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Gershoni M, Braun T, Hauser R, Barda S, Lehavi O, Malcov M, Frumkin T, Kalma Y, Pietrokovski S, Arama E, Kleiman SE. A pathogenic variant in the uncharacterized RNF212B gene results in severe aneuploidy male infertility and repeated IVF failure. HGG ADVANCES 2023; 4:100189. [PMID: 37124137 PMCID: PMC10133878 DOI: 10.1016/j.xhgg.2023.100189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 03/28/2023] [Indexed: 05/02/2023] Open
Abstract
Quantitative and qualitative spermatogenic impairments are major causes of men's infertility. Although in vitro fertilization (IVF) is effective, some couples persistently fail to conceive. To identify causal variants in patients with severe male infertility factor and repeated IVF failures, we sequenced the exome of two consanguineous family members who underwent several failed IVF cycles and were diagnosed with low sperm count and motility. We identified a rare homozygous nonsense mutation in a previously uncharacterized gene, RNF212B, as the causative variant. Recurrence was identified in another unrelated, infertile patient who also faced repeated failed IVF treatments. scRNA-seq demonstrated meiosis-specific expression of RNF212B. Sequence analysis located a protein domain known to be associated with aneuploidy, which can explain multiple IVF failures. Accordingly, FISH analysis revealed a high aneuploidy rate in the patients' sperm cells and their IVF embryos. Finally, inactivation of the Drosophila orthologs significantly reduced male fertility. Given that members of the evolutionary conserved RNF212 gene family are involved in meiotic recombination and crossover maturation, our findings indicate a critical role of RNF212B in meiosis, genome stability, and in human fertility. Since recombination is completely absent in Drosophila males, our findings may indicate an additional unrelated role for the RNF212-like paralogs in spermatogenesis.
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Affiliation(s)
- Moran Gershoni
- ARO-The Volcani Center Institute of Animal Science, Bet Dagan, Israel
- Corresponding author
| | - Tslil Braun
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Ron Hauser
- Racine IVF Unit and Male Fertility Clinic and Sperm Bank, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Shimi Barda
- Racine IVF Unit and Male Fertility Clinic and Sperm Bank, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ofer Lehavi
- Racine IVF Unit and Male Fertility Clinic and Sperm Bank, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Mira Malcov
- Racine IVF Unit and Male Fertility Clinic and Sperm Bank, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Tsvia Frumkin
- Racine IVF Unit and Male Fertility Clinic and Sperm Bank, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Yael Kalma
- Racine IVF Unit and Male Fertility Clinic and Sperm Bank, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Shmuel Pietrokovski
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
- Corresponding author
| | - Eli Arama
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
- Corresponding author
| | - Sandra E. Kleiman
- Racine IVF Unit and Male Fertility Clinic and Sperm Bank, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Corresponding author
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2
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Zhu S, Zhu Y, Zhang F, Wu J, Lei C, Jiang F. Comprehensive chromosome FISH assessment of sperm aneuploidy in normozoospermic males. J Assist Reprod Genet 2022; 39:1887-1900. [PMID: 35731322 PMCID: PMC9428091 DOI: 10.1007/s10815-022-02536-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 06/04/2022] [Indexed: 01/19/2023] Open
Abstract
PURPOSE Sperm chromosomal abnormalities impact male fertility and pregnancy outcomes. However, the proportion of sperm with chromosomal abnormalities in normozoospermic men remains unclear. Herein, we evaluated sperm aneuploidy for 23 chromosomes to elucidate its incidence in normozoospermic men. METHODS Sperm from ten normozoospermic donors were obtained from a human sperm bank and analyzed using fluorescence in situ hybridization. The frequencies of nullisomy, disomy, and diploidy were analyzed along with trisomy, triploidy, tetraploidy, and other numerical abnormalities per chromosome and per donor levels. RESULTS A total of 248,811 sperm cells were analyzed (average: 24,881 ± 381 cells/donor), of which 246, 658 were haploid, 818 nullisomic, 393 disomic, 894 diploid, 13 triploid, 8 tetraploid, 3 trisomic, and 24 harbored multiple aneuploidies. Among the 22 autosomal and 2 sex chromosomes, the mean frequency of aneuploidy per chromosome was 0.49 ± 0.16%, including 0.33 ± 0.16% for nullisomy and 0.16 ± 0.08% for disomy. The mean frequencies of nullisomy, disomy, and aneuploidy per donor were 0.33 ± 0.13%, 0.16 ± 0.05%, and 0.49 ± 0.13%, respectively. The total frequencies of nullisomy, disomy, diploidy, and aneuploidy per donor were 7.62 ± 3.06%, 3.63 ± 1.12%, 0.36 ± 0.15%, and 11.25 ± 3.05%, respectively. CONCLUSIONS The dominant chromosome numerical abnormalities in normozoospermic men are nullisomy, disomy, and diploidy. Generally, the frequency of nullisomy is higher than that of disomy. The disomy or nullisomy frequencies for each chromosome being gained or lost were not unified and varied; some chromosomes (e.g., chromosomes 21 and 22 and sex chromosomes) are more prone to disomy while some others (e.g., chromosome 3) are more prone to nullisomy.
