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Chromosomal organization of multigene families and meiotic analysis in species of Loricariidae (Siluriformes) from Brazilian Amazon, with description of a new cytotype for genus Spatuloricaria

2023; The Company of Biologists; Volume: 12; Issue: 11 Linguagem: Inglês

10.1242/bio.060029

2046-6390

Bruno Rafael Ribeiro de Almeida, Luciano Farias Souza, Thyana Ayres Alves, Adauto Lima Cardoso, Juliana Amorim de Oliveira, Talita Fernanda Augusto Ribas, Carlos Eduardo Vasconcelos dos Santos, Luís Adriano Santos do Nascimento, Leandro Melo de Sousa, Iracilda Sampaio, Cesar Martins, Cleusa Yoshiko Nagamachi, Júlio César Pieczarka, Renata Coelho Rodrigues Noronha,

CRISPR and Genetic Engineering

In the Amazon, some species of Loricariidae are at risk of extinction due to habitat loss and overexploitation by the ornamental fish market. Cytogenetic data related to the karyotype and meiotic cycle can contribute to understanding the reproductive biology and help management and conservation programs of these fish. Additionally, chromosomal mapping of repetitive DNA in Loricariidae may aid comparative genomic studies in this family. However, cytogenetics analysis is limited in Amazonian locariids. In this study, chromosomal mapping of multigenic families was performed in Scobinancistrus aureatus, Scobinancistrus pariolispos and Spatuloricaria sp. Meiotic analyzes were performed in Hypancistrus zebra and Hypancistrus sp. "pão". Results showed new karyotype for Spatuloricaria sp. (2n=66, NF=82, 50m-10sm-6m). Distinct patterns of chromosomal organization of histone H1, histone H3 and snDNA U2 genes were registered in the karyotypes of the studied species, proving to be an excellent cytotaxonomic tool. Hypotheses to explain the evolutionary dynamics of these sequences in studied Loricariidae were proposed. Regarding H. zebra and H. sp. "pão", we describe the events related to synapse and transcriptional activity during the meiotic cycle, which in both species showed 26 fully synapsed bivalents, with high gene expression only during zygotene and pachytene. Both Hypancistrus species could be used may be models for evaluating changes in spermatogenesis of Loricariidae.