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Allou L, Mundlos S. Disruption of regulatory domains and novel transcripts as disease-causing mechanisms. Bioessays 2023; 45:e2300010. [PMID: 37381881 DOI: 10.1002/bies.202300010] [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: 01/16/2023] [Revised: 05/24/2023] [Accepted: 06/06/2023] [Indexed: 06/30/2023]
Abstract
Deletions, duplications, insertions, inversions, and translocations, collectively called structural variations (SVs), affect more base pairs of the genome than any other sequence variant. The recent technological advancements in genome sequencing have enabled the discovery of tens of thousands of SVs per human genome. These SVs primarily affect non-coding DNA sequences, but the difficulties in interpreting their impact limit our understanding of human disease etiology. The functional annotation of non-coding DNA sequences and methodologies to characterize their three-dimensional (3D) organization in the nucleus have greatly expanded our understanding of the basic mechanisms underlying gene regulation, thereby improving the interpretation of SVs for their pathogenic impact. Here, we discuss the various mechanisms by which SVs can result in altered gene regulation and how these mechanisms can result in rare genetic disorders. Beyond changing gene expression, SVs can produce novel gene-intergenic fusion transcripts at the SV breakpoints.
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Affiliation(s)
- Lila Allou
- RG Development & Disease, Max Planck Institute for Molecular Genetics, Berlin, Germany
- Institute for Medical and Human Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Stefan Mundlos
- RG Development & Disease, Max Planck Institute for Molecular Genetics, Berlin, Germany
- Institute for Medical and Human Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Berlin-Brandenburg Center for Regenerative Therapies, Charité-Universitätsmedizin Berlin, Berlin, Germany
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2
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Zhou P, VanDusen NJ, Zhang Y, Cao Y, Sethi I, Hu R, Zhang S, Wang G, Ye L, Mazumdar N, Chen J, Zhang X, Guo Y, Li B, Ma Q, Lee JY, Gu W, Yuan GC, Ren B, Chen K, Pu WT. Dynamic changes in P300 enhancers and enhancer-promoter contacts control mouse cardiomyocyte maturation. Dev Cell 2023; 58:898-914.e7. [PMID: 37071996 PMCID: PMC10231645 DOI: 10.1016/j.devcel.2023.03.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 02/16/2023] [Accepted: 03/05/2023] [Indexed: 04/20/2023]
Abstract
Cardiomyocyte differentiation continues throughout murine gestation and into the postnatal period, driven by temporally regulated expression changes in the transcriptome. The mechanisms that regulate these developmental changes remain incompletely defined. Here, we used cardiomyocyte-specific ChIP-seq of the activate enhancer marker P300 to identify 54,920 cardiomyocyte enhancers at seven stages of murine heart development. These data were matched to cardiomyocyte gene expression profiles at the same stages and to Hi-C and H3K27ac HiChIP chromatin conformation data at fetal, neonatal, and adult stages. Regions with dynamic P300 occupancy exhibited developmentally regulated enhancer activity, as measured by massively parallel reporter assays in cardiomyocytes in vivo, and identified key transcription factor-binding motifs. These dynamic enhancers interacted with temporal changes of the 3D genome architecture to specify developmentally regulated cardiomyocyte gene expressions. Our work provides a 3D genome-mediated enhancer activity landscape of murine cardiomyocyte development.
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Affiliation(s)
- Pingzhu Zhou
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Nathan J VanDusen
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Yanchun Zhang
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Yangpo Cao
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Isha Sethi
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Rong Hu
- Ludwig Institute for Cancer Research, Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Shuo Zhang
- Houston Methodist Hospital Research Institute, Houston, TX 77030, USA
| | - Guangyu Wang
- Cardiovascular Department, Houston Methodist, Weill Cornell Medical College, Houston, TX, USA
| | - Lincai Ye
- Department of Thoracic and Cardiovascular Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Neil Mazumdar
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Jian Chen
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Xiaoran Zhang
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Yuxuan Guo
- Peking University Health Science Center, Beijing, China
| | - Bin Li
- Ludwig Institute for Cancer Research, Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Qing Ma
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Julianna Y Lee
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA
| | - Weiliang Gu
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA; Department of Pharmacology, School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Guo-Cheng Yuan
- Department of Genetics and Genomic Sciences, Charles Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Bing Ren
- Ludwig Institute for Cancer Research, Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Kaifu Chen
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA.
| | - William T Pu
- Department of Cardiology, Boston Children's Hospital, Boston, MA, USA; Harvard Stem Cell Institute, Cambridge, MA, USA.