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Affiliation(s)
- Saijuan Zhu
- Shanghai Ji Ai Genetics & IVF Institute, Shanghai, 200011 China
| | - Yong Zhu
- grid.8547.e0000 0001 0125 2443Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011 China
| | - Feng Zhang
- grid.8547.e0000 0001 0125 2443Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011 China
| | - Jiangnan Wu
- grid.8547.e0000 0001 0125 2443Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011 China
| | - Caixia Lei
- Shanghai Ji Ai Genetics & IVF Institute, Shanghai, 200011 China ,grid.8547.e0000 0001 0125 2443Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011 China
| | - Feng Jiang
- Shanghai Ji Ai Genetics & IVF Institute, Shanghai, 200011 China
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Tarlycheva AA, Markova ZG, Yurchenko DA, Shilova NV. Optimization of the sperm processing protocol for subsequent molecular cytogenetic studies. Klin Lab Diagn 2021; 66:603-609. [PMID: 34665946 DOI: 10.51620/0869-2084-2021-66-10-603-609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
One of the causes of spontaneous pregnancy termination, infertility, and birth of children with development delay and malformations are chromosomal abnormalities (CA) as well as spontaneous aneuploidies in gametes of phenotypically normal parents. Often couples with reproductive problems, as well as spouses one of whom is a carrier of CA, turn to the programs of assisted reproductive technologies (ART) for preimplantation evaluation of the zygote chromosomal status. As part of ART programs, parental gametes are examined to assess the level of spontaneous aneuploidy. As a rule, the most accessible material for analysis is the ejaculate. Fluorescent in situ hybridization (FISH) is used to examine male gametes obtained from the ejaculate. However, this FISH-analysis has a number of limitations and difficulties because of the peculiarities of the sperm head structure, namely the supercondensed state of chromosome chromatin. In order to optimize the FISH protocol, five different protocols were used for pre-hybridization processing of ejaculate samples obtained from nine phenotypically normal men. A comparative analysis of hybridization efficiency showed that the protocol using tris(2-carboxyethyl)phosphine hydrochloride (TCEP) as a decondensation agent was the most effective for subsequent molecular cytogenetic studies. The developed hybrid protocol combining proteolytic pretreatment, TCEP and thermal decondensation can be used when other protocols for pre-hybridization treatment of ejaculate preparations are not effective.
