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Li J, Shi Q, Li X, Guo J, Zhang L, Quan Y, Ma M, Yang Y. The Effect of Male Sexual Abstinence Periods on the Clinical Outcomes of Fresh Embryo Transfer Cycles Following Assisted Reproductive Technology: A Meta-Analysis. Am J Mens Health 2021; 14:1557988320933758. [PMID: 32804026 PMCID: PMC7436826 DOI: 10.1177/1557988320933758] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
A sexual abstinence period (SAP) lasting for 2–7 days is recommended before undertaking semen analyses. However, there is no consensus regarding the length of the SAP for couples using assisted reproductive technology (ART). Therefore, a meta-analysis was performed to compare the effect of short SAPs (less than 4 days) and long SAPs (4–7 days) on the clinical outcomes of fresh embryo transfer cycles after ART. A total of four studies were included in the meta-analysis. Although the fertilization rate in short SAP couples was higher than that in long SAP couples, a pooled analysis demonstrated that it was not statistically significant (p = .09). The implantation rate was, however, significantly higher in short SAP couples (p = .0001). The pooled analysis revealed that the pregnancy rate was significantly higher in short SAP couples than that in long SAP couples. The overall odds ratio (OR) for the pregnancy rate was 1.44 (p = .0006). No significant difference in miscarriage rates between the short and long SAP couples was found (p = .88). The meta-analysis indicates that a shorter abstinence period could result in higher implantation and pregnancy rates for patients undertaking ART treatments.
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Affiliation(s)
- Jinhong Li
- Center of Reproductive Medicine, West China Second University Hospital, Sichuan University, Chengdu, Sichuan Province, China.,Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, Sichuan Province, China
| | - Qingquan Shi
- Center of Reproductive Medicine, West China Second University Hospital, Sichuan University, Chengdu, Sichuan Province, China.,Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, Sichuan Province, China
| | - Xiaohong Li
- Center of Reproductive Medicine, West China Second University Hospital, Sichuan University, Chengdu, Sichuan Province, China.,Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, Sichuan Province, China
| | - Junliang Guo
- Center of Reproductive Medicine, West China Second University Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Long Zhang
- Center of Reproductive Medicine, West China Second University Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Yi Quan
- Center of Reproductive Medicine, West China Second University Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Ming Ma
- Andrology Laboratory, West China Hospital, Chengdu, Sichuan Province, China
| | - Yihong Yang
- Center of Reproductive Medicine, West China Second University Hospital, Sichuan University, Chengdu, Sichuan Province, China.,Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, Sichuan Province, China
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Åsenius F, Danson AF, Marzi SJ. DNA methylation in human sperm: a systematic review. Hum Reprod Update 2021; 26:841-873. [PMID: 32790874 DOI: 10.1093/humupd/dmaa025] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 05/25/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Studies in non-human mammals suggest that environmental factors can influence spermatozoal DNA methylation, and some research suggests that spermatozoal DNA methylation is also implicated in conditions such as subfertility and imprinting disorders in the offspring. Together with an increased availability of cost-effective methods of interrogating DNA methylation, this premise has led to an increasing number of studies investigating the DNA methylation landscape of human spermatozoa. However, how the human spermatozoal DNA methylome is influenced by environmental factors is still unclear, as is the role of human spermatozoal DNA methylation in subfertility and in influencing offspring health. OBJECTIVE AND RATIONALE The aim of this systematic review was to critically appraise the quality of the current body of literature on DNA methylation in human spermatozoa, summarize current knowledge and generate recommendations for future research. SEARCH METHODS A comprehensive literature search of the PubMed, Web of Science and Cochrane Library databases was conducted using the search terms 'semen' OR 'sperm' AND 'DNA methylation'. Publications from 1 January 2003 to 2 March 2020 that studied human sperm and were written in English were included. Studies that used sperm DNA methylation to develop methodologies or forensically identify semen were excluded, as were reviews, commentaries, meta-analyses or editorial texts. The Grading of Recommendations, Assessment, Development and Evaluations (GRADE) criteria were used to objectively evaluate quality of evidence in each included publication. OUTCOMES The search identified 446 records, of which 135 were included in the systematic review. These 135 studies were divided into three groups according to area of research; 56 studies investigated the influence of spermatozoal DNA methylation on male fertility and abnormal semen parameters, 20 studies investigated spermatozoal DNA methylation in pregnancy outcomes including offspring health and 59 studies assessed the influence of environmental factors on spermatozoal DNA methylation. Findings from studies that scored as 'high' and 'moderate' quality of evidence according to GRADE criteria were summarized. We found that male subfertility and abnormal semen parameters, in particular oligozoospermia, appear to be associated with abnormal spermatozoal DNA methylation of imprinted regions. However, no specific DNA methylation signature of either subfertility or abnormal semen parameters has been convincingly replicated in genome-scale, unbiased analyses. Furthermore, although findings require independent replication, current evidence suggests that the spermatozoal DNA methylome is influenced by cigarette smoking, advanced age and environmental pollutants. Importantly however, from a clinical point of view, there is no convincing evidence that changes in spermatozoal DNA methylation influence pregnancy outcomes or offspring health. WIDER IMPLICATIONS Although it appears that the human sperm DNA methylome can be influenced by certain environmental and physiological traits, no findings have been robustly replicated between studies. We have generated a set of recommendations that would enhance the reliability and robustness of findings of future analyses of the human sperm methylome. Such studies will likely require multicentre collaborations to reach appropriate sample sizes, and should incorporate phenotype data in more complex statistical models.