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3
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Cosma MP, Neguembor MV. The magic of unraveling genome architecture and function. Cell Rep 2023; 42:112361. [PMID: 37059093 DOI: 10.1016/j.celrep.2023.112361] [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: 12/06/2022] [Revised: 02/20/2023] [Accepted: 03/22/2023] [Indexed: 04/16/2023] Open
Abstract
Over the last decades, technological breakthroughs in super-resolution microscopy have allowed us to reach molecular resolution and design experiments of unprecedented complexity. Investigating how chromatin is folded in 3D, from the nucleosome level up to the entire genome, is becoming possible by "magic" (imaging genomic), i.e., the combination of imaging and genomic approaches. This offers endless opportunities to delve into the relationship between genome structure and function. Here, we review recently achieved objectives and the conceptual and technical challenges the field of genome architecture is currently undertaking. We discuss what we have learned so far and where we are heading. We elucidate how the different super-resolution microscopy approaches and, more specifically, live-cell imaging have contributed to the understanding of genome folding. Moreover, we discuss how future technical developments could address remaining open questions.
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Affiliation(s)
- Maria Pia Cosma
- Medical Research Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, 106 Zhongshan Er Road, Yuexiu District, 510080 Guangzhou, China; Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, 08003 Barcelona, Spain; Universitat Pompeu Fabra (UPF), Dr Aiguader 88, 08003 Barcelona, Spain; ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain.
| | - Maria Victoria Neguembor
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, 08003 Barcelona, Spain.
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4
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Cova G, Glaser J, Schöpflin R, Prada-Medina CA, Ali S, Franke M, Falcone R, Federer M, Ponzi E, Ficarella R, Novara F, Wittler L, Timmermann B, Gentile M, Zuffardi O, Spielmann M, Mundlos S. Combinatorial effects on gene expression at the Lbx1/Fgf8 locus resolve split-hand/foot malformation type 3. Nat Commun 2023; 14:1475. [PMID: 36928426 PMCID: PMC10020157 DOI: 10.1038/s41467-023-37057-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 03/01/2023] [Indexed: 03/18/2023] Open
Abstract
Split-Hand/Foot Malformation type 3 (SHFM3) is a congenital limb malformation associated with tandem duplications at the LBX1/FGF8 locus. Yet, the disease patho-mechanism remains unsolved. Here we investigate the functional consequences of SHFM3-associated rearrangements on chromatin conformation and gene expression in vivo in transgenic mice. We show that the Lbx1/Fgf8 locus consists of two separate, but interacting, regulatory domains. Re-engineering of a SHFM3-associated duplication and a newly reported inversion in mice results in restructuring of the chromatin architecture. This leads to ectopic activation of the Lbx1 and Btrc genes in the apical ectodermal ridge (AER) in an Fgf8-like pattern induced by AER-specific enhancers of Fgf8. We provide evidence that the SHFM3 phenotype is the result of a combinatorial effect on gene misexpression in the developing limb. Our results reveal insights into the molecular mechanism underlying SHFM3 and provide conceptual framework for how genomic rearrangements can cause gene misexpression and disease.
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Affiliation(s)
- Giulia Cova
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany.
- Institute of Medical and Human Genetics, Charité Universitätsmedizin Berlin, Berlin, 10117, Germany.
- Department of Pathology, New York University School of Medicine, Langone Health Medical Center, New York, NY, 10016, USA.
| | - Juliane Glaser
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany
| | - Robert Schöpflin
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany
- Institute of Medical and Human Genetics, Charité Universitätsmedizin Berlin, Berlin, 10117, Germany
- Department of Computational Molecular Biology, Max Planck Institute for Molecular Genetics, Berlin, 14195, Germany
| | - Cesar Augusto Prada-Medina
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, OX3 7FY, UK
| | - Salaheddine Ali
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany
- Institute of Medical and Human Genetics, Charité Universitätsmedizin Berlin, Berlin, 10117, Germany
| | - Martin Franke
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany
- Institute of Medical and Human Genetics, Charité Universitätsmedizin Berlin, Berlin, 10117, Germany
- Centro Andaluz de Biología del Desarrollo, Consejo Superior de Investigaciones Científicas/Universidad Pablo de Olavide, Seville, 41013, Spain
| | - Rita Falcone
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany
| | - Miriam Federer
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany
- Universität Innsbruck, Innsbruck, 6020, Austria
| | - Emanuela Ponzi
- Medical Genetics Unit, Department of Reproductive Medicine, ASL Bari, Bari, 70131, Italy
| | - Romina Ficarella
- Medical Genetics Unit, Department of Reproductive Medicine, ASL Bari, Bari, 70131, Italy
| | | | - Lars Wittler
- Department of Developmental Genetics, Transgenic Unit, Max Planck Institute for Molecular Genetics, Berlin, 14195, Germany
| | - Bernd Timmermann
- Sequencing Core Facility, Max Planck Institute for Molecular Genetics, Berlin, 14195, Germany
| | - Mattia Gentile
- Medical Genetics Unit, Department of Reproductive Medicine, ASL Bari, Bari, 70131, Italy
| | - Orsetta Zuffardi
- Department of Molecular Medicine, University of Pavia, Pavia, 27100, Italy
| | - Malte Spielmann
- Institute of Human Genetics, Universitätsklinikum Schleswig Holstein Campus Kiel and Christian-Albrechts-Universität, Kiel, 24118, Germany
- Institute of Human Genetics, University of Lübeck, Lübeck, Germany
- Human Molecular Genomics Group, Max Planck Institute for Molecular Genetics, Berlin, 14195, Germany
| | - Stefan Mundlos
- Max Planck Institute for Molecular Genetics, RG Development & Disease, Berlin, 14195, Germany.
