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Chromosomal rDNA Distribution Patterns in Clonal Triploid Hybrids (Teleostei, Cobitidae): Insights into Parental Genomic Contributions.
Genes (Basel)
January 2025
Department of Zoology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland.
Interspecific hybridization between relative species (with a diploid genome designated as TT), (EE) and (NN) and the successive polyploidization with transitions from sexuality to asexuality experienced by triploid hybrids likely influence their chromosomal rearrangements, including rearrangements of ribosomal DNA (rDNA) distribution patterns. Previously, we documented distinct karyotypic differences: exhibited bi-armed chromosomes while showed uni-armed chromosomes with rDNA-positive hybridization signals, respectively. In this study, fluorescence in situ hybridization (FISH) with rDNA and rDNA probes was used to analyze and compare chromosomal distribution patterns of rDNAs in clonally reproduced triploid hybrids of different genomic constitutions ETT, ETN, EEN and EET (referred to using acronyms denoting the haploid genomes of their parent species), and their parental species.
View Article and Find Full Text PDFLampbrush 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 PDFThe phenotype, sex ratio and gonadal development in triploid hybrids of rainbow trout (Oncorhynchus mykiss) ♀ and brook trout (Salvelinus fontinalis) ♂.
Anim Reprod Sci
January 2025
Department of Marine Biology and Biotechnology, Faculty of Oceanography and Geography, University of Gdansk, M. Piłsudskiego 46 Av, Gdynia 81-378, Poland.
Article Synopsis
- The study analyzed the phenotype, genetic sex ratio, and gonadal development of triploid hybrids from rainbow and brook trout at different life stages (juvenile, sub-adult, adult).
- Genetic analysis confirmed the fish's hybrid status, identifying three phenotypes: trout-like, salmon-like, and an intermediate type, with varying frequencies among the samples.
- Results indicated that salmon-like hybrids are the most commercially valuable due to their unique appearance and sterility or delayed maturation, making them ideal for aquaculture.
Insights into Mitochondrial Rearrangements and Selection in Accipitrid Mitogenomes, with New Data on and .
Genes (Basel)
November 2024
Animal Genomics and Bioresource Research Unit (AGB Research Unit), Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.
Background/objectives: Accipitridae mitogenomes exhibit unique structural variations, including duplicated control regions (CRs) that undergo gradual degeneration into pseudo-CRs, revealing a complex evolutionary landscape. However, annotation of this characteristic in a subset of accipitrid genomes is lacking. Due to the taxonomic diversity of Accipitridae and the presence of understudied species, comprehensive mitogenomic studies are essential.
View Article and Find Full Text PDFThe long-read assembly of Apareiodon sp., a neotropical fish with a ZZ/ZW sex chromosome system.
Genet Mol Biol
October 2024
Universidade Federal do Paraná, Centro Politécnico, Programa de Pós-Graduação em Genética, Curitiba, PR, Brazil.
Neotropical fishes emerge as an extremely diverse group of vertebrates where genomic strategies to evaluate structural and functional features are still beginning. Here, we present a second draft genome of Apareiodon sp. (2n=54, ZZ/ZW), adding PacBio technology whole genome sequencing, and assembling by combining two technologies (long and short reads).
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