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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.
Cytogenetics of the Hybridogenetic Frog Pelophylax grafi and Its Parental Species Pelophylax perezi.
Genome Biol Evol
December 2023
Amphibian Biology Group, Department of Evolutionary Biology and Conservation of Vertebrates, Faculty of Biological Sciences, University of Wrocław, Wrocław, Poland.
Hybrid taxa from the genus Pelophylax can propagate themselves in a modified way of sexual reproduction called hybridogenesis ensuring the formation of clonal gametes containing the genome of only one parental (host) species. Pelophylax grafi from South-Western Europe is a hybrid composed of P. ridibundus and P.
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