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Zhong Y, Wang G, Yang S, Zhang Y, Wang X. The role of DNA damage in neural stem cells ageing. J Cell Physiol 2024; 239:e31187. [PMID: 38219047 DOI: 10.1002/jcp.31187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 11/17/2023] [Accepted: 12/20/2023] [Indexed: 01/15/2024]
Abstract
Neural stem cells (NSCs) are pluripotent stem cells with the potential to differentiate into a variety of nerve cells. NSCs are susceptible to both intracellular and extracellular insults, thus causing DNA damage. Extracellular insults include ultraviolet, ionizing radiation, base analogs, modifiers, alkyl agents and others, while intracellular factors include Reactive oxygen species (ROS) radicals produced by mitochondria, mismatches that occur during DNA replication, deamination of bases, loss of bases, and more. When encountered with DNA damage, cells typically employ three coping strategies: DNA repair, damage tolerance, and apoptosis. NSCs, like many other stem cells, have the ability to divide, differentiate, and repair DNA damage to prevent mutations from being passed down to the next generation. However, when DNA damage accumulates over time, it will lead to a series of alterations in the metabolism of cells, which will cause cellular ageing. The ageing and exhaustion of neural stem cell will have serious effects on the body, such as neurodegenerative diseases. The purpose of this review is to examine the processes by which DNA damage leads to NSCs ageing and the mechanisms of DNA repair in NSCs.
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Affiliation(s)
- Yiming Zhong
- School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Guangming Wang
- School of Medicine, Postdoctoral Station of Clinical Medicine, Shanghai Tongji Hospital, Tongji University, Shanghai, China
| | - Shangzhi Yang
- School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yang Zhang
- Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Xianli Wang
- School of Public Health, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
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2
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Lapehn S, Colacino JA, Harris C. Spatiotemporal protein dynamics during early organogenesis in mouse conceptuses treated with valproic acid. Neurotoxicol Teratol 2023; 99:107286. [PMID: 37442398 PMCID: PMC10697214 DOI: 10.1016/j.ntt.2023.107286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 05/29/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023]
Abstract
Valproic acid (VPA) is an anti-epileptic medication that increases the risk of neural tube defect (NTD) outcomes in infants exposed during gestation. Previous studies into VPA's mechanism of action have focused on alterations in gene expression and metabolism but have failed to consider how exposure changes the abundance of critical developmental proteins over time. This study evaluates the effects of VPA on protein abundance in the developmentally distinct tissues of the mouse visceral yolk sac (VYS) and embryo proper (EMB) using mouse whole embryo culture. Embryos were exposed to 600 μM VPA at 2 h intervals over 10 h during early organogenesis with the aim of identifying protein pathways relevant to VPA's mechanism of action in failed NTC. Protein abundance was measured through tandem mass tag (TMT) labeling followed by liquid chromatography and mass spectrometry. Overall, there were over 1500 proteins with altered abundance after VPA exposure in the EMB or VYS with 428 of these proteins showing previous gene expression associations with VPA exposure. Limited overlap of significant proteins between tissues supported the conclusion of independent roles for the VYS and EMB in response to VPA. Pathway analysis of proteins with increased or decreased abundance identified multiple pathways with mechanistic relevance to NTC and embryonic development including convergent extension, Wnt Signaling/planar cell polarity, cellular migration, cellular proliferation, cell death, and cytoskeletal organization processes as targets of VPA. Clustering of co-regulated proteins to identify shared patterns of protein abundance over time highlighted 4 h and 6/10 h as periods of divergent protein abundance between control and VPA-treated samples in the VYS and EMB, respectively. Overall, this study demonstrated that VPA temporally alters protein content in critical developmental pathways in the VYS and the EMB during early organogenesis in mice.
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Affiliation(s)
- Samantha Lapehn
- Department of Environmental Health Sciences, University of Michigan, Ann Arbor, MI, United States.
| | - Justin A Colacino
- Department of Environmental Health Sciences, University of Michigan, Ann Arbor, MI, United States
| | - Craig Harris
- Department of Environmental Health Sciences, University of Michigan, Ann Arbor, MI, United States
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3
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Gök V, Erdem Ş, Haliloğlu Y, Bişgin A, Belkaya S, Başaran KE, Canatan MF, Özcan A, Yılmaz E, Acıpayam C, Karakükcü M, Canatan H, Per H, Patıroğlu T, Eken A, Ünal E. Immunodeficiency associated with a novel functionally defective variant of SLC19A1 benefits from folinic acid treatment. Genes Immun 2023; 24:12-20. [PMID: 36517554 DOI: 10.1038/s41435-022-00191-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 11/28/2022] [Accepted: 12/01/2022] [Indexed: 12/23/2022]
Abstract
Insufficient dietary folate intake, hereditary malabsorption, or defects in folate transport may lead to combined immunodeficiency (CID). Although loss of function mutations in the major intestinal folate transporter PCFT/SLC46A1 was shown to be associated with CID, the evidence for pathogenic variants of RFC/SLC19A1 resulting in immunodeficiency was lacking. We report two cousins carrying a homozygous pathogenic variant c.1042 G > A, resulting in p.G348R substitution who showed symptoms of immunodeficiency associated with defects of folate transport. SLC19A1 expression by peripheral blood mononuclear cells (PBMC) was quantified by real-time qPCR and immunostaining. T cell proliferation, methotrexate resistance, NK cell cytotoxicity, Treg cells and cytokine production by T cells were examined by flow cytometric assays. Patients were treated with and benefited from folinic acid. Studies revealed normal NK cell cytotoxicity, Treg cell counts, and naive-memory T cell percentages. Although SLC19A1 mRNA and protein expression were unaltered, remarkably, mitogen induced-T cell proliferation was significantly reduced at suboptimal folic acid and supraoptimal folinic acid concentrations. In addition, patients' PBMCs were resistant to methotrexate-induced apoptosis supporting a functionally defective SLC19A1. This study presents the second pathogenic SLC19A1 variant in the literature, providing the first experimental evidence that functionally defective variants of SLC19A1 may present with symptoms of immunodeficiency.
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Affiliation(s)
- Veysel Gök
- Department of Pediatrics, Division of Pediatric Hematology & Oncology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Şerife Erdem
- Genome and Stem Cell Center (GENKOK), Erciyes University, Kayseri, Türkiye.,Department of Medical Biology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Yeşim Haliloğlu
- Genome and Stem Cell Center (GENKOK), Erciyes University, Kayseri, Türkiye.,Department of Medical Biology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Atıl Bişgin
- Department of Medical Genetics, Faculty of Medicine, Çukurova University, Adana, Türkiye
| | - Serkan Belkaya
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, Ankara, Türkiye
| | - Kemal Erdem Başaran
- Department of Physiology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | | | - Alper Özcan
- Department of Pediatrics, Division of Pediatric Hematology & Oncology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Ebru Yılmaz
- Department of Pediatrics, Division of Pediatric Hematology & Oncology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Can Acıpayam
- Department of Pediatrics, Division of Pediatric Hematology & Oncology, Faculty of Medicine, Sütçü İmam University, Kahramanmaraş, Türkiye
| | - Musa Karakükcü
- Department of Pediatrics, Division of Pediatric Hematology & Oncology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Halit Canatan
- Department of Medical Biology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Hüseyin Per
- Department of Pediatrics, Division of Pediatric Neurology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Türkan Patıroğlu
- Department of Pediatrics, Division of Pediatric Hematology & Oncology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye.,Department of Pediatrics, Division of Pediatric Immunology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye
| | - Ahmet Eken
- Genome and Stem Cell Center (GENKOK), Erciyes University, Kayseri, Türkiye. .,Department of Medical Biology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye.
| | - Ekrem Ünal
- Department of Pediatrics, Division of Pediatric Hematology & Oncology, Faculty of Medicine, Erciyes University, Kayseri, Türkiye. .,Genome and Stem Cell Center (GENKOK), Erciyes University, Kayseri, Türkiye. .,Department of Blood Banking and Transfusion Medicine, Health Science Institution, Erciyes University, Kayseri, Türkiye.
