1
|
Boulicault M, Perret M, Galka J, Borsa A, Gompers A, Reiches M, Richardson S. The future of sperm: a biovariability framework for understanding global sperm count trends. HUM FERTIL 2022; 25:888-902. [PMID: 33969777 DOI: 10.1080/14647273.2021.1917778] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The past 50 years have seen heated debate in the reproductive sciences about global trends in human sperm count. In 2017, Levine and colleagues published the largest and most methodologically rigorous meta-regression analysis to date and reported that average total sperm concentration among men from 'Western' countries has decreased by 59.3% since 1973, with no sign of halting. These results reverberated in the scientific community and in public discussions about men and masculinity in the modern world, in part because of scientists' public-facing claims about the societal implications of the decline of male fertility. We find that existing research follows a set of implicit and explicit assumptions about how to measure and interpret sperm counts, which collectively form what we term the Sperm Count Decline hypothesis (SCD). Using the study by Levine and colleagues, we identify weaknesses and inconsistencies in the SCD, and propose an alternative framework to guide research on sperm count trends: the Sperm Count Biovariability hypothesis (SCB). SCB asserts that sperm count varies within a wide range, much of which can be considered non-pathological and species-typical. Knowledge about the relationship between individual and population sperm count and life-historical and ecological factors is critical to interpreting trends in average sperm counts and their relationships to health and fertility.
Collapse
Affiliation(s)
- Marion Boulicault
- Department of Philosophy and Linguistics, Massachusetts Institute of Technology, Cambridge, MA, USA.,Department of Philosophy, University of Adelaide, Adelaide, Australia
| | - Meg Perret
- Department of the History of Science, Harvard University, Cambridge, MA, USA
| | - Jonathan Galka
- Department of the History of Science, Harvard University, Cambridge, MA, USA
| | - Alex Borsa
- Department of Sociomedical Sciences, Columbia University, New York, NY, USA
| | - Annika Gompers
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Meredith Reiches
- Department of Anthropology, University of Massachusetts, Boston, MA, USA
| | - Sarah Richardson
- Department of the History of Science, Harvard University, Cambridge, MA, USA.,Committee on Degrees in Studies of Women, Gender, and Sexuality, Harvard University, Cambridge, MA, USA
| |
Collapse
|
2
|
Feferkorn I, Azani L, Kadour-Peero E, Hizkiyahu R, Shrem G, Salmon-Divon M, Dahan MH. Geographic variation in semen parameters from data used for the World Health Organization semen analysis reference ranges. Fertil Steril 2022; 118:475-482. [PMID: 35750517 DOI: 10.1016/j.fertnstert.2022.05.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/25/2022] [Accepted: 05/26/2022] [Indexed: 01/13/2023]
Abstract
OBJECTIVE To study geographic variations in sperm parameters using data from the trials that defined the reference ranges of the World Health Organization 2021 manual. DESIGN Retrospective evaluation of the data used to define the World Health Organization reference ranges. SETTING Not applicable. PATIENT(S) Data from 11 studies, including 3,484 participants across 5 continents. INTERVENTION(S) The data were divided according to geographic locations. MAIN OUTCOME MEASURE(S) Differences in sperm parameters. RESULT(S) The semen volume was significantly lower in samples from Asia and Africa than in other regions. The sperm concentration was the lowest in Africa and highest in Australia. The total motile sperm count (TMSC) and total motile progressive sperm count (TMPS) were significantly lower in Africa than in other regions. The TMSC and TMPS in Asia and the United States were significantly lower than in Europe and Australia. The 5th percentile of the sperm concentration was lowest in the United States (12.5 × 106/mL). The 5th percentile for the normal sperm morphology was lowest in the United States (3%) and highest in Asia (5%). The 5th percentile for the TMSC and TMPS were lowest in Africa (TMSC, 15.08 million; TMPS, 12.06 million) and the United States (TMSC, 18.05 million; TMPS, 16.86 million) and highest in Australia (TMSC, 29.61 million; TMPS, 25.80 million). CONCLUSION(S) Significant geographic differences in sperm parameters exist, and regional fertility societies should consider adding their own reference ranges on the basis of local experience and treatment outcomes.
Collapse
Affiliation(s)
- Ido Feferkorn
- Division of Reproductive Endocrinology and Infertility, McGill University Health Care Center, Québec, Canada.
