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1.
Wellcome Open Res ; 9: 37, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39267992

RESUMEN

The predominant research publishing system is not equitable by design, nor optimised to advance research to create knowledge and ultimately to benefit society. Open Research Central (ORC) was created to foster the re-imagination of the research dissemination system to facilitate trust, transparency and equitable participation. In five years of operation, before dissolving, the non-profit organisation produced outputs and learnings valuable to the development of a responsible research dissemination system. We are sharing our experience in the hope that it will provide others who share the same vision and goals with useful materials to build on. We think that there remains a need for global, cross-stakeholder exploration to build collective understanding of research validation and dissemination and to pilot solutions. However, as this article will explore, enabling and supporting the development of such a collective voice and consequent action is a challenging endeavour in the current landscape and funding environment.

2.
Comp Cytogenet ; 17: 157-162, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37469885

RESUMEN

The karyotype of the freshwater fish Sabanejewiabulgarica (Drensky, 1928), from the Danube Delta, was studied by conventional Giemsa staining and the C-banding technique. The diploid chromosome number was 2n = 50. The karyotype contained 2 pairs of metacentric (the first one was much larger than the second one), 6 pairs of submetacentric and 17 pairs of subtelocentric to acrocentric chromosomes. Pericentromeric blocks of heterochromatin were revealed in most of the chromosome pairs. The karyotype phenotype of S.bulgarica was the same as found for S.balcanica from Northern Carpathian Mountains.

3.
Int J Mol Sci ; 20(14)2019 Jul 19.
Artículo en Inglés | MEDLINE | ID: mdl-31331072

RESUMEN

The catfish family Siluridae contains 107 described species distributed in Asia, but with some distributed in Europe. In this study, karyotypes and other chromosomal characteristics of 15 species from eight genera were examined using conventional and molecular cytogenetic protocols. Our results showed the diploid number (2n) to be highly divergent among species, ranging from 2n = 40 to 92, with the modal frequency comprising 56 to 64 chromosomes. Accordingly, the ratio of uni- and bi-armed chromosomes is also highly variable, thus suggesting extensive chromosomal rearrangements. Only one chromosome pair bearing major rDNA sites occurs in most species, except for Wallago micropogon, Ompok siluroides, and Kryptoterus giminus with two; and Silurichthys phaiosoma with five such pairs. In contrast, chromosomes bearing 5S rDNA sites range from one to as high as nine pairs among the species. Comparative genomic hybridization (CGH) experiments evidenced large genomic divergence, even between congeneric species. As a whole, we conclude that karyotype features and chromosomal diversity of the silurid catfishes are unusually extensive, but parallel some other catfish lineages and primary freshwater fish groups, thus making silurids an important model for investigating the evolutionary dynamics of fish chromosomes.


Asunto(s)
Bagres/genética , Variación Genética , Genoma , Genómica , Cariotipo , Secuencias Repetitivas de Ácidos Nucleicos , Animales , Bagres/clasificación , Bandeo Cromosómico , Hibridación Genómica Comparativa , Análisis Citogenético , Genómica/métodos , Hibridación Fluorescente in Situ
4.
Comp Cytogenet ; 12(4): 483-491, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30498563

RESUMEN

The karyotype of Greek cobitid fish Cobitisstrumicae Karaman, 1955, from Lake Volvi, Greece, a representative of one of its two major intraspecific phylogenetic lineages, was analysed by means of sequential Giemsa-staining, C-banding, silver-staining, CMA3 fluorescence banding and also by in situ hybridization (FISH) with rDNA probe. The diploid chromosome number was 2n = 50, karyotype composed of 10 pairs of metacentric to submetacentric and 15 pairs of subtelocentric to acrocentric chromosomes. The nucleolus organizer regions (NORs) as revealed by Ag- and CMA3 staining and FISH were situated in the telomeric region of the fourth submetacentric chromosome pair. The chromosomes contained very low content of C-positive heterochromatin. No heteromorphic sex chromosomes were detected. This first karyotype report for any species of lineage Bicanestrinia Bacescu, 1962 shows a simple karyotype dominated by acrocentric chromosomes and possessing single NOR-bearing chromosome pair. Cytotaxonomic implications of this finding for the taxonomy of the genus Cobitis Linnaeus, 1758 are further discussed.

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