Journal articles: 'Spermiogenese'

1

Bandtlow, K. H., and H. Marberger. "Antitrichomonadenmittel und Spermiogenese." Andrologia 5, no. 2 (April 24, 2009): 109–11. http://dx.doi.org/10.1111/j.1439-0272.1973.tb00337.x.

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2

Meyhöfer, W. "Auswirkungen von Cytostatika auf die Spermiogenese." Andrologia 5, no. 2 (April 24, 2009): 107–8. http://dx.doi.org/10.1111/j.1439-0272.1973.tb00335.x.

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3

Eigenmann, J., and K. Bandhauer. "Medikamentös induzierte Störungen der Spermiogenese und der erektilen Potenz." Aktuelle Urologie 19, no. 03 (May 1988): 124–29. http://dx.doi.org/10.1055/s-2008-1061366.

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Jarpa, Adolfo, and Juan Donoso. "Untersuchungen über die Hemmung der Spermiogenese durch Depot-Gestagene*." Andrologia 1, no. 3 (April 24, 2009): 107–12. http://dx.doi.org/10.1111/j.1439-0272.1969.tb00541.x.

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MELANDER, Y., and O. KNUDSEN. "THE SPERMIOGENESE OF THE BULL FROM A KARYOLOGICAL POINT OF VIEW." Hereditas 39, no. 3-4 (July 9, 2010): 505–17. http://dx.doi.org/10.1111/j.1601-5223.1953.tb03434.x.

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6

Iványi, P., J. Raboch, and H. Vybíralová. "HL-A Antigene bei Patienten mit Spermiogenese-Stop und ihren Brüdern." Andrologia 2, no. 1 (April 24, 2009): 9–11. http://dx.doi.org/10.1111/j.1439-0272.1970.tb00423.x.

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7

Reschke, Felix. "Hormontherapie bei Hodenhochstand." Aktuelle Urologie 51, no. 02 (November 21, 2019): 178–82. http://dx.doi.org/10.1055/a-1036-7063.

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ZusammenfassungDer Hodenhochstand stellt eine sehr häufige angeborene Normvariante des Urogenitaltrakts dar. Dabei ist bekannt, dass infolge der Fehllage des Hodens seine normale Entwicklung eingeschränkt sein kann. Eine Folge daraus ist ein erhöhtes Entartungsrisiko sowie eine verminderte Spermiogenese und Fertilität. Zwischen den verschiedenen Fachrichtungen besteht internationaler Konsens darüber, dass die Behandlung des maldeszendierten Hodens spätestens zum ersten Geburtstag abgeschlossen sein sollte. Gemäß der deutschen AWMF-Leitlinie soll die hormonelle Therapie Patienten mit beidseitigem Hodenhochstand angeboten werden. Der nachfolgende Artikel wird die Rationale hinter dieser Empfehlung unter Einbezug der aktuellen Literatur erörtern.

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8

Osmonov, D., C. van der Horst, T. Weyel, M. Danilevicius, P. Braun, P. Alken, K. Jünemann, and F. Portillo. "Induktion der Spermiogenese nach antegrader Varikozelensklerosierung bei Patienten mit nicht-obstruktiver Azoospermie." Aktuelle Urologie 37, no. 2 (March 2006): 132–37. http://dx.doi.org/10.1055/s-2005-915619.

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9

Ludewig, TH, and G. Gutte. "Histomorphometrische und histologische Untersuchungen zur morphokinetischen Wirkung von Furazolidon auf die Spermiogenese geschlechtsreifer Ratten." Anatomia, Histologia, Embryologia: Journal of Veterinary Medicine Series C 24, no. 1 (March 1995): 7–12. http://dx.doi.org/10.1111/j.1439-0264.1995.tb00002.x.

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10

Pollheide, Wilhelm. "Studien über die Beeinflussungsmöglichkeiten der Spermiogenese durch Substanzen, welche über das vegetativ-nervöse System wirken1." Zeitschrift für Tierzüchtung und Züchtungsbiologie 71, no. 3 (April 26, 2010): 193–216. http://dx.doi.org/10.1111/j.1439-0388.1958.tb01060.x.

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11

Chauvière, M., A. Martinage, P. Sautière, and Ph Chevaillier. "LES PROTEINES NUCLEAIRES BASIQUES DE TRANSITION AU COURS DE LA SPERMIOGENESE DE LA ROUSSETTE, SCYLLIORHINUS CANICULUS." Reproduction Nutrition Développement 29, Suppl. 1 (1989): 21. http://dx.doi.org/10.1051/rnd:19890732.

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JUSTINE, JEAN-LOU, and XAVIER MATTEI. "Ultrastructure de la spermiogenese et du spermatozoide de Loimosina wikoni et affinites phyletiques des Loimoidae (Plathelminthes, Monogenea, Monopisthocotylea)." Zoologica Scripta 14, no. 3 (July 1985): 169–75. http://dx.doi.org/10.1111/j.1463-6409.1985.tb00187.x.

