stages, to enhance understanding of developmental changes and allow cross-species, temporal comparisons of gene expression, and cell-type specific gene and epigenetic data across different stages of primate development.

  Study phs003838

• CIDR: Understanding the Increased Risk of Childhood Acute Lymphoblastic Leukemia in Latinos

  This study aims to investigate the genetic contribution to the increased risk of acute lymphoblastic leukemia (ALL) in children of Hispanic/Latino ethnicity. Genome-wide single nucleotide polymorphism (SNP) genotyping was performed on childhood ALL cases and controls of self-reported Hispanic/Latino ethnicity from two studies: 1) the California Childhood Leukemia Study (CCLS), and 2) the Mexican Interinstitutional Group for the Identification of the Causes of Childhood Leukemia (MIGICCL). This study will provide genome-wide SNP array data from Hispanic/Latino children, contributing to studies of the genetic etiology of childhood ALL and cancer health disparities. It will also provide data from childhood ALL cases and controls from a Hispanic/Latino population outside of the United States (i.e., Mexico). Genetic data were generated by the Center for Inherited Disease Research. Samples were genotyped using the Illumina Global Diversity Array GDA-8v1-0. Individual level genotype data will be available through dbGaP. Note that for a small number of genotyped cases in the MIGICCL study, it was later found that these were not ALL cases but were either acute myeloid leukemia (AML) or non-acute leukemia. Additional available data include demographic and birth-related variables, and patient-related data including age-at-diagnosis and leukemia immunophenotype and molecular subtypes.

  Study phs003953

• Targeted Long-Read Sequencing Enables Comprehensive Analysis of the Genetic and Epigenetic Landscape of Inherited Myopathies

  This study investigated the utility of targeted Oxford Nanopore Technologies (ONT) long-read sequencing (LRS) for the diagnosis of inherited myopathies. A targeted ONT LRS assay was applied to a cohort of myopathy participants with and without previous genetic diagnoses. Our results demonstrate that this assay provides comprehensive genetic and epigenetic characterisation of inherited myopathies. At the time of dbGaP submission, disease causing variants had been identified a number of genes (DUX4, GIPC1, DGUOK, NOTCH2NLC, RILPL1, ABCD3, LAMA2 and CAPN3) in a group of previously undiagnosed genetic myopathy participants. The ONT LRS assay also identified known pathogenic variants in a number of genes (CAPN3, CACNA1S, RYR1, MT-TL1, CNBP, DMD, DUX4, SMCHD1) in a group of positive control participants with previously known genetic diagnoses.

  Study phs004623

• Acute Respiratory Distress Network (ARDSNet) Study 02 Late Steroid Rescue Study (LaSRS) (ARDSNet-LaSRS-BioLINCC)

  Data Access NOTE: Please refer to the “Authorized Access” section below for information about how access to the data from this accession differs from many other dbGaP accessions. Biospecimens: Access to Biospecimens is through the NHLBI Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC). Biospecimens from ARDSNet-LaSRS include BAL Slides, Bronchial Lavage, and Plasma. Please note that use of biospecimens in genetic research is subject to a tiered consent.Objectives: Since previous reports suggested that corticosteroids may improve survival, this project was developed as a multicenter, randomized controlled trial of corticosteroids in patients with persistent ARDS.Background: Persistent acute respiratory distress syndrome (ARDS) is characterized by excessive fibroproliferation, ongoing inflammation, prolonged mechanical ventilation, and a substantial risk of death.Participants: There were 180 participants.Conclusions: The results do not support the routine use of methylprednisolone for persistent ARDS despite the improvement in cardiopulmonary physiology. In addition, starting methylprednisolone therapy more than two weeks after the onset of ARDS may increase the risk of death. (NEJM April 20, 2006; Vol 354, No. 16, pp 1671-84).