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4
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Alata Jimenez N, Strobl-Mazzulla PH. Folate Carrier Deficiency Drives Differential Methylation and Enhanced Cellular Potency in the Neural Plate Border. Front Cell Dev Biol 2022; 10:834625. [PMID: 35912103 PMCID: PMC9326018 DOI: 10.3389/fcell.2022.834625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 06/07/2022] [Indexed: 11/28/2022] Open
Abstract
The neural plate border (NPB) of vertebrate embryos segregates from the neural and epidermal regions, and it is comprised of an intermingled group of multipotent progenitor cells. Folate is the precursor of S-adenosylmethionine, the main methyl donor for DNA methylation, and it is critical for embryonic development, including the specification of progenitors which reside in the NPB. Despite the fact that several intersecting signals involved in the specification and territorial restriction of NPB cells are known, the role of epigenetics, particularly DNA methylation, has been a matter of debate. Here, we examined the temporal and spatial distribution of the methyl source and analyzed the abundance of 5mC/5 hmC and their epigenetic writers throughout the segregation of the neural and NPB territories. Reduced representation bisulfite sequencing (RRBS) on Reduced Folate Carrier 1 (RFC1)-deficient embryos leads to the identification of differentially methylated regions (DMRs). In the RFC1-deficient embryos, we identified several DMRs in the Notch1 locus, and the spatiotemporal expression of Notch1 and its downstream target gene Bmp4 were expanded in the NPB. Cell fate analysis on folate deficient embryos revealed a significant increase in the number of cells coexpressing both neural (SOX2) and NPB (PAX7) markers, which may represent an enhancing effect in the cellular potential of those progenitors. Taken together, our findings propose a model where the RFC1 deficiency drives methylation changes in specific genomic regions that are correlated with a dysregulation of pathways involved in early development such as Notch1 and BMP4 signaling. These changes affect the potency of the progenitors residing in the juncture of the neural plate and NPB territories, thus driving them to a primed state.
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Li Z, Li W, Zhou D, Zhao J, Ma Y, Huang L, Dong C, Wilson JX, Huang G. Alleviating Oxidative Damage-Induced Telomere Attrition: a Potential Mechanism for Inhibition by Folic Acid of Apoptosis in Neural Stem Cells. Mol Neurobiol 2021; 59:590-602. [PMID: 34741234 DOI: 10.1007/s12035-021-02623-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 10/26/2021] [Indexed: 01/07/2023]
Abstract
DNA oxidative damage can cause telomere attrition or dysfunction that triggers cell senescence and apoptosis. The hypothesis of this study is that folic acid decreases apoptosis in neural stem cells (NSCs) by preventing oxidative stress-induced telomere attrition. Primary cultures of NSCs were incubated for 9 days with various concentrations of folic acid (0-40 µM) and then incubated for 24 h with a combination of folic acid and an oxidant (100-µM hydrogen peroxide, H2O2), antioxidant (10-mM N-acetyl-L-cysteine, NAC), or vehicle. Intracellular folate concentration, apoptosis rate, cell proliferative capacity, telomere length, telomeric DNA oxidative damage, telomerase activity, intracellular reactive oxygen species (ROS) levels, cellular oxidative damage, and intracellular antioxidant enzyme activities were determined. The results showed that folic acid deficiency in NSCs decreased intracellular folate concentration, cell proliferation, telomere length, and telomerase activity but increased apoptosis, telomeric DNA oxidative damage, and intracellular ROS levels. In contrast, folic acid supplementation dose-dependently increased intracellular folate concentration, cell proliferative capacity, telomere length, and telomerase activity but decreased apoptosis, telomeric DNA oxidative damage, and intracellular ROS levels. Exposure to H2O2 aggravated telomere attrition and oxidative damage, whereas NAC alleviated the latter. High doses of folic acid prevented telomere attrition and telomeric DNA oxidative damage by H2O2. In conclusion, inhibition of telomeric DNA oxidative damage and telomere attrition in NSCs may be potential mechanisms of inhibiting NSC apoptosis by folic acid.
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Affiliation(s)
- Zhenshu Li
- Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Wen Li
- Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
- Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin, 300070, China
- Center for International Collaborative Research On Environment, Nutrition and Public Health, Tianjin, 300070, China
| | - Dezheng Zhou
- Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Jing Zhao
- Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Yue Ma
- Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Ling Huang
- Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Cuixia Dong
- Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - John X Wilson
- Department of Exercise and Nutrition Sciences, School of Public Health and Health Professions, University at Buffalo, Buffalo, NY, 14214-8028, USA
| | - Guowei Huang
- Department of Nutrition and Food Science, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300070, China.
- Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin, 300070, China.
- Center for International Collaborative Research On Environment, Nutrition and Public Health, Tianjin, 300070, China.
- The Province and Ministry Co-Sponsored Collaborative Innovation Center for Medical Epigenetics, Tianjin Medical University, Tianjin, 300070, China.
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Folate Receptor Alpha Autoantibodies in Autism Spectrum Disorders: Diagnosis, Treatment and Prevention. J Pers Med 2021; 11:jpm11080710. [PMID: 34442354 PMCID: PMC8398778 DOI: 10.3390/jpm11080710] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 07/20/2021] [Accepted: 07/21/2021] [Indexed: 11/16/2022] Open
Abstract
Folate deficiency and folate receptor autoimmune disorder are major contributors to infertility, pregnancy related complications and abnormal fetal development including structural and functional abnormalities of the brain. Food fortification and prenatal folic acid supplementation has reduced the incidence of neural tube defect (NTD) pregnancies but is unlikely to prevent pregnancy-related complications in the presence of folate receptor autoantibodies (FRAb). In pregnancy, these autoantibodies can block folate transport to the fetus and in young children, folate transport to the brain. These antibodies are prevalent in neural tube defect pregnancies and in developmental disorders such as cerebral folate deficiency (CFD) syndrome and autism spectrum disorder (ASD). In the latter conditions, folinic acid treatment has shown clinical improvement in some of the core ASD deficits. Early testing for folate receptor autoantibodies and intervention is likely to result in a positive outcome. This review discusses the first identification of FRAb in women with a history of neural tube defect pregnancy and FRAb’s association with sub-fertility and preterm birth. Autoantibodies against folate receptor alpha (FRα) are present in about 70% of the children with a diagnosis of ASD, and a significant number of these children respond to oral folinic acid with overall improvements in speech, language and social interaction. The diagnosis of folate receptor autoimmune disorder by measuring autoantibodies against FRα in the serum provides a marker with the potential for treatment and perhaps preventing the pathologic consequences of folate receptor autoimmune disorder.
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7
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Sijilmassi O, Del Río Sevilla A, Maldonado Bautista E, Barrio Asensio MDC. Gestational folic acid deficiency alters embryonic eye development: Possible role of basement membrane proteins in eye malformations. Nutrition 2021; 90:111250. [PMID: 33962364 DOI: 10.1016/j.nut.2021.111250] [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: 01/16/2021] [Revised: 03/08/2021] [Accepted: 03/19/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVES Folic acid (FA) is crucial before and during early pregnancy. FA deficiency can occur because dietary FA intake is low in mothers at the time of conception. Likewise, various ocular pathologies are related to the alteration of extracellular matrices. The present study aimed to investigate the association between maternal FA deficiency and congenital eye defects. We also investigated whether maternal diet deficient in FA alters the expression of collagen IV and laminin-1 as a possible mechanism responsible for the appearance of ocular malformations. Both proteins are the main components of the basal lamina, and form an interlaced network that creates a relevant scaffold basement membrane. Basal laminae are involved in tissues maintenance and implicated in regulating many cellular processes. METHODS A total of 57 mouse embryos were classified into the following groups: Control group, (mothers were fed a standard rodent diet), and D2 and D8 groups (mothers were fed FA-deficient [FAD] diet for 2 or 8 wk, respectively). Female mice from group D2 were fed a FAD diet (0 mg/kg diet + 1% succinyl sulfathiazole used to block the synthesis of FA) for 2 wk from the day after mating until day 14.5 of gestation (E14.5). On the other hand, female mice from group D8 were fed a FAD diet for 8 wk (6 wk before conception and during the first 2 wk of pregnancy). For the data analysis, we first estimated the incidence of malformations in each group. Then, the statistical analysis was performed using IBM SPSS Statistics, version 25.0. Expression patterns of collagen IV and laminin-1 were examined with the immunohistochemical technique. RESULTS Our results showed that mice born to FA-deficient mothers had several congenital eye abnormalities. Embryos from dams fed a short-term FAD diet were found to have many significant abnormalities in both anterior and posterior segments, as well as choroidal vessel abnormalities. However, embryos from dams fed a long-term FAD diet had a significantly higher incidence of eye defects. Finally, maternal FA deficiency increased the expression of both collagen IV and laminin-1. Likewise, changes in the spatial localization and organization of collagen IV were observed. CONCLUSIONS A maternal FAD diet for a short-term period causes eye developmental defects and induces overexpression of both collagen IV and laminin-1. The malformations observed are probably related to alterations in the expression of basement membrane proteins.