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13

NOURY-SRAIRI, NEZHA, JEAN-LOU JUSTINE, and LOUIS EUZET. "Ultrastructure comparee de la spermiogenese et du spermatozoide de trois especes de Paravortex (Rhabdocoela, "Dalyellioida", Graffillidae), Turbellaries parasites intestinaux de Mollusques." Zoologica Scripta 18, no. 2 (April 1989): 161–74. http://dx.doi.org/10.1111/j.1463-6409.1989.tb00442.x.

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14

Fabian, Lacramioara, and Julie A. Brill. "Drosophila spermiogenesis." Spermatogenesis 2, no. 3 (July 2012): 197–212. http://dx.doi.org/10.4161/spmg.21798.

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15

Gao, Xinming, Binbin Feng, Daojun Tang, Chen Du, Congcong Hou, Shan Jin, and Junquan Zhu. "Mitochondrial Features and Expressions of MFN2 and DRP1 during Spermiogenesis in Phascolosoma esculenta." International Journal of Molecular Sciences 23, no. 24 (December 8, 2022): 15517. http://dx.doi.org/10.3390/ijms232415517.

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Mitochondria can fuse or divide, a phenomenon known as mitochondrial dynamics, and their distribution within a cell changes according to the physiological status of the cell. However, the functions of mitochondrial dynamics during spermatogenesis in animals other than mammals and fruit flies are poorly understood. In this study, we analyzed mitochondrial distribution and morphology during spermiogenesis in Sipuncula (Phascolosoma esculenta) and investigated the expression dynamics of mitochondrial fusion-related protein MFN2 and fission-related protein DRP1 during spermiogenesis. The mitochondria, which were elliptic with abundant lamellar cristae, were mainly localized near the nucleus and distributed unilaterally in cells during most stages of spermiogenesis. Their major axis length, average diameter, cross-sectional area, and volume are significantly changed during spermiogenesis. mfn2 and drp1 mRNA and proteins were most highly expressed in coelomic fluid, a spermatid development site for male P. esculenta, and highly expressed in the breeding stage compared to in the non-breeding stage. MFN2 and DRP1 expression levels were higher in components with many spermatids than in spermatid-free components. Immunofluorescence revealed that MFN2 and DRP1 were consistently expressed and that MFN2 co-localizes with mitochondria during spermiogenesis. The results provide evidence for an important role of mitochondrial dynamics during spermiogenesis from morphology and molecular biology in P. esculenta, broadening insights into the role of mitochondrial dynamics in animal spermiogenesis.

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Kwiatkowska, Maria, Andrzej Kaźmierczak, and Katarzyna Popłońska. "Ultrastructural, autoradiographic and electrophoretic examinations of Chara tomentosa spermiogenesis." Acta Societatis Botanicorum Poloniae 71, no. 3 (2014): 201–9. http://dx.doi.org/10.5586/asbp.2002.024.

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Ultrastructure of a spermatid nucleus changes many times during spermiogenesis. Condensed chromatin forms irregular clusters during phases I-II, a continuous ring adjacent to a nuclear envelope during phases III-V and a network occupying the whole nucleus during phase VI. In advanced spermiogenesis dense chromatin disappears and short randomly positioned fibrils arise, then long parallel ones are found (phase VIII) which during phase IX form a lamellar structure. In mature spermatozoids (phase X) chromatin becomes extremely condensed. 3H-arginine and 3H-lysine incorporation into spermatids during 2-min incubation is intensive during phases IN, decreases during phases VI, VII and becomes very low during phases VIII-IX. Capillary electrophoresis has shown that during Chara tomentosa spermiogenesis replacement of histones with basic proteins whose mobility is comparable to that of salmon protamines takes place. At the beginning of spermiogenesis core and linker histones are found in spermatids. During early spermiogenesis protamine-like proteins appear and their amount increases in late spermiogenesis when core histones are still present. In mature spermatozoids only protamine-like proteins represented by 3 fractions: 9.1 kDa, 9.6 kDa, 11.2 kDa are found. Disappearance of linker histones following their modification precedes disappearance of core histones. The results indicate that dynamic rearrangement of chromatin ultrastructure and aminoacid incorporation rate during spermiogenesis are reflected in basic nuclear protein changes.

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17

Aire, Tom A. "Spermiogenesis in birds." Spermatogenesis 4, no. 3 (May 4, 2014): e959392. http://dx.doi.org/10.4161/21565554.2014.959392.

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Aire, Tom A. "Spermiogenesis in Birds." Spermatogenesis 4, no. 1 (January 1, 2014): e34346. http://dx.doi.org/10.4161/spmg.34346.

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19

Courtens, J. L., and A. Depeiges. "Spermiogenesis ofLacerta vivipara." Journal of Ultrastructure Research 90, no. 2 (February 1985): 203–20. http://dx.doi.org/10.1016/0889-1605(85)90110-7.

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20

SHIGEKAWA, KATHERINE, and WALLIS H. CLARK. "Spermiogenesis in the Marine Shrimp, Sicyonia ingentis. (penaeidae/sperm/spermiogenesis)." Development, Growth and Differentiation 28, no. 2 (April 1986): 95–112. http://dx.doi.org/10.1111/j.1440-169x.1986.00095.x.

