Chromosomal Mapping of the Histone Multigene Family and U2 snRNA in <i>Hypancistrus</i> Species (Siluriformes, Loricariidae) from the Brazilian Amazon

Santos, Carlos Eduardo Vasconcelos Dos; Almeida, Bruno Rafael Ribeiro de; Tavares, Flávia dos Santos; Frade, Luan Felipe da Silva; Cardoso, Adauto Lima; Sá, André Luiz Alves de; Nagamachi, Cleusa Yoshiko; Sousa, Leandro Melo de; Pieczarka, Júlio César; Noronha, Renata Coelho Rodrigues

doi:10.1089/zeb.2022.0030

Zebrafish

2023

DOI: 10.1089/zeb.2022.0030

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Chromosomal Mapping of the Histone Multigene Family and U2 snRNA in Hypancistrus Species (Siluriformes, Loricariidae) from the Brazilian Amazon

Carlos Eduardo Vasconcelos Dos Santos

Bruno Rafael Ribeiro de Almeida

Flávia dos Santos Tavares

et al.

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Cited by 2 publications

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A new species of Hypancistrus Isbrücker & Nijssen 1991 (Loricariidae, Siluriformes) from the rapids of the middle Rio Tocantins

Araújo,

Ferreira,

Monteiro

et al. 2024

Journal of Fish Biology

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The Hypancistrus genus is recognized in the Río Orinoco basin and Rio Xingu in the Guiana and Brazilian Shields, respectively. Some of its species are important in ornamental fishing. Despite this significance, many other undescribed species are still awaiting to be named. Here we describe a new species of Hypancistrus found on bedrock in the Rio Tocantins, representing an extension of the distribution of the genus. Also, a multigene phylogeny is presented to evaluate the taxonomic position of this species concerning congeners. The new species differs from all congeners by (1) hypertrophied odontodes on cheeks reaching beyond the cleithrum, (2) a supraoccipital crest conspicuously elevated, (3) a supraorbital crest slightly convex, (4) oblique bars on the anterior part of the body, (5) a dark E‐shaped mark on the snout, (6) three oblique dark bars on the anterior part of the body and horizontal vermicular bars from the pectoral girdle to the posterior insertion of the dorsal fin, (7) a thin light gray bar on the posterior of the head extending across the branchial opening, (8) a tan background color, (9) a developed suspensorium with a diminished appendix in the metapterygoid, and (10) a dentary plate robust significantly fused with the angulo‐articular bone. The molecular phylogenetic results show the new species forming a group with Hypancistrus zebra (Brazilian Shield—Rio Xingu) as a clade, a sister group of a monophyletic group consisting of all congeners from the Río Orinoco.

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A new species of Hypancistrus Isbrücker & Nijssen 1991 (Loricariidae, Siluriformes) from the rapids of the middle Rio Tocantins

Araújo,

Ferreira,

Monteiro

et al. 2024

Journal of Fish Biology

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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

Almeida,

Farias Souza,

Alves

et al. 2023

Biology Open

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In 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.

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Chromosomal Mapping of the Histone Multigene Family and U2 snRNA in Hypancistrus Species (Siluriformes, Loricariidae) from the Brazilian Amazon

Cited by 2 publications

References 46 publications

A new species of Hypancistrus Isbrücker & Nijssen 1991 (Loricariidae, Siluriformes) from the rapids of the middle Rio Tocantins

A new species of Hypancistrus Isbrücker & Nijssen 1991 (Loricariidae, Siluriformes) from the rapids of the middle Rio Tocantins

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

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