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4
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Navarro B, Gómez-Giménez B, Urizar-Arenaza I, Ganzabal T, Martín S, Subiran N. Sperm nullisomy is not associated with routine semen parameters but it negatively impacts on ICSI outcomes. Andrologia 2021; 53:e14026. [PMID: 33871908 DOI: 10.1111/and.14026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 01/26/2021] [Accepted: 02/14/2021] [Indexed: 11/27/2022] Open
Abstract
Sperm aneuploidy is a result of mis-segregation during meiosis and correlates with male infertility. Among the types of aneuploidy, nullisomy has been reported to be more prevalent in human spermatozoa than disomy; however, nullisomy is not always assessed by FISH, and its relation with basic semen parameters is almost unknown. To establish an association between nullisomy and semen parameters and pathologies, we evaluated the potential clinical value of semen analysis and assessed the diagnosis of sperm nullisomy. A prospective study including a total of 130 patients and 25 donors aged 30-50 years with a normal karyotype was carried out. Sperm FISH analyses were performed, and basic semen parameters and ART outcome data were collected. There were no associations between sperm nullisomy of chromosomes 13, 15, 18, 21, 22, X and Y and basic semen parameters. The odds of nullisomy of chromosomes 13, 15, 16, 17, 18, 21, 22, X and Y were not related to semen pathologies. However, sperm nullisomy had a negative impact on ART outcomes, with significant decreases in fertilisation, blastocyst, pregnancy and implantation rates after ICSI. Sperm nullisomy diagnoses are not detected in semen analyses and are a possible cause of idiopathic male infertility and unexplained recurrent pregnancy loss.
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Affiliation(s)
- Beatriz Navarro
- Centre for Reproductive Medicine and Infertility Quirón Bilbao, Bilbao, Spain
| | - Belén Gómez-Giménez
- Department of Physiology, University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Itziar Urizar-Arenaza
- Department of Physiology, University of the Basque Country (UPV/EHU), Leioa, Spain.,Biocruces Bizkaia Health Research Institute, Barakaldo, Spain
| | - Teresa Ganzabal
- Centre for Reproductive Medicine and Infertility Quirón Bilbao, Bilbao, Spain
| | - Sergio Martín
- MEPRO Medical Reproductive Solutions, Donostia-San Sebastian, Spain
| | - Nerea Subiran
- Department of Physiology, University of the Basque Country (UPV/EHU), Leioa, Spain.,Biocruces Bizkaia Health Research Institute, Barakaldo, Spain.,MEPRO Medical Reproductive Solutions, Donostia-San Sebastian, Spain
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5
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Wiland E, Olszewska M, Woźniak T, Kurpisz M. How much, if anything, do we know about sperm chromosomes of Robertsonian translocation carriers? Cell Mol Life Sci 2020; 77:4765-4785. [PMID: 32514588 PMCID: PMC7658086 DOI: 10.1007/s00018-020-03560-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 05/08/2020] [Accepted: 05/22/2020] [Indexed: 12/11/2022]
Abstract
In men with oligozoospermia, Robertsonian translocations (RobTs) are the most common type of autosomal aberrations. The most commonly occurring types are rob(13;14) and rob(14;21), and other types of RobTs are described as 'rare' cases. Based on molecular research, all RobTs can be broadly classified into Class 1 and Class 2. Class 1 translocations produce the same breakpoints within their RobT type, but Class 2 translocations are predicted to form during meiosis or mitosis through a variety of mechanisms, resulting in variation in the breakpoint locations. This review seeks to analyse the available data addressing the question of whether the molecular classification of RobTs into Classes 1 and 2 and/or the type of DD/GG/DG symmetry of the involved chromosomes is reflected in the efficiency of spermatogenesis. The lowest frequency value calculated for the rate of alternate segregants was found for rob(13;15) carriers (Class 2, symmetry DD) and the highest for rob(13;21) carriers (Class 2, DG symmetry). The aneuploidy values for the rare RobT (Class 2) and common rob(14;21) (Class 1) groups together exhibited similarities while differing from those for the common rob(13;14) (Class 1) group. Considering the division of RobT carriers into those with normozoospermia and those with oligoasthenozoospermia, it was found that the number of carriers with elevated levels of aneuploidy was unexpectedly quite similar and high (approx. 70%) in the two subgroups. The reason(s) that the same RobT does not always show a similar destructive effect on fertility was also pointed out.
