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Evans TA, Feltrin AS, Benjamin KJ, Katipalli T, Hyde T, Kleinman JE, Weinberger DR, Paquola AC, Erwin JA. Lifespan analysis of repeat expression reveals age-dependent upregulation of HERV-K in the neurotypical human brain. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2024:2024.05.17.24307184. [PMID: 38798538 PMCID: PMC11118647 DOI: 10.1101/2024.05.17.24307184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
DNA repetitive sequences (or repeats) comprise over 50% of the human genome and have a crucial regulatory role, specifically regulating transcription machinery. The human brain is the tissue with the highest detectable repeat expression and dysregulations on the repeat activity are related to several neurological and neurodegenerative disorders, as repeat-derived products can stimulate a pro-inflammatory response. Even so, it is unclear how repeat expression acts on the aging neurotypical brain. Here, we leverage a large postmortem transcriptome cohort spanning the human lifespan to assess global repeat expression in the neurotypical brain. We identified 21,696 differentially expressed repeats (DERs) that varied across seven age bins (Prenatal; 0-15; 16-29; 30-39; 40-49; 50-59; 60+) across the caudate nucleus (n=271), dorsolateral prefrontal cortex (n=304), and hippocampus (n=310). Interestingly, we found that long interspersed nuclear elements and long terminal repeats (LTRs) DERs were the most abundant repeat families when comparing infants to early adolescence (0-15) with older adults (60+). Of these differentially regulated LTRs, we identified 17 shared across all brain regions, including increased expression of HERV-K-int in older adult brains (60+). Co-expression analysis from each of the three brain regions also showed repeats from the HERV subfamily were intramodular hubs in its subnetworks. While we do not observe a strong global relationship between repeat expression and age, we identified HERV-K as a repeat signature associated with the aging neurotypical brain. Our study is the first global assessment of repeat expression in the neurotypical brain.
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Paull TT, Woolley PR. A-T neurodegeneration and DNA damage-induced transcriptional stress. DNA Repair (Amst) 2024; 135:103647. [PMID: 38377644 DOI: 10.1016/j.dnarep.2024.103647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 02/08/2024] [Indexed: 02/22/2024]
Abstract
Loss of the ATM protein kinase in humans results in Ataxia-telangiectasia, a disorder characterized by childhood-onset neurodegeneration of the cerebellum as well as cancer predisposition and immunodeficiency. Although many aspects of ATM function are well-understood, the mechanistic basis of the progressive cerebellar ataxia that occurs in patients is not. Here we review recent progress related to the role of ATM in neurons and the cerebellum that comes from many sources: animal models, post-mortem brain tissue samples, and human neurons in culture. These observations have revealed new insights into the consequences of ATM loss on DNA damage, gene expression, and immune signaling in the brain. Many results point to the importance of reactive oxygen species as well as single-strand DNA breaks in the progression of molecular events leading to neuronal dysfunction. In addition, innate immunity signaling pathways appear to play a critical role in ATM functions in microglia, responding to various forms of nucleic acid sensors and regulating survival of neurons and other cell types. Overall, the results lead to an updated view of transcriptional stress and DNA damage resulting from ATM loss that results in changes in gene expression as well as neuroinflammation that contribute to the cerebellar neurodegeneration observed in patients.
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Affiliation(s)
- Tanya T Paull
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA.
| | - Phillip R Woolley
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA
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Cicchinelli S, Pignataro G, Gemma S, Piccioni A, Picozzi D, Ojetti V, Franceschi F, Candelli M. PAMPs and DAMPs in Sepsis: A Review of Their Molecular Features and Potential Clinical Implications. Int J Mol Sci 2024; 25:962. [PMID: 38256033 PMCID: PMC10815927 DOI: 10.3390/ijms25020962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 12/31/2023] [Accepted: 01/08/2024] [Indexed: 01/24/2024] Open
Abstract
Sepsis is a serious organ dysfunction caused by a dysregulated immune host reaction to a pathogen. The innate immunity is programmed to react immediately to conserved molecules, released by the pathogens (PAMPs), and the host (DAMPs). We aimed to review the molecular mechanisms of the early phases of sepsis, focusing on PAMPs, DAMPs, and their related pathways, to identify potential biomarkers. We included studies published in English and searched on PubMed® and Cochrane®. After a detailed discussion on the actual knowledge of PAMPs/DAMPs, we analyzed their role in the different organs affected by sepsis, trying to elucidate the molecular basis of some of the most-used prognostic scores for sepsis. Furthermore, we described a chronological trend for the release of PAMPs/DAMPs that may be useful to identify different subsets of septic patients, who may benefit from targeted therapies. These findings are preliminary since these pathways seem to be strongly influenced by the peculiar characteristics of different pathogens and host features. Due to these reasons, while initial findings are promising, additional studies are necessary to clarify the potential involvement of these molecular patterns in the natural evolution of sepsis and to facilitate their transition into the clinical setting.