| | - Liat Azani
- Department of Molecular Biology, Ariel University, Ariel, Israel
| | - Einav Kadour-Peero
- Division of Reproductive Endocrinology and Infertility, McGill University Health Care Center, Québec, Canada
| | - Ranit Hizkiyahu
- Division of Reproductive Endocrinology and Infertility, McGill University Health Care Center, Québec, Canada
| | - Guy Shrem
- IVF Unit, Department of Obstetrics and Gynecology, Kaplan Medical Center, Rehovot, Israel
| | - Mali Salmon-Divon
- Department of Molecular Biology, Ariel University, Ariel, Israel; Adelson School of Medicine, Ariel University, Ariel, Israel
| | - Michael H Dahan
- Division of Reproductive Endocrinology and Infertility, McGill University Health Care Center, Québec, Canada
| |
Collapse
|
3
|
Auger J, Eustache F, Chevrier C, Jégou B. Spatiotemporal trends in human semen quality. Nat Rev Urol 2022; 19:597-626. [PMID: 35978007 PMCID: PMC9383660 DOI: 10.1038/s41585-022-00626-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/06/2022] [Indexed: 11/09/2022]
Abstract
Over the past four decades, studies of various designs have reported spatial and temporal trends in human semen quality. Several standardized-methodology studies in homogeneous populations that compare specific cities within a country or a continent provide clear evidence of geographical differences in sperm production, even over short distances within the same country. Human sperm production is widely believed to be declining over time, but evidence from the scientific literature is less clear. Studies based on repeated cross-sectional data from a single centre have shown mixed results. Among the numerous retrospective studies conducted in a single centre, only some included homogeneous groups of men and appropriate methods, and most of them suggest a temporal decrease in human sperm production in the geographical areas considered. Conclusions reporting temporal trends in sperm production that came from existing retrospective multicentre studies based on individual semen data and those using means, medians or estimates of sperm production are questionable, owing to intrinsic limitations in the studies performed. Regardless of study design, studies on the percentage of motile or morphologically normal spermatozoa are still limited by the inherent variability in assessment. Overall, available data do not enable us to conclude that human semen quality is deteriorating worldwide or in the Western world, but that a trend is observed in some specific areas. To understand these trends and contrasts in sperm and semen quality, prospective studies should be encouraged and combined with assessment of the male exposome. Several studies over the past few decades have suggested that sperm quality varies by geographical region and might be subject to a temporal decline worldwide. However, the data supporting these conclusions have come from studies of various methodologies and heterogeneous populations, making them unreliable. In this in-depth Review, Chevrier and colleagues discuss the data surrounding discussion of spatiotemporal trends in semen parameters and consider how these trends and the factors promoting them interact. The vast literature on human semen quality trends is extremely heterogeneous in terms of the populations studied and study designs, and so these studies have been unable to draw firm conclusions. Understanding the data around spatiotemporal semen trends requires a focus on the methodological choices and application of criteria to filter findings from the studies with optimal design. Numerous appropriately designed studies suggest unambiguous geographical contrasts in human sperm production; however, evidence of a decline in sperm production is reliable only in specific populations and cities in which studies with a complete set of quality criteria have been conducted. By contrast, suggestions of a worldwide drop in human semen quality on the basis of retrospective multicentre studies cannot be substantiated, owing to intrinsic limitations in the studies performed. Many and varied factors of variation, in particular the diverse modalities of assessment, do not enable us to conclude that clear temporal trends of sperm motility and normal morphology are present. Progress in our understanding of the highlighted trends and their causal factors requires prospective studies that minimize all known biases combined with the assessment of men’s exposome.
Collapse
Affiliation(s)
- Jacques Auger
- INSERM U1016-Equipe "Génomique, Epigénétique et Physiologie de la Reproduction", Institut Cochin, Université Paris Descartes-Paris, Paris, France
| | - Florence Eustache
- INSERM U1016-Equipe "Génomique, Epigénétique et Physiologie de la Reproduction", Institut Cochin, Université Paris Descartes-Paris, Paris, France.,CECOS, Hôpitaux Universitaires Paris Seine-Saint-Denis, Hôpital Jean Verdier and Service de Biologie de la Reproduction, Hôpitaux Universitaires Paris Nord Val de Seine, Hôpital Bichat, Paris, France
| | - Cécile Chevrier
- Université Rennes, INSERM, EHESP, IRSET-UMR_S 1085, Rennes, France.
| | - Bernard Jégou
- Université Rennes, INSERM, EHESP, IRSET-UMR_S 1085, Rennes, France
| |
Collapse
|
4
|
Paffoni A, Somigliana E, Boeri L, Viganò P. The statistical foundation of the reference population for semen analysis included in the sixth edition of the WHO manual: a critical reappraisal of the evidence. Hum Reprod 2022; 37:2237-2245. [PMID: 35849333 PMCID: PMC9527466 DOI: 10.1093/humrep/deac161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 06/28/2022] [Indexed: 11/28/2022] Open
Abstract
In the most recent version of the ‘WHO Laboratory Manual For The Examination And Processing Of Human Semen’, the updated target population used to infer reference values included 3589 fertile subjects, representative of 12 countries and 5 continents, and 10 studies. We have critically evaluated the newly proposed distribution of semen examination results using an approach borrowed from clinical chemistry laboratories and based on the recommendations of the International Federation of Clinical Chemistry for estimation of reference intervals. Surprisingly, most prerequisites to produce common reference intervals through multicentric data were not met. Moreover, when we assessed with the bootstrap method the descriptive reference values obtained from raw data of the 10 individual studies for sperm concentration, sperm number, motility and normal forms, we found that none of the populations was completely correctly described by the reference centiles. We concluded that aggregated data used to build the reference distribution cannot be considered to originate from the same population, and this can result from real differences among individuals or different methodological approaches used in the various studies. Transferability conditions across studies did not seem to have been met. Our findings strengthen the relevance of concerns regarding the use of reference populations in the World Health Organization manual to discriminate between fertile and infertile men.
Collapse
Affiliation(s)
| | - Edgardo Somigliana
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Infertility Unit, Milan, Italy.,Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
| | - Luca Boeri
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Department of Urology, Milan, Italy
| | - Paola Viganò
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Infertility Unit, Milan, Italy
| |
Collapse
|
5
|
Li Y, Sun C, Ma H, Zhu H, Zhang F, Jiang F. Basic Phenotyping of Male Fertility from 2019 to 2020 at the Human Sperm Bank of Fudan University. PHENOMICS (CHAM, SWITZERLAND) 2022; 2:211-218. [PMID: 36939761 PMCID: PMC9590568 DOI: 10.1007/s43657-022-00047-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 01/18/2022] [Accepted: 01/22/2022] [Indexed: 11/25/2022]
Abstract
The aim of this cross-sectional survey was to analyze the semen parameters of volunteers from the Human Sperm Bank of Fudan University, as well as the related factors influencing these parameters. From January 2019 to December 2020, semen parameters from a total of 5214 men were included in this survey. The Kruskal-Wallis test was used to detect differences associated with several independent variables. A total of 5214 volunteers were included. The volunteers were registered in 33 provinces, autonomous regions, municipalities (including Macau and Taiwan) and 294 prefecture-level cities. The average age of volunteers was 27.40 years. Overall, 76.50% of the volunteers had a college education or higher. Volunteers with BMI values of 18.5-23.9 kg/m2 accounted for 60.70% of participants. Semen parameters were significantly different according to season, education level, duration of abstinence, age group and BMI. The basic male fertility phenotypes (semen parameters) showed new trends in the study period, and accurate long-term tracking of male semen parameters will help researchers to better understand the changes in male fertility phenotypes (semen).
