Results 41 to 50 of about 67,099 (264)

Karyotype evolution in progress: A new diploid number in Belostoma candidulum (Heteroptera: Belostomatidae) from Argentina leading to new insights into its ecology and evolution [PDF]

, 2014
A novel chromosome complement (2n = 14 = 12 + XY/XX; male/female sex chromosomes), male meiosis behaviour, heterochromatin characterization, and frequency and distribution of chiasmata are described for the first time in specimens from a natural ...
Bressa, Maria Jose, Chirino, Monica Gabriela   +1 more
core   +1 more source

A surge of late-occurring meiotic double-strand breaks rescues synapsis abnormalities in spermatocytes of mice with hypomorphic expression of SPO11 [PDF]

, 2015
Meiosis is the biological process that, after a cycle of DNA replication, halves the cellular chromosome complement, leading to the formation of haploid gametes.
Barchi, Marco, DE ROOIJ, DIRK GIJSBERT, Di Cecca, Stefano, DI GIACOMO, Monica, DI SIENA, Sara, Faieta, Monica, Luchetti, Andrea, Murdocca, Michela, Pellegrini, Manuela, Rossi, Pellegrino   +9 more
core   +5 more sources

The Mammalian Spermatogenesis Single-Cell Transcriptome, from Spermatogonial Stem Cells to Spermatids

Cell Reports, 2018
Summary: Spermatogenesis is a complex and dynamic cellular differentiation process critical to male reproduction and sustained by spermatogonial stem cells (SSCs).
Brian P. Hermann, Keren Cheng, Anukriti Singh, Lorena Roa-De La Cruz, Kazadi N. Mutoji, I-Chung Chen, Heidi Gildersleeve, Jake D. Lehle, Max Mayo, Birgit Westernströer, Nathan C. Law, Melissa J. Oatley, Ellen K. Velte, Bryan A. Niedenberger, Danielle Fritze, Sherman Silber, Christopher B. Geyer, Jon M. Oatley, John R. McCarrey   +18 more
doaj   +1 more source

An orchestrated intron retention program in meiosis controls timely usage of transcripts during germ cell differentiation [PDF]

, 2017
Global transcriptome reprogramming during sper-matogenesis ensures timely expression of factors in each phase of male germ cell differentiation. Sper-matocytes and spermatids require particularly exten-sive reprogramming of gene expression to switch from
Alberdi, Antonio J., Bielli, Pamela, De la Grange, Pierre, DI PERSIO, Sara, Geremia, Raffaele, Jolly, Ariane, Naro, Chiara, Sette, Claudio, Setterblad, Niclas, Vicini, Elena   +9 more
core   +2 more sources

T-loop phosphorylation of Arabidopsis CDKA;1 is required for its function and can be partially substituted by an aspartate residue [PDF]

, 2007
As in other eukaryotes, progression through the cell cycle in plants is governed by cyclin-dependent kinases. Phosphorylation of a canonical Thr residue in the T-loop of the kinases is required for high enzyme activity in animals and yeast.
Dissmeyer, N., , Nowack, M., Pusch, S., Stals, H., Inzé, D., Grini, P., Schnittger, A.   +7 more
core   +2 more sources

Regulation of meiotic entry and gonadal sex differentiation in the human: normal and disrupted signaling

Biomolecular Concepts, 2014
Meiosis is a unique type of cell division that is performed only by germ cells to form haploid gametes. The switch from mitosis to meiosis exhibits a distinct sex-specific difference in timing, with female germ cells entering meiosis during fetal ...
Jørgensen Anne, Rajpert-De Meyts Ewa
doaj   +1 more source

Distinct dynein complexes defined by DYNLRB1 and DYNLRB2 regulate mitotic and male meiotic spindle bipolarity

Nature Communications, 2023
Male meiosis relies on canonical centrosomes for spindle formation, but how this differs from acentrosomal oocyte meiosis is unclear. Here they show that spindle formation in sperm relies on DYNLRB2, similar to the activity of DYNLRB1 in mitotic cells.
Shuwen He, John P. Gillies, Juliana L. Zang, Carmen M. Córdoba-Beldad, Io Yamamoto, Yasuhiro Fujiwara, Julie Grantham, Morgan E. DeSantis, Hiroki Shibuya   +8 more
doaj   +1 more source

OBSERVATIONS OF CENTRIOLE FORMATION IN MALE MEIOSIS [PDF]

The Journal of Cell Biology, 1972
Centriole formation in male meiosis of the hyrax, Heterohyrax syriacus, and the Berdmore palm squirrel, Memetes berdmorei, was investigated by serial section analysis of selected regions of the seminiferous epithelium and isolated meiotic cells. Two periods of centriole formation were observed, a first in cells in transition between zygotene and ...
openaire   +2 more sources

Errors in chromosome segregation during oogenesis and early embryogenesis [PDF]

, 2010
Errors in chromosome segregation occurring during human oogenesis and early embryogenesis are very common. Meiotic chromosome development during oogenesis is subdivided into three distinct phases.
A Dyban, A Kuliev, A Kuliev, A Mantzouratou, A Pujol, AL Barlow, C Gutierrez-Mateo, C Gutierrez-Mateo, C Staessen, C Tease, C Tease, C Tease, C Yuncken, CM Conn, CM Conn, D Wells, D Wells, E Bendsen, E Fragouli, E Fragouli, E Fragouli, E Fragouli, E Iwarsson, EY Cheng, F Pellestor, F Pellestor, G Sher, HE Hall, J Cohen, J Cozzi, JD Delhanty, JD Delhanty, JD Delhanty, JD Delhanty, KT Jones, L Gianaroli, L Gras, L Voullaire, L Voullaire, L Wilton, M Hultén, M Sandalinas, M Simopoulou, MA Hultén, ML Lenzi, NV Kovaleva, P Platteau, PA Almeida, PA Hunt, R Angell, R Mahmood, S Cupisti, S Evsikov, S Mastenbroek, S Munné, S Munné, S Munné, S Munné, S Munné, S Munné, S Munné, S Munné, T Anahory, T Hassold, TR Oliver, Y Verlinsky   +65 more
core   +1 more source

The cell cycle timing of centromeric chromatin assembly in Drosophila meiosis is distinct from mitosis yet requires CAL1 and CENP-C.

PLoS Biology, 2012
CENP-A (CID in flies) is the histone H3 variant essential for centromere specification, kinetochore formation, and chromosome segregation during cell division.
Elaine M Dunleavy, Nicole L Beier, Walter Gorgescu, Jonathan Tang, Sylvain V Costes, Gary H Karpen   +5 more
doaj   +1 more source