When Pleurodeles (Amphibian, Urodele) females were subjected to high temperatures (32-35 degrees C) for varying periods of time (45 min to 7 days), lampbrush chromosome structure underwent striking modifications. These changes included a numerical reduction in normal loops and progressive disorganization of RNP matrices of various loops. The degree of such disorganization was a function of the intensity and duration of the stress. These modifications were completely reversible when females or oocytes were returned to a normal breeding temperature (20 degrees C). Results are discussed in comparison with previous studies on morphological changes induced by heat shock in lampbrush chromosomes carried out in vitro.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0014-4827(89)90324-8 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Lampbrush chromosomes of Danio rerio.
Chromosome Res
January 2025
Saint-Petersburg State University, Saint-Petersburg, Russia.
Danio rerio, commonly known as zebrafish, is an established model organism for the developmental and cell biology studies. Although significant progress has been made in the analysis of the D. rerio genome, cytogenetic studies face challenges due to the unclear identification of chromosomes.
View Article and Find Full Text PDFSeven Theorems of Joseph G. Gall.
Exp Cell Res
January 2025
School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China; Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3PT, UK. Electronic address:
On June 30, 2020, Professor Joseph Grafton Gall announced his retirement at 92. On August 13, 2020, Joe's former trainees and colleagues held a retirement celebration online to celebrate Joe's "Remarkable Career with Astonishing Discoveries", covering Joe's nearly 70 years of education and research. As a representative of Joe's trainees in the 2000s, I gave a speech titled "Seven Theorems of Joe".
View Article and Find Full Text PDFThe first chicken oocyte nucleus whole transcriptomic profile defines the spectrum of maternal mRNA and non-coding RNA genes transcribed by the lampbrush chromosomes.
Nucleic Acids Res
November 2024
Laboratory of Cell Nucleus Structure and Dynamics, Department of Cytology and Histology, Saint-Petersburg State University, Saint-Petersburg, 199034, Russia.
Lampbrush chromosomes, with their unusually high rate of nascent RNA synthesis, provide a valuable model for studying mechanisms of global transcriptome up-regulation. Here, we obtained a whole-genomic profile of transcription along the entire length of all lampbrush chromosomes in the chicken karyotype. With nuclear RNA-seq, we obtained information about a wider set of transcripts, including long non-coding RNAs retained in the nucleus and stable intronic sequence RNAs.
View Article and Find Full Text PDFMeiotic deviations and endoreplication lead to diploid oocytes in female hybrids between bighead catfish () and North African catfish ().
Front Cell Dev Biol
August 2024
Animal Genomics and Bioresource Research Unit (AGB Research Unit), Faculty of Science, Kasetsart University, Bangkok, Thailand.
Article Synopsis
- - Reproductive isolation and hybrid sterility prevent genetic mixing between species, but hybridization of bighead and North African catfish in Thailand shows complex evolution, including the formation of all-female lineages that can reproduce clonally.
- - The study analyzed meiosis in female hybrids, revealing over 95% exhibited chromosome asynapsis yet could produce mature eggs, indicating a unique path to reproductive success.
- - Findings suggest that the ability of female hybrid catfish to reproduce clonally may offer insights into the effects of hybridization and mechanisms of asexual reproduction, drawing parallels with known clonal species in the animal kingdom.
Secondary growth ovarian follicles of the pigmented sterlet sturgeon Acipenser ruthenus L. 1758 (Acipenseriformes, Chondrostei, Actinopterygii, Osteichthyes) - Microscopic study of oocytes, egg envelope and diversification of follicular cells.
Micron
November 2024
Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Vodňany, Czechia.
The individual ovarian follicle of sturgeons (Acipenseriformes, Acipenseridae) contains an oocyte surrounded by follicular cells (FCs), basal lamina, and thecal cells. The late stages of the secondary growth of follicles (mid- and advanced vitellogenic) are not fully explained in Acipenseriformes. To explore and discuss the ultrastructure of oocytes, FCs, an egg envelope, and explain how micropylar cells differentiate and the canals of a multiple micropyle are formed, the samples of ovaries of the mature sterlet sturgeon Acipenser ruthenus were examined.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!