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Affiliation(s)
- Ewa Wiland
- Institute of Human Genetics, Polish Academy of Sciences, ul. Strzeszynska 32, 60-479, Poznan, Poland
| | - Marta Olszewska
- Institute of Human Genetics, Polish Academy of Sciences, ul. Strzeszynska 32, 60-479, Poznan, Poland
| | - Tomasz Woźniak
- Institute of Human Genetics, Polish Academy of Sciences, ul. Strzeszynska 32, 60-479, Poznan, Poland
| | - Maciej Kurpisz
- Institute of Human Genetics, Polish Academy of Sciences, ul. Strzeszynska 32, 60-479, Poznan, Poland.
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6
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Tolmacheva EN, Vasilyev SA, Lebedev IN. Aneuploidy and DNA Methylation as Mirrored Features of Early Human Embryo Development. Genes (Basel) 2020; 11:E1084. [PMID: 32957536 PMCID: PMC7564410 DOI: 10.3390/genes11091084] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/08/2020] [Accepted: 09/15/2020] [Indexed: 12/18/2022] Open
Abstract
Genome stability is an integral feature of all living organisms. Aneuploidy is the most common cause of fetal death in humans. The timing of bursts in increased aneuploidy frequency coincides with the waves of global epigenetic reprogramming in mammals. During gametogenesis and early embryogenesis, parental genomes undergo two waves of DNA methylation reprogramming. Failure of these processes can critically affect genome stability, including chromosome segregation during cell division. Abnormal methylation due to errors in the reprogramming process can potentially lead to aneuploidy. On the other hand, the presence of an entire additional chromosome, or chromosome loss, can affect the global genome methylation level. The associations of these two phenomena are well studied in the context of carcinogenesis, but here, we consider the relationship of DNA methylation and aneuploidy in early human and mammalian ontogenesis. In this review, we link these two phenomena and highlight the critical ontogenesis periods and genome regions that play a significant role in human reproduction and in the formation of pathological phenotypes in newborns with chromosomal aneuploidy.
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Affiliation(s)
- Ekaterina N. Tolmacheva
- Research Institute of Medical Genetics, Tomsk National Research Medical Center, 634050 Tomsk, Russia; (S.A.V.); (I.N.L.)
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7
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Jiang S, Peng X, Gong F, Huang C, Peng Y, Long X, Lin G, Zhu W. The role of total chromosomal disomy in human spermatozoa as a predictor of the outcome of pre-implantation genetic screening. Fertil Steril 2020; 113:1196-1204.e1. [PMID: 32416980 DOI: 10.1016/j.fertnstert.2020.02.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 02/06/2020] [Accepted: 02/06/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE To assess the efficacy of sperm disomy rate as a predictor of preimplantation genetic screening (PGT-A) outcomes. DESIGN Retrospective cohort study. SETTING Andrology laboratory and in vitro fertilization center. PATIENT(S) All patients (n = 123) who underwent sperm fluorescence in situ hybridization and PGT-A at the China International Trust and Investment Corporation Xiangya Reproductive and Genetic Hospital between January 2015 and November 2018 were included. INTERVENTION(S) Sperm samples of all patients evaluated for elevated disomy levels of 24 chromosomes using multicolor sperm fluorescence in situ hybridization and all embryos were cultured and biopsied at the blastocyst stage for PGT-A. MAIN OUTCOME MEASURE(S) The relationship between the whole genome of sperm disomy rate and PGT-A outcome and the predictive effect of the whole genome of sperm disomy rate on PGT-A outcome. RESULT(S) A statistically significant correlation was observed between the sperm disomy rate and PGT-A outcome. Many confounders were considered, such as patients' factors, semen or laboratory characteristics, which may affect PGT-A outcome. Regression analysis excluding these confounding factors indicated a 2.071-fold decrease in odds of probability of not obtaining any euploid embryo to transfer for every 1% decrease in total disomy rate. Based on a total disomy rate threshold of 4.84%, the prediction ability of total disomy rate on PGT-A outcome reached 75.6%. CONCLUSION(S) There is a negative correlation between the whole genome of sperm disomy rate and PGT-A outcome. It is a potential role for whole genome of sperm disomy rate in the PGT-A patients as a predictor, as well as in future genetic counselling. Based on these results, genetic counselors can advise couples on the risk of not obtaining any euploid embryo and help them choose the best reproductive and diagnostic method.
