Results 91 to 100 of about 6,599,798 (249)

New insights into the putative XX/XY sex chromosomal system in blue‐eyed red‐fin pleco Hypostomus soniae (Siluriformes, Loricariidae)

Journal of Fish Biology, EarlyView.
Abstract Blue‐eyed red‐fin pleco Hypostomus soniae (family Loricariidae) presented a putative sex system XX/XY in early stage. Aiming to explore the inter‐populational karyotypic variation and proposed emergence of the XX/XY system, we studied 13 H. soniae individuals (6 males, 7 females) from the Tapajós River.
Luan Aércio Melo Maciel, Renata Coelho Rodrigues Noronha, Bruno Rafael Ribeiro de Almeida, Manoella Gemaque Cavalcante, Cleusa Yoshiko Nagamachi, Julio Cesar Pieczarka, Luís Reginaldo R. Rodrigues   +6 more
wiley   +1 more source

Intercellular Migration of Centrioles in the Germarium of \u3cem\u3eDrosophila melanogaster\u3c/em\u3e. An Electron Microscopic Study [PDF]

, 1970
A cluster of centrioles has been found in the early Drosophila oocyte. Since the oocyte is connected to 15 nurse cells by a system of intercellular bridges or ring canals, the possibility that the cluster of centrioles arose in the germarium from an ...
Mahowald, Anthony P., Strassheim, Joan M.   +1 more
core   +1 more source

Proteomic analysis of the zone of degeneration at the mitosis–meiosis transition stage in wild‐caught male catshark (Scyliorhinus canicula), correlated with an unusually high‐water temperature in the English Channel

Journal of Fish Biology, EarlyView.
Abstract In the context of current global change, variations in water temperature are one of the environmental conditions with serious consequences for marine life, including reproductive processes. In the small spotted catshark Scyliorhinus canicula, spermatogenesis occurs in spermatocysts composed of synchronously developing germ cells associated ...
Fabian Jeanne, Stanislas Pilet, Sean Heighton, Benoît Bernay, Pascal Sourdaine   +4 more
wiley   +1 more source

The synaptonemal complex has liquid crystalline properties and spatially regulates meiotic recombination factors

eLife, 2017
The synaptonemal complex (SC) is a polymer that spans ~100 nm between paired homologous chromosomes during meiosis. Its striated, periodic appearance in electron micrographs led to the idea that transverse filaments within this structure ‘crosslink’ the ...
O. Rog, S. Köhler, A. Dernburg
semanticscholar   +1 more source

Review of expansion microscopy combined with advanced imaging modalities

Journal of Microscopy, EarlyView.
Abstract Expansion microscopy (ExM) is a powerful high‐resolution imaging technique that enhances the spatial resolution of conventional light microscopy by physically enlarging biological specimens by embedding and cross‐linking them in a swellable polymer network.
Natalie Woo, Claire M. Brown
wiley   +1 more source

Tracking down the molecular architecture of the synaptonemal complex by expansion microscopy

bioRxiv, 2019
The synaptonemal complex (SC) is a meiosis-specific nuclear multiprotein complex that is essential for proper synapsis, recombination and segregation of homologous chromosomes. We combined structured illumination microscopy (SIM) with different expansion
Fabian Zwettler, M. Spindler, Sebastian Reinhard, Teresa Klein, Andrea Kurz, R. Benavente, M. Sauer   +6 more
semanticscholar   +1 more source

Homolog pairing during meiosis : dyneins on the move [PDF]

, 2010
Meiosis is a specialized form of cell division that generates haploid gametes from diploid cells. This is achieved by having 1 round of DNA replication followed by 2 rounds of nuclear division.
Arumugam, Prakash
core   +1 more source

Loss of E3 ligase HvST1 function substantially increases distal crossover frequency

New Phytologist, Volume 249, Issue 3, Page 1325-1341, February 2026.
Summary This study characterizes the function of a grass‐specific E3 ubiquitin ligase, HvST1, in regulating synapsis and crossover (CO) formation during meiosis in barley (Hordeum vulgare). In large‐genome cereals, COs are predominantly restricted to distal chromosomal regions, limiting genetic recombination and breeding flexibility.
Jamie Neil Orr, Sybille Ursula Mittmann, Luke Ramsay, Dominika Lewandowska, Abdellah Barakate, Malcolm Macaulay, Nicola McCallum, Robbie Waugh, Isabelle Colas   +8 more
wiley   +1 more source

Molecular structure of human synaptonemal complex protein SYCE1

Chromosoma, 2019
The reduction in chromosome number during meiosis is essential for the production of haploid germ cells and thereby fertility. To achieve this, homologous chromosomes are first synapsed together by a protein assembly, the synaptonemal complex (SC), which
O. Dunne, O. Davies
semanticscholar   +1 more source

YKT6 Is Essential for Male Fertility by Promoting Meiosis Progression During Spermatogenesis of Mice

Cell Proliferation, Volume 59, Issue 1, January 2026.
Specifically ablating Ykt6 in pre‐meiotic germ cells and meiotic spermatocytes leads to complete sterility and meiotic arrest in conditional knockout male mice. YTK6 is required for stabilising intercellular bridges between spermatocytes due to its key role in maintaining protein homeostasis and vesicular transport‐dependent functions in spermatocytes,
Jie Cen, Xiaochen Yu, Ziqi Wang, Wenbo Liu, Jianze Xu, Qian Fang, Fei Gao, Yongzhi Cao, Hongbin Liu   +8 more
wiley   +1 more source