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21

Li, Xin, Chenying Duan, Ruyi Li, and Dong Wang. "Insights into the Mechanism of Bovine Spermiogenesis Based on Comparative Transcriptomic Studies." Animals 11, no. 1 (January 5, 2021): 80. http://dx.doi.org/10.3390/ani11010080.

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To reduce subfertility caused by low semen quality and provide theoretical guidance for the eradication of human male infertility, we sequenced the bovine transcriptomes of round, elongated spermatids and epididymal sperms. The differential analysis was carried out with the reference of the mouse transcriptome, and the homology trends of gene expression to the mouse were also analysed. First, to explore the physiological mechanism of spermiogenesis that profoundly affects semen quality, homological trends of differential genes were compared during spermiogenesis in dairy cattle and mice. Next, Gene Ontology (GO), Kyoto Encyclopaedia of Genes and Genomes (KEGG) pathway enrichment, protein–protein interaction network (PPI network), and bioinformatics analyses were performed to uncover the regulation network of acrosome formation during the transition from round to elongated spermatids. In addition, processes that regulate gene expression during spermiogenesis from elongated spermatid to epididymal sperm, such as ubiquitination, acetylation, deacetylation, and glycosylation, and the functional ART3 gene may play important roles during spermiogenesis. Therefore, its localisation in the seminiferous tubules and epididymal sperm were investigated using immunofluorescent analysis, and its structure and function were also predicted. Our findings provide a deeper understanding of the process of spermiogenesis, which involves acrosome formation, histone replacement, and the fine regulation of gene expression.

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22

Haseeb, Abdul, Hong Chen, Yufei Huang, Ping Yang, Xuejing Sun, Adeela Iqbal, Nisar Ahmed, et al. "Remodelling of mitochondria during spermiogenesis of Chinese soft-shelled turtle (Pelodiscus sinensis)." Reproduction, Fertility and Development 30, no. 11 (2018): 1514. http://dx.doi.org/10.1071/rd18010.

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Mitochondria are vital cellular organelles that have the ability to change their shape under different conditions, such as in response to stress, disease, changes in metabolic rate, energy requirements and apoptosis. In the present study, we observed remodelling of mitochondria during spermiogenesis and its relationship with mitochondria-associated granules (MAG). At the beginning of spermiogenesis, mitochondria are characterised by their round shape. As spermiogenesis progresses, the round-shaped mitochondria change into elongated and then swollen mitochondria, subsequently forming a crescent-like shape and finally developing into onion-like shaped mitochondria. We also noted changes in mitochondrial size, location and patterns of cristae at different stages of spermiogenesis. Significant differences (P < 0.0001) were found in the size of the different-shaped mitochondria. In early spermatids transitioning to the granular nucleus stage, the size of the mitochondria decreased, but increased subsequently during spermiogenesis. Changes in size and morphological variations were achieved through marked mitochondrial fusion. We also observed a non-membranous structure (MAG) closely associated with mitochondria that may stimulate or control fusion during mitochondrial remodelling. The end product of this sophisticated remodelling process in turtle spermatozoa is an onion-like mitochondrion. The acquisition of this kind of mitochondrial configuration is one strategy for long-term sperm storage in turtles.

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Santana, Júlio César de O., André L. Netto-Ferreira, Daniela Calcagnotto, and Irani Quagio-Grassiotto. "Sperm characteristics as additional evidence of close relationship between Lebiasina and Piabucina (Characiformes: Lebiasinidae: Lebiasininae)." Neotropical Ichthyology 11, no. 3 (September 2013): 573–79. http://dx.doi.org/10.1590/s1679-62252013000300010.

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Spermiogenesis and spermatozoa of representatives of the genera Lebiasina and Piabucinaare described. Spermiogenesis is quite similar among all analyzed species of these genera and is identified as Type II. In this type of spermiogenesis, the flagellum of earliest spermatids lies lateral to the nucleus. A slight movement of the nucleus towards the centriolar complex is observed. In late spermatids, the nucleus slightly elongates towards the flagellum. The formation of two striated rootlets apparently occurs in early/intermediate spermatids. The spermatozoa of species of Lebiasinaand Piabucina share (1) a drop-shaped slightly elongated nucleus that is laterally positioned relative to the flagellum; (2) a superolateral centriolar complex; (3) two striated rootlets; (4) a basolateral midpiece; (5) oblong mitochondria and (6) a few spherical vesicles. The spermatic characteristics of Lebiasinaand Piabucinaindicate that spermiogenesis is a homologous process among all species of both genera examined to date and can be considered, along with the spermatozoa morphology, additional evidence indicating a close relationship between Lebiasina and Piabucina.

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Antonio, Carmen, Jose M. Gonzalez-Garcia, and Jose A. Suja. "Pycnotic cycle of the sex chromosome of Pyrgomorpha conica (Orthoptera) and development of spermiogenesis." Genome 36, no. 3 (June 1, 1993): 535–41. http://dx.doi.org/10.1139/g93-073.