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Affiliation(s)
- Ouafa Sijilmassi
- Universidad Complutense de Madrid, Faculty of Optics and Optometry, Anatomy and Embryology Department, Madrid, Spain.
| | - Aurora Del Río Sevilla
- Universidad Complutense de Madrid, Faculty of Optics and Optometry, Anatomy and Embryology Department, Madrid, Spain; Universidad Complutense de Madrid, Faculty of Medicine, Anatomy and Embryology Department, Madrid, Spain
| | - Estela Maldonado Bautista
- Universidad Complutense de Madrid, Faculty of Medicine, Anatomy and Embryology Department, Madrid, Spain
| | - María Del Carmen Barrio Asensio
- Universidad Complutense de Madrid, Faculty of Optics and Optometry, Anatomy and Embryology Department, Madrid, Spain; Universidad Complutense de Madrid, Faculty of Medicine, Anatomy and Embryology Department, Madrid, Spain
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8
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Seelan RS, Mukhopadhyay P, Philipose J, Greene RM, Pisano MM. Gestational folate deficiency alters embryonic gene expression and cell function. Differentiation 2020; 117:1-15. [PMID: 33302058 DOI: 10.1016/j.diff.2020.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 11/04/2020] [Accepted: 11/23/2020] [Indexed: 12/25/2022]
Abstract
Folic acid is a nutrient essential for embryonic development. Folate deficiency can cause embryonic lethality or neural tube defects and orofacial anomalies. Folate receptor 1 (Folr1) is a folate binding protein that facilitates the cellular uptake of dietary folate. To better understand the biological processes affected by folate deficiency, gene expression profiles of gestational day 9.5 (gd9.5) Folr1-/- embryos were compared to those of gd9.5 Folr1+/+ embryos. The expression of 837 genes/ESTs was found to be differentially altered in Folr1-/- embryos, relative to those observed in wild-type embryos. The 837 differentially expressed genes were subjected to Ingenuity Pathway Analysis. Among the major biological functions affected in Folr1-/- mice were those related to 'digestive system development/function', 'cardiovascular system development/function', 'tissue development', 'cellular development', and 'cell growth and differentiation', while the major canonical pathways affected were those associated with blood coagulation, embryonic stem cell transcription and cardiomyocyte differentiation (via BMP receptors). Cellular proliferation, apoptosis and migration were all significantly affected in the Folr1-/- embryos. Cranial neural crest cells (NCCs) and neural tube explants, grown under folate-deficient conditions, exhibited marked reduction in directed migration that can be attributed, in part, to an altered cytoskeleton caused by perturbations in F-actin formation and/or assembly. The present study revealed that several developmentally relevant biological processes were compromised in Folr1-/- embryos.
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Affiliation(s)
- R S Seelan
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development & Anomalies, University of Louisville Dental School, 501 S. Preston St., Louisville, KY, 40292, USA
| | - P Mukhopadhyay
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development & Anomalies, University of Louisville Dental School, 501 S. Preston St., Louisville, KY, 40292, USA
| | - J Philipose
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development & Anomalies, University of Louisville Dental School, 501 S. Preston St., Louisville, KY, 40292, USA
| | - R M Greene
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development & Anomalies, University of Louisville Dental School, 501 S. Preston St., Louisville, KY, 40292, USA.
| | - M M Pisano
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development & Anomalies, University of Louisville Dental School, 501 S. Preston St., Louisville, KY, 40292, USA
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Carinci F, Palmieri A, Scapoli L, Cura F, Borelli F, Morselli PG, Nouri N, Abdali H, Gianni AB, Russillo A, Docimo R, Martinelli M. Non-syndromic cleft palate: Association analysis on three gene polymorphisms of the folate pathway in Asian and Italian populations. Int J Immunopathol Pharmacol 2020; 33:2058738419858572. [PMID: 31663447 PMCID: PMC6822179 DOI: 10.1177/2058738419858572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Periconceptional folic acid supplementation can reduce the risk of inborn malformations, including orofacial clefts. Polymorphisms of MTHFR, TCN2, and CBS folate-related genes seem to modulate the risk of cleft lip with or without cleft palate (CL/P) in some populations. CL/P and cleft palate only (CPO) are different malformations that share several features and possibly etiological causes. In the present investigation, we conducted a family-based, candidate gene association study of non-syndromic CPO. Three single nucleotide polymorphisms, namely, rs1801133 of MTHFR, rs1801198 of TCN2, and rs4920037 of CBS, were investigated in a sample that included 129 Italian and 65 Asian families. No evidence of association between the three genotyped polymorphisms and CPO was found in the Italian and Asian cases, indeed the transmission disequilibrium test did not detect any asymmetry of transmission of alleles. This investigation, although with some limitation, further supports that CL/P and CPO diverge in their genetic background.
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Affiliation(s)
- Francesco Carinci
- Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, Ferrara, Italy
| | - Annalisa Palmieri
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Luca Scapoli
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Francesca Cura
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Francesco Borelli
- Plastic and Reconstructive Surgery Unit, Maugeri Clinical Scientific Institutes, Pavia, Italy
| | - Paolo Giovanni Morselli
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy.,Plastic Surgery Unit, Sant'Orsola Malpighi University Hospital, Bologna, Italy
| | - Nayereh Nouri
- Department of Genetics and Molecular Biology, Medical School, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Hossein Abdali
- Craniofacial and Cleft Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Aldo Bruno Gianni
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy.,Maxillofacial and Dental Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Antonio Russillo
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy.,Maxillofacial and Dental Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Raffaella Docimo
- Department of Clinical Sciences and Translational Medicine, University of Tor Vergata, Rome, Italy
| | - Marcella Martinelli
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
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10
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Alam C, Kondo M, O'Connor DL, Bendayan R. Clinical Implications of Folate Transport in the Central Nervous System. Trends Pharmacol Sci 2020; 41:349-361. [PMID: 32200980 DOI: 10.1016/j.tips.2020.02.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 02/19/2020] [Accepted: 02/21/2020] [Indexed: 12/11/2022]
Abstract
Folates are essential for key biosynthetic processes in mammalian cells and play a crucial role in the maintenance of central nervous system homeostasis. Mammals lack the metabolic capacity for folate biosynthesis; hence, folate requirements are largely met through dietary sources. To date, three major folate transport pathways have been characterized: the folate receptors (FRs), reduced folate carrier (RFC), and proton-coupled folate transporter (PCFT). This article reviews current knowledge on the role of folate transport systems in mediating folate delivery to vital tissues, particularly the brain, and how these pathways are modulated by various regulatory mechanisms. We will also briefly highlight the clinical significance of cerebral folate transport in relation to neurodevelopmental disorders associated with folate deficiency.
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Affiliation(s)
- Camille Alam
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
| | - Misaki Kondo
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
| | - Deborah L O'Connor
- Translational Medicine Program, The Hospital for Sick Children, 686 Bay Street, Toronto, Ontario M5G 0A4, Canada; Department of Nutritional Sciences, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Reina Bendayan
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada.
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Shin M, Vaughn A, Momb J, Appling DR. Deletion of neural tube defect-associated gene Mthfd1l causes reduced cranial mesenchyme density. Birth Defects Res 2019; 111:1520-1534. [PMID: 31518072 DOI: 10.1002/bdr2.1591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/17/2019] [Accepted: 08/26/2019] [Indexed: 12/21/2022]
Abstract
BACKGROUND Periconceptional intake of supplemental folic acid can reduce the incidence of neural tube defects by as much as 70%, but the mechanisms by which folic acid supports cellular processes during neural tube closure are unknown. The mitochondrial 10-formyl-tetrahydrofolate synthetase MTHFD1L catalyzes production of formate, thus generating one-carbon units for cytoplasmic processes. Deletion of Mthfd1l causes embryonic lethality, developmental delay, and neural tube defects in mice. METHODS To investigate the role of mitochondrial one-carbon metabolism during cranial neural tube closure, we have analyzed cellular morphology and function in neural tissues in Mthfd1l knockout embryos. RESULTS The head mesenchyme showed significantly lower cellular density in Mthfd1l nullizygous embryos compared to wildtype embryos during the process of neural tube closure. Apoptosis and neural crest cell specification were not affected by deletion of Mthfd1l. Sections from the cranial region of Mthfd1l knockout embryos exhibited decreased cellular proliferation, but only after completion of neural tube closure. Supplementation of pregnant dams with formate improved mesenchymal density and corrected cell proliferation in the nullizygous embryos. CONCLUSIONS Deletion of Mthfd1l causes decreased density in the cranial mesenchyme and this defect is improved with formate supplementation. This study reveals a mechanistic link between folate-dependent mitochondrially produced formate, head mesenchyme formation and neural tube defects.