- Institute of Medical and Human Genetics, Charité Universitätsmedizin Berlin, Berlin, 10117, Germany.
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Charité Universitätsmedizin Berlin, Berlin, 13353, Germany.
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5
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Kabirova E, Nurislamov A, Shadskiy A, Smirnov A, Popov A, Salnikov P, Battulin N, Fishman V. Function and Evolution of the Loop Extrusion Machinery in Animals. Int J Mol Sci 2023; 24:ijms24055017. [PMID: 36902449 PMCID: PMC10003631 DOI: 10.3390/ijms24055017] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 02/25/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023] Open
Abstract
Structural maintenance of chromosomes (SMC) complexes are essential proteins found in genomes of all cellular organisms. Essential functions of these proteins, such as mitotic chromosome formation and sister chromatid cohesion, were discovered a long time ago. Recent advances in chromatin biology showed that SMC proteins are involved in many other genomic processes, acting as active motors extruding DNA, which leads to the formation of chromatin loops. Some loops formed by SMC proteins are highly cell type and developmental stage specific, such as SMC-mediated DNA loops required for VDJ recombination in B-cell progenitors, or dosage compensation in Caenorhabditis elegans and X-chromosome inactivation in mice. In this review, we focus on the extrusion-based mechanisms that are common for multiple cell types and species. We will first describe an anatomy of SMC complexes and their accessory proteins. Next, we provide biochemical details of the extrusion process. We follow this by the sections describing the role of SMC complexes in gene regulation, DNA repair, and chromatin topology.
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Affiliation(s)
- Evelyn Kabirova
- Institute of Cytology and Genetics SB RAS, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Artem Nurislamov
- Institute of Cytology and Genetics SB RAS, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Artem Shadskiy
- Institute of Cytology and Genetics SB RAS, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Alexander Smirnov
- Institute of Cytology and Genetics SB RAS, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Andrey Popov
- Institute of Cytology and Genetics SB RAS, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Pavel Salnikov
- Institute of Cytology and Genetics SB RAS, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Nariman Battulin
- Institute of Cytology and Genetics SB RAS, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Veniamin Fishman
- Institute of Cytology and Genetics SB RAS, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
- Artificial Intelligence Research Institute (AIRI), 121108 Moscow, Russia
- Correspondence:
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6
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The Drosophila Fab-7 boundary modulates Abd-B gene activity by guiding an inversion of collinear chromatin organization and alternate promoter use. Cell Rep 2023; 42:111967. [PMID: 36640345 DOI: 10.1016/j.celrep.2022.111967] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 10/09/2022] [Accepted: 12/20/2022] [Indexed: 01/06/2023] Open
Abstract
Hox genes encode transcription factors that specify segmental identities along the anteroposterior body axis. These genes are organized in clusters, where their order corresponds to their activity along the body axis, a feature known as collinearity. In Drosophila, the BX-C cluster contains the three most posterior Hox genes, where their collinear activation incorporates progressive changes in histone modifications, chromatin architecture, and use of boundary elements and cis-regulatory regions. To dissect functional hierarchies, we compare chromatin organization in cell lines and larvae, with a focus on the Abd-B gene. Our work establishes the importance of the Fab-7 boundary for insulation between 3D domains carrying different histone modifications. Interestingly, we detect a non-canonical inversion of collinear chromatin dynamics at Abd-B, with the domain of active histone modifications progressively decreasing in size. This dynamic chromatin organization differentially activates the alternative promoters of the Abd-B gene, thereby expanding the possibilities for fine-tuning of transcriptional output.
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7
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Bauer M, Payer B, Filion GJ. Causality in transcription and genome folding: Insights from X inactivation. Bioessays 2022; 44:e2200105. [PMID: 36028473 DOI: 10.1002/bies.202200105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 08/11/2022] [Accepted: 08/14/2022] [Indexed: 11/10/2022]
Abstract
The spatial organization of genomes is becoming increasingly understood. In mammals, where it is most investigated, this organization ties in with transcription, so an important research objective is to understand whether gene activity is a cause or a consequence of genome folding in space. In this regard, the phenomena of X-chromosome inactivation and reactivation open a unique window of investigation because of the singularities of the inactive X chromosome. Here we focus on the cause-consequence nexus between genome conformation and transcription and explain how recent results about the structural changes associated with inactivation and reactivation of the X chromosome shed light on this problem.