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We have analyzed the anomalous pycnotic cycle of the X sex chromosome of the grasshopper Pyrgomorpha conica throughout both meiotic divisions and its possible influence on spermiogenesis. During diplotene the sex chromosome shows two differentiated pycnotic regions: (i) the centromeric region, which is negatively heteropycnotic, and (ii) the noncentromeric region, which shows alternating negatively and positively heteropycnotic zones in all standard individuals. The variation in size and location of the negative heteropycnotic zones, their smooth appearance, and their lack of effect on spermiogenesis lead us to suggest that condensation differences and not euchromatinization are responsible for their presence. In two individuals the sex chromosome appeared partially isopycnotic at metaphase I, and high levels of abnormal spermatids (macrospermatids and microspermatids) were found. We suggest that the possible activity of this chromosome during the second meiotic division may promote the disruption of spermiogenesis by affecting the mechanism that maintains intercellular bridges between normal spermatids.Key words: sex chromosome, heterochromatin, heteropycnosis, meiosis, spermiogenesis.

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25

Colli, Guarino, Gustavo H. C. Vieira, Sônia Báo, and Helga Wiederhecker. "Spermiogenesis and testicular cycle of the lizard Tropidurus torquatus (Squamata, Tropiduridae) in the Cerrado of central Brazil." Amphibia-Reptilia 22, no. 2 (2001): 217–33. http://dx.doi.org/10.1163/15685380152030445.

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AbstractWe studied the spermiogenesis and testicular cycle of the lizard Tropidurus torquatus, using light and electron microscopy. Males bearing spermatozoa were present practically year-round and spermatogenic activity showed a regenerative phase from late dry season to the end of the rainy season (July to March), with low frequency of initial stages of the spermatogenic cycle, and a brief degenerative phase from April to June, lacking the total regression of seminiferous tubules. These characteristics resemble those from species with continuous reproductive cycles, contrasting with the strongly seasonal reproductive cycle of females. Spermiogenesis includes nuclear elongation, chromatin condensation, acrosomal and flagellar development, and elimination of excessive cytoplasm. We describe some new aspects in the spermiogenesis of T. torquatus, including the interaction between spermatid and Sertoli cell, acrosomal granule, subacrosomal granule, and the fibrous sheath formation. The testicular cycle of T. torquatus is very similar to that of other lizards that inhabit seasonal environments, and its spermiogenesis and ultrastructure of mature sperm display a number of conservative features.

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Pan, Yue, Jingqian Wang, Xinming Gao, Chen Du, Congcong Hou, Daojun Tang, and Junquan Zhu. "Expression Dynamics Indicate Potential Roles of KIF17 for Nuclear Reshaping and Tail Formation during Spermiogenesis in Phascolosoma esculenta." International Journal of Molecular Sciences 25, no. 1 (December 21, 2023): 128. http://dx.doi.org/10.3390/ijms25010128.

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Kinesin family member17 (KIF17), a homologous dimer of the kinesin-2 protein family, has important microtubule-dependent and -independent roles in spermiogenesis. Little is known about KIF17 in the mollusk, Phascolosoma esculenta, a newly developed mariculture species in China. Here, we cloned the open reading frame of Pe-kif17 and its related gene, Pe-act, and performed bioinformatics analysis on both. Pe-KIF17 and Pe-ACT are structurally conserved, indicating that they may be functionally conserved. The expression pattern of kif17/act mRNA performed during spermiogenesis revealed their expression in diverse tissues, with the highest expression level in the coelomic fluid of P. esculenta. The expressions of Pe-kif17 and Pe-act mRNA were relatively high during the breeding season (July–September), suggesting that Pe-KIF17/ACT may be involved in spermatogenesis, particularly during spermiogenesis. Further analysis of Pe-kif17 mRNA via fluorescence in situ hybridization revealed the continuous expression of this mRNA during spermiogenesis, suggesting potential functions in this process. Immunofluorescence showed that Pe-KIF17 co-localized with α-tubulin and migrated from the perinuclear cytoplasm to one side of the spermatid, forming the sperm tail. Pe-KIF17 and Pe-ACT also colocalized. KIF17 may participate in spermiogenesis of P. esculenta, particularly in nuclear reshaping and tail formation by interacting with microtubule structures similar to the manchette. Moreover, Pe-KIF17 with Pe-ACT is also involved in nuclear reshaping and tail formation in the absence of microtubules. This study provides evidence for the role of KIF17 during spermiogenesis and provides theoretical data for studies of the reproductive biology of P. esculenta. These findings are important for spermatogenesis in mollusks.

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Wang, Jingqian, Xinming Gao, Chen Du, Daojun Tang, Congcong Hou, and Junquan Zhu. "The Effect of Prohibitins on Mitochondrial Function during Octopus tankahkeei Spermiogenesis." International Journal of Molecular Sciences 24, no. 12 (June 12, 2023): 10030. http://dx.doi.org/10.3390/ijms241210030.