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Affiliation(s)
- Minhye Shin
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
| | - Amanda Vaughn
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
| | - Jessica Momb
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
| | - Dean R Appling
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
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12
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Seelan RS, Pisano M, Greene RM. Nucleic acid methylation and orofacial morphogenesis. Birth Defects Res 2019; 111:1593-1610. [PMID: 31385455 DOI: 10.1002/bdr2.1564] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 07/17/2019] [Accepted: 07/19/2019] [Indexed: 12/19/2022]
Abstract
In this review, we highlight the current state of knowledge of the diverse roles nucleic acid methylation plays in the embryonic development of the orofacial region and how aberrant methylation may contribute to orofacial clefts. We also consider the role of methylation in the regulation of neural crest cell function as it pertains to orofacial ontogeny. Changes in DNA methylation, as a consequence of environmental effects, have been observed in the regulatory regions of several genes, potentially identifying new candidate genes for orofacial clefting and opening promising new avenues for further research. While the focus of this review is primarily on the nonsyndromic forms of orofacial clefting, syndromic forms are briefly discussed in the context of aberrant nucleic acid methylation.
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Affiliation(s)
- Ratnam S Seelan
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development and Anomalies, University of Louisville School of Dentistry, Louisville, Kentucky
| | - Michele Pisano
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development and Anomalies, University of Louisville School of Dentistry, Louisville, Kentucky
| | - Robert M Greene
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development and Anomalies, University of Louisville School of Dentistry, Louisville, Kentucky
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13
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Lukacs M, Roberts T, Chatuverdi P, Stottmann RW. Glycosylphosphatidylinositol biosynthesis and remodeling are required for neural tube closure, heart development, and cranial neural crest cell survival. eLife 2019; 8:45248. [PMID: 31232685 PMCID: PMC6611694 DOI: 10.7554/elife.45248] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 06/05/2019] [Indexed: 01/10/2023] Open
Abstract
Glycosylphosphatidylinositol (GPI) anchors attach nearly 150 proteins to the cell membrane. Patients with pathogenic variants in GPI biosynthesis genes develop diverse phenotypes including seizures, dysmorphic facial features and cleft palate through an unknown mechanism. We identified a novel mouse mutant (cleft lip/palate, edema and exencephaly; Clpex) with a hypo-morphic mutation in Post-Glycophosphatidylinositol Attachment to Proteins-2 (Pgap2), a component of the GPI biosynthesis pathway. The Clpex mutation decreases surface GPI expression. Surprisingly, Pgap2 showed tissue-specific expression with enrichment in the brain and face. We found the Clpex phenotype is due to apoptosis of neural crest cells (NCCs) and the cranial neuroepithelium. We showed folinic acid supplementation in utero can partially rescue the cleft lip phenotype. Finally, we generated a novel mouse model of NCC-specific total GPI deficiency. These mutants developed median cleft lip and palate demonstrating a previously undocumented cell autonomous role for GPI biosynthesis in NCC development.
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Affiliation(s)
- Marshall Lukacs
- Division of Human Genetics, Cincinnati Children's Medical Center, Cincinnati, United States.,Medical Scientist Training Program, Cincinnati Children's Medical Center, Cincinnati, United States
| | - Tia Roberts
- Division of Human Genetics, Cincinnati Children's Medical Center, Cincinnati, United States
| | - Praneet Chatuverdi
- Division of Developmental Biology, Cincinnati Children's Medical Center, Cincinnati, United States
| | - Rolf W Stottmann
- Division of Human Genetics, Cincinnati Children's Medical Center, Cincinnati, United States.,Medical Scientist Training Program, Cincinnati Children's Medical Center, Cincinnati, United States.,Division of Developmental Biology, Cincinnati Children's Medical Center, Cincinnati, United States.,Department of Pediatrics, University of Cincinnati, Cincinnati, United States
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14
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Sijilmassi O, López-Alonso JM, Del Río Sevilla A, Murillo González J, Barrio Asensio MDC. Biometric Alterations of Mouse Embryonic Eye Structures Due to Short-Term Folic Acid Deficiency. Curr Eye Res 2018; 44:428-435. [PMID: 30403890 DOI: 10.1080/02713683.2018.1545911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE Folic acid (FA) is an essential nutrient for normal embryonic development. FA deficiency (FAD) in maternal diet increases the risk of several defects among the progeny, especially, neural tube defects. The eye begins its development from the neural tube; however, the relationship between FAD and ocular development in the offspring has been little explored and it isn't known how the FAD affects the formation of the eye. Our objective was to analyze the effect of maternal FAD on mouse embryos ocular biometry. METHODS Female mice C57/BL/6J were distributed into three different groups, according to the assigned diet: control group fed a standard FA diet (2 mg FA/kg), FAD group for short term fed (0 mg FA/kg + 1% succinylsulfathiazole) from the day after mating until day 14.5 of gestation, and FAD group for long term fed the same FA-deficient diet for 6 weeks prior mating and continued with this diet during gestation. A total of 57 embryos (19 embryos of each dietary group) at 14.5 gestational days were evaluated. As indicators of changes in ocular biometry, we analyze two parameters: area and circularity of the lens and whole eye, and the area of the retina. The program used in the treatment and selection of the areas of interest was ImageJ. The statistical analysis was performed by IBM SPSS Statistics 19. RESULTS Regarding the measures of the area, FA-deficient lenses and eyes were smaller than that of controls. We have also observed increase in the size of the neural retina, spatially, in embryos from females fed FAD diet during long term. On the other hand, as regard to circularity measures, we have seen that eyes and lenses were more circular than control. CONCLUSION Maternal FAD diet for a very short term generates morphological changes in ocular structures to the offspring.
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Affiliation(s)
- Ouafa Sijilmassi
- a Faculty of Optics and Optometry, Anatomy and Human Embryology Department , Universidad Complutense De Madrid , Madrid , Spain.,b Faculty of Optics and Optometry, Optics Department , Universidad Complutense De Madrid , Madrid , Spain
| | - José Manuel López-Alonso
- b Faculty of Optics and Optometry, Optics Department , Universidad Complutense De Madrid , Madrid , Spain
| | - Aurora Del Río Sevilla
- a Faculty of Optics and Optometry, Anatomy and Human Embryology Department , Universidad Complutense De Madrid , Madrid , Spain
| | - Jorge Murillo González
- c Faculty of medicine, Anatomy and Human Embryology Department , Universidad Complutense De Madrid , Madrid , Spain
| | - María Del Carmen Barrio Asensio
- a Faculty of Optics and Optometry, Anatomy and Human Embryology Department , Universidad Complutense De Madrid , Madrid , Spain
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15
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Sijilmassi O, López-Alonso JM, Barrio Asensio MDC, Del Río Sevilla A. Alteration of lens and retina textures from mice embryos with folic acid deficiency: image processing analysis. Graefes Arch Clin Exp Ophthalmol 2018; 257:111-123. [PMID: 30392021 DOI: 10.1007/s00417-018-4176-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 10/15/2018] [Accepted: 10/25/2018] [Indexed: 12/25/2022] Open
Abstract
PURPOSE Folic acid (FA) is an essential vitamin for embryonic development. It plays particularly a critical role in RNA, DNA and protein synthesis. On the other hand, the collagen IV and laminin-1 are important proteins during embryonic development. This study was done to find if FA deficiency at a short and a long term in mothers could alter the tissue texture of retina and lens of the progeny. METHODS Collagen IV and laminin-1 were localized by immunohistochemistry in the lens and retina of the FA-deficient embryos. To carry out the image processing, texture segmentation was performed through canny edge detection and Fourier transform (FT). We defined a parameter, the grain size, to describe the texture of the lens and retina. A bootstrap method to estimate the distribution and confidence intervals of the mean, standard deviation, skewness and kurtosis of the grain size has been developed. RESULTS Analysis through image processing using Matlab showed changes in the grain size between control- and FA-deficient groups in both studied molecules. Measures of texture based on FT exhibited changes in the directionality and arrangements of type IV collagen and laminin-1. CONCLUSIONS Changes introduced by FA deficiency were visible in the short term (2 weeks) and evident in the long term (8 weeks) in both grain size and orientation of fibre structures in the tissues analysed (lens and retina). This is the first work devoted to study the effect of FA deficit in the texture of eye tissues using image processing techniques.