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Affiliation(s)
| | - Amy F Danson
- German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Sarah J Marzi
- UK Dementia Research Institute, Imperial College London, London W12 0NN, UK.,Department of Brain Sciences, Imperial College London, London, UK
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Khezri A, Narud B, Stenseth EB, Johannisson A, Myromslien FD, Gaustad AH, Wilson RC, Lyle R, Morrell JM, Kommisrud E, Ahmad R. DNA methylation patterns vary in boar sperm cells with different levels of DNA fragmentation. BMC Genomics 2019; 20:897. [PMID: 31775629 PMCID: PMC6880426 DOI: 10.1186/s12864-019-6307-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 11/18/2019] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Sperm DNA integrity is considered essential for successful transmission of the paternal genome, fertilization and normal embryo development. DNA fragmentation index (DFI, %) has become a key parameter in the swine artificial insemination industry to assess sperm DNA integrity. Recently, in some elite Norwegian Landrace boars (boars with excellent field fertility records), a higher level of sperm DFI has been observed. In order to obtain a better understanding of this, and to study the complexity of sperm DNA integrity, liquid preserved semen samples from elite boars with contrasting DFI levels were examined for protamine deficiency, thiol profile and disulphide bonds. Additionally, the DNA methylation profiles of the samples were determined by reduced representation bisulphite sequencing (RRBS). RESULTS In this study, different traits related to sperm DNA integrity were investigated (n = 18 ejaculates). Upon liquid storage, the levels of total thiols and disulphide bonds decreased significantly, while the DFI and protamine deficiency level increased significantly. The RRBS results revealed similar global patterns of low methylation from semen samples with different levels of DFI (low, medium and high). Differential methylation analyses indicated that the number of differentially methylated cytosines (DMCs) increased in the low-high compared to the low-medium and the medium-high DFI groups. Annotating the DMCs with gene and CpG features revealed clear differences between DFI groups. In addition, the number of annotated transcription starting sites (TSS) and associated pathways in the low-high comparison was greater than the other two groups. Pathway analysis showed that genes (based on the closest TSS to DMCs) corresponding to low-high DFI comparison were associated with important processes such as membrane function, metabolic cascade and antioxidant defence system. CONCLUSION To our knowledge, this is the first study evaluating DNA methylation in boar sperm cells with different levels of DFI. The present study shows that sperm cells with varying levels of DNA fragmentation exhibit similar global methylation, but different site-specific DNA methylation signatures. Moreover, with increasing DNA fragmentation in spermatozoa, there is an increase in the number of potentially affected downstream genes and their respective regulatory pathways.
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Affiliation(s)
- Abdolrahman Khezri
- Department of Biotechnology, Inland Norway University of Applied Sciences, Hamar, Norway
| | - Birgitte Narud
- Department of Biotechnology, Inland Norway University of Applied Sciences, Hamar, Norway
| | - Else-Berit Stenseth
- Department of Biotechnology, Inland Norway University of Applied Sciences, Hamar, Norway
| | - Anders Johannisson
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | | | - Ann Helen Gaustad
- Department of Biotechnology, Inland Norway University of Applied Sciences, Hamar, Norway
- Topigs Norsvin, Hamar, Norway
| | - Robert C Wilson
- Department of Biotechnology, Inland Norway University of Applied Sciences, Hamar, Norway
| | - Robert Lyle
- Department of Medical Genetics and Norwegian Sequencing Centre, Oslo University Hospital and the University of Oslo, Oslo, Norway
| | - Jane M Morrell
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Elisabeth Kommisrud
- Department of Biotechnology, Inland Norway University of Applied Sciences, Hamar, Norway
| | - Rafi Ahmad
- Department of Biotechnology, Inland Norway University of Applied Sciences, Hamar, Norway.