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Mitochondria are essential for spermiogenesis. Prohibitins (PHBs; prohibitin 1, PHB1 or PHB, and prohibitin 2, PHB2) are evolutionarily conserved and ubiquitously expressed mitochondrial proteins that act as scaffolds in the inner mitochondrial membrane. In this study, we analyzed the molecular structure and dynamic expression characteristics of Ot-PHBs, observed the colocalization of Ot-PHB1 with mitochondria and polyubiquitin, and studied the effect of phb1 knockdown on mitochondrial DNA (mtDNA) content, reactive oxygen species (ROS) levels, and apoptosis-related gene expression in spermatids. Our aim was to explore the effect of Ot-PHBs on mitochondrial function during the spermiogenesis of Octopus tankahkeei (O. tankahkeei), an economically important species in China. The predicted Ot-PHB1/PHB2 proteins contained an N-terminal transmembrane, a stomatin/prohibitin/flotillin/HflK/C (SPFH) domain (also known as the prohibitin domain), and a C-terminal coiled-coil domain. Ot-phb1/phb2 mRNA were widely expressed in the different tissues, with elevated expression in the testis. Further, Ot-PHB1 and Ot-PHB2 were highly colocalized, suggesting that they may function primarily as an Ot-PHB compiex in O. tankahkeei. Ot-PHB1 proteins were mainly expressed and localized in mitochondria during spermiogenesis, implying that their function may be localized to the mitochondria. In addition, Ot-PHB1 was colocalized with polyubiquitin during spermiogenesis, suggesting that it may be a polyubiquitin substrate that regulates mitochondrial ubiquitination during spermiogenesis to ensure mitochondrial quality. To further investigate the effect of Ot-PHBs on mitochondrial function, we knocked down Ot-phb1 and observed a decrease in mtDNA content, along with increases in ROS levels and the expressions of mitochondria-induced apoptosis-related genes bax, bcl2, and caspase-3 mRNA. These findings indicate that PHBs might influence mitochondrial function by maintaining mtDNA content and stabilizing ROS levels; in addition, PHBs might affect spermatocyte survival by regulating mitochondria-induced apoptosis during spermiogenesis in O. tankahkeei.

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Quagio-Grassiotto, Irani, Maria Angélica Spadella, Márcio de Carvalho, and Claudio Oliveira. "Comparative description and discussion of spermiogenesis and spermatozoal ultrastructure in some species of Heptapteridae and Pseudopimelodidae (Teleostei: Siluriformes)." Neotropical Ichthyology 3, no. 3 (September 2005): 401–10. http://dx.doi.org/10.1590/s1679-62252005000300008.

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The data obtained in the present study on spermiogenesis and spermatozoal ultrastructure of Pseudopimelodidae and Heptapteridae show that they share some characteristics, but greatly differ from each other. The main differences are the occurrence of type I spermiogenesis in Pseudopimelodidae and type III in Heptapteridae, the presence of nuclear fossa in Pseudopimelodidae and its absence in Heptapteridae, the presence of long midpiece in Pseudopimelodidae and short midpiece in Heptapteridae, the presence of cytoplasmic canal in Pseudopimelodidae and its absence in Heptapteridae, the presence of many large vesicles in the midpiece of Pseudopimelodidae and the presence of very long vesicles placed in the peripheral distal region in Heptapteridae, and mitochondria distributed all over the midpiece in Pseudopimelodidae, and very close to the nucleus in Heptapteridae. Heptapteridae and Pimelodidae share several characteristics, such as type III spermiogenesis, a similar chromatin condensation pattern, and the absence of nuclear fossa and flagellar lateral fins. The spermatozoa of Pseudopimelodidae is more similar to those of Siluridae. However, the absence of additional data on spermiogenesis and spermatozoa in siluriforms still limits a broader discussion in the order.

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Spadella, Maria A., Claudio Oliveira, and Irani Quagio-Grassiotto. "Comparative analysis of spermiogenesis and sperm ultrastructure in Callichthyidae (Teleostei: Ostariophysi: Siluriformes)." Neotropical Ichthyology 5, no. 3 (September 2007): 337–50. http://dx.doi.org/10.1590/s1679-62252007000300014.

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In Corydoradinae, the presence of spermatids in the lumen of the testicular tubules together with spermatozoa suggests that spermatogenesis is of the semicystic type, whereas in Callichthyinae, sperm production occurs entirely within spermatocysts in the germinal epithelium, characterizing cystic spermatogenesis. Spermiogenesis in Callichthyinae is characterized by an initial lateral development of the flagellum, the presence of nuclear rotation to different degrees, an eccentric or medial formation of a nuclear fossa, formation of a cytoplasmic channel, and presence of centriolar migration, being more similar to type I spermiogenesis. In Corydoradinae, spermiogenesis is characterized by eccentric development of the flagellum, the absence of nuclear rotation, an eccentric nuclear fossa formation, formation of a cytoplasmic channel, and absence of centriolar migration, differing from the types previously described. The process of spermatogenesis and spermiogenesis in Corydoradinae and Callichthyinae revealed unique characters for each of these subfamilies, corroborating the hypotheses that they constitute monophyletic groups. In relation to sperm ultrastructure, the comparative analysis of the callichthyid species shows that the general characteristics found in the spermatozoa were similar, thus, reinforcing the hypothesis that the family is monophyletic.

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30

Jones, P. R., and R. D. Butler. "Spermiogenesis in Platichthys flesus." Journal of Ultrastructure and Molecular Structure Research 98, no. 1 (January 1988): 83–93. http://dx.doi.org/10.1016/s0889-1605(88)80936-4.