Collapse
Affiliation(s)
- Yadong Li
- Human Sperm Bank of Fudan University, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, 200011 China
| | - Can Sun
- Human Sperm Bank of Fudan University, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, 200011 China
| | - Haitao Ma
- Human Sperm Bank of Fudan University, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, 200011 China
| | - Hong Zhu
- Human Sperm Bank of Fudan University, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, 200011 China
| | - Feng Zhang
- Obstetrics and Gynecology Hospital of Fudan University, NHC Key Laboratory of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, State Key Laboratory of Genetic Engineering at School of Life Sciences, Fudan University, Shanghai, 200011 China
| | - Feng Jiang
- Human Sperm Bank of Fudan University, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, 200011 China
- Shanghai Ji Ai Genetics and IVF Institute, Obstetrics and Gynecology Hospital of Fudan University, Fudan University, Shanghai, 200011 China
| |
Collapse
|
6
|
Evolution of the World Health Organization semen analysis manual: where are we? Nat Rev Urol 2022; 19:439-446. [PMID: 35523961 DOI: 10.1038/s41585-022-00593-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/31/2022] [Indexed: 12/13/2022]
Abstract
The WHO (World Health Organization) manuals provide state-of-the-art guidance on how a semen analysis should be carried out. The much anticipated sixth edition of the WHO semen analysis manual has been released 10 years after its previous version and includes essential updates, such as new reference standards for semen volume and microscopic sperm characteristics of recent fathers. A well-conducted semen analysis remains an essential foundation of the infertility evaluation process and affects patient referral, diagnosis and treatment. However, a male infertility work-up primarily based on routine semen analysis does not provide men with an optimal fertility pathway; the primary reasons for routine semen analysis inadequacy in this context include its low predictive value for natural and assisted conception success, its inability to detect sperm DNA and epigenetic deficiencies that might negatively affect embryo development, implantation and offspring well-being, and the substantial overlap between semen parameters of fertile and subfertile individuals. Ideally, a full andrological assessment should be carried out by reproductive urologists in all men dealing with couple infertility and should include a detailed history analysis, physical examination, semen analysis, endocrine assessment and other tests as needed. Only through a complete male infertility work-up will relevant underlying medical and infertility conditions be revealed and potentially treated or alleviated. The ultimate goals of a comprehensive andrological assessment are to positively influence overall male health, pregnancy prospects and offspring well-being.
Collapse
|
7
|
Feferkorn I, Azani L, Kadour-Peero E, Hizkiyahu R, Shrem G, Salmon-Divon M, Dahan MH. An evaluation of changes over time in the semen parameters data used for the World Health Organization semen analysis reference ranges. Andrology 2021; 10:660-668. [PMID: 34964554 DOI: 10.1111/andr.13150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 12/20/2021] [Accepted: 12/20/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Previous meta-analyses concluded that there is a decline in sperm parameters over time. This conclusion might be incorrect due to inherent biases or focusing only on a single parameter - sperm concentration. OBJECTIVE To study trends in sperm parameters over the past twenty years using data from the trials that defined the reference ranges of the World Health Organization manual. MATERIALS AND METHODS Retrospective evaluation of the data used to define the World Health Organization reference ranges. The data from 11 studies, including 3589 participants between 1996-2016, were divided into three period groups based on the decade of study. Differences in semen parameters' distribution were presented in boxplot. P-values were calculated by the Kruskal Wallis rank-sum test followed by Dunn post-hoc test. Analyses were conducted using the R programming language. RESULTS A small decrease was noted in mean sperm concentrations (88.1 million/ml, 87.6 million/ml and 77.2 million/ml for the first second and third decades respectively) (p<0.01). However, the 5th percentile of sperm concentration for the third decade was higher than the first or second decades (18 million/ml vs. 14.9 million/ml and 15 million/ml respectively). No significant differences were noted in progressive motility over the years (p = 0.32). The percent of morphologically normal sperm decreased between the first (24.2%) and the second (12.6%) periods of the study (p<0.001) and then increased in the third decade (14.2%) (p<0.01). While TMC declined between the second and third decades (189 million and 153.9 million respectively, p<0.001), at levels unlikely to decrease fertility. However, the 5th percentile of the TMC remained stable at 24.9, 20.8 and 20.6 million, for the first, second and third decades respectively (p = 0.36). DISCUSSION AND CONCLUSION AND RELEVANCE Trends in sperm parameters over the last three decades do not seem to be clinically significant. This article is protected by copyright. All rights reserved.
