Results 41 to 50 of about 22,975 (207)

The ubiquitin-conjugating enzyme HR6B is required for maintenance of X chromosome silencing in mouse spermatocytes and spermatids

BMC Genomics, 2010
Background The ubiquitin-conjugating enzyme HR6B is required for spermatogenesis in mouse. Loss of HR6B results in aberrant histone modification patterns on the trancriptionally silenced X and Y chromosomes (XY body) and on centromeric chromatin in ...
van IJcken Wilfred FJ, Sun Zu-Wen, Ooms Marja, Sleddens-Linkels Esther, Hoogerbrugge Jos W, Wassenaar Evelyne, Mulugeta Achame Eskeatnaf, Grootegoed J Anton, Baarends Willy M   +8 more
doaj   +1 more source

Identification of genetic networks that act in the somatic cells of the testis to mediate the developmental program of spermatogenesis. [PDF]

PLoS Genetics, 2017
Spermatogenesis is a dynamic developmental process requiring precisely timed transitions between discrete stages. Specifically, the germline undergoes three transitions: from mitotic spermatogonia to spermatocytes, from meiotic spermatocytes to ...
Michael John Fairchild, Fayeza Islam, Guy Tanentzapf   +2 more
doaj   +1 more source

Testis-Specific Bb8 Is Essential in the Development of Spermatid Mitochondria. [PDF]

PLoS ONE, 2016
Mitochondria are essential organelles of developing spermatids in Drosophila, which undergo dramatic changes in size and shape after meiotic division, where mitochondria localized in the cytoplasm, migrate near the nucleus, aggregate, fuse and create the
Viktor Vedelek, Barbara Laurinyecz, Attila L Kovács, Gábor Juhász, Rita Sinka   +4 more
doaj   +1 more source

PENURUNAN JUMLAH SPERMATOSIT PAKITEN DAN SPERMATID TUBULUS SEMINIFERUS TESTIS PADA MENCIT (MUS MUSCULUS) YANG DIPAPARKAN ASAP ROKOK

Jurnal Biologi Udayana, 2014
This study was conducted to observe the effect of cigarette smoke exposure on spermatogenesis of male mice. The animals used in this study were 63 male mice, aged 12 weeks. They were divided randomly into 3 groups, each group consisted of 21 mice.
A.A.Sg A. SUKMANINGSIH
doaj  

Testis size, peripheral concentrations of testosterone, semen criteria and Sertoli and germ cell numbers in Nelore bulls

Semina: Ciências Agrárias, 2014
A study was conducted to evaluate the associations among testis size, testosterone concentrations, semen parameters and aspects of spermatogenesis in Nelore bulls (n = 28). Testis size was measured from 10 to 29 months of age.
Erika Bezerra de Menezes, Claudia Roberta de Andrade, José Hyrton Carneiro-Júnior, Glaycione Costa Rodrigues , Raimundo Martins Filho , Airton Alencar de Araújo, Arlindo Alencar Araripe Moura   +6 more
doaj   +1 more source

A ubiquitin ligase complex regulates caspase activation during sperm differentiation in Drosophila. [PDF]

PLoS Biology, 2007
In both insects and mammals, spermatids eliminate their bulk cytoplasm as they undergo terminal differentiation. In Drosophila, this process of dramatic cellular remodeling requires apoptotic proteins, including caspases. To gain further insight into the
Eli Arama, Maya Bader, Gabrielle E Rieckhof, Hermann Steller   +3 more
doaj   +1 more source

Is there a future for spermatid injections? [PDF]

Human Reproduction, 1998
Microinjection of spermatids into oocytes has proven to be a successful assisted reproduction procedure in the animal model. In the human, low fertilization and cleavage to the 4-cell stage were reported after intracytoplasmic sperm injection (ICSI) with round spermatids.
P, Vanderzwalmen, M, Nijs, A, Stecher, H, Zech, G, Bertin, B, Lejeune, B, Vandamme, A, Chatziparasidou, Y, Prapas, R, Schoysman   +9 more
openaire   +2 more sources

Subcellular evidence for biogenesis of autophagosomal membrane during spermiogenesis in vivo

Frontiers in Physiology, 2016
Although autophagosome formation has attracted substantial attention, the origin and the source of the autophagosomal membrane remains unresolved.
Yufei Huang, Ping Yang, Tengfei Liu, Hong Chen, Xiaoya Chu, Nisar Ahmad, Qian Zhang, Quanfu Li, Lisi Hu, Yi Liu, Qiusheng Chen   +10 more
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Genetic Instability and Chromatin Remodeling in Spermatids

, 2019
The near complete replacement of somatic chromatin in spermatids is, perhaps, the most striking nuclear event known to the eukaryotic domain. The process is far from being fully understood, but research has nevertheless unraveled its complexity as an ...
Rebecka Desmarais, Guylain Boissonneault, Tiphanie Cavé, Chloé Lacombe-Burgoyne   +3 more
core   +1 more source

Development of a procedure for isolation, identification and quality assessment of bovine spermatids and evaluation of their fertilizing ability in vitro

Frontiers in Bioengineering and Biotechnology
Intracytoplasmic spermatid injection into oocytes has limited efficiency in cattle, with no offspring generated so far, partly due to ambiguous spermatid identification.
Rolando Pasquariello, Francesca Di Filippo, Sai Kamal Nag Bonumallu, Fernanda Fagali Franchi, Ramona Pistucci, Federica Franciosi, Valentina Lodde, Alessandra Iannuzzi, Alberto Maria Luciano, Tiziana A. L. Brevini, Fulvio Gandolfi   +10 more
doaj   +1 more source