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31

Rathke, Christina, Willy M. Baarends, Stephan Awe, and Renate Renkawitz-Pohl. "Chromatin dynamics during spermiogenesis." Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms 1839, no. 3 (March 2014): 155–68. http://dx.doi.org/10.1016/j.bbagrm.2013.08.004.

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32

Tanaka, H., and T. Baba. "Gene expression in spermiogenesis." CMLS Cellular and Molecular Life Sciences 62, no. 3 (February 2005): 344–54. http://dx.doi.org/10.1007/s00018-004-4394-y.

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33

Buckland-Nicks, John, and Fu-Shiang Chia. "Spermiogenesis inChaetoderma sp. (Aplacophora)." Journal of Experimental Zoology 252, no. 3 (December 1989): 308–17. http://dx.doi.org/10.1002/jez.1402520314.

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34

Sassone-Corsi, P., and G. Schutz. "Le gène Crem et la spermiogenèse." Biofutur 1996, no. 156 (May 1996): 12. http://dx.doi.org/10.1016/0294-3506(96)85250-1.

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35

Wang, Shuo-Yue, Qiu-Meng Xiang, Jun-Quan Zhu, Chang-Kao Mu, Chun-Lin Wang, and Cong-Cong Hou. "The Functions of Pt-DIC and Pt-Lamin B in Spermatogenesis of Portunus trituberculatus." International Journal of Molecular Sciences 25, no. 1 (December 21, 2023): 112. http://dx.doi.org/10.3390/ijms25010112.

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Cytoplasmic Dynein is a multiple-subunit macromolecular motor protein involved in the transport process of cells. The Dynein intermediate chain (DIC) is one of the subunits of Dynein-1. In our previous studies, we showed that Pt-DIC may play an important role in the nuclear deformation of spermiogenesis in Portunus trituberculatus. Lamin B is essential for maintaining nuclear structure and functions. Surprisingly, Pt-Lamin B was expressed not only in the perinucleus but also in the pro-acrosome during spermiogenesis in P. trituberculatus. Studies have also shown that Dynein-1 can mediate the transport of Lamin B in mammals. Thus, to study the relationship of Pt-DIC and Pt-Lamin B in the spermatogenesis of P. trituberculatus, we knocked down the Pt-DIC gene in P. trituberculatus by RNAi. The results showed that the distribution of Pt-DIC and Pt-Lamin B in spermiogenesis was abnormal, and the colocalization was weakened. Moreover, we verified the interaction of Pt-DIC and Pt-Lamin B via coimmunoprecipitation. Therefore, our results suggested that both Pt-DIC and Pt-Lamin B were involved in the spermatogenesis of P. trituberculatus, and one of the functions of Dynein-1 is to mediate the transport of Lamin B in the spermiogenesis of P. trituberculatus.

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Ashour, A. A., K. Garo, and I. S. Gamil. "Spermiogenesis in two paramphistomes from Nile fish in Egypt: an ultrastructural study." Journal of Helminthology 81, no. 3 (September 2007): 219–26. http://dx.doi.org/10.1017/s0022149x07409816.

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AbstractThe process of spermiogenesis in two paramphistomes,Sandonia sudanensisandBasidiodiscus ectorchisfrom the Nile fishSynodontis schallin Egypt was studied by transmission electron microscopy. Spermiogenesis is characterized by the outgrowth of the zone of differentiation, presenting two basal bodies separated by a microtubule organizing centre, each basal body developing into a flagellum. Proximodistal fusion of these flagella with a median cytoplasmic extension gives rise to the spermatozoon. The mature spermatozoon possesses two axonemes of the 9+‘1’ pattern typical of parasitic helminths. There are few ultrastructural studies on spermiogenesis in paramphistomes, which are considered the most primitive digenetic trematodes. The present study provides new and more detailed information on this process, including the presence of a lateral flange and external ornamentation of the cell membrane. The value of sperm ultrastructure as a taxonomic tool in phylogeny is also discussed.

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Klink, Vincent P., and Stephen M. Wolniak. "Centrin Is Necessary for the Formation of the Motile Apparatus in Spermatids of Marsilea." Molecular Biology of the Cell 12, no. 3 (March 2001): 761–76. http://dx.doi.org/10.1091/mbc.12.3.761.