Collapse
Affiliation(s)
- Ido Feferkorn
- Division of Reproductive Endocrinology and Infertility, McGill University Health Care Center, 888 Boul. de Maisonneuve E #200, Montréal, QC, H2L 4S8, Canada
| | - Liat Azani
- Department of Molecular Biology, Ariel University, 65 Ramat HaGolan St, Ariel, Israel
| | - Einav Kadour-Peero
- Division of Reproductive Endocrinology and Infertility, McGill University Health Care Center, 888 Boul. de Maisonneuve E #200, Montréal, QC, H2L 4S8, Canada
| | - Ranit Hizkiyahu
- Division of Reproductive Endocrinology and Infertility, McGill University Health Care Center, 888 Boul. de Maisonneuve E #200, Montréal, QC, H2L 4S8, Canada
| | - Guy Shrem
- IVF unit, Department of Obstetrics and Gynecology, Kaplan Medical Center, 1 Derech Pasternak, Rehovot, Israel
| | - Mali Salmon-Divon
- Department of Molecular Biology, Ariel University, 65 Ramat HaGolan St, Ariel, Israel.,Adelson School of Medicine, Ariel University, 65 Ramat HaGolan St, Ariel, Israel
| | - Michael H Dahan
- Division of Reproductive Endocrinology and Infertility, McGill University Health Care Center, 888 Boul. de Maisonneuve E #200, Montréal, QC, H2L 4S8, Canada
| |
Collapse
|
8
|
Osadchuk L, Shantanova L, Troev I, Kleshchev M, Osadchuk A. Regional and ethnic differences in semen quality and reproductive hormones in Russia: A Siberian population-based cohort study of young men. Andrology 2021; 9:1512-1525. [PMID: 33884771 PMCID: PMC8596582 DOI: 10.1111/andr.13024] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 04/12/2021] [Accepted: 04/16/2021] [Indexed: 12/28/2022]
Abstract
Background This is the first large‐scale Russian study describing semen quality and reproductive hormone levels among young men. Objectives The aim of the study was to compare semen quality and reproductive hormone levels in young men of four cities and three ethnic groups living in the Siberian region of Russia and to find out ethnic or environmental reasons for regional differences. Materials and methods The study population consisted of 1291 young men from Novosibirsk, Kemerovo, Ulan‐Ude, and Yakutsk, including 1013 men of three most numerous ethnic groups: Slavs, Buryats, and Yakuts. Each participant provided one sperm and blood sample, information about lifestyle and ethnicity. Anthropometric parameters, semen quality and reproductive hormone levels, were evaluated. Results Significant regional and ethnic differences were detected for semen and reproductive hormone parameters. Median sperm concentrations in Novosibirsk, Kemerovo, Ulan‐Ude, and Yakutsk were 54.6, 39.9, 34.7, 33.1 × 106/ml; total sperm counts—202.5, 138.7, 97.9, 93.4 × 106; percentages of morphologically normal spermatozoa—7.8%, 6.5%, 6.3%, 5.0%, respectively. Median sperm concentrations in Slavs, Buryats, and Yakuts were 43.7, 37.0, 30.6 × 106/ml; total sperm counts—150.0, 102.3 and 74.8 × 106; percentages of morphologically normal spermatozoa—6.8%, 6.8%, 4.8%, respectively. Discussion The young men in Novosibirsk and Kemerovo, populated by Slavs, had a higher semen quality compared to Ulan‐Ude and Yakutsk, populated by Buryats and Yakuts, apparently due to the higher testicular function in Slavic compared to Asian ethnicity. Impaired spermatogenesis in young men in Kemerovo compared to Novosibirsk, located in the same climatic zone and having a socio‐cultural and ethnic identity, may be due to the influence of a polluted environment. Conclusion The findings suggest that ethnic composition and environment may be responsible for regional differences in semen and reproductive hormone parameters.
Collapse
Affiliation(s)
- Ludmila Osadchuk
- Federal Research Center 'Institute of Cytology and Genetics', the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Larisa Shantanova
- Institute of General and Experimental Biology, the Siberian Branch of the Russian Academy of Sciences, Ulan-Ude, Russia
| | - Ivan Troev
- M.K. Ammosov North-Eastern Federal University, Yakutsk, Russia
| | - Maxim Kleshchev
- Federal Research Center 'Institute of Cytology and Genetics', the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Alexander Osadchuk
- Federal Research Center 'Institute of Cytology and Genetics', the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| |
Collapse
|
9
|
Campbell MJ, Lotti F, Baldi E, Schlatt S, Festin MPR, Björndahl L, Toskin I, Barratt CLR. Distribution of semen examination results 2020 - A follow up of data collated for the WHO semen analysis manual 2010. Andrology 2021; 9:817-822. [PMID: 33528873 DOI: 10.1111/andr.12983] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/28/2021] [Accepted: 01/29/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND It is now 11 years since publication of the WHO 2010 guidelines for semen assessment values, and it is critical to determine whether they are still valid and/or whether they should be modified. OBJECTIVES To utilise data published since 2010 and combine these with data used in the 2010 assessment to provide an updated and more comprehensive representation of the fertile man. This may be utilised to present an updated distribution of values for use by WHO in 2021. MATERIALS AND METHODS Two specific analyses were performed namely, (1) Analysis 1: Examination of published data following publication of WHO 2010 [termed 2010-2020 data]. (2) Analysis 2: Examination of the data used to help formulate the 2010 distribution of values combined with the data from Analysis (1) [termed WHO 2020]. RESULTS In total, data from more than 3500 subjects, from twelve countries and five continents were analysed. The 5th centile values for concentration, motility and morphology are: 16 × 106 /ml, 30% progressive motility [42% total motility] and 4% normal forms. DISCUSSION This study presents substantial additional information to establish more comprehensive and globally applicable lower reference values for semen parameters for fertile men although they do not represent distinct limits between fertile and subfertile men. There are still data missing from many countries and, some geographical regions are not represented. Moreover, the number of subjects although significant is still relatively low (<4000). CONCLUSION These distributions of values now include semen analysis providing a more global representation of the fertile man. Increasing the number of subjects provides robust information that is also more geographically representative.