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Affiliation(s)
- Moritz Bauer
- Oncode Institute, Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, The Netherlands
| | - Bernhard Payer
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Guillaume J Filion
- Dept. Biological Sciences, University of Toronto Scarborough, Toronto, ON, Canada
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Bakloushinskaya I. Chromosome Changes in Soma and Germ Line: Heritability and Evolutionary Outcome. Genes (Basel) 2022; 13:genes13040602. [PMID: 35456408 PMCID: PMC9029507 DOI: 10.3390/genes13040602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/25/2022] [Accepted: 03/26/2022] [Indexed: 12/13/2022] Open
Abstract
The origin and inheritance of chromosome changes provide the essential foundation for natural selection and evolution. The evolutionary fate of chromosome changes depends on the place and time of their emergence and is controlled by checkpoints in mitosis and meiosis. Estimating whether the altered genome can be passed to subsequent generations should be central when we consider a particular genome rearrangement. Through comparative analysis of chromosome rearrangements in soma and germ line, the potential impact of macromutations such as chromothripsis or chromoplexy appears to be fascinating. What happens with chromosomes during the early development, and which alterations lead to mosaicism are other poorly studied but undoubtedly essential issues. The evolutionary impact can be gained most effectively through chromosome rearrangements arising in male meiosis I and in female meiosis II, which are the last divisions following fertilization. The diversity of genome organization has unique features in distinct animals; the chromosome changes, their internal relations, and some factors safeguarding genome maintenance in generations under natural selection were considered for mammals.
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Affiliation(s)
- Irina Bakloushinskaya
- Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 119334 Moscow, Russia
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Zuccarello D, Sorrentino U, Brasson V, Marin L, Piccolo C, Capalbo A, Andrisani A, Cassina M. Epigenetics of pregnancy: looking beyond the DNA code. J Assist Reprod Genet 2022; 39:801-816. [PMID: 35301622 PMCID: PMC9050975 DOI: 10.1007/s10815-022-02451-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 03/01/2022] [Indexed: 12/19/2022] Open
Abstract
Epigenetics is the branch of genetics that studies the different mechanisms that influence gene expression without direct modification of the DNA sequence. An ever-increasing amount of evidence suggests that such regulatory processes may play a pivotal role both in the initiation of pregnancy and in the later processes of embryonic and fetal development, thus determining long-term effects even in adult life. In this narrative review, we summarize the current knowledge on the role of epigenetics in pregnancy, from its most studied and well-known mechanisms to the new frontiers of epigenetic regulation, such as the role of ncRNAs and the effects of the gestational environment on fetal brain development. Epigenetic mechanisms in pregnancy are a dynamic phenomenon that responds both to maternal-fetal and environmental factors, which can influence and modify the embryo-fetal development during the various gestational phases. Therefore, we also recapitulate the effects of the most notable environmental factors that can affect pregnancy and prenatal development, such as maternal nutrition, stress hormones, microbiome, and teratogens, focusing on their ability to cause epigenetic modifications in the gestational environment and ultimately in the fetus. Despite the promising advancements in the knowledge of epigenetics in pregnancy, more experience and data on this topic are still needed. A better understanding of epigenetic regulation in pregnancy could in fact prove valuable towards a better management of both physiological pregnancies and assisted reproduction treatments, other than allowing to better comprehend the origin of multifactorial pathological conditions such as neurodevelopmental disorders.
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Affiliation(s)
- Daniela Zuccarello
- Clinical Genetics Unit, Department of Women's and Children's Health, University Hospital of Padova, Padua, Italy.
| | - Ugo Sorrentino
- Clinical Genetics Unit, Department of Women's and Children's Health, University Hospital of Padova, Padua, Italy
| | - Valeria Brasson
- Clinical Genetics Unit, Department of Women's and Children's Health, University Hospital of Padova, Padua, Italy
| | - Loris Marin
- Gynaecological Clinic, Department of Women's and Children's Health, University of Padua, Padua, Italy
| | - Chiara Piccolo
- Clinical Genetics Unit, Department of Women's and Children's Health, University Hospital of Padova, Padua, Italy
| | | | - Alessandra Andrisani
- Gynaecological Clinic, Department of Women's and Children's Health, University of Padua, Padua, Italy
| | - Matteo Cassina
- Clinical Genetics Unit, Department of Women's and Children's Health, University Hospital of Padova, Padua, Italy
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