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During spermiogenesis in the water fern, Marsilea vestita, basal bodies are synthesized de novo in cells that lack preexisting centrioles, in a particle known as a blepharoplast. We have focused on basal body assembly in this organism, asking what components are required for blepharoplast formation. Spermiogenesis is a rapid process that is activated by placing dry microspores into water. Dry microspores contain large quantities of stored protein and stored mRNA, and inhibitors reveal that certain proteins are translated from stored transcripts at specific times during development. Centrin translation accompanies blepharoplast appearance, while β-tubulin translation occurs later, during axonemal formation. In asking whether centrin is an essential component of the blepharoplast, we used antisense, sense, and double-stranded RNA probes made from theMarsilea centrin cDNA, MvCen1, to block centrin translation. We employed a novel method to introduce these RNAs directly into the cells. Antisense and sense both arrest spermiogenesis when blepharoplasts should appear, and dsRNA made from the same cDNA is an effective inhibitor at concentrations at least 10 times lower than either of the single-stranded RNA used in these experiments. Blepharoplasts are undetectable and basal bodies fail to form. Antisense, sense, and dsRNA probes made from Marsileaβ-tubulin permitted normal development until axonemes form. In controls, antisense, sense, and dsRNA, made from a segment of HIV, had no effect on spermiogenesis. Immunoblots suggest that translational blocks induced by centrin-based RNA are gene specific and concentration dependent, since neither β-tubulin- nor HIV-derived RNAs affects centrin translation. The disruption of centrin translation affects microtubule distributions in spermatids, since centrin appears to control formation of the cytoskeleton and motile apparatus. These results show that centrin plays an essential role in the formation of a motile apparatus during spermiogenesis of M. vestita.

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Augière, Céline, Jean-André Lapart, Jean-Luc Duteyrat, Elisabeth Cortier, Charline Maire, Joëlle Thomas, and Bénédicte Durand. "salto/CG13164is required for sperm head morphogenesis inDrosophila." Molecular Biology of the Cell 30, no. 5 (March 2019): 636–45. http://dx.doi.org/10.1091/mbc.e18-07-0429.

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Producing mature spermatozoa is essential for sexual reproduction in metazoans. Spermiogenesis involves dramatic cell morphological changes going from sperm tail elongation and nuclear reshaping to cell membrane remodeling during sperm individualization and release. The sperm manchette plays a critical scaffolding function during nuclear remodeling by linking the nuclear lamina to the cytoskeleton. Here, we describe the role of an uncharacterized protein in Drosophila, salto/CG13164, involved in nuclear shaping and spermatid individualization. Salto has dynamic localization during spermatid differentiation, being progressively relocated from the sperm-nuclear dense body, which is equivalent to the mammalian sperm manchette, to the centriolar adjunct and acrosomal cap during spermiogenesis. salto-null male flies are sterile and exhibit complete spermatid individualization defects. salto-deficient spermatids show coiled spermatid nuclei at late maturation stages and stalled individualization complexes. Our work sheds light on a novel component involved in cytoskeleton-based cell-morphological changes during spermiogenesis.

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Suja, J. A., C. García de la Vega, and J. S. Rufas. "Mechanisms promoting the appearance of abnormal spermatids in B-carrier individuals of Eyprepocnemis plorans (Orthoptera)." Genome 32, no. 1 (February 1, 1989): 64–71. http://dx.doi.org/10.1139/g89-412.

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Males of Eyprepocnemis plorans that carry B chromosomes have been analysed to test for the presence of aberrant spermatids. The study of the behaviour of the B chromosomes throughout meiosis provides some clues for the appearance of some kinds of abnormal spermatids. However, most of these spermatids are assumed to result from the impairment of the maintenance of intercellular bridges early in spermiogenesis. A model to explain these results is presented.Key words: B chromosomes, spermiogenesis, insect spermatogenesis.

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Huang, Chao, Huan Gong, Bin Mu, Xinting Lan, Chengcheng Yang, Jinlong Tan, Wentao Liu, et al. "BAF-L Modulates Histone-to-Protamine Transition during Spermiogenesis." International Journal of Molecular Sciences 23, no. 4 (February 11, 2022): 1985. http://dx.doi.org/10.3390/ijms23041985.

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Maturing male germ cells undergo a unique developmental process in spermiogenesis that replaces nucleosomal histones with protamines, the process of which is critical for testicular development and male fertility. The progress of this exchange is regulated by complex mechanisms that are not well understood. Now, with mouse genetic models, we show that barrier-to-autointegration factor-like protein (BAF-L) plays an important role in spermiogenesis and spermatozoal function. BAF-L is a male germ cell marker, whose expression is highly associated with the maturation of male germ cells. The genetic deletion of BAF-L in mice impairs the progress of spermiogenesis and thus male fertility. This effect on male fertility is a consequence of the disturbed homeostasis of histones and protamines in maturing male germ cells, in which the interactions between BAF-L and histones/protamines are implicated. Finally, we show that reduced testicular expression of BAF-L represents a risk factor of human male infertility.

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Santana, Júlio César de O., Daniela Calcagnotto, and Irani Quagio-Grassiotto. "Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes)." Neotropical Ichthyology 12, no. 2 (June 2014): 419–27. http://dx.doi.org/10.1590/1982-0224-20130177.

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Spermiogenesis and spermatozoa in six genera of the African family Alestidae plus the Neotropical genus Chalceusare described. Spermiogenesis is quite similar in all Alestidae and is identified as Type I and its variants. In Type I spermiogenesis, the flagellum of earliest spermatids lies lateral to the nucleus, and rotation of the nucleus towards the centriolar complex is observed. Nuclear rotation is complete reaching 90 degrees in Bryconalestes longipinnis, Brachypetersius altus, Brycinus imberi, B. lateralis, and Alestopetersius compressus; and is incomplete reaching 20 degrees in Micralestes acutidensand Rhabdalestesrhodesiensis. Spermatozoa morphology varies from a medial nucleus with fibrillar chromatin in the most basal genus Brycinusto a strongly eccentric nucleus with highly condensed chromatin in the more derived Rhabdalestesand Micralestes. Chalceushas a very similar spermatozoon to that found in Brycinussharing the fibrillar aspect of the chromatin in the nucleus. This feature is so far only observed in these two genera among African and Neotropical characiform fishes.

