{"@type": "dcat:Dataset", "accessLevel": "public", "accrualPeriodicity": "irregular", "bureauCode": ["026:00"], "contactPoint": {"@type": "vcard:Contact", "fn": "GeneLab Outreach", "hasEmail": "mailto:genelab-outreach@lists.nasa.gov"}, "description": "BACKGROUND: Ionizing radiation (IR) can be extremely harmful for human cells since an improper DNA-damage response (DDR) to IR can contribute to carcinogenesis initiation. Perturbations in DDR pathway can originate from alteration in the functionality of the microRNA-mediated gene regulation being microRNAs (miRNAs) small noncoding RNA that act as post-transcriptional regulators of gene expression. In this study we gained insight into the role of miRNAs in the regulation of DDR to IR under microgravity a condition of weightlessness experienced by astronauts during space missions which could have a synergistic action on cells increasing the risk of radiation exposure. METHODOLOGY/PRINCIPAL FINDINGS: We analyzed miRNA expression profile of human peripheral blood lymphocytes (PBL) incubated for 4 and 24 h in normal gravity (1 g) and in modeled microgravity (MMG) during the repair time after irradiation with 0.2 and 2Gy of gamma-rays. Our results show that MMG alters miRNA expression signature of irradiated PBL by decreasing the number of radio-responsive miRNAs. Moreover let-7i* miR-7 miR-7-1* miR-27a miR-144 miR-200a miR-598 miR-650 are deregulated by the combined action of radiation and MMG. Integrated analyses of miRNA and mRNA expression profiles carried out on PBL of the same donors identified significant miRNA-mRNA anti-correlations of DDR pathway. Gene Ontology analysis reports that the biological category of Response to DNA damage is enriched when PBL are incubated in 1 g but not in MMG. Moreover some anti-correlated genes of p53-pathway show a different expression level between 1 g and MMG. Functional validation assays using luciferase reporter constructs confirmed miRNA-mRNA interactions derived from target prediction analyses. CONCLUSIONS/SIGNIFICANCE: On the whole by integrating the transcriptome and microRNome we provide evidence that modeled microgravity can affects the DNA-damage response to IR in human PBL.", "distribution": [{"@type": "dcat:Distribution", "description": "GeneLab Study Page", "downloadURL": "https://genelab-data.ndc.nasa.gov/genelab/accession/GLDS-128", "format": "HTML", "mediaType": "text/html", "title": "Identification of miRNAs involved in cell response to ionising radiation and modeled microgravity"}], "identifier": "nasa_genelab_GLDS-128_krvn-94zk", "issued": "2018-06-26", "keyword": ["data-collection", "ionizing-radiation", "labeling", "normalization-data-transformation", "nucleic-acid-hybridization", "rna-extraction", "sample-collection", "simulated-microgravity", "timepoint"], "landingPage": "https://data.nasa.gov/dataset/identification-of-mirnas-involved-in-cell-response-to-ionising-radiation-and-modeled-micro", "modified": "2025-04-23", "programCode": ["026:005"], "publisher": {"@type": "org:Organization", "name": "National Aeronautics and Space Administration"}, "theme": ["Earth Science"], "title": "Identification of miRNAs involved in cell response to ionising radiation and modeled microgravity"}