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Affiliation(s)
- Suhua Jiang
- Institute of Reproductive and Stem Cell Engineering, Basic Medicine College, Central South University, Changsha, Hunan, People's Republic of China
| | - Xiangjie Peng
- Reproductive and Genetic Hospital of China International Trust and Investment Corporation-Xiangya, Changsha, Hunan, People's Republic of China
| | - Fei Gong
- Institute of Reproductive and Stem Cell Engineering, Basic Medicine College, Central South University, Changsha, Hunan, People's Republic of China; Reproductive and Genetic Hospital of China International Trust and Investment Corporation-Xiangya, Changsha, Hunan, People's Republic of China
| | - Chuan Huang
- Reproductive and Genetic Hospital of China International Trust and Investment Corporation-Xiangya, Changsha, Hunan, People's Republic of China
| | - Yangqin Peng
- Reproductive and Genetic Hospital of China International Trust and Investment Corporation-Xiangya, Changsha, Hunan, People's Republic of China
| | - Xingyu Long
- Reproductive and Genetic Hospital of China International Trust and Investment Corporation-Xiangya, Changsha, Hunan, People's Republic of China
| | - Ge Lin
- Institute of Reproductive and Stem Cell Engineering, Basic Medicine College, Central South University, Changsha, Hunan, People's Republic of China; Reproductive and Genetic Hospital of China International Trust and Investment Corporation-Xiangya, Changsha, Hunan, People's Republic of China
| | - Wenbing Zhu
- Institute of Reproductive and Stem Cell Engineering, Basic Medicine College, Central South University, Changsha, Hunan, People's Republic of China; Reproductive and Genetic Hospital of China International Trust and Investment Corporation-Xiangya, Changsha, Hunan, People's Republic of China.
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8
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Sachdeva K, Upadhyay D, Neri JG, Varghese MM, Singh K, Albuz FK, Aujero MV, Solkar S, Stevikova M, Peramo B. Semen Quality is Associated with Sperm Aneuploidy and DNA Fragmentation in the United Arab Emirates Population. Genet Test Mol Biomarkers 2020; 24:195-203. [PMID: 32208936 DOI: 10.1089/gtmb.2019.0180] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background: Sperm chromosome aneuploidy and the extent of sperm DNA fragmentation (SDF) are contributing factors to male infertility. Their extent can be measured using platforms such as sperm chromatin dispersion (SCD) and sperm fluorescence in situ hybridization (sFISH). Additional studies, however, are needed to understand the clinical applicability of these in vitro tests based on statistically validated thresholds. Aim: The primary objective of this study was to report the incidence of SDF and chromosomal aneuploidy with respect to sperm quality in the United Arab Emirates (UAE) population. In addition, we wished to establish clinically useful SDF and aneuploidy cutoff values. Materials and Methods: A total of 302 subjects were enrolled in this study. The control group consisted of n = 100 (33.11%) reproductively-proven fertile men, and the case group consisted of n = 202 (66.89%) infertile men. The sperm quality of the cases was further subclassified as normospermia ("Normo," n = 88; 43.56%); teratozoospermia ("T," n = 40; 19.80%); oligoasthenoteratozoospermia ("OAT," n = 37; 18.32%); asthenoteratozoospermia ("AT," n = 19; 9.41%); or oligoteratozoospermia ("OT," n = 18; 8.91%). The assessments of SDF were done using SCD tests. Chromosomal aneuploidy (Chr 13, 18, 21, X, and Y) was investigated using sFISH. Furthermore, based on the fragmentation index, cases were divided into subfertile groups defined as low, medium, high, and severe. The Mann-Whitney test was used to set the upper threshold value for sFISH, and the odds ratio was used for SDF assessment. Results: Cases having sperm quality "AT," "OAT," and "OT" together with the moderate, high, and severe subfertile groups had the highest DNA fragmentation indices: 31.58%, 27.03%, and 22.22%, respectively. In the sFISH analyses, groups with sperm quality "OAT," "T," and "OT" exhibited high degrees of abnormalities: 86.49%, 52.50%, and 50%, respectively. The most common chromosomal abnormalities found were "sex chromosome hyperploidy (XY18)" and "diploid (Chr 13, 21)." The incidences of sperm quality with respect to SDF and sFISH are also reported in detail. Conclusions: This is the first study in the UAE which shows SDF and sFISH incidences together with sperm quality. This study also establishes SDF and sFISH cutoff values for the UAE population.