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Mattei, Xavier, and Bernard Marchand. "La spermiogenèse de Myzostomum sp. (Procoelomata, Myzostomida)." Journal of Ultrastructure and Molecular Structure Research 100, no. 1 (July 1988): 75–85. http://dx.doi.org/10.1016/0889-1605(88)90060-2.

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Cheng, C. Yan, and Dolores D. Mruk. "Actin binding proteins and spermiogenesis." Spermatogenesis 1, no. 2 (April 2011): 99–104. http://dx.doi.org/10.4161/spmg.1.2.16913.

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Iomini, Carlo, Marco Ferraguti, Giulio Melone, and Jean-Lou Justine. "Spermiogenesis in a Scutariellid (Platyhelminthes)." Acta Zoologica 75, no. 4 (October 1994): 287–95. http://dx.doi.org/10.1111/j.1463-6395.1994.tb00965.x.

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Wouters-Tyrou, D., A. Martinage, P. Chevaillier, and P. Sautière. "Nuclear basic proteins in spermiogenesis." Biochimie 80, no. 2 (February 1998): 117–28. http://dx.doi.org/10.1016/s0300-9084(98)80018-7.

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Manandhar, G., P. Sutovsky, H. C. Joshi, T. Stearns, and G. Schatten. "Centrosome Reduction during Mouse Spermiogenesis." Developmental Biology 203, no. 2 (November 1998): 424–34. http://dx.doi.org/10.1006/dbio.1998.8947.

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Werner, G., and S. R. Bawa. "Membranous tubes in pseudoscorpion spermiogenesis." Tissue and Cell 21, no. 1 (January 1989): 153–56. http://dx.doi.org/10.1016/0040-8166(89)90029-3.

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ROUSSEAUXPREVOST, R., D. WOUTERSTYROU, P. SAUTIERE, and J. ROUSSEAUX. "Chromatin reorganization in cuttlefish spermiogenesis." Cell Biology International Reports 14 (September 1990): 166. http://dx.doi.org/10.1016/0309-1651(90)90764-p.

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Fraile, Benito, Marina C. Rodriguez, Ricardo Paniagua, and Francisco J. Saez. "Effects of moderately high temperature on the testis of the marbled newt, Triturus marmoratus." Amphibia-Reptilia 10, no. 2 (1989): 117–24. http://dx.doi.org/10.1163/156853889x00151.

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AbstractIn order to investigate the effects of a moderately high temperature on testicular function in urodele amphibians, marbled newts (Triturus marmoratus) wcrc collected from thc field and killed at the end of each period of their spermategenetic cyle; these were: germ cell proliferation up to round spermatids (June), spermiogenesis (September), and the early (December) and late (March) periods of testicular quiescence. The testes of these animals were studied by light microscopy and compared with those of newts which were killed at the same dates and had been exposed previously to moderately high temperatures (30°C) for 1 or 3 months. The results of quantitative studies indicatc that: (1) exposure to high temperatures (for 3 months but not for 1 month) induces germ cell development up to round spermatids during the early phase of testicular quiescence; (2) this temperature has no effect in the period of germ cell proliferation up to round spermatids; and (3) high temperatures inhibit (exposure for 3 months) or decrease (exposure for I month) spermiogenesis during the spermiogenesis period.

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ISAHAKIA, MOHAMED A. "Stage‐specific Expression of a Protein of the Acrosome of Baboon Sperm during Spermiogenesis Detected with a Monoclonal Antibody." Journal of Andrology 12, no. 2 (March 4, 1991): 140–47. http://dx.doi.org/10.1002/j.1939-4640.1991.tb00234.x.

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ABSTRACT: A single monoclonal antibody, BSA4, raised against baboon epididymal sperm was used to study the ontogeny of the baboon sperm acrosome region during testicular spermiogenesis. This antibody is not species‐specific but is restricted to the acrosome region in all other sperm examined (human, rat, and mouse). In the baboon, treatment of epididymal sperm with 0.05% Triton‐X results in complete loss of anterior acrosome staining. Such treated sperm display a distinct equatorial staining. Antibody BSA4 reacts with a determinant (molecular weight, 43,000 d) that first appears in postmeiotic round spermatids during spermiogenesis. When tested for an effect on the fertilization process in vitro, the antibody BSA4 displayed significant inhibition, indicating a possible functional role for the determinant on mouse sperm. Using the avidin‐biotin immunoperoxidase method, several stages of acrosome development were recognized: ie, cap, acrosome, and maturation stages of spermiogenesis. The antibody staining was restricted to the developing acrosome at all stages, indicating that the equatorial region is part of the acrosome and is expressed with temporal specificity during spermatogenesis in the baboon.

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Journal articles on the topic 'Spermiogenese'

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