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Laqqan M, Ahmed I, Yasin M, Hammadeh ME, Yassin M. Influence of variation in global sperm DNA methylation level on the expression level of protamine genes and human semen parameters. Andrologia 2019; 52:e13484. [PMID: 31762067 DOI: 10.1111/and.13484] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 10/11/2019] [Accepted: 10/15/2019] [Indexed: 12/16/2022] Open
Abstract
An infertility problem is a complex issue that affects 15% approximately of couples worldwide. The current study was designed to evaluate if there is a variation in the status of global DNA methylation among the study groups and to assess their impact on the protamine expression level and human semen parameters. Totalling 200 semen samples were collected from men (50 proved fertile, 60 normospermia and 90 oligospermia) with an average age of 34.9 ± 4.3 years. The DNA and RNA were isolated from purified spermatozoa; then, ELISA and qPCR were applied to estimate the status of global sperm DNA methylation and protamine expression level respectively. Besides that, the sperm chromatin decondensation and sperm DNA fragmentation were assessed. A significant variation was found in the global sperm DNA methylation and the protamine 1 and protamine 2 expression level among the study groups (p ≤ .001). Down-regulation has been found in the protamine 1 and protamine 2 expression levels in the oligospermia group compared to the proved fertile group with fold change (0.001 and 0.0002 respectively). In conclusion, this study proposes that the alteration in global DNA methylation may influence the protamine expression level and may be lead to abnormalities in human semen parameters.
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Affiliation(s)
- Mohammed Laqqan
- Obstetrics and Gynecology Department, Assisted Reproduction Unit, Faculty of Medicine, University of Saarland, Homburg, Germany
| | - Islam Ahmed
- Obstetrics and Gynecology Department, Assisted Reproduction Unit, Faculty of Medicine, University of Saarland, Homburg, Germany
| | - Mohammed Yasin
- Faculty of Medicine, 6th of October University, 6th of October City, Egypt
| | - Mohamad Eid Hammadeh
- Obstetrics and Gynecology Department, Assisted Reproduction Unit, Faculty of Medicine, University of Saarland, Homburg, Germany
| | - Maged Yassin
- Human Physiology Department, Faculty of Medicine, Al-Azhar University, Gaza Strip
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Bonde JPE, Tøttenborg SS, Hougaard KS. Paternal environmental exposure and offspring health. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.coemr.2019.05.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Cao W, Pan X, Ye F, Zhou J, Huang Z, Li C, Zhang Y, Fang J, Jiang Y, Lian H, Fu Z, Du Y, Wang L. Association between semen quality among men with different occupational exposures and risk of recurrent spontaneous abortion in island residents. TRADITIONAL MEDICINE AND MODERN MEDICINE 2019. [DOI: 10.1142/s257590001950006x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Objective: This study aimed to evaluate the semen quality of male adults whose spouses suffer from recurrent spontaneous abortion (RSA) in the island area, and to explore the association between RSA and occupational exposures. Methods: A total of 131 male patients were recruited and divided into two groups: spouse with recurrent spontaneous abortion group (RSA group, [Formula: see text]) and the normal fertility group (control group, [Formula: see text]). Information such as height, weight and occupational exposure history of 131 men were obtained. Semen samples were collected and analyzed. Differences in semen parameters and DNA fragmentation index (DFI) between the two groups were compared. Odds ratios (ORs) and their corresponding 95% confidence intervals were calculated to evaluate the association between occupational exposures and RSA status. Results: Overall, no significant difference was found in sperm concentration, progressive motility and normal morphology rate between RSA and control groups. Only DFI was observed to be significantly higher in the RSA group. Evaluation of the receiver operating characteristic (ROC) curve showed DFI (AUC: 0.623, [Formula: see text]) could discriminate between males from the couples with RSA and without RSA. Conclusion: The analysis of conventional semen parameters could not directly reflect their influence on embryonic development, and test of integrity of the sperm DNA is of paramount importance to fully understand male fertility. It is crucial to conduct studies regarding occupational exposures and pregnancy loss and/or RSA risk, since it will provide population-level data to aid in the identification of important risk factors that warrant further mechanistic investigation, and eventually lead to effective prevention and treatment strategies.