Collapse
Affiliation(s)
- Martin J Campbell
- Division of Systems Medicine, School of Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, Scotland
| | - Francesco Lotti
- Andrology, Female Endocrinology and Gender Incongruence Unit, Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Elisabetta Baldi
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Stefan Schlatt
- Centre of Reproductive Medicine and Andrology, University Hospital of Münster, Münster, Germany
| | - Mario P R Festin
- Department of Obstetrics and Gynaecology, University of the Philippines College of Medicine, Philippine General Hospital, Ermita, Manila, Philippines
| | - Lars Björndahl
- Andrology Laboratory, ANOVA - Karolinska University Hospital & Karolinska Instiutet, Stockholm, Sweden
| | - Igor Toskin
- Department of Sexual and Reproductive Health and Research (SRH), World Health Organization, Geneva, Switzerland
| | - Christopher L R Barratt
- Division of Systems Medicine, School of Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, Scotland
| |
Collapse
|
10
|
Lotti F, Frizza F, Balercia G, Barbonetti A, Behre HM, Calogero AE, Cremers J, Francavilla F, Isidori AM, Kliesch S, La Vignera S, Lenzi A, Marcou M, Pilatz A, Poolamets O, Punab M, Peraza Godoy MF, Rajmil O, Salvio G, Shaeer O, Weidner W, Maseroli E, Cipriani S, Baldi E, Degl’Innocenti S, Danza G, Caldini AL, Terreni A, Boni L, Krausz C, Maggi M. The European Academy of Andrology (EAA) ultrasound study on healthy, fertile men: clinical, seminal and biochemical characteristics. Andrology 2020; 8:1005-1020. [DOI: 10.1111/andr.12808] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 04/16/2020] [Accepted: 04/27/2020] [Indexed: 12/20/2022]
Affiliation(s)
- Francesco Lotti
- Andrology, Female Endocrinology and Gender Incongruence Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| | - Francesca Frizza
- Andrology, Female Endocrinology and Gender Incongruence Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| | - Giancarlo Balercia
- Endocrinology Unit Ospedali Riuniti Ancona Polytechnic University of Marche Ancona Italy
| | - Arcangelo Barbonetti
- Andrology Unit Department of Life, Health and Environmental Sciences University of L’Aquila L’Aquila Italy
| | - Hermann M. Behre
- Center for Reproductive Medicine and Andrology Martin Luther University Halle‐Wittenberg Halle Germany
| | - Aldo E. Calogero
- Department of Clinical and Experimental Medicine University of Catania Italy
| | - Jann‐Frederik Cremers
- Department of Clinical and Surgical Andrology Centre of Reproductive Medicine and Andrology Münster University Hospital Münster Germany
| | - Felice Francavilla
- Andrology Unit Department of Life, Health and Environmental Sciences University of L’Aquila L’Aquila Italy
| | - Andrea M. Isidori
- Department of Experimental Medicine Sapienza University of Rome Rome Italy
| | - Sabine Kliesch
- Department of Clinical and Surgical Andrology Centre of Reproductive Medicine and Andrology Münster University Hospital Münster Germany
| | - Sandro La Vignera
- Department of Clinical and Experimental Medicine University of Catania Italy
| | - Andrea Lenzi
- Department of Experimental Medicine Sapienza University of Rome Rome Italy
| | - Marios Marcou
- Center for Reproductive Medicine and Andrology Martin Luther University Halle‐Wittenberg Halle Germany
| | - Adrian Pilatz
- Department of Urology Pediatric Urology and Andrology Justus Liebig University Giessen Germany
| | | | - Margus Punab
- Andrology Unit Tartu University Hospital Tartu Estonia
| | - Maria Fernanda Peraza Godoy
- Andrology Department Fundació Puigvert Universitat Autònoma de Barcelona Instituto de Investigaciones Biomédicas Sant Pau (IIB‐Sant Pau) Barcelona Spain
| | - Osvaldo Rajmil
- Andrology Department Fundació Puigvert Universitat Autònoma de Barcelona Instituto de Investigaciones Biomédicas Sant Pau (IIB‐Sant Pau) Barcelona Spain
| | - Gianmaria Salvio
- Endocrinology Unit Ospedali Riuniti Ancona Polytechnic University of Marche Ancona Italy
| | - Osama Shaeer
- Department of Andrology Kasr El Aini Faculty of Medicine Cairo University Cairo Egypt
| | - Wolfgang Weidner
- Department of Urology Pediatric Urology and Andrology Justus Liebig University Giessen Germany
| | - Elisa Maseroli
- Andrology, Female Endocrinology and Gender Incongruence Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| | - Sarah Cipriani
- Andrology, Female Endocrinology and Gender Incongruence Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| | - Elisabetta Baldi
- Andrology, Female Endocrinology and Gender Incongruence Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| | - Selene Degl’Innocenti
- Andrology, Female Endocrinology and Gender Incongruence Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| | - Giovanna Danza
- Endocrinology Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| | | | | | - Luca Boni
- Clinical Trials Coordinating Center Toscano Cancer Institute University Hospital Careggi Florence Italy
| | - Csilla Krausz
- Andrology, Female Endocrinology and Gender Incongruence Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| | - Mario Maggi
- Endocrinology Unit Department of Experimental and Clinical Biomedical Sciences “Mario Serio” University of Florence Florence Italy
| |
Collapse
|
11
|
Yuan HF, Shangguan HF, Zheng Y, Meng TQ, Xiong CL, Guan HT. Decline in semen concentration of healthy Chinese adults: evidence from 9357 participants from 2010 to 2015. Asian J Androl 2019; 20:379-384. [PMID: 29493550 PMCID: PMC6038153 DOI: 10.4103/aja.aja_80_17] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The present study aims to analyze sperm concentration trends among young and healthy Chinese adults in Wuhan, Central China, from 2010 to 2015. Semen analysis data from 9357 participants were collected and analyzed using a general linear model and the Cochran–Armitage trend test. A significant decline was observed in sperm concentration (β [standard deviation]: −1.53 [0.16]; P < 0.001). In addition, a decline in sperm density was observed by stratifying student versus nonstudent sperm donors and by analyzing the year of birth or birth year cohort of the participants. Furthermore, the percentage of participants with sperm densities of over 40 × 106 ml−1 significantly decreased with year. Notably, a dramatic decline in sperm density was recorded over the first 5 years of study. This research reported a decline in sperm concentration among young adults in Wuhan, Central China, in 2010–2015.
