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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Meiotic self-pairing of the Psalidodon (Characiformes, Characidae) iso-B chromosome: A successful perpetuation mechanism

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Duílio Mazzoni Zerbinato de Andrade Silva ; Cristian Araya-Jaime ; Masakane Yamashita ; Mateus Rossetto Vidal ; Claudio Oliveira ; Fábio Porto-Foresti ; Roberto Ferreira Artoni ; Fausto Foresti
Total Authors: 8
Document type: Journal article
Source: GENETICS AND MOLECULAR BIOLOGY; v. 44, n. 3, p. -, 2021.
Web of Science Citations: 0

Abstract B chromosomes are non-essential additional genomic elements present in several animal and plant species. In fishes, species of the genus Psalidodon (Characiformes, Characidae) harbor great karyotype diversity, and multiple populations carry different types of non-essential B chromosomes. This study analyzed how the dispensable supernumerary B chromosome of Psalidodon paranae behaves during meiosis to overcome checkpoints and express its own meiosis-specific genes. We visualized the synaptonemal complexes of P. paranae individuals with zero, one, or two B chromosomes using immunodetection with anti-medaka SYCP3 antibody and fluorescence in situ hybridization with a (CA)15 microsatellite probe. Our results showed that B chromosomes self-pair in cells containing only one B chromosome. In cells with two identical B chromosomes, these elements remain as separate synaptonemal complexes or close self-paired elements in the nucleus territory. Overall, we reveal that B chromosomes can escape meiotic silencing of unsynapsed chromatin through a self-pairing process, allowing expression of their own genes to facilitate regular meiosis resulting in fertile individuals. This behavior, also seen in other congeneric species, might be related to their maintenance throughout the evolutionary history of Psalidodon. (AU)

FAPESP's process: 16/09204-6 - Biodiversity and Biogeography in marine-estuarine fishes (Teleostei) from Brazil
Grantee:Claudio de Oliveira
Support type: Regular Research Grants
FAPESP's process: 18/20610-1 - Study of the biogeography of the Brazilian coast using data population genetic data of marine catfish of the genera Cathorops and Genidens
Grantee:Claudio de Oliveira
Support type: Regular Research Grants
FAPESP's process: 17/15608-5 - Meiotic chromosomes in fish: synaptic behavior and transcriptional status visualized by immunofluorescence.
Grantee:Fausto Foresti
Support type: Regular Research Grants
FAPESP's process: 17/22447-8 - Comparative Genetic Activity on B Chromosomes of Astyanax species (Teleostei, Characiformes)
Grantee:Duílio Mazzoni Zerbinato de Andrade Silva
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/26508-3 - Phylogeny of the hyperdiverse order Characiformes (Teleostei: Ostariophysi) using ultraconserved elements
Grantee:Claudio de Oliveira
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/09634-5 - Functional and evolutionary analysis of b chromosomes using the Astyanax paranae fish (Characiformes Characidae) as model
Grantee:Fausto Foresti
Support type: Regular Research Grants