Karyoevolution of Crenicichla heckel 1840 (Cichlidae, Perciformes): a process mediated by inversions.

Autor:	Frade LFDS; Centro de Estudos Avançados da Biodiversidade, Universidade Federal do Pará, Campus Guamá, Rua Augusto Corrêa, n° 01. Guamá, Belém, Pará, Brasil., Almeida BRR; Centro de Estudos Avançados da Biodiversidade, Universidade Federal do Pará, Campus Guamá, Rua Augusto Corrêa, n° 01. Guamá, Belém, Pará, Brasil., Milhomem-Paixão SSR; Instituto Federal de Educação, Ciência e Tecnologia de Goiás, campus Valparaıso de Goiás, BR-040, km 6, Avenida Saia Velha, S/N, Área 8, Parque Esplanada V. 72.876-601, Valparaíso de Goiás, Goiás, Brasil., Ready JS; Centro de Estudos Avançados da Biodiversidade, Universidade Federal do Pará, Campus Guamá, Rua Augusto Corrêa, n° 01. Guamá, Belém, Pará, Brasil., Nagamachi CY; Centro de Estudos Avançados da Biodiversidade, Universidade Federal do Pará, Campus Guamá, Rua Augusto Corrêa, n° 01. Guamá, Belém, Pará, Brasil., Pieczarka JC; Centro de Estudos Avançados da Biodiversidade, Universidade Federal do Pará, Campus Guamá, Rua Augusto Corrêa, n° 01. Guamá, Belém, Pará, Brasil., Noronha RCR; Centro de Estudos Avançados da Biodiversidade, Universidade Federal do Pará, Campus Guamá, Rua Augusto Corrêa, n° 01. Guamá, Belém, Pará, Brasil renatarcrn@gmail.com.
Jazyk:	angličtina
Zdroj:	Biology open [Biol Open] 2019 May 09; Vol. 8 (5). Date of Electronic Publication: 2019 May 09.
DOI:	10.1242/bio.041699
Abstrakt:	Crenicichla (Cichliformes, Cichlidae) present a highly conserved diploid number 2n=48 with fundamental numbers varying between 52 and 62. We analyzed four species in order to investigate the role of repetitive DNA in chromosome evolution in the genus. Crenicichla johanna , Crenicichla cf. saxatilis and Crenicichla cf. regani have 2n=48 (8 m/sm and 40st/a) and FN=56, while Crenicichla sp. 'Xingu I' has 2n=48 (48 st/a) and FN=48. Different patterns of constitutive heterochromatin distribution were observed including pericentric, interstitial and whole arm C bands. A single chromosome bears 18S rDNA clusters in most species, except C. johanna , where population variation exists in terms of the quantity and distribution of clusters and their association with interstitial telomeric sequences. All species showed hybridization of 5S rDNA sequences in an interstitial region on an acrocentric chromosome pair. The karyotypic differences and maintenance of the diploid number supports chromosome evolution mediated by inversions in Crenicichla The telomeric and 18S rDNA sequence association in various chromosomes of C. johanna are proposed to represent hotspots for breakage, favoring intra-chromosomal rearrangements. The results suggest that repetitive sequences can contribute to microstructural cytogenetic diversity in Crenicichla . Competing Interests: Competing interestsThe authors declare no competing or financial interests. (© 2019. Published by The Company of Biologists Ltd.)
Databáze:	MEDLINE
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