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Affiliation(s)
- Ouafa Sijilmassi
- Faculty of Optics and Optometry, Anatomy and Human Embryology Department, Universidad Complutense De Madrid, Avda. Arcos de Jalón, 118, 28037, Madrid, Spain. .,Faculty of Optics and Optometry, Optics Department, Universidad Complutense De Madrid, Avda. Arcos de Jalón, 118, 28037, Madrid, Spain.
| | - José Manuel López-Alonso
- Faculty of Optics and Optometry, Optics Department, Universidad Complutense De Madrid, Avda. Arcos de Jalón, 118, 28037, Madrid, Spain
| | - María Del Carmen Barrio Asensio
- Faculty of Optics and Optometry, Anatomy and Human Embryology Department, Universidad Complutense De Madrid, Avda. Arcos de Jalón, 118, 28037, Madrid, Spain
| | - Aurora Del Río Sevilla
- Faculty of Optics and Optometry, Anatomy and Human Embryology Department, Universidad Complutense De Madrid, Avda. Arcos de Jalón, 118, 28037, Madrid, Spain
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16
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Alata Jimenez N, Torres Pérez SA, Sánchez-Vásquez E, Fernandino JI, Strobl-Mazzulla PH. Folate deficiency prevents neural crest fate by disturbing the epigenetic Sox2 repression on the dorsal neural tube. Dev Biol 2018; 444 Suppl 1:S193-S201. [PMID: 30098999 DOI: 10.1016/j.ydbio.2018.08.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 08/03/2018] [Accepted: 08/03/2018] [Indexed: 12/22/2022]
Abstract
Folate deficiency has been known to contribute to neural tube and neural crest defects, but why these tissues are particularly affected, and which are the molecular mechanisms involved in those abnormalities are important human health questions that remain unanswered. Here we study the function of two of the main folate transporters, FolR1 and Rfc1, which are robustly expressed in these tissues. Folate is the precursor of S-adenosylmethionine, which is the main donor for DNA, protein and RNA methylation. Our results show that knockdown of FolR1 and/or Rfc1 reduced the abundance of histone H3 lysine and DNA methylation, two epigenetic modifications that play an important role during neural and neural crest development. Additionally, by knocking down folate transporter or pharmacologically inhibiting folate transport and metabolism, we observed ectopic Sox2 expression at the expense of neural crest markers in the dorsal neural tube. This is correlated with neural crest associated defects, with particular impact on orofacial formation. By using bisulfite sequencing, we show that this phenotype is consequence of reduced DNA methylation on the Sox2 locus at the dorsal neural tube, which can be rescued by the addition of folinic acid. Taken together, our in vivo results reveal the importance of folate as a source of the methyl groups necessary for the establishment of the correct epigenetic marks during neural and neural crest fate-restriction.
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Affiliation(s)
- Nagif Alata Jimenez
- Laboratory of Developmental Biology, Instituto Tecnológico de Chascomús (CONICET-UNSAM), Int Marino 8200, Chascomús 7130, Argentina
| | - Sergio A Torres Pérez
- Laboratory of Developmental Biology, Instituto Tecnológico de Chascomús (CONICET-UNSAM), Int Marino 8200, Chascomús 7130, Argentina
| | - Estefanía Sánchez-Vásquez
- Laboratory of Developmental Biology, Instituto Tecnológico de Chascomús (CONICET-UNSAM), Int Marino 8200, Chascomús 7130, Argentina
| | - Juan I Fernandino
- Laboratory of Developmental Biology, Instituto Tecnológico de Chascomús (CONICET-UNSAM), Int Marino 8200, Chascomús 7130, Argentina
| | - Pablo H Strobl-Mazzulla
- Laboratory of Developmental Biology, Instituto Tecnológico de Chascomús (CONICET-UNSAM), Int Marino 8200, Chascomús 7130, Argentina.
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17
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Sijilmassi O, López Alonso JM, Barrio Asensio MC, Del Río Sevilla A. Collagen IV and laminin-1 expression in embryonic mouse lens using principal components analysis technique. J Microsc 2018; 271:207-221. [PMID: 29702728 DOI: 10.1111/jmi.12709] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 04/09/2018] [Accepted: 04/10/2018] [Indexed: 12/16/2022]
Abstract
Immunohistochemistry section staining is not always easy to interpret. Manual quantification of immunohistochemical staining is limited by the observer visual ability to detect changes in level staining. Hence, the quantification of immunostaining by means of digital image analysis allows us to measure accurately protein expression percentages in immunobiological stained tissues and ensures to overcome the visual limitations. We perform an experimental study to analyse the impact of folic acid (FA) deficiency into collagen IV and laminin-1 expression in the embryonic mouse lens. The study starts with microscope images of embryos mouse lens whose mothers fed a diet deficient in FA during 2 and 8 weeks. A principal component analysis (PCA) image processing is used to analyse these images coming from control and FA deficit groups. The method permits to define an index of over- or infraexpression of collagen IV and laminin-1 associated to different spatial organisation structures (PC processes). Additionally, it permits to determine in precise percentage the exact quantity of the overexpression or infraexpression and finally to comprehend molecular regionalisation and expression in both control and deficient groups. The results suggest that even with 2 weeks of deficit of FA the expression and distribution of both molecules is affected.
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Affiliation(s)
- O Sijilmassi
- Faculty of Optics and Optometry, Anatomy and Human Embryology Department, Universidad Complutense De Madrid, Madrid, Spain
- Faculty of Optics and Optometry, Optics Department, Universidad Complutense De Madrid, Madrid, Spain
| | - J M López Alonso
- Faculty of Optics and Optometry, Optics Department, Universidad Complutense De Madrid, Madrid, Spain
| | - M C Barrio Asensio
- Faculty of Optics and Optometry, Anatomy and Human Embryology Department, Universidad Complutense De Madrid, Madrid, Spain
| | - A Del Río Sevilla
- Faculty of Optics and Optometry, Anatomy and Human Embryology Department, Universidad Complutense De Madrid, Madrid, Spain
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18
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Balashova OA, Visina O, Borodinsky LN. Folate action in nervous system development and disease. Dev Neurobiol 2018; 78:391-402. [PMID: 29380544 DOI: 10.1002/dneu.22579] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 01/24/2018] [Accepted: 01/24/2018] [Indexed: 01/04/2023]
Abstract
The vitamin folic acid has been recognized as a crucial environmental factor for nervous system development. From the early fetal stages of the formation of the presumptive spinal cord and brain to the maturation and maintenance of the nervous system during infancy and childhood, folate levels and its supplementation have been considered influential in the clinical outcome of infants and children affected by neurological diseases. Despite the vast epidemiological information recorded on folate function and neural tube defects, neural development and neurodegenerative diseases, the mechanisms of folate action in the developing neural tissue have remained elusive. Here we compiled studies that argue for a unique role for folate in nervous system development and function and its consequences to neural disease and repair. © 2018 Wiley Periodicals, Inc. Develop Neurobiol 78: 391-402, 2018.
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Affiliation(s)
- Olga A Balashova
- Department of Physiology & Membrane Biology and Institute for Pediatric Regenerative Medicine, Shriners Hospital for Children, University of California Davis School of Medicine, Sacramento, California
| | - Olesya Visina
- Department of Physiology & Membrane Biology and Institute for Pediatric Regenerative Medicine, Shriners Hospital for Children, University of California Davis School of Medicine, Sacramento, California
| | - Laura N Borodinsky
- Department of Physiology & Membrane Biology and Institute for Pediatric Regenerative Medicine, Shriners Hospital for Children, University of California Davis School of Medicine, Sacramento, California
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19
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Marini NJ, Yang W, Asrani K, Witte JS, Rine J, Lammer EJ, Shaw GM. Sequence variation in folate pathway genes and risks of human cleft lip with or without cleft palate. Am J Med Genet A 2016; 170:2777-2787. [PMID: 27604992 DOI: 10.1002/ajmg.a.37874] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 07/14/2016] [Indexed: 12/27/2022]
Abstract
In an effort to comprehensively interrogate genetic variation in the folate pathway for risk of cleft lip with or without cleft palate (CLP), we evaluated 504 common and rare variants in 35 folate-related genes in a panel of 330 infants with CLP and 367 non-malformed controls. Odds ratios (OR) with 95% confidence intervals were computed for common genotypes. A Case-Control Difference metric was calculated for rare variants to highlight differentially occurring alleles. Interactions between variants and a maternal folate intake variable were also evaluated. In gene-only results, significant odds ratios were observed for multiple variants in the BHMT/BHMT2/DMGDH gene cluster, particularly in Hispanic infants. Also in this cluster, rare variant analysis highlighted a substantial case-control difference in BHMT rs60340837 (synonymous Y284Y). In Hispanics, the ALDH1L1 I812V variant (rs4646750) was the most significant risk allele: OR = 3.8 (95%CI = 1.6-9.2) when heterozygous. In non-Hispanic white infants, we observed significant risk for AHCYL2 rs1095423 (homozygous OR = 3.0, 95%CI 1.1-7.8) and the 68 bp CBS insertion (c.844ins68; heterozygous OR = 2.4, 95%CI = 1.1-5.3). Rare variant analysis in this group revealed case-control differences in MTRR and several other methionine cycle genes, a process implicated previously in clefting risk. In women with low folate intake specifically, increased risks were observed for CBS rs2851391 (OR = 3.6, 95%CI = 1.3-9.6) and the R259P nonsynonymous variant of TCN2 (rs1801198; OR = 2.8, 95%CI = 1.2-6.3). This comprehensive study provides further direction on candidate loci to help disentangle the folate-related developmental phenomena in human clefting risk. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Nicholas J Marini
- Department of Molecular and Cellular Biology, California Institute for Quantitative Biosciences, University of California, Berkeley, California.