Collapse
Affiliation(s)
- Hong-Fang Yuan
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | | | - Yi Zheng
- Department of Venereology, Wuhan Institute of Dermatology and Venereology, Wuhan 430031, China
| | - Tian-Qing Meng
- Reproductive Medicine Center, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.,Hubei Province Human Sperm Bank, Wuhan 430030, China
| | - Cheng-Liang Xiong
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.,Reproductive Medicine Center, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.,Hubei Province Human Sperm Bank, Wuhan 430030, China
| | - Huang-Tao Guan
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.,Reproductive Medicine Center, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.,Hubei Province Human Sperm Bank, Wuhan 430030, China
| |
Collapse
|
12
|
Bian J, Shi X, Li Q, Zhao M, Wang L, Lee J, Tao M, Wu X. A novel functional role of nickel in sperm motility and eukaryotic cell growth. J Trace Elem Med Biol 2019; 54:142-149. [PMID: 31109604 DOI: 10.1016/j.jtemb.2019.04.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/29/2019] [Accepted: 04/24/2019] [Indexed: 12/29/2022]
Abstract
BACKGROUND Metal ions are essential for numerous life processes. This study aims to investigate the relationship between seminal quality and ion levels in seminal plasma. BASIC PROCEDURES A total of 205 semen samples were collected and seminal plasma ion levels were examined with inductively-coupled plasma-mass spectrometry. The nickel function was demonstrated by in vitro assay and cell growth. MAIN FINDINGS The low sperm motility group showed distinctively reduced nickel concentration in seminal plasma compared with the normal sperm motility group. However, arsenic, sulfur, selenium, magnesium and zinc were negatively associated with sperm quality. No significant relationship between other examined cations and semen quality was observed. In vitro assay suggested low concentration of nickel significantly increased sperm total motility and progressive motility. Cell growth assay further confirmed nickel promoted eukaryotic yeast cell growth. Nickel level in seminal plasma may play important functions to determine sperm quality. PRINCIPAL CONCLUSIONS Our study reveals a strong correlation between S, Mg, Se, Zn, As, Ni and seminal quality as well as discovers a novel functional role of nickel in sperm motility and eukaryotic cell growth. These findings may provide a potential avenue for assessment of sperm quality and treatment of reproduction disorders.
Collapse
Affiliation(s)
- Jiang Bian
- College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China; Reproductive Medicine Center, Department of Obstetrics and Gynecology, Shanghai Jiaotong University Affiliated Sixth People's Hospital, 200233, Shanghai, China
| | - Xiaohong Shi
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, Shanghai Jiaotong University Affiliated Sixth People's Hospital, 200233, Shanghai, China
| | - Qin Li
- College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China
| | - Miaoyun Zhao
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588, USA
| | - Lingyun Wang
- College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China
| | - Jaekwon Lee
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588, USA
| | - Minfang Tao
- Reproductive Medicine Center, Department of Obstetrics and Gynecology, Shanghai Jiaotong University Affiliated Sixth People's Hospital, 200233, Shanghai, China.
| | - Xiaobin Wu
- College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China.
| |
Collapse
|
13
|
Agarwal A, Panner Selvam MK, Sharma R, Master K, Sharma A, Gupta S, Henkel R. Home sperm testing device versus laboratory sperm quality analyzer: comparison of motile sperm concentration. Fertil Steril 2018; 110:1277-1284. [PMID: 30424879 DOI: 10.1016/j.fertnstert.2018.08.049] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 08/19/2018] [Accepted: 08/21/2018] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To test the ability of the smartphone-based YO Home Sperm Test to accurately and precisely measure motile sperm concentration (MSC) versus the SQA-Vision, an automated laboratory semen analyzer. DESIGN MSC compared for the YO device on Galaxy and iPhone smartphones versus the SQA-Vision in a double-blind manner. SETTING Academic medical center. PATIENT(S) Donor semen samples from 24 men in 144 aliquots. INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) Accuracy, precision, and agreement assessed between the YO device and the SQA-Vision for MSC results. RESULT(S) The YO device demonstrated good correlation and good to moderate agreement with the SQA-Vision for MSC results up to a range of 94 × 106/mL with Pearson and concordance correlation coefficient above 0.92. The YO also showed a very high level of accuracy (97.8%) with positive and negative percent agreement above 94%. The difference in coefficient of variation between the YO and the SQA-Vision was low (between 9.4% and 11.2%) and not statistically significant. The precision among the YO phone devices was lower (16.0%) than the manufacturer's claim of ≤20%. CONCLUSION(S) The smartphone-based device has a high level of accuracy and precision when compared with the SQA-Vision. It can detect samples with abnormally "low" MSC (below 6 × 106/mL cutoff), which supports its use as an effective home sperm test for screening "low" and "moderate/normal" MSC cases. In addition, the device effectively identifies varying levels of normal MSC in a precise manner over a wide range of normal MSC. Thus, the YO Score can improve patient satisfaction and empowerment.
Collapse
Affiliation(s)
- Ashok Agarwal
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, Ohio.
| | | | - Rakesh Sharma
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, Ohio
| | - Kruyanshi Master
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, Ohio
| | - Aditi Sharma
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, Ohio
| | - Sajal Gupta
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, Ohio
| | - Ralf Henkel
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, Ohio; Department of Medical Bioscience, University of the Western Cape, Bellville, South Africa
| |
Collapse
|
14
|
Nogueira C, Yoshida IH, Vilarino FL, Carvalho WPD, Cordts EB, Barbosa CP. Seminal profile of 23,504 patients over the years: 7 years of experience. JBRA Assist Reprod 2018; 22:286-288. [PMID: 30118194 PMCID: PMC6210611 DOI: 10.5935/1518-0557.20180055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Objective To evaluate the behavior of seminal parameters over the years - 2010 to May
2017. Methods A retrospective study, carried out from January 2010 to May 2017, covering
men who underwent sperm examination. Seminal parameters (volume, sperm
concentration, motility, morphology, age and duration of infertility in
years) of 23,504 men were evaluated. The groups were compared to each other
to check whether there were changes to the seminal parameters in that
period. Results There was no change over the years considering the time of infertility, in an
average of 3.78 years. The mean age of the patients was 36.53 years, with a
trend of increase in 0.2 years. In relation to the volume of semen samples,
the mean value was 3.29mL, with a decrease trend in 0.05mL. As for sperm
concentration, the average was 34.37 million/mL, with a decrease trend of
1.0 million/mL. Progressive sperm motility showed an average of 47.27% and
there was a decrease trend of 0.67%. Finally, sperm morphology presented an
average of 2.79% of normal spermatozoa, with a decrease trend of 0.33%. Conclusion It can be noted that over the years, the sperm quality of men looking for
assisted reproduction clinics has tended to decrease in macroscopic and
microscopic parameters (volume, sperm concentration, motility and
morphology).