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Affiliation(s)
- Kabir Sachdeva
- Genetics Laboratory, Al Ain Fertility Centre, Al Ain, United Arab of Emirates
| | - Divyesh Upadhyay
- Genetics Laboratory, Al Ain Fertility Centre, Al Ain, United Arab of Emirates
| | - Joan Genevieve Neri
- Genetics Laboratory, Al Ain Fertility Centre, Al Ain, United Arab of Emirates
| | | | - Kanhaiya Singh
- Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana
| | - Firas Kamal Albuz
- Andrology Laboratory, Al Ain Fertility Centre, Al Ain, United Arab of Emirates
| | | | - Sadika Solkar
- IVF Laboratory, Al Ain Fertility Centre, Al Ain, United Arab of Emirates
| | - Martina Stevikova
- IVF Laboratory, Al Ain Fertility Centre, Al Ain, United Arab of Emirates
| | - Braulio Peramo
- IVF Laboratory, Al Ain Fertility Centre, Al Ain, United Arab of Emirates
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9
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Fabig G, Kiewisz R, Lindow N, Powers JA, Cota V, Quintanilla LJ, Brugués J, Prohaska S, Chu DS, Müller-Reichert T. Male meiotic spindle features that efficiently segregate paired and lagging chromosomes. eLife 2020; 9:50988. [PMID: 32149606 PMCID: PMC7101234 DOI: 10.7554/elife.50988] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 03/08/2020] [Indexed: 01/25/2023] Open
Abstract
Chromosome segregation during male meiosis is tailored to rapidly generate multitudes of sperm. Little is known about mechanisms that efficiently partition chromosomes to produce sperm. Using live imaging and tomographic reconstructions of spermatocyte meiotic spindles in Caenorhabditis elegans, we find the lagging X chromosome, a distinctive feature of anaphase I in C. elegans males, is due to lack of chromosome pairing. The unpaired chromosome remains tethered to centrosomes by lengthening kinetochore microtubules, which are under tension, suggesting that a ‘tug of war’ reliably resolves lagging. We find spermatocytes exhibit simultaneous pole-to-chromosome shortening (anaphase A) and pole-to-pole elongation (anaphase B). Electron tomography unexpectedly revealed spermatocyte anaphase A does not stem solely from kinetochore microtubule shortening. Instead, movement of autosomes is largely driven by distance change between chromosomes, microtubules, and centrosomes upon tension release during anaphase. Overall, we define novel features that segregate both lagging and paired chromosomes for optimal sperm production.
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Affiliation(s)
- Gunar Fabig
- Experimental Center, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Robert Kiewisz
- Experimental Center, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | | | - James A Powers
- Light Microscopy Imaging Center, Indiana University, Bloomington, United States
| | - Vanessa Cota
- Department of Biology, San Francisco State University, San Francisco, United States
| | - Luis J Quintanilla
- Department of Biology, San Francisco State University, San Francisco, United States
| | - Jan Brugués
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Max Planck Institute for the Physics of Complex Systems, Dresden, Germany.,Centre for Systems Biology Dresden, Dresden, Germany
| | | | - Diana S Chu
- Department of Biology, San Francisco State University, San Francisco, United States
| | - Thomas Müller-Reichert
- Experimental Center, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
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10
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Albertini DF. Rediscovering FISH in the midst of a sperm chromatin conundrum. J Assist Reprod Genet 2019; 36:1973-1974. [PMID: 31625033 DOI: 10.1007/s10815-019-01600-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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