| | - Wei Yang
- Department of Pediatrics, Stanford University School of Medicine, Stanford, California
| | - Kripa Asrani
- Department of Molecular and Cellular Biology, California Institute for Quantitative Biosciences, University of California, Berkeley, California
| | - John S Witte
- Department of Epidemiology and Biostatistics and Institute of Human Genetics, University of California, San Francisco, California
| | - Jasper Rine
- Department of Molecular and Cellular Biology, California Institute for Quantitative Biosciences, University of California, Berkeley, California
| | - Edward J Lammer
- UCSF Benioff Children's Hospital Oakland, Oakland, California
| | - Gary M Shaw
- Department of Pediatrics, Stanford University School of Medicine, Stanford, California
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20
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Liu M, Wang G, Zhang SY, Zhong S, Qi GL, Wang CJ, Chuai M, Lee KKH, Lu DX, Yang X. From the Cover: Exposing Imidacloprid Interferes With Neurogenesis Through Impacting on Chick Neural Tube Cell Survival. Toxicol Sci 2016; 153:137-148. [DOI: 10.1093/toxsci/kfw111] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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21
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Jin Y, Wang G, Han SS, He MY, Cheng X, Ma ZL, Wu X, Yang X, Liu GS. Effects of oxidative stress on hyperglycaemia-induced brain malformations in a diabetes mouse model. Exp Cell Res 2016; 347:201-211. [PMID: 27497668 DOI: 10.1016/j.yexcr.2016.08.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Revised: 06/25/2016] [Accepted: 08/03/2016] [Indexed: 01/23/2023]
Abstract
Pregestational diabetes mellitus (PGDM) enhances the risk of fetal neurodevelopmental defects. However, the mechanism of hyperglycaemia-induced neurodevelopmental defects is not fully understood. In this study, several typical neurodevelopmental defects were identified in the streptozotocin-induced diabetes mouse model. The neuron-specific class III beta-tubulin/forkhead box P1-labelled neuronal differentiation was suppressed and glial fibrillary acidic protein-labelled glial cell lineage differentiation was slightly promoted in pregestational diabetes mellitus (PGDM) mice. Various concentrations of glucose did not change the U87 cell viability, but glial cell line-derived neurotrophic factor expression was altered with varying glucose concentrations. Mouse maternal hyperglycaemia significantly increased Tunel(+) apoptosis but did not dramatically affect PCNA(+) cell proliferation in the process. To determine the cause of increased apoptosis, we determined the SOD activity, the expression of Nrf2 as well as its downstream anti-oxidative factors NQO1 and HO1, and found that all of them significantly increased in PGDM fetal brains compared with controls. However, Nrf2 expression in U87 cells was not significantly changed by different glucose concentrations. In mouse telencephalon, we observed the co-localization of Tuj-1 and Nrf2 expression in neurons, and down-regulating of Nrf2 in SH-SY5Y cells altered the viability of SH-SY5Y cells exposed to high glucose concentrations. Taken together, the data suggest that Nrf2-modulated antioxidant stress plays a crucial role in maternal hyperglycaemia-induced neurodevelopmental defects.
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Affiliation(s)
- Ya Jin
- Department of Pediatrics, The First Affiliated Hospital, Jinan University, Guangzhou 510630, China
| | - Guang Wang
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China
| | - Sha-Sha Han
- Department of Pediatrics, The First Affiliated Hospital, Jinan University, Guangzhou 510630, China
| | - Mei-Yao He
- Department of Pediatrics, The First Affiliated Hospital, Jinan University, Guangzhou 510630, China
| | - Xin Cheng
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China
| | - Zheng-Lai Ma
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China
| | - Xia Wu
- Department of Pediatrics, The First Affiliated Hospital, Jinan University, Guangzhou 510630, China
| | - Xuesong Yang
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China.
| | - Guo-Sheng Liu
- Department of Pediatrics, The First Affiliated Hospital, Jinan University, Guangzhou 510630, China.
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Desai A, Sequeira JM, Quadros EV. The metabolic basis for developmental disorders due to defective folate transport. Biochimie 2016; 126:31-42. [DOI: 10.1016/j.biochi.2016.02.012] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 02/22/2016] [Indexed: 02/06/2023]
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23
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Mohanty V, Shah A, Allender E, Siddiqui MR, Monick S, Ichi S, Mania-Farnell B, G McLone D, Tomita T, Mayanil CS. Folate Receptor Alpha Upregulates Oct4, Sox2 and Klf4 and Downregulates miR-138 and miR-let-7 in Cranial Neural Crest Cells. Stem Cells 2016; 34:2721-2732. [PMID: 27300003 DOI: 10.1002/stem.2421] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 05/09/2016] [Accepted: 05/28/2016] [Indexed: 12/20/2022]
Abstract
Prenatal folic acid (FA) supplementation prevents neural tube defects. Folate receptor alpha (FRα) is critical for embryonic development, including neural crest (NC) development. Previously we showed that FRα translocates to the nucleus in response to FA, where it acts as a transcription factor. In this study, we examined if FA through interaction with FRα regulates stem cell characteristics of cranial neural crest cells (CNCCs)-critical for normal development. We hypothesized that FRα upregulates coding genes and simultaneously downregulates non-coding miRNA which targets coding genes in CNCCs. Quantitative RT-PCR and chromatin immunoprecipitation showed that FRα upregulates Oct4, Sox2, and Klf4 by binding to their cis-regulator elements-5' enhancer/promoters defined by H3K27Ac and p300 occupancy. FA via FRα downregulates miRNAs, miR-138 and miR-let-7, which target Oct4 and Trim71 (an Oct4 downstream effector), respectively. Co-immunoprecipitation data suggests that FRα interacts with the Drosha-DGCR8 complex to affect pre-miRNA processing. Transfecting anti-miR-138 or anti-miR-let-7 into non-proliferating neural crest cells (NCCs) derived from Splotch (Sp-/- ), restored their proliferation potential. In summary, these results suggest a novel pleiotropic role of FRα: (a) direct activation of Oct4, Sox2, and Klf4 genes; and (b) repression of biogenesis of miRNAs that target these genes or their effector molecules. Stem Cells 2016;34:2721-2732.