Collapse
Affiliation(s)
- Camila Nogueira
- Instituto Ideia Fértil de Saúde Reprodutiva, Santo André - SP, Brazil
| | - Ivan Henrique Yoshida
- Instituto Ideia Fértil de Saúde Reprodutiva, Santo André - SP, Brazil.,Faculdade de Medicina do ABC, Santo André - SP, Brazil
| | | | - Waldemar Pereira de Carvalho
- Instituto Ideia Fértil de Saúde Reprodutiva, Santo André - SP, Brazil.,Faculdade de Medicina do ABC, Santo André - SP, Brazil
| | - Emerson Barch Cordts
- Instituto Ideia Fértil de Saúde Reprodutiva, Santo André - SP, Brazil.,Faculdade de Medicina do ABC, Santo André - SP, Brazil
| | | |
Collapse
|
15
|
Paul F, Obajimi GO, Kolade CO. Is semen analysis without strict criteria misleading decisions in IVF? A prospective systematic study. Int J Reprod Biomed 2018; 16:459-462. [PMID: 30234187 PMCID: PMC6129371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Sperm morphology has been strongly linked to fertilization. This makes it an important component in semen analysis. They are usually assessed by world health organization (WHO) standard or Kruger strict criteria in in-vitro fertilization (IVF) centers all over the world. Sperm count, motility, and morphology together form the basis by which patients are allocated into IVF or intra-cytoplasmic sperm injection. OBJECTIVE This study aimed to compare fertilization rates in standard IVF from patients with normal sperm count and motility with and without morphological assessment by WHO guideline. MATERIALS AND METHODS In this prospective cohort study, sperm count, motility, and morphology of 504 men candidate for IVF program over a three years period in our center were evaluated in two groups: Group A (case group) included men with normal sperm count and motility but with a poor morphology and group B (control group) included men with normal sperm count, motility and morphology evaluated by WHO criteria. Fertilization rate in both groups were then analyzed after 16-18 hr post insemination. RESULTS Fertilization rate was higher in group B (p=0.028). Participants in group B, apart from having a normal sperm count (32.9±7.2) and motility (62.4±8.9), have a strict morphology of ≥30%. Our result has shown that spermatozoa in group B had a higher fertilization rate (71.4%). Though the sperm count (36.4±6.7) and motility (66.3±7.4) in group A were slightly higher (p=0.058 and p=0.060 respectively) than group B, the fertilization rate was lower. CONCLUSION Our study showed that sperm morphology could be a very important consideration before decisions towards allocation of patients into IVF or intra-cytoplasmic sperm injection.
Collapse
Affiliation(s)
- Faduola Paul
- Vine Branch Fertility Clinic, Mokola, Ibadan, Nigeria.
| | - Gbolahan Oladele Obajimi
- University of Ibadan, College of Medicine, Department of Obstetrics and Gynaecology and University College Hospital, Ibadan, Nigeria.
| | | |
Collapse
|
16
|
Paul F, Oladele Obajimi G, Olubukunmi Kolade C. Is semen analysis without strict criteria misleading decisions in IVF? A prospective systematic study. Int J Reprod Biomed 2018. [DOI: 10.29252/ijrm.16.7.459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
|
17
|
Zedan H, Ismail S, Gomaa A, Saleh R, Henkel R, Agarwal A. Evaluation of reference values of standard semen parameters in fertile Egyptian men. Andrologia 2018; 50:e12942. [PMID: 29336040 DOI: 10.1111/and.12942] [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] [Accepted: 10/09/2017] [Indexed: 11/28/2022] Open
Abstract
The reference values of human semen, published in the WHO's latest edition in 2010, were lower than those previously reported. The objective of this study was to evaluate reference values of standard semen parameters in fertile Egyptian men. This cross-sectional study included 240 fertile men. Men were considered fertile when their wives had recent spontaneous pregnancies with time to pregnancy (TTP) ≤12 months. The mean age of fertile men was 33.8 ± 0.5 years (range 20-55 years). The 5th percentiles (95% confidence interval) of macroscopic semen parameters were 1.5 ml for volume and 7.2 for pH. The 5th percentiles of microscopic parameters were 15 million/ml for sperm concentration, 30 million per ejaculate for total sperm count, 50% for total motility, 40% for progressive motility, 62% for vitality, 4% for normal sperm forms and 0.1 million/ml for seminal leucocyte counts. In conclusion, fertile Egyptian men had higher reference values of sperm total motility, progressive motility and vitality, and lower reference values for total sperm counts as compared to those determined by the latest edition of the WHO laboratory manual in 2010. Other semen parameters were identical to those defined by the WHO 2010 manual.