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Affiliation(s)
- Wenli Cao
- Reproductive Medicine Center of Zhoushan Maternal and Child Health Care Hospital, Zhoushan, Zhejiang, P. R. China
| | - Xinyao Pan
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai 200011, P. R. China
- The Academy of Integrative Medicine of Fudan University, Shanghai, P. R. China
- Shanghai Key Laboratory of Female Reproductive, Endocrine-Related Diseases, Shanghai, P. R. China
| | - Feijun Ye
- Reproductive Medicine Center of Zhoushan Maternal and Child Health Care Hospital, Zhoushan, Zhejiang, P. R. China
| | - Jing Zhou
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai 200011, P. R. China
- The Academy of Integrative Medicine of Fudan University, Shanghai, P. R. China
- Shanghai Key Laboratory of Female Reproductive, Endocrine-Related Diseases, Shanghai, P. R. China
| | - Zengshu Huang
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai 200011, P. R. China
- The Academy of Integrative Medicine of Fudan University, Shanghai, P. R. China
- Shanghai Key Laboratory of Female Reproductive, Endocrine-Related Diseases, Shanghai, P. R. China
| | - Chuyu Li
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai 200011, P. R. China
- The Academy of Integrative Medicine of Fudan University, Shanghai, P. R. China
- Shanghai Key Laboratory of Female Reproductive, Endocrine-Related Diseases, Shanghai, P. R. China
| | - Yanpu Zhang
- Reproductive Medicine Center of Zhoushan Maternal and Child Health Care Hospital, Zhoushan, Zhejiang, P. R. China
| | - Jianwei Fang
- Reproductive Medicine Center of Zhoushan Maternal and Child Health Care Hospital, Zhoushan, Zhejiang, P. R. China
| | - Yan Jiang
- Reproductive Medicine Center of Zhoushan Maternal and Child Health Care Hospital, Zhoushan, Zhejiang, P. R. China
| | - Hongyu Lian
- Reproductive Medicine Center of Zhoushan Maternal and Child Health Care Hospital, Zhoushan, Zhejiang, P. R. China
| | - Zhongxing Fu
- Ningguo Bio-Leader Biotechnology Co., Ltd., Anhui, P. R. China
| | - Yan Du
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai 200011, P. R. China
- The Academy of Integrative Medicine of Fudan University, Shanghai, P. R. China
| | - Ling Wang
- Laboratory for Reproductive Immunology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai 200011, P. R. China
- The Academy of Integrative Medicine of Fudan University, Shanghai, P. R. China
- Shanghai Key Laboratory of Female Reproductive, Endocrine-Related Diseases, Shanghai, P. R. China
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Rahiminia T, Farashahi Yazd E, Ghasemi-Esmailabad S, Talebi AR. Relation between sperm protamine transcripts with global sperm DNA methylation and sperm DNA methyltransferases mRNA in men with severe sperm abnormalities. HUM FERTIL 2019; 24:105-111. [PMID: 31023108 DOI: 10.1080/14647273.2019.1574032] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This study aimed to evaluate the relationship between mRNA expression of DNA methyltransferases (DNMTs) such as DNMT1, DNMT3A and DNMT3B mRNA and sperm global DNA methylation with protamine transcripts in the sperm from men with severe sperm abnormalities. Sperm from each semen sample were isolated using a standard gradient isolation procedure by layering 1 mL of 40% (v/v) density gradient medium over 1 mL of 80% (v/v). A total of 30 oligoasthenoteratozoospermic ejaculates (OAT) and 30 normozoospermic ejaculates as controls were compared using real-time quantitative reverse transcriptase polymerase chain reaction for mRNA expression of DNMT1, 3A, 3B, protamine1 (P1) and protamine2 (P2). The enzyme-linked immunosorbent assay was used to detect global DNA methylation in sperm. A p-value of <0.05 was considered statistically significant. In OAT ejaculates, the increased level of DNMT3A, 3B mRNA, sperm global methylation, P1 plus P2 mRNA and decrease of P1-P2 ratio were significantly different. Also the content of protamine transcript was not correlated with sperm parameters. The increased total protamine transcript levels were associated with increased mRNA methyltransferases. The increase of DNMT1 may lead to an increased level of global methylation.
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Affiliation(s)
- Tahereh Rahiminia
- Gametogenesis Research Center, Fertility and Infertility Center, Kashan University of Medical Sciences, Kashan, Iran
| | - Ehsan Farashahi Yazd
- Stem Cell Biology Research Center Research and Clinical Center for Infertility, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Saeed Ghasemi-Esmailabad
- Research and Clinical Center for Infertility, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Ali Reza Talebi
- Research and Clinical Center for Infertility, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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8
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Modulation of LDL receptor expression and promoter methylation in HepG2 cells treated with a Corylus avellana L. extract. J Funct Foods 2019. [DOI: 10.1016/j.jff.2018.12.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Benassi B, Santangeli S, Merla C, Tarantini L, Bollati V, Butera A, Marino C, Consales C. 50-Hz MF does not affect global DNA methylation of SH-SY5Y cells treated with the neurotoxin MPP . Bioelectromagnetics 2018; 40:33-41. [PMID: 30537234 DOI: 10.1002/bem.22158] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 10/23/2018] [Indexed: 01/08/2023]
Abstract
Exposure to extremely low frequency magnetic fields (ELF-MFs) has been associated with an increased risk of neurodegenerative disorders. The underlying mechanisms, however, are still debated. Since epigenetics play a key role in the neurodegenerative process, we investigated whether exposure to ELF-MF (50 Hz, 1 mT) might affect global DNA methylation of SH-SY5Y dopaminergic-like neuroblastoma cells. We assessed the percentage of 5-methylcytosine (5-mC) of three repetitive interspersed sequences (ALU, LINE-1, or SATα), through pyrosequencing analysis. We demonstrated that ELF exposure (up to 72 h) does not induce any change in the methylation pattern of ALU, LINE-1, and SATα in both proliferating and differentiated SH-SY5Y cells. Furthermore, when administered in combination with 1-methyl-4-phenylpyridinium (MPP+ ), a neurotoxin mimicking the Parkinson's Disease (PD) phenotype, ELF-MF exposure does not trigger any modulation in the percentage of 5-mC of the repetitive elements. Our findings demonstrate that exposure to 50-Hz MF does not affect global DNA methylation in proliferating and dopaminergic differentiated SH-SY5Y cells, either under basal culture conditions or under neurotoxic stress. Bioelectromagnetics. 40:33-41, 2019. © 2018 Bioelectromagnetics Society.