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Affiliation(s)
- Vineet Mohanty
- Developmental Biology Program, Stanley Manne Children's Research Institute, Division of Pediatric Neurosurgery, Ann and Robert H. Lurie Children's Hospital of Chicago, Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Amar Shah
- Developmental Biology Program, Stanley Manne Children's Research Institute, Division of Pediatric Neurosurgery, Ann and Robert H. Lurie Children's Hospital of Chicago, Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Elise Allender
- Developmental Biology Program, Stanley Manne Children's Research Institute, Division of Pediatric Neurosurgery, Ann and Robert H. Lurie Children's Hospital of Chicago, Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - M Rizwan Siddiqui
- Developmental Biology Program, Stanley Manne Children's Research Institute, Division of Pediatric Neurosurgery, Ann and Robert H. Lurie Children's Hospital of Chicago, Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Sarah Monick
- Developmental Biology Program, Stanley Manne Children's Research Institute, Division of Pediatric Neurosurgery, Ann and Robert H. Lurie Children's Hospital of Chicago, Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Shunsuke Ichi
- Department of Neurosurgery, Japanese Red Cross Medical Center, Shibuya-Ku, Tokyo, Japan
| | | | - David G McLone
- Developmental Biology Program, Stanley Manne Children's Research Institute, Division of Pediatric Neurosurgery, Ann and Robert H. Lurie Children's Hospital of Chicago, Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Tadanori Tomita
- Developmental Biology Program, Stanley Manne Children's Research Institute, Division of Pediatric Neurosurgery, Ann and Robert H. Lurie Children's Hospital of Chicago, Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Chandra Shekhar Mayanil
- Developmental Biology Program, Stanley Manne Children's Research Institute, Division of Pediatric Neurosurgery, Ann and Robert H. Lurie Children's Hospital of Chicago, Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
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The role of folate metabolism in orofacial development and clefting. Dev Biol 2015; 405:108-22. [PMID: 26144049 DOI: 10.1016/j.ydbio.2015.07.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 05/29/2015] [Accepted: 07/01/2015] [Indexed: 11/23/2022]
Abstract
Folate deficiency has been associated with numerous diseases and birth defects including orofacial defects. However, whether folate has a role in the face during early orofacial development has been unclear. The present study reveals that pharmacological and antisense oligonucleotide mediated inhibition of DHFR, an integral enzyme in the folate pathway, results in specific changes in the size and shape of the midface and embryonic mouth. Such defects are accompanied by a severe reduction in the muscle and cartilage jaw elements without significant change in neural crest pattern or global levels of methylation. We propose that the orofacial defects associated with DHFR deficient function are the result of decreased cell proliferation and increased cell death via DNA damage. In particular, localized apoptosis may also be depleting the cells of the face that express crucial genes for the differentiation of the jaw structures. Folate supplementation is widely known to reduce human risk for orofacial clefts. In the present study, we show that activating folate metabolism can reduce median oral clefts in the primary palate by increasing cell survival. Moreover, we demonstrate that a minor decrease in DHFR function exacerbates median facial clefts caused by RAR inhibition. This work suggests that folate deficiencies could be a major contributing factor to multifactorial orofacial defects.
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Mayanil CS, Ichi S, Farnell BM, Boshnjaku V, Tomita T, McLone DG. Maternal intake of folic acid and neural crest stem cells. VITAMINS AND HORMONES 2011; 87:143-73. [PMID: 22127242 DOI: 10.1016/b978-0-12-386015-6.00028-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Maternal folic acid (FA) intake has beneficial effects in preventing neural tube defects and may also play a role in the prevention of adult onset diseases such as Alzheimer's disease, dementia, neuropsychiatric disorders, cardiovascular diseases, and cerebral ischemia. This review will focus on the effects of maternal FA intake on neural crest stem cell proliferation and differentiation. Although FA is generally considered beneficial, it has the potential of promoting cell proliferation at the expense of differentiation. In some situations, this may lead to miscarriage or postnatal developmental abnormalities. Therefore, a blind approach such as "FA for everyone" is not necessarily the best course of action. Ultimately, the best approach for FA supplementation, and potentially other nutritional supplements, will include customized patient genomic profiles for determining dose and duration.
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Affiliation(s)
- Chandra S Mayanil
- Developmental Biology Program, Children's Memorial Research Center, Department of Pediatric Neurosurgery, Children's Memorial Medical Center and Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
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Murdoch JN, Copp AJ. The relationship between sonic Hedgehog signaling, cilia, and neural tube defects. BIRTH DEFECTS RESEARCH. PART A, CLINICAL AND MOLECULAR TERATOLOGY 2010; 88:633-52. [PMID: 20544799 PMCID: PMC3635124 DOI: 10.1002/bdra.20686] [Citation(s) in RCA: 144] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The Hedgehog signaling pathway is essential for many aspects of normal embryonic development, including formation and patterning of the neural tube. Absence of the sonic hedgehog (shh) ligand is associated with the midline defect holoprosencephaly, whereas increased Shh signaling is associated with exencephaly and spina bifida. To complicate this apparently simple relationship, mutation of proteins required for function of cilia often leads to impaired Shh signaling and to disruption of neural tube closure. In this article, we review the literature on Shh pathway mutants and discuss the relationship between Shh signaling, cilia, and neural tube defects.
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Affiliation(s)
- Jennifer N Murdoch
- Centre for Biomedical Sciences, School of Biological Sciences, Royal Holloway University of London, Egham, Surrey, UK.
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Yu W, Serrano M, Miguel SS, Ruest LB, Svoboda KK. Cleft lip and palate genetics and application in early embryological development. Indian J Plast Surg 2009; 42 Suppl:S35-50. [PMID: 19884679 PMCID: PMC2825058 DOI: 10.4103/0970-0358.57185] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The development of the head involves the interaction of several cell populations and coordination of cell signalling pathways, which when disrupted can cause defects such as facial clefts. This review concentrates on genetic contributions to facial clefts with and without cleft palate (CP). An overview of early palatal development with emphasis on muscle and bone development is blended with the effects of environmental insults and known genetic mutations that impact human palatal development. An extensive table of known genes in syndromic and non-syndromic CP, with or without cleft lip (CL), is provided. We have also included some genes that have been identified in environmental risk factors for CP/L. We include primary and review references on this topic.
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Affiliation(s)
- Wenli Yu
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, TX 75246
| | - Maria Serrano
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, TX 75246
| | - Symone San Miguel
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, TX 75246
| | - L. Bruno Ruest
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, TX 75246
| | - Kathy K.H. Svoboda
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, TX 75246
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28
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Gelineau-van Waes J, Heller S, Bauer LK, Wilberding J, Maddox JR, Aleman F, Rosenquist TH, Finnell RH. Embryonic development in the reduced folate carrier knockout mouse is modulated by maternal folate supplementation. ACTA ACUST UNITED AC 2008; 82:494-507. [PMID: 18383508 DOI: 10.1002/bdra.20453] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
BACKGROUND The reduced folate carrier (RFC1) is a ubiquitously expressed integral membrane protein that mediates delivery of 5-methyltetrahydrofolate into mammalian cells. In this study, embryonic/fetal development is characterized in an RFC1 knockout mouse model in which pregnant dams receive different levels of folate supplementation. METHODS RFC1(+/-) males were mated to RFC1(+/-) females, and pregnant dams were treated with vehicle (control) or folic acid (25 or 50 mg/kg) by daily subcutaneous injection (0.1 mL/10 g bwt), beginning on E0.5 and continuing throughout gestation until the time of sacrifice. RESULTS Without maternal folate supplementation, RFC1 nullizygous embryos die shortly postimplantation. Supplementation of pregnant dams with 25 mg/kg/day folic acid prolongs survival of mutant embryos until E9.5-E10.5, but they are developmentally delayed relative to wild-type littermates, display a marked absence of erythropoiesis, severe neural tube and limb bud defects, and failure of chorioallantoic fusion. Fgfr2 protein levels are significantly reduced or absent in the extraembryonic membranes of RFC1 nullizygous embryos. Maternal folate supplementation with 50 mg/kg/day results in survival of 22% of RFC1 mutants to E18.5, but they develop with multiple malformations of the eyelids, lungs, heart, and skin. CONCLUSIONS High doses of daily maternal folate supplementation during embryonic/fetal development are necessary for early postimplantation embryonic viability of RFC1 nullizygous embryos, and play a critical role in chorioallantoic fusion, erythropoiesis, and proper development of the neural tube, limbs, lungs, heart, and skin.
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Affiliation(s)
- Janee Gelineau-van Waes
- Department of Genetics, Cell Biology & Anatomy, University of Nebraska Medical Center, Omaha, Nebraska 68198-5455, USA.
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Two newly synthesized 5-methyltetrahydrofolate-like compounds inhibit methionine synthase activity accompanied by cell cycle arrest in G1/S phase and apoptosis in vitro. Anticancer Drugs 2008; 19:697-704. [DOI: 10.1097/cad.0b013e32830317f2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Taparia S, Gelineau-van Waes J, Rosenquist TH, Finnell RH. Importance of folate-homocysteine homeostasis during early embryonic development. Clin Chem Lab Med 2008; 45:1717-27. [PMID: 18067451 DOI: 10.1515/cclm.2007.345] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Although the beneficial effects of maternal folate supplementation in the periconceptional period have been shown to prevent neural tube defects, congenital heart defects and orofacial clefts, the exact protective mechanism of folates remains unknown. Folates affect DNA synthesis, amino acid metabolism and methylation of genes, proteins and lipids via S-adenosylmethionine-mediated one-carbon transfer reactions. Our laboratory has created several mouse knock out models of folate transport using gene targeting to inactivate folate receptor 1 (Folr1), folate receptor 2 (Folr2) and reduced folate carrier 1 (Slc19a1) genes. Gene ablation of both Folr1 and Slc19a1 leads to lethality, but with maternal folate supplementation, nullizygous embryos for both genes present with neural tube defects (NTDs) and congenital heart defects (CHDs). Folr1 nullizygous mice also exhibit orofacial clefts when the dams are provided with low folate supplementation during pregnancy. Finally, women with NTD-affected pregnancies have been reported to have high autoantibody titers against the folate receptor, potentially inhibiting the transport of folate to the developing embryo. This may be an explanation for some of the folate-responsive NTDs and perhaps other congenital malformations. Herein, we propose how homocysteinylation of the folate receptor may contribute to generation of these autoantibodies against the folate receptor.
