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Article

Highly Rearranged Karyotypes and Multiple Sex Chromosome Systems in Armored Catfishes from the Genus Harttia (Teleostei, Siluriformes)

1
Laboratório de Citogenética de Peixes, Departamento de Genética e Evolução, Universidade Federal de São Carlos, São Carlos SP 13565-905, Brazil
2
Laboratório de Biologia Cromossômica, Estrutura e Função, Departamento de Biologia Estrutural, Molecular e Genética, Universidade Estadual de Ponta Grossa, Ponta Grossa PR 84030-900, Brazil
3
Institute of Human Genetics, University Hospital Jena, 07747 Jena, Germany
*
Author to whom correspondence should be addressed.
Genes 2020, 11(11), 1366; https://doi.org/10.3390/genes11111366
Received: 19 October 2020 / Revised: 15 November 2020 / Accepted: 16 November 2020 / Published: 18 November 2020
Harttia comprises an armored catfish genus endemic to the Neotropical region, including 27 valid species with low dispersion rates that are restricted to small distribution areas. Cytogenetics data point to a wide chromosomal diversity in this genus due to changes that occurred in isolated populations, with chromosomal fusions and fissions explaining the 2n number variation. In addition, different multiple sex chromosome systems and rDNA loci location are also found in some species. However, several Harttia species and populations remain to be investigated. In this study, Harttia intermontana and two still undescribed species, morphologically identified as Harttia sp. 1 and Harttia sp. 2, were cytogenetically analyzed. Harttia intermontana has 2n = 52 and 2n = 53 chromosomes, while Harttia sp. 1 has 2n = 56 and 2n = 57 chromosomes in females and males, respectively, thus highlighting the occurrence of an XX/XY1Y2 multiple sex chromosome system in both species. Harttia sp. 2 presents 2n = 62 chromosomes for both females and males, with fission events explaining its karyotype diversification. Chromosomal locations of the rDNA sites were also quite different among species, reinforcing that extensive rearrangements had occurred in their karyotype evolution. Comparative genomic hybridization (CGH) experiments among some Harttia species evidenced a shared content of the XY1Y2 sex chromosomes in three of them, thus pointing towards their common origin. Therefore, the comparative analysis among all Harttia species cytogenetically studied thus far allowed us to provide an evolutionary scenario related to the speciation process of this fish group. View Full-Text
Keywords: chromosomal rearrangements; comparative genomic hybridization; fish mapping; fish species; karyotype evolution; sex chromosomes chromosomal rearrangements; comparative genomic hybridization; fish mapping; fish species; karyotype evolution; sex chromosomes
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MDPI and ACS Style

Deon, G.A.; Glugoski, L.; Vicari, M.R.; Nogaroto, V.; Sassi, F.d.M.C.; Cioffi, M.d.B.; Liehr, T.; Bertollo, L.A.C.; Moreira-Filho, O. Highly Rearranged Karyotypes and Multiple Sex Chromosome Systems in Armored Catfishes from the Genus Harttia (Teleostei, Siluriformes). Genes 2020, 11, 1366. https://doi.org/10.3390/genes11111366

AMA Style

Deon GA, Glugoski L, Vicari MR, Nogaroto V, Sassi FdMC, Cioffi MdB, Liehr T, Bertollo LAC, Moreira-Filho O. Highly Rearranged Karyotypes and Multiple Sex Chromosome Systems in Armored Catfishes from the Genus Harttia (Teleostei, Siluriformes). Genes. 2020; 11(11):1366. https://doi.org/10.3390/genes11111366

Chicago/Turabian Style

Deon, Geize Aparecida, Larissa Glugoski, Marcelo Ricardo Vicari, Viviane Nogaroto, Francisco de Menezes Cavalcante Sassi, Marcelo de Bello Cioffi, Thomas Liehr, Luiz Antonio Carlos Bertollo, and Orlando Moreira-Filho. 2020. "Highly Rearranged Karyotypes and Multiple Sex Chromosome Systems in Armored Catfishes from the Genus Harttia (Teleostei, Siluriformes)" Genes 11, no. 11: 1366. https://doi.org/10.3390/genes11111366

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