  Study phs003769

• Honolulu Heart Program (HHP-BioLINCC)

  Data Access NOTE: Please refer to the “Authorized Access” section below for information about how access to the data from this accession differs from many other dbGaP accessions. Access to Biospecimens is through the NHLBI Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC). Biospecimens from HHP include DNA, plasma, serum, and whole blood. Please note that use of biospecimens in genetic research is subject to a tiered consent. Objectives: The initial objectives of the Honolulu Heart Program were to: 1) estimate morbidity and mortality from coronary heart disease and stroke among Japanese men in Honolulu; 2) compare morbidity and mortality from coronary heart disease and stroke among Japanese men in Japan, Honolulu, and San Francisco; 3) investigate relationships among risk factors, coronary heart disease, and stroke in Japanese men in Honolulu; 4) compare distributions of risk factors among men in Japan, Honolulu, and San Francisco, and relate similarities and differences in risk factors to the occurrence of disease in these areas and in other populations, including Framingham and Puerto Rico; 5) conduct an autopsy study, and to relate pathological findings to morbidity and mortality data; and 6) investigate relationships between risk factors and pathological evidence of atherosclerosis and its complications.Background: The Honolulu Heart Program was initiated in 1965 by the NHLBI as a prospective study of environmental and biological causes of cardiovascular disease among Japanese Americans living in Hawaii. This population was known to have low incidence of coronary heart disease and higher incidence of stroke. The study provided opportunities to investigate relationships among disease frequencies, pathologic findings, and disease predictors in the cohort and to compare the findings in this population with those in other populations, especially cohorts of Japanese men resident in Japan or the U.S.Participants: There were 8006 participants.Design: The study began in 1965 with the first examination of a cohort of 8,006 Japanese-American men residing on the island of Oahu, Hawaii who were born during the period 1900-1919. The first examination was completed in 1968 and was followed by the initiation of a second examination that same year. Three subsequent sub-examinations (Lipoprotein Exams I, II and III) were conducted between 1970 and 1982 to collect lipid measurements on a subset of those who participated in Exam II. The fourth examination of surviving members of the original cohort was conducted during 1991-93 and collected data on 3,741 men. Morbidity and mortality follow-up continues through grant and contract-supported efforts, and the current HHP dataset includes events through 1998.