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Affiliation(s)
- Barbara Benassi
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Rome, Italy
| | - Stefania Santangeli
- Department of Life and Environmental Sciences, "Marche Polytechnic" University, Ancona, Italy
| | - Caterina Merla
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Rome, Italy
| | - Letizia Tarantini
- EPIGET-Epidemiology, Epigenetics and Toxicology Lab, Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Valentina Bollati
- EPIGET-Epidemiology, Epigenetics and Toxicology Lab, Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Alessio Butera
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Rome, Italy.,Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | - Carmela Marino
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Rome, Italy
| | - Claudia Consales
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Rome, Italy
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10
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Hamad MF, Dayyih WAA, Laqqan M, AlKhaled Y, Montenarh M, Hammadeh ME. The status of global DNA methylation in the spermatozoa of smokers and non-smokers. Reprod Biomed Online 2018; 37:581-589. [PMID: 30366840 DOI: 10.1016/j.rbmo.2018.08.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 08/28/2018] [Accepted: 08/29/2018] [Indexed: 01/06/2023]
Abstract
RESEARCH QUESTION Does regular smoking affect semen quality and the levels of DNA methylation in mature human spermatozoa? DESIGN Spermatozoa from 109 men were evaluated (55 smokers and 54 non-smokers). DNA was extracted from purified spermatozoa, and DNA methylation was quantified by enzyme-linked immunosorbent assay (ELISA). RESULTS Global DNA methylation of non-smokers is significantly lower (P < 0.001) than that of smokers (4.85 ± 2.72 and 7.08 ± 1.77 ng/μl, respectively). Moreover, the mean global DNA methylation levels were significantly correlated (r = 0.22;P = 0.02) with non-condensed chromatin in the spermatozoa. Levels of non-condensed chromatin were significantly higher (P < 0.001) in smokers (29.75 ± 9.38%) compared with non-smokers (20.96 ± 11.31%). Furthermore, global sperm DNA methylation was negatively correlated with high significance (P < 0.010) with sperm: count (r = -0.27), motility (r = -0.30) and vitality (r = -0.26). CONCLUSION Smoking interferes with DNA methylation. Also, DNA methylation is significantly correlated with sperm parameters and sperm non-condensed chromatin. These data emphasize another detrimental effect of smoking on male fertility. DNA methylation may, therefore, be considered as a fertility marker in men.
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Affiliation(s)
- Mohammed F Hamad
- Department of Basic Sciences, College of Science and Health Professions, King Saud Bin Abdulaziz University for Health Sciences, Jeddah, Saudi Arabia; IVF and Andrology Laboratory, Department of Obstetrics and Gynaecology, Saarland University Hospital, Building 9, Homburg/Saar 66424, Germany; Department of Medical Biochemistry and Molecular Biology, Saarland University, Building 44, 66424, Homburg/Saar, Germany.
| | - Wael A Abu Dayyih
- Department of Pharmaceutical Medicinal Chemistry and Pharmacognosy, Faculty of Pharmacy and Medical Sciences, University of Petra, Amman, Jordan
| | - Mohammad Laqqan
- IVF and Andrology Laboratory, Department of Obstetrics and Gynaecology, Saarland University Hospital, Building 9, Homburg/Saar 66424, Germany
| | - Yasir AlKhaled
- IVF and Andrology Laboratory, Department of Obstetrics and Gynaecology, Saarland University Hospital, Building 9, Homburg/Saar 66424, Germany
| | - Mathias Montenarh
- Department of Medical Biochemistry and Molecular Biology, Saarland University, Building 44, 66424, Homburg/Saar, Germany
| | - Mohammed E Hammadeh
- IVF and Andrology Laboratory, Department of Obstetrics and Gynaecology, Saarland University Hospital, Building 9, Homburg/Saar 66424, Germany
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Houfflyn S, Matthys C, Soubry A. Male Obesity: Epigenetic Origin and Effects in Sperm and Offspring. CURRENT MOLECULAR BIOLOGY REPORTS 2017; 3:288-296. [PMID: 29387521 PMCID: PMC5768668 DOI: 10.1007/s40610-017-0083-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
PURPOSE OF REVIEW The prevalence of obesity has increased substantially in the current generations of Western countries, and the burden of obesity-related complications has been growing steadily. In men, obesity is not only a major risk factor for serious chronic diseases, concern is growing that the reproductive capacity, and more particularly, their offspring's health may be affected. Obesity-related impaired spermatogenesis is associated with a decrease in microscopic and molecular sperm characteristics and pregnancy success. We hypothesize that epigenetics is an important mediator explaining interactions between an obesogenic environment and sperm/offspring outcomes. RECENT FINDINGS Recent studies have explored inter- and transgenerational epigenetic effects in sperm cells and in offspring. Father-to-child effects have been reported in relation to preconceptional nutritional and life-style related factors. SUMMARY Here, we summarize the current understanding about obesity and molecular or epigenetic underlying mechanisms in sperm. We identify the obesogenic environment of the father before conception as a potential origin of health or disease in the offspring and include it as part of a new concept, the Paternal Origins of Health and Disease (POHaD).
