Results 41 to 50 of about 2,060 (125)

Meiotic chromosome pairing is promoted by telomere-led chromosome movements independent of bouquet formation. [PDF]

PLoS Genetics, 2012
Chromosome pairing in meiotic prophase is a prerequisite for the high fidelity of chromosome segregation that haploidizes the genome prior to gamete formation. In the budding yeast Saccharomyces cerevisiae, as in most multicellular eukaryotes, homologous
Chih-Ying Lee, Michael N Conrad, Michael E Dresser   +2 more
doaj   +1 more source

Differential gene expression in Chorthippus parallelus (Zetterstedt, 1821) (Orthoptera: Acrididae: Gomphocerinae) induced by Wolbachia infection

Insect Science, EarlyView.
Distinct lineages of the grasshopper Chorthippus parallelus (Orthoptera: Acrididae) form a well‐known hybrid zone (HZ) in the Pyrenees mountain range; the Iberian endemism C. p. erythropus (Cpe) and the subspecies C. p. parallelus, (Cpp) widely distributed throughout the rest of Europe. Both subspecies differ in diverse traits, including the strains of
Patricia Jiménez‐Florido, Mónica Aquilino, David Buckley, José L. Bella, Rosario Planelló   +4 more
wiley   +1 more source

Molecular analysis of the effects of steroid hormones on mouse meiotic prophase I progression

Reproductive Biology and Endocrinology, 2019
Background Infertility is linked to depletion of the primordial follicle pool consisting of individual oocytes arrested at the diplotene stage of meiotic prophase I surrounded by granulosa cells.
Deion M. Burks, Margaret R. McCoy, Sudipta Dutta, Connie J. Mark-Kappeler, Patricia B. Hoyer, Melissa E. Pepling   +5 more
doaj   +1 more source

Cytochemical investigations of the megasporocyte and embryo sac in Lilium regale at various stages of development

Acta Societatis Botanicorum Poloniae, 2015
During megasporocyte and embryo sac development in Lilium regale, characteristic changes were noted within the cytoplasm. In the course of prophase I there appear parallel systems of endoplasmic reticulum cisternae which further transform to cytoplasmic ...
C. Marciniak
doaj   +1 more source

The use of deidentified organ donor testes for research

Andrology, EarlyView.
Abstract Our knowledge of testis development and function mainly comes from research using mammalian model organisms, primarily the mouse. However, there are integral differences between men and other mammalian species regarding cellular composition and expression profiles during fetal and post‐natal testis development and in the mature testis ...
Marina V. Pryzhkova, Marnie W. Skinner, Juliana I. Candelaria, Stephen R. Wellard, Philip W. Jordan   +4 more
wiley   +1 more source

Atypical heat shock transcription factor HSF5 is critical for male meiotic prophase under non-stress conditions

Nature Communications
Meiotic prophase progression is differently regulated in males and females. In males, pachytene transition during meiotic prophase is accompanied by robust alteration in gene expression.
Saori Yoshimura, Ryuki Shimada, Koji Kikuchi, Soichiro Kawagoe, Hironori Abe, Sakie Iisaka, Sayoko Fujimura, Kei-ichiro Yasunaga, Shingo Usuki, Naoki Tani, Takashi Ohba, Eiji Kondoh, Tomohide Saio, Kimi Araki, Kei-ichiro Ishiguro   +14 more
doaj   +1 more source

PCC-like induction of mitosis in Chara vulgaris antheridia initiating differentiation of spermatozoids in the darkness

Acta Societatis Botanicorum Poloniae, 2014
The objects of this research were the antheridial filament cells of Chara vulgaris which after 5-day mitodepressing treatment of the darkness reactivated mitosis (without light stimulation) in the result of the physiological state evocing the initiation ...
Maria Kwiatkowska
doaj   +1 more source

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

Cell Proliferation, EarlyView.
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

The Phosphatase Dusp7 Drives Meiotic Resumption and Chromosome Alignment in Mouse Oocytes

Cell Reports, 2016
Summary: Mammalian oocytes are stored in the ovary, where they are arrested in prophase for prolonged periods. The mechanisms that abrogate the prophase arrest in mammalian oocytes and reinitiate meiosis are not well understood.
Thomas Tischer, Melina Schuh
doaj   +1 more source

Transcription Factor TCF12‐Mediated Maternal Gene Expressions in Mouse Oocyte Are Prerequisites of Successful Fertilisation and Zygotic Genome Activation

Cell Proliferation, EarlyView.
Maternal TCF12 ensures the competence of fertilisation by controlling the expression of Astl and the proper location of cortical granules. Furthermore, maternal TCF12 maintains the phosphatase activity of PP2A by regulating the expression of Arpp19. Oocyte‐specific deletion of Tcf12 leads to fertilisation defects as well as ZGA failure at the 2‐cell ...
Lan‐Rui Cao, Chi Zhang, Zuo‐Qi Deng, Yue‐xin Qiu, Zhao Zhang, Heng‐Yu Fan, Jing Li, Hong‐Bo Wu   +7 more
wiley   +1 more source