  Study phs003907

• Framingham Heart Study-Cohort (FHS-Cohort) - BioLINCC

  Data Access NOTE Please refer to the "Authorized Access" section below for information about how access to the data from this accession differs from many other dbGaP accessions. Related Studies Other Framingham data available include: Imaging studies (Framingham Heart Study-Cohort (FHS-Cohort)-Imaging, phs003593), Genetics and genomics (Framingham Cohort, phs000007), Collaborative Cohort of Cohorts for COVID-19 Research (C4R): (Framingham Heart Study, phs002911), and as a component of the Sleep Heart Health Study (SHHS-BioLINCC, phs003637). Available Data Original cohort: data now include examination data from the first 32 clinical exams, selected ancillary data, and event follow-up through 2018. Offspring/Omni1 cohort: Data available include Framingham Offspring examination data from the first 9 clinical exams and selected ancillary data and event follow-up through 2019. Also included are the first 4 exams from the OMNI 1 cohort. Third Generation/Omni2/New Offspring Cohort: Data available include Framingham Generation 3 examination data from the first 3 clinical exams, selected ancillary data and event follow-up through 2019. Also included are the OMNI 2 and New Offspring (NOS) cohorts. A genetic pedigree is not provided for the Framingham phenotype only data. Objectives The objectives of the Framingham Study are to study the incidence and prevalence of cardiovascular disease (CVD) and its risk factors, trends in CVD incidence and its risk factors over time, and familial patterns of CVD and risk factors. Other important objectives include the estimation of incidence rates of disease and description of the natural history of cardiovascular disease, including the sequence of clinical signs and systems that precede the clinically recognizable syndrome and the consequences and course of clinically manifest disease. Background Original cohort: The original cohort of the Framingham Study began in 1948 under the U.S. Public Health Service and was transferred under the direct operations of the new National Heart Institute, NIH, in 1949. Participants were sampled from Framingham, Massachusetts, including both men and women. This was the first prospective study of cardiovascular disease and identified the concept of risk factors and their joint effects. Offspring/Omni1 cohort: With the aging of the Framingham cohort and with interest in familiar aggregation and heritability, a new cohort consisting of the offspring of the original cohort was sampled. Spouses of offspring were also included. This new sample, began enrollment in 1971 and constituted a second generation of participants, permitting new assessment of risk factors and outcomes, and provided a resource for the genetic analyses which were yet to come. The Offspring participants have had repeated examinations, though at typically longer intervals than the original cohort. Third Generation/Omni2/New Offspring Cohort: Thirty-one years after enrollment began for the second generation of the Framingham Heart Study (Framingham Offspring Study), Framingham investigators began enrolling adults with at least one parent enrolled in the Offspring study into the Framingham Generation 3 cohort. The addition of the third generation was expected to facilitate investigation of secular trends in risk factors and indicators of health and disease within families, to enhance statistical power to detect genetic and environmental determinants of complex diseases, and to clarify how subclinical cardiovascular disease predicts occurrence of overt clinical events. Participants Original cohort: At entry to the study in 1948-1952, the study recruited 5,209 men and women, ages 28-62 years, living in Framingham, MA. Offspring/Omni1 cohort: 5,124 men and women, ages 5-70 years at entry consisting of offspring of the original Framingham cohort (and spouses of the offspring). In 1994, the Omni Cohort 1 enrolled 507 men and women of African-American, Hispanic, Asian, Indian, Pacific Islander and Native American origins, who at the time of enrollment were residents of Framingham and the surrounding towns. Third Generation/Omni2/New Offspring Cohort: 4095 men and women, almost all who self reported their ethnicity as white, ages 19+ years at entry, with at least one parent in the Framingham Offspring study, participated in the Gen III cohort. The New Offspring Cohort enrolled spouses of Offspring participants that were not otherwise enrolled and had at least two biological children participating in Gen III. 103 New Offspring Spouses (47 men and 56 women) participated. The OMNI 2 cohort enrolled additional ethnically diverse participants, including many individuals related to the participants of Omni Cohort 1 and also individuals unrelated to Omni Cohort 1 members for a total of 410 new participants. Design The cardiovascular disease conditions under investigation include coronary heart disease (angina pectoris, myocardial infarction, coronary insufficiency and sudden and non-sudden death), stroke, hypertension, peripheral arterial disease and congestive heart failure. Original cohort: The Framingham Study is a longitudinal investigation of constitutional and environmental factors influencing the development of CVD in men and women. Examination of participants has taken place every two years and the cohort has been followed for morbidity and mortality over that time period. Offspring/Omni1 cohort: By 1975, a sample of 5,124 men and women, consisting of offspring of the original Framingham cohort (and spouses of the offspring) had participated in the study. Additional studies of these subjects have continued under research contracts. Third Generation/Omni2/New Offspring Cohort: The children of Offspring Cohort participants were initially identified who would be 20 years of age or older by the end of the enrollment period. A higher priority for recruitment was assigned to individuals who belonged to large extended families, in order to complement phenotypic and genotypic information already obtained from prior generations. The baseline examination was begun in 2002 and completed in 2005.

  Study phs003594

• Genomic Landscape of Colorectal Cancer in a Multi-Ancestry Cohort

  Elucidating the tumor mutational landscape of colorectal cancer (CRC) in admixed and ancestrally diverse populations is essential to enable precision medicine advancements that benefit individuals of all backgrounds. This study draws from the Latino Colorectal Cancer Consortium (LC3) and other prior initiatives to characterize and examine the somatic mutational patterns of colorectal tumors in Hispanic/Latino/Latina patients (henceforth referred to as Latino) as compared to other racial and ethnic populations. It includes paired tumor-normal whole-exome sequencing from 718 patients with primary CRC (128 Latino and 469 non-Latino individuals) to investigate the associations between somatic mutational features and both self-reported ethnicity and genetic ancestry. Somatic mutations and inherited variants were called, and global genetic ancestry proportions (African, Asian, European, Native American) were estimated from inherited variants using ADMIXTURE based on reference samples from the 1000 Genomes Project (1KGP) and the Population Architecture using Genomics and Epidemiology (PAGE) Study. Associations between genetic ancestry and gene-level mutational status, microsatellite instability status, and tumor mutational burden were estimated using logistic regression, after adjusting for age at diagnosis, sex, tumor location, and stage.

  Study phs003464