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Affiliation(s)
- Sam Houfflyn
- Epidemiology Research Unit, Department of Public Health and Primary Care, University of Leuven, 3000 Leuven, Belgium
| | - Christophe Matthys
- Clinical and Experimental Endocrinology, Department of Chronic Diseases, Metabolism, and Ageing, KU Leuven University, Leuven, Belgium
| | - Adelheid Soubry
- Epidemiology Research Unit, Department of Public Health and Primary Care, University of Leuven, 3000 Leuven, Belgium
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12
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Consales C, Cirotti C, Filomeni G, Panatta M, Butera A, Merla C, Lopresto V, Pinto R, Marino C, Benassi B. Fifty-Hertz Magnetic Field Affects the Epigenetic Modulation of the miR-34b/c in Neuronal Cells. Mol Neurobiol 2017; 55:5698-5714. [PMID: 29039021 DOI: 10.1007/s12035-017-0791-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 09/26/2017] [Indexed: 12/24/2022]
Abstract
The exposure to extremely low-frequency magnetic fields (ELF-MFs) has been associated to increased risk of neurodegenerative diseases, although the underlying molecular mechanisms are still undefined. Since epigenetic modulation has been recently encountered among the key events leading to neuronal degeneration, we here aimed at assessing if the control of gene expression mediated by miRNAs, namely miRs-34, has any roles in driving neuronal cell response to 50-Hz (1 mT) magnetic field in vitro. We demonstrate that ELF-MFs drive an early reduction of the expression level of miR-34b and miR-34c in SH-SY5Y human neuroblastoma cells, as well as in mouse primary cortical neurons, by affecting the transcription of the common pri-miR-34. This modulation is not p53 dependent, but attributable to the hyper-methylation of the CpG island mapping within the miR-34b/c promoter. Incubation with N-acetyl-l-cysteine or glutathione ethyl-ester fails to restore miR-34b/c expression, suggesting that miRs-34 are not responsive to ELF-MF-induced oxidative stress. By contrast, we show that miRs-34 control reactive oxygen species production and affect mitochondrial oxidative stress triggered by ELF-MFs, likely by modulating mitochondria-related miR-34 targets identified by in silico analysis. We finally demonstrate that ELF-MFs alter the expression of the α-synuclein, which is specifically stimulated upon ELF-MFs exposure via both direct miR-34 targeting and oxidative stress. Altogether, our data highlight the potential of the ELF-MFs to tune redox homeostasis and epigenetic control of gene expression in vitro and shed light on the possible mechanism(s) producing detrimental effects and predisposing neurons to degeneration.
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Affiliation(s)
- Claudia Consales
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA-Casaccia, Via Anguillarese 301, 00123, Rome, Italy.
| | - Claudia Cirotti
- Department of Biology, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Giuseppe Filomeni
- Department of Biology, University of Rome Tor Vergata, 00133, Rome, Italy.,Cell Stress and Survival Unit, Center for Autophagy, Recycling and Disease (CARD), Danish Cancer Society Research Center, 2100, Copenhagen, Denmark
| | - Martina Panatta
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA-Casaccia, Via Anguillarese 301, 00123, Rome, Italy
| | - Alessio Butera
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA-Casaccia, Via Anguillarese 301, 00123, Rome, Italy
| | - Caterina Merla
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA-Casaccia, Via Anguillarese 301, 00123, Rome, Italy.,Vectorology and Anticancer Therapies, UMR 8203, CNRS, Gustave Roussy, Univ. Paris-Sud, Université Paris-Saclay, 94805, Villejuif, France
| | - Vanni Lopresto
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA-Casaccia, Via Anguillarese 301, 00123, Rome, Italy
| | - Rosanna Pinto
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA-Casaccia, Via Anguillarese 301, 00123, Rome, Italy
| | - Carmela Marino
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA-Casaccia, Via Anguillarese 301, 00123, Rome, Italy
| | - Barbara Benassi
- Division of Health Protection Technologies, ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA-Casaccia, Via Anguillarese 301, 00123, Rome, Italy.