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Affiliation(s)
- Shveta Taparia
- Center for Environmental and Genetic Medicine, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX 77030, USA
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Zhu H, Wlodarczyk BJ, Scott M, Yu W, Merriweather M, Gelineau-van Waes J, Schwartz RJ, Finnell RH. Cardiovascular abnormalities inFolr1 knockout mice and folate rescue. ACTA ACUST UNITED AC 2007; 79:257-68. [PMID: 17286298 DOI: 10.1002/bdra.20347] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Periconceptional folic acid supplementation is widely believed to aid in the prevention of neural tube defects (NTDs), orofacial clefts, and congenital heart defects. Folate-binding proteins or receptors serve to bind folic acid and 5-methyltetrahydrofolate, representing one of the two major mechanisms of cellular folate uptake. METHODS We herein describe abnormal cardiovascular development in mouse fetuses lacking a functional folate-binding protein gene (Folr1). We also performed a dose-response study with folinic acid and determined the impact of maternal folate supplementation on Folr1 nullizygous cardiac development. RESULTS Partially rescued preterm Folr1(-/-) (formerly referred to as Folbp1) fetuses were found to have outflow tract defects, aortic arch artery abnormalities, and isolated dextracardia. Maternal supplementation with folinic acid rescued the embryonic lethality and the observed cardiovascular phenotypes in a dose-dependant manner. Maternal genotype exhibited significant impact on the rescue efficiency, suggesting an important role of in utero folate status in embryonic development. Abnormal heart looping was observed during early development of Folr1(-/-) embryos partially rescued by maternal folinic acid supplementation. Migration pattern of cardiac neural crest cells, genetic signals in pharyngeal arches, and the secondary heart field were also found to be affected in the mutant embryos. CONCLUSIONS Our observations suggest that the beneficial effect of folic acid for congenital heart defects might be mediated via its impact on neural crest cells and by gene regulation of signaling pathways involved in the development of the pharyngeal arches and the secondary heart field.
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Affiliation(s)
- Huiping Zhu
- Center for Environmental and Genetic Medicine, Institute of Biosciences and Technology, Texas A and M University System Health Science Center, Houston, Texas, USA.
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Blom HJ, Shaw GM, den Heijer M, Finnell RH. Neural tube defects and folate: case far from closed. Nat Rev Neurosci 2006; 7:724-31. [PMID: 16924261 PMCID: PMC2970514 DOI: 10.1038/nrn1986] [Citation(s) in RCA: 332] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Neural tube closure takes place during early embryogenesis and requires interactions between genetic and environmental factors. Failure of neural tube closure is a common congenital malformation that results in morbidity and mortality. A major clinical achievement has been the use of periconceptional folic acid supplements, which prevents approximately 50-75% of cases of neural tube defects. However, the mechanism underlying the beneficial effects of folic acid is far from clear. Biochemical, genetic and epidemiological observations have led to the development of the methylation hypothesis, which suggests that folic acid prevents neural tube defects by stimulating cellular methylation reactions. Exploring the methylation hypothesis could direct us towards additional strategies to prevent neural tube defects.
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Affiliation(s)
- Henk J Blom
- Laboratory of Pediatrics and Neurology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Post Office Box 9101, 6500 HB Nijmegen, The Netherlands.
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Li D, Rozen R. Maternal folate deficiency affects proliferation, but not apoptosis, in embryonic mouse heart. J Nutr 2006; 136:1774-8. [PMID: 16772436 DOI: 10.1093/jn/136.7.1774] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Low dietary folate and deficiency of methylenetetrahydrofolate reductase (Mthfr) were reported to increase the risk for congenital heart defects, but contributory mechanisms have not been elucidated. Because low folate and absent MTHFR activity were shown to affect proliferation and apoptosis in developing neural tissue, we examined these processes in the myocardium of embryos from Mthfr +/+ and Mthfr +/- mice fed control diets (CD) or folic acid-deficient diets (FADD). Mice consumed the designated diets for 8 wk, from weaning and through pregnancy until they were killed. Embryos were assessed on gestational day 12.5 for myocardial proliferation by 5-bromo-2'-deoxyuridine (BrdU) labeling and for apoptosis by TdT-mediated dUTP nick end labeling staining and caspase 3/7 activity assays. FADD-treated dams had significantly higher resorption rates than CD-treated dams. Embryonic lengths and weights from FADD-treated dams were significantly lower than those from CD-treated dams; the smallest embryos were those of the Mthfr +/- dams that consumed the FADD, with effect of genotype tending to be significant (P = 0.09). The thickness of cardiac ventricular compact walls of embryos from FADD-treated dams was significantly reduced, and embryonic myocardium from FADD-treated dams had significantly fewer BrdU-labeled cells compared with CD-treated dams, with no differences in apoptosis due to the diets. Genotype did not affect proliferation or apoptosis. Our results suggest that proliferation of embryonic myocardium is sensitive to maternal dietary folate and that folate supplementation during pregnancy is important for normal heart development and prevention of heart defects.
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Affiliation(s)
- Deqiang Li
- Departments of Human Genetics, Pediatrics, and Biology, McGill University-Montreal Children's Hospital Research Institute, Montreal, PQ, Canada
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Zhu H, Yang W, Lu W, Zhang J, Shaw GM, Lammer EJ, Finnell RH. A known functional polymorphism (Ile120Val) of the human PCMT1 gene and risk of spina bifida. Mol Genet Metab 2006; 87:66-70. [PMID: 16256389 PMCID: PMC2947858 DOI: 10.1016/j.ymgme.2005.09.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2005] [Revised: 08/30/2005] [Accepted: 09/02/2005] [Indexed: 10/25/2022]
Abstract
Folate binding protein 1 (Folr1) knockout mice with low maternal folate concentrations have been shown to be excellent animal models for human folate-responsive neural tube defects (NTDs). Previous studies using the Folr1 knockout mice revealed that maternal folate supplementation up-regulates the expression of the PCMT1 gene in Folr1 nullizygous neural tube tissue during neural tube closure. PCMT1 encodes the protein repair enzyme l-isoaspartate (d-aspartate) O-methyltransferase (PIMT) that converts abnormal d-aspartyl and l-isoaspartyl residues to the normal l-aspartyl form. PIMT is known to protect certain neural cells from Bax-induced apoptosis. Pcmt1-deficient mice present with abnormal AdoMet/AdoHcy homeostasis. We hypothesized that a known functional polymorphism (Ile120Val) in the human PCMT1 gene is associated with an increased risk of folate-responsive human NTDs. A case-control study was conducted to investigate a possible association between this polymorphism and risk of spina bifida. Compared to the Ile/Ile and Ile/Val genotypes, the homozygous Val/Val genotype showed decreased risk for spina bifida (adjusted odds ratio=0.6, 95% confidence interval: 0.4-0.9). Our results showed that the Ile120Val polymorphism of PCMT1 gene is a genetic modifier for the risk of spina bifida. Val/Val genotype was associated with a reduction in risk for spina bifida.
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Affiliation(s)
- Huiping Zhu
- Center for Environmental and Genetic Medicine, Institute of Biosciences and Technology, Texas A&M University System Health Science Center, Houston, TX 77030, USA
| | - Wei Yang
- California Birth Defects Monitoring Program, Berkeley, CA, USA
| | - Wei Lu
- Center for Environmental and Genetic Medicine, Institute of Biosciences and Technology, Texas A&M University System Health Science Center, Houston, TX 77030, USA
| | - Jing Zhang
- Center for Environmental and Genetic Medicine, Institute of Biosciences and Technology, Texas A&M University System Health Science Center, Houston, TX 77030, USA
| | - Gary M. Shaw
- California Birth Defects Monitoring Program, Berkeley, CA, USA
| | - Edward J. Lammer
- Children’s Hospital Oakland Research Institute, Oakland, CA, USA
| | - Richard H. Finnell
- Center for Environmental and Genetic Medicine, Institute of Biosciences and Technology, Texas A&M University System Health Science Center, Houston, TX 77030, USA
- Center for Environmental and Rural Health, Texas A&M University, College Station, TX 77843, USA
- Corresponding author. Fax: +1 713 677 7790. (R.H. Finnell)
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