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Affiliation(s)
- Sara Cicchinelli
- Department of Emergency, S.S. Filippo e Nicola Hospital, 67051 Avezzano, Italy;
| | - Giulia Pignataro
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Stefania Gemma
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Andrea Piccioni
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Domitilla Picozzi
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Veronica Ojetti
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Francesco Franceschi
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Marcello Candelli
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
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Tournier B, Aucagne R, Truntzer C, Fournier C, Ghiringhelli F, Chapusot C, Martin L, Bouvier AM, Manfredi S, Jooste V, Callanan MB, Lepage C. Integrative Clinical and DNA Methylation Analyses in a Population-Based Cohort Identifies CDH17 and LRP2 as Risk Recurrence Factors in Stage II Colon Cancer. Cancers (Basel) 2022; 15:cancers15010158. [PMID: 36612154 PMCID: PMC9817957 DOI: 10.3390/cancers15010158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 12/20/2022] [Indexed: 12/29/2022] Open
Abstract
Stage II colon cancer (CC), although diagnosed early, accounts for 16% of CC deaths. Predictors of recurrence risk could mitigate this but are currently lacking. By using a DNA methylation-based clinical screening in real-world (n = 383) and in TCGA-derived cohorts of stage II CC (n = 134), we have devised a novel 40 CpG site-based classifier that can segregate stage II CC into four previously undescribed disease sub-classes that are characterised by distinct molecular features, including activation of MYC/E2F-dependant proliferation signatures. By multivariate analyses, hypermethylation of 2 CpG sites at genes CDH17 and LRP2, respectively, was found to independently confer either significantly increased (CDH17; p-value, 0.0203) or reduced (LRP2; p-value, 0.0047) risk of CC recurrence. Functional enrichment and immune cell infiltration analyses, on RNAseq data from the TCGA cohort, revealed cases with hypermethylation at CDH17 to be enriched for KRAS, epithelial-mesenchymal transition and inflammatory functions (via IL2/STAT5), associated with infiltration by 'exhausted' T cells. By contrast, LRP2 hypermethylated cases showed enrichment for mTORC1, DNA repair pathways and activated B cell signatures. These findings will be of value for improving personalised care paths and treatment in stage II CC patients.
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Affiliation(s)
- Benjamin Tournier
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Department of Pathology, Dijon University Hospital, 21000 Dijon, France
| | - Romain Aucagne
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Unit for Innovation in Genetics and Epigenetics in Oncology (IGEO) and CRIGEN (Crispr Functional Genomics), Dijon University Hospital, 21000 Dijon, France
- Genetics and Immunology Medical Institute (GIMI), 21000 Dijon, France
| | - Caroline Truntzer
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Unit for Innovation in Genetics and Epigenetics in Oncology (IGEO) and CRIGEN (Crispr Functional Genomics), Dijon University Hospital, 21000 Dijon, France
- Centre Georges-François Leclerc (CGFL), 21000 Dijon, France
| | - Cyril Fournier
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Unit for Innovation in Genetics and Epigenetics in Oncology (IGEO) and CRIGEN (Crispr Functional Genomics), Dijon University Hospital, 21000 Dijon, France
- Genetics and Immunology Medical Institute (GIMI), 21000 Dijon, France
| | - François Ghiringhelli
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Unit for Innovation in Genetics and Epigenetics in Oncology (IGEO) and CRIGEN (Crispr Functional Genomics), Dijon University Hospital, 21000 Dijon, France
- Genetics and Immunology Medical Institute (GIMI), 21000 Dijon, France
- Centre Georges-François Leclerc (CGFL), 21000 Dijon, France
| | - Caroline Chapusot
- Department of Pathology, Dijon University Hospital, 21000 Dijon, France
| | - Laurent Martin
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Department of Pathology, Dijon University Hospital, 21000 Dijon, France
| | - Anne Marie Bouvier
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
| | - Sylvain Manfredi
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Department of Hepato-Gastroenterology and Digestive Oncology, Dijon University Hospital, 21000 Dijon, France
| | - Valérie Jooste
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Department of Hepato-Gastroenterology and Digestive Oncology, Dijon University Hospital, 21000 Dijon, France
| | - Mary B. Callanan
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Unit for Innovation in Genetics and Epigenetics in Oncology (IGEO) and CRIGEN (Crispr Functional Genomics), Dijon University Hospital, 21000 Dijon, France
- Genetics and Immunology Medical Institute (GIMI), 21000 Dijon, France
- Correspondence: (M.B.C.); (C.L.)
| | - Côme Lepage
- Faculty of Health Sciences, University of Burgundy, 21000 Dijon, France
- Institut National de la Santé et de la Recherche Médicale (INSERM) UMR1231, 21000 Dijon, France
- Department of Hepato-Gastroenterology and Digestive Oncology, Dijon University Hospital, 21000 Dijon, France
- Correspondence: (M.B.C.); (C.L.)
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