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13
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Wu H, Hauser R, Krawetz SA, Pilsner JR. Environmental Susceptibility of the Sperm Epigenome During Windows of Male Germ Cell Development. Curr Environ Health Rep 2016; 2:356-66. [PMID: 26362467 PMCID: PMC4623071 DOI: 10.1007/s40572-015-0067-7] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Male germ cells require multiple epigenetic reprogramming events during their lifespan to achieve reproductive capacity. An emerging body of compelling data demonstrates that environmental exposures can be embodied within the developing male germ cell as epigenetic marks. In turn, these epigenetic marks can impart information at fertilization to affect the trajectory of offspring health and development. While it is recognized that in utero epigenetic reprogramming of male germ cells is a particularly susceptible window to environmental exposures, other such windows exist during germ cell development. The objective of this review is to discuss epigenetic reprogramming events during male germ cell development and to provide supporting evidence from animal and human studies that during specific periods of development, germ cells are susceptible to environmentally induced epigenetic errors. Moving forward, the nascent field of sperm epigenetics research is likely to advance our understanding of paternal environmental determinants of offspring health and development.
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Affiliation(s)
- Haotian Wu
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts Amherst, 149 Goessmann, 686 North Pleasant Street, Amherst, MA, 01003, USA.
| | - Russ Hauser
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Harvard University, Building I 14th Floor, 665 Huntington Avenue, Boston, MA, 02115, USA.
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Harvard University, Building I 14th Floor, 665 Huntington Avenue, Boston, MA, 02115, USA.
| | - Stephen A Krawetz
- Department of Obstetrics and Gynecology, C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, 275 East. Hancock, Detroit, MI, 48201, USA.
| | - J Richard Pilsner
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts Amherst, 149 Goessmann, 686 North Pleasant Street, Amherst, MA, 01003, USA.
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14
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Consales C, Toft G, Leter G, Bonde JPE, Uccelli R, Pacchierotti F, Eleuteri P, Jönsson BAG, Giwercman A, Pedersen HS, Struciński P, Góralczyk K, Zviezdai V, Spanò M. Exposure to persistent organic pollutants and sperm DNA methylation changes in Arctic and European populations. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2016; 57:200-9. [PMID: 26801515 DOI: 10.1002/em.21994] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 12/06/2015] [Indexed: 05/28/2023]
Abstract
Persistent organic pollutants (POPs), such as PCBs (polychlorinated biphenyls) and DDT [1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane], are environmental contaminants with potential endocrine disrupting activity. DNA methylation levels in peripheral blood lymphocytes have been associated with serum concentrations of POPs in Greenland Inuit and Korean populations. Greenland Inuits are characterized by the highest worldwide POP levels. In this cross-sectional study we evaluated the relationship between serum POP concentrations and DNA methylation levels in sperm of non-occupationally exposed fertile men from Greenland, Warsaw (Poland), and Kharkiv (Ukraine). Serum levels of PCB-153 [1,2,4-trichloro-5-(2,4,5-trichlorophenyl)benzene], as a proxy of the total PCBs body burden, and of p,p'-DDE [1,1-dichloro-2,2-bis(4-chlorophenyl)ethylene], the main metabolite of DDT were measured. Sperm DNA methylation level was assessed globally by flow cytometric (FCM) immunodetection of 5-methyl-cytosines and at specific repetitive DNA sequences (Alu, LINE-1, Satα) by PCR-pyrosequencing after bisulfite conversion. Multivariate linear regression analysis was applied to investigate correlations between serum POP concentrations and DNA methylation. No consistent associations between exposure to POPs and sperm DNA methylation at repetitive DNA sequences were detected. A statistically significant global decrease in methylation was associated with exposure to either POP by FCM analysis. This is the first study to investigate environmental exposure to POPs and DNA methylation levels considering sperm as the target cells. Although POP exposure appears to have a limited negative impact on sperm DNA methylation levels in adult males, the global hypomethylation detected by one of the methods applied suggests that further investigation is warranted.