Collapse
Affiliation(s)
- H Zedan
- Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Assiut University, Assuit, Egypt
| | - S Ismail
- Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Assiut University, Assuit, Egypt
| | - A Gomaa
- Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Assiut University, Assuit, Egypt
| | - R Saleh
- Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Sohag University, Sohag, Egypt
| | - R Henkel
- Department of Medical Bioscience, University of the Western Cape, Bellville, South Africa
| | - A Agarwal
- Department of Urology, American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, OH, USA
| |
Collapse
|
18
|
Sun PB, Xu HM, Li K, Li HC, Chen AJ, Chen MJ, Dai HT, Ni Y. Sperm cystic fibrosis transmembrane conductance regulator expression level is relevant to fecundity of healthy couples. Andrologia 2017; 50. [PMID: 28762521 DOI: 10.1111/and.12865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/12/2017] [Indexed: 11/29/2022] Open
Abstract
Cystic fibrosis transmembrane conductance regulator (CFTR) is relevant to sperm quality, sperm capacitation and male fertility. However, it is still unknown whether CFTR can be a potential parameter for fecundity prediction in healthy couples. In this study, 135 healthy couples were divided into groups according to their fertility. We demonstrated that the sperm CFTR expression level of healthy males who never impregnated their partners (49 cases, 38.68 ± 2.71%) was significantly lower than that of fertile men (86 cases, 46.35 ± 2.32%). Sperm CFTR expression level accurately corresponded with fertility through the logistic regression model. Receiver operating characteristic (ROC) curve analysis showed that the cut-off value of sperm CFTR expression level for fecundity prediction was 43.75%. Furthermore, cumulative pregnancy rates (CPRs) of CFTR > 43.75% group and CFTR ≤ 43.75% group during the follow-up periods were 80.6% and 49.3% respectively. Meanwhile, the mean time to pregnancy (TTP) of CFTR ≤ 43.75% group (26.79 ± 2.35) was significantly longer than that of CFTR > 43.75% group (16.46 ± 2.42). Therefore, sperm CFTR expression level is relevant to fecundity of healthy couples and shows potential predictive capacity of fecundity.
Collapse
Affiliation(s)
- P-B Sun
- Department of Reproductive Physiology, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang, China
| | - H-M Xu
- Department of Andrology, Zhejiang Family Planning Research Institute, Hangzhou, Zhejiang, China
| | - K Li
- Centre for Reproductive Medicine, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang, China
| | - H-C Li
- Department of Reproductive Physiology, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang, China
| | - A-J Chen
- Department of Reproductive Physiology, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang, China
| | - M-J Chen
- Maternal and Child Health and Family Planning Service Centre of Shangyu District, Shaoxing, Zhejiang, China
| | - H-T Dai
- Maternal and Child Health and Family Planning Service Centre of Keqiao District, Shaoxing, Zhejiang, China
| | - Y Ni
- Department of Reproductive Physiology, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang, China
| |
Collapse
|
19
|
Beal MA, Yauk CL, Marchetti F. From sperm to offspring: Assessing the heritable genetic consequences of paternal smoking and potential public health impacts. MUTATION RESEARCH. REVIEWS IN MUTATION RESEARCH 2017; 773:26-50. [PMID: 28927533 DOI: 10.1016/j.mrrev.2017.04.001] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 04/05/2017] [Accepted: 04/07/2017] [Indexed: 12/16/2022]
Abstract
Individuals who smoke generally do so with the knowledge of potential consequences to their own health. What is rarely considered are the effects of smoking on their future children. The objective of this work was to review the scientific literature on the effects of paternal smoking on sperm and assess the consequences to offspring. A literature search identified over 200 studies with relevant data in humans and animal models. The available data were reviewed to assess the weight of evidence that tobacco smoke is a human germ cell mutagen and estimate effect sizes. These results were used to model the potential increase in genetic disease burden in offspring caused by paternal smoking, with specific focus on aneuploid syndromes and intellectual disability, and the socioeconomic impacts of such an effect. The review revealed strong evidence that tobacco smoking is associated with impaired male fertility, and increases in DNA damage, aneuploidies, and mutations in sperm. Studies support that these effects are heritable and adversely impact the offspring. Our model estimates that, with even a modest 25% increase in sperm mutation frequency caused by smoke-exposure, for each generation across the global population there will be millions of smoking-induced de novo mutations transmitted from fathers to offspring. Furthermore, paternal smoking is estimated to contribute to 1.3 million extra cases of aneuploid pregnancies per generation. Thus, the available evidence makes a compelling case that tobacco smoke is a human germ cell mutagen with serious public health and socio-economic implications. Increased public education should be encouraged to promote abstinence from smoking, well in advance of reproduction, to minimize the transmission of harmful mutations to the next-generation.
Collapse
Affiliation(s)
- Marc A Beal
- Carleton University, Ottawa, Ontario K1S 5B6, Canada; Environmental Health Science and Research Bureau, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario K1A 0K9, Canada
| | - Carole L Yauk
- Environmental Health Science and Research Bureau, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario K1A 0K9, Canada
| | - Francesco Marchetti
- Environmental Health Science and Research Bureau, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario K1A 0K9, Canada.
| |
Collapse
|
20
|
Sengupta P, Dutta S, Krajewska-Kulak E. The Disappearing Sperms: Analysis of Reports Published Between 1980 and 2015. Am J Mens Health 2016; 11:1279-1304. [PMID: 27099345 DOI: 10.1177/1557988316643383] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Reports regarding the changes in sperm concentration in different counties of the world are inconsistent. Furthermore, the reports that sprung up from specific epidemiological and experimental examinations did not include data of prior studies or geographical variations. The current study, following a previous report of massive fall in semen volume over the past 33 years, attempts to delineate the trend of altering sperm concentrations and factors responsible for this by reviewing article published from 1980 to July 2015 with geographic differences. The current study identified an overall 57% diminution in mean sperm concentration over the past 35 years ( r = -.313, p = .0002), which, when analyzed for each geographical region, identified a significant decline in North America, Europe, Asia, and Africa. An increasing trend of sperm concentration was identified only in Australia. The association of male age with such a trend ( R2 = .979) is reported. The authors also correlated male fertility with sperm concentration. Thus, this comprehensive, evidence-based literature review aims to concisely and systematically present the available data on sperm concentration from 1980 to 2015, as well as to statistically analyze the same and correlate male health with the declining pattern of sperm count in a single scientific review to serve the scientific research zone related to reproductive health. It points to the threat of male infertility in times ahead.
Collapse
Affiliation(s)
| | - Sulagna Dutta
- 2 Ex-guest Teacher, Serampore College, University of Calcutta, Kolkata, West Bengal, India
| | | |
Collapse
|