B Chromosomes in Psalidodon scabripinnis (Characiformes, Characidae) Species Complex

Silva, Duílio Mazzoni Zerbinato de Andrade; Castro, Jonathan Pena; Goes, Caio Augusto Gomes; Utsunomia, Ricardo; Vidal, Mateus Rossetto; Nascimento, Cristiano Neves do; Lasmar, Lucas F; Paim, Fabilene Gomes; Soares, Letícia B; Oliveira, Cláudio; Porto‐Foresti, Fábio; Artoni, Roberto Ferreira; Foresti, Fausto

doi:10.3390/ani12172174

Cited by 3 publications

References 112 publications

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Supernumerary chromosomes contribute to karyotypic diversity within cryptic species of the subgenus Stenocranius (Cricetidae, Rodentia): comparative analyses of chromosomes and synaptonemal complexes

Pavlova

Romanenko

Matveevsky

et al. 2023

Preprint

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The subgenus Stenocranius includes two cryptic species, Lasiopodomys raddei and L. gregalis; the latter has three allopatric and genetically well-isolated lineages having unclear taxonomic rank. To determine possible karyotypic differences, 121 individuals from 37 localities (among them, 15 are previously unpublished sampling sites) were analysed. Besides differences in some chromosome traits, higher intra-specific karyotypic variation within L. gregalis is mostly due to various numbers of small heterochromatic acrocentric B chromosomes (Bs) whose number does not vary intra-individually. The Early Pleistocene relic L. raddei carries stable initial karyotype 2n = 36 without Bs, while among the L. gregalis lineages, the number of Bs varies from one to five: increasing from older lineage A to evolutionarily younger lineages B and C. In both cryptic species, the distribution pattern of ribosomal DNA varies in A chromosome sets and on Bs, whereas telomeric sequences are located only at the ends of all chromosomes, including Bs. Immunodetection of several meiotic proteins indicates that meio-Bs are transcriptionally inactive and have a pattern of meiotic behaviour similar to that of sex chromosomes. Further research is needed to clarify the nature, mechanisms of inheritance and stability of supernumerary chromosomes in narrow-headed voles.

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Supernumerary chromosomes contribute to karyotypic diversity within cryptic species of the subgenus Stenocranius (Cricetidae, Rodentia): comparative analyses of chromosomes and synaptonemal complexes

Pavlova

Romanenko

Matveevsky

et al. 2023

Preprint

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Comprehending the dynamism of B chromosomes in their journey towards becoming unselfish

Rajpal

Sharma

Sehgal

et al. 2023

Front. Cell Dev. Biol.

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Investigated for more than a century now, B chromosomes (Bs) research has come a long way from Bs being considered parasitic or neutral to becoming unselfish and bringing benefits to their hosts. B chromosomes exist as accessory chromosomes along with the standard A chromosomes (As) across eukaryotic taxa. Represented singly or in multiple copies, B chromosomes are largely heterochromatic but also contain euchromatic and organellar segments. Although B chromosomes are derived entities, they follow their species-specific evolutionary pattern. B chromosomes fail to pair with the standard chromosomes during meiosis and vary in their number, size, composition and structure across taxa and ensure their successful transmission through non-mendelian mechanisms like mitotic, pre-meiotic, meiotic or post-meiotic drives, unique non-disjunction, self-pairing or even imparting benefits to the host when they lack drive. B chromosomes have been associated with cellular processes like sex determination, pathogenicity, resistance to pathogens, phenotypic effects, and differential gene expression. With the advancements in B-omics research, novel insights have been gleaned on their functions, some of which have been associated with the regulation of gene expression of A chromosomes through increased expression of miRNAs or differential expression of transposable elements located on them. The next-generation sequencing and emerging technologies will further likely unravel the cellular, molecular and functional behaviour of these enigmatic entities. Amidst the extensive fluidity shown by B chromosomes in their structural and functional attributes, we perceive that the existence and survival of B chromosomes in the populations most likely seem to be a trade-off between the drive efficiency and adaptive significance versus their adverse effects on reproduction.

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Comparative cytogenetics of microsatellite distribution in two tetra fishes Astyanax bimaculatus (Linnaeus, 1758) and Psalidodon scabripinnis (Jenyns, 1842)

de Sousa,

Furo,

Silva-Oliveira

et al. 2024

PeerJ

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Background The main cytogenetic studies of the Characidae family comprise the genera Astyanax and Psalidodon involving the use of repetitive DNA probes. However, for the microsatellite classes, studies are still scarce and the function of these sequences in the genome of these individuals is still not understood. Thus, we aimed to analyze and compare the distribution of microsatellite sequences in the species Astyanax bimaculatus and Psalidodon scabripinnis. Methods We collected biopsies from the fins of A. bimaculatus and P. scabripinnis to perform cell culture, followed by chromosome extraction, and mapped the distribution of 14 microsatellites by FISH in both species. Results and Discussion The diploid number observed for both species was 2n = 50, with an acrocentric B microchromosome in A. bimaculatus and a metacentric B chromosome in P. scabripinnis. Regarding FISH, 11 probes hybridized in the karyotype of A. bimaculatus mainly in centromeric regions, and 13 probes hybridized in P. scabripinnis, mainly in telomeric regions, in addition to a large accumulation of microsatellite hybridization on its B chromosome. Conclusion Comparative FISH mapping of 14 microsatellite motifs revealed different patterns of distribution both in autosomes and supernumerary chromosomes of A. bimaculatus and P. scabripinnis, suggesting independent evolutionary processes in each of these species, representing excellent data on chromosome rearrangements and cytotaxonomy.

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B Chromosomes in Psalidodon scabripinnis (Characiformes, Characidae) Species Complex

Cited by 3 publications

References 112 publications

Supernumerary chromosomes contribute to karyotypic diversity within cryptic species of the subgenus Stenocranius (Cricetidae, Rodentia): comparative analyses of chromosomes and synaptonemal complexes

Supernumerary chromosomes contribute to karyotypic diversity within cryptic species of the subgenus Stenocranius (Cricetidae, Rodentia): comparative analyses of chromosomes and synaptonemal complexes

Comprehending the dynamism of B chromosomes in their journey towards becoming unselfish

Comparative cytogenetics of microsatellite distribution in two tetra fishes Astyanax bimaculatus (Linnaeus, 1758) and Psalidodon scabripinnis (Jenyns, 1842)

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