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Affiliation(s)
- Claudia Consales
- Laboratory of Biosafety and Risk Assessment, Division of Health Technologies, Department of Sustainable Territorial and Production Systems, ENEA Casaccia Research Center, Rome, 00123, Italy
| | - Gunnar Toft
- Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus N, DK-8200, Denmark
| | - Giorgio Leter
- Laboratory of Biosafety and Risk Assessment, Division of Health Technologies, Department of Sustainable Territorial and Production Systems, ENEA Casaccia Research Center, Rome, 00123, Italy
| | - Jens Peter E Bonde
- Department of Occupational and Environmental Medicine, Bispebjerg University Hospital of Copenhagen, Copenhagen, NV, DK-2400, Denmark
| | - Raffaella Uccelli
- Laboratory of Biosafety and Risk Assessment, Division of Health Technologies, Department of Sustainable Territorial and Production Systems, ENEA Casaccia Research Center, Rome, 00123, Italy
| | - Francesca Pacchierotti
- Laboratory of Biosafety and Risk Assessment, Division of Health Technologies, Department of Sustainable Territorial and Production Systems, ENEA Casaccia Research Center, Rome, 00123, Italy
| | - Patrizia Eleuteri
- Laboratory of Biosafety and Risk Assessment, Division of Health Technologies, Department of Sustainable Territorial and Production Systems, ENEA Casaccia Research Center, Rome, 00123, Italy
| | - Bo A G Jönsson
- Division of Occupational and Environmental Medicine, Department of Laboratory Medicine, Lund University, Lund, SE-22185, Sweden
| | - Aleksander Giwercman
- Molecular Reproductive Medicine, Department of Translational Medicine, Skåne University Hospital Malmö, Lund University, Malmö, SE-20502, Sweden
| | - Henning S Pedersen
- Centre for Arctic Environmental Medicine, Greenland Institute of Natural Resources, Nuuk, Greenland, DK-3900, Denmark
| | - Paweł Struciński
- Department of Toxicology and Risk Assessment, National Institute of Public Health-National Institute of Hygiene, Warsaw, 00791, Poland
| | - Katarzyna Góralczyk
- Department of Toxicology and Risk Assessment, National Institute of Public Health-National Institute of Hygiene, Warsaw, 00791, Poland
| | - Valentyna Zviezdai
- Laboratory of Human Reproduction, Department of Social Medicine and Organization of Public Health, Kharkiv National Medical University, Kharkiv, 61022, Ukraine
| | - Marcello Spanò
- Laboratory of Biosafety and Risk Assessment, Division of Health Technologies, Department of Sustainable Territorial and Production Systems, ENEA Casaccia Research Center, Rome, 00123, Italy
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15
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Environmental Impact on DNA Methylation in the Germline: State of the Art and Gaps of Knowledge. BIOMED RESEARCH INTERNATIONAL 2015; 2015:123484. [PMID: 26339587 PMCID: PMC4538313 DOI: 10.1155/2015/123484] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Accepted: 05/03/2015] [Indexed: 12/19/2022]
Abstract
The epigenome consists of chemical changes in DNA and chromatin that without modifying the DNA sequence modulate gene expression and cellular phenotype. The epigenome is highly plastic and reacts to changing external conditions with modifications that can be inherited to daughter cells and across generations. Whereas this innate plasticity allows for adaptation to a changing environment, it also implies the potential of epigenetic derailment leading to so-called epimutations. DNA methylation is the most studied epigenetic mark. DNA methylation changes have been associated with cancer, infertility, cardiovascular, respiratory, metabolic, immunologic, and neurodegenerative pathologies. Experiments in rodents demonstrate that exposure to a variety of chemical stressors, occurring during the prenatal or the adult life, may induce DNA methylation changes in germ cells, which may be transmitted across generations with phenotypic consequences. An increasing number of human biomonitoring studies show environmentally related DNA methylation changes mainly in blood leukocytes, whereas very few data have been so far collected on possible epigenetic changes induced in the germline, even by the analysis of easily accessible sperm. In this paper, we review the state of the art on factors impinging on DNA methylation in the germline, highlight gaps of knowledge, and propose priorities for future studies.
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16
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Montjean D, Zini A, Ravel C, Belloc S, Dalleac A, Copin H, Boyer P, McElreavey K, Benkhalifa M. Sperm global DNA methylation level: association with semen parameters and genome integrity. Andrology 2015; 3:235-40. [PMID: 25755112 DOI: 10.1111/andr.12001] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2014] [Revised: 11/21/2014] [Accepted: 11/26/2014] [Indexed: 12/26/2022]
Abstract
Sperm DNA methylation abnormalities have been detected in oligozoospermic men. However, the association between sperm DNA methylation defects, sperm parameters and sperm DNA, and chromatin integrity remains poorly understood. This study was designed to clarify this issue. We recruited a cohort of 92 men (62 normozoospermic and 30 oligoasthenozoospermic) presenting for infertility evaluation during a 1-year period. Sperm global DNA methylation was evaluated by an ELISA-like method, DNA fragmentation was evaluated by flow cytometry-based terminal transferase dUTP nick end-labeling (TUNEL) assay (reported as DNA fragmentation index or DFI), and sperm denaturation was evaluated by aniline blue staining (reported as sperm denaturation index or SDI, a marker of chromatin compaction). We found a significant positive association between sperm global DNA methylation level and conventional sperm parameters (sperm concentration and motility), supported by the results of methylation analysis on H19-DMR. We also identified significant inverse relationships between sperm global DNA methylation, and, both DFI and SDI. However, sperm global DNA methylation level was not related to sperm vitality or morphology. Our findings suggest that global sperm DNA methylation levels are related to conventional sperm parameters, as well as, sperm chromatin and DNA integrity.
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Affiliation(s)
- D Montjean
- Service de Medicine et Biologie de la Reproduction, Hopital Saint-Joseph, Marseille, France
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