Diversity of Sex Chromosome Systems in Ancistrini (Loricariidae, Hypostominae): ZZ/ZW in &lt;b&gt;&lt;i&gt;Ancistrus taunayi &lt;/i&gt;&lt;/b&gt;Miranda Ribeiro, 1918

Konerat, Jocicléia Thums; Bueno, Vanessa; Margarido, Vladimir Pavan; Portela-Castro, Ana Luiza de Brito; Martins‐Santos, Isabel Cristina

doi:10.1159/000441431

Cited by 13 publications

(5 citation statements)

References 29 publications

(30 reference statements)

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“…de Oliveira et al 2009). In some cases, the accumulation of heterochromatin could be related to the origin of heteromorphic sex chromosomes, as found in Ancistrus prope dubius (Mariotto et al 2004, Mariotto and Miyazawa 2006) and Ancistrus taunayi (Konerat et al 2015), being also associated with paracentric inversions in the latter. Particularly in Ancistrus sp.…”

Section: Discussionmentioning

confidence: 95%

“…The 5S rDNA sites are commonly located in interstitial or proximal positions and separated from the 45S rDNA genes, as observed in many groups, but in Loricariidae little is known about the distribution and number of 5S ribosomal genes, being more studied for some species of Hypostomus Lacépède, 1803 (Kavalco et al 2004, 2005, Mendes-Neto et al 2011, Traldi et al 2012, Bueno et al 2014) and some Ancistrus species (Mariotto et al 2011, Konerat et al 2015, Favarato et al 2016). These studies indicate that the distribution of 5S rDNA genes varies considerably and may occur on one or more chromosome pairs, with or without synteny among the 18S rDNA sites.…”

Section: Introductionmentioning

confidence: 99%

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Cytogenetic data on Ancistrus sp. (Siluriformes, Loricariidae) of the Paraguay River basin (MS) sheds light on intrageneric karyotype diversification

Prizon

Borin-Carvalho

Bruschi

et al. 2016

CCG

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Ancistrus Kner, 1854 is a diverse catfish genus, currently comprising 66 valid species, but karyotype data were recorded for 33 species, although only ten have their taxonomic status defined. Considerable karyotype diversity has been found within this genus, with 2n varying from 34 to 54 and structural variability including heteromorphic sex chromosomes. In many cases, uncertainty on the taxonomic status of the study populations hampers reliable interpretation of the complex chromosomal evolutionary history of the group. This study aims to present the first karyotype data for a population of the Ancistrus sp. collected in Criminoso stream (tributary of the Paraguay River Basin, Mato Grosso do Sul, Brazil) in which a combination of different chromosomal markers was used and results integrated in broad discussion on karyotype evolution in the genus. The specimens presented 2n=42 with 18m+16sm+8st and a single NOR revealed by silver nitrate and fluorescence in situ hybridization (FISH) with 18S rDNA probe, located in pair No. 10. Clusters of 5S rDNA were located in the pericentromeric region of three chromosomes: pair No. 1 (metacentric) and one of the homologues of the nucleolar pair No. 10. Heterogeneity in the molecular composition of the heterochromatin was confirmed by the association of C-banding and fluorochrome CMA3/DAPI-staining. Exploring the differential composition of constitutive heterochromatin in Ancistrus may provide an important perspective to understand genome organization and evolution within this group. Our data reinforce the chromosomal diversity present in Ancistrus genus and we discuss the potential sources these variation. The karyotype structure of Ancistrus sp. “Criminoso stream” appears to be consistent with the existence of a new candidate species.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Cytogenetic data on Ancistrus sp. (Siluriformes, Loricariidae) of the Paraguay River basin (MS) sheds light on intrageneric karyotype diversification

Prizon

Borin-Carvalho

Bruschi

et al. 2016

CCG

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“…Loricariidae exhibits large variations in diploid number, ranging from 2n = 36 chromosomes in Loricaria latirostris Boulenger, 1900 (Giuliano-Caetano 1998) to 2n = 96 in Hemipsilichthys gobio Lütken, 1874 (Kavalco et al 2005, previously identified as Upsilodus sp.). This group shows several structural differences (Mariotto et al 2009), numerous polymorphisms (Giuliano-Caetano 1998, Cereali et al 2008), and morphologically differentiated sex chromosome systems (Alves et al 2006, Oliveira et al 2007, Konerat et al 2015, Oliveira et al 2015a, Rocha-Reis et al unpublished data), which nearly always correspond to unique chromosomal features.…”

Section: Introductionmentioning

confidence: 95%

Studies in two allopatric populations of Hypostomus affinis (Steindachner, 1877): the role of mapping the ribosomal genes to understand the chromosome evolution of the group

Brandão¹,

Reis²,

Garcia³

et al. 2018

CCG

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Several cytogenetic markers show chromosomal diversity in the fish such as “armoured catfish”. Although studies have characterized many species in the major genera representing these Siluridae, particularly in the genus Hypostomus Lacépède, 1803, trends in chromosome evolution of this group remain unclear. The Paraíba do Sul river basin contains the armoured catfish Hypostomus affinis Steindachner, 1877, which is unique because of its distribution of repetitive DNAs, the 5S and 18S rDNA. Identified samples and registered collections in Brazilian museums were identified as the same typological species, while we observed wide variations in the physical location of this gene in the karyotype based on fluorescent in situ hybridization results. In this study, we propose that these species can represent evolutionarily independent units, as these fish frequently undergo processes such as dispersion and vicariance and that the rDNA is associated with DNA that spreads in the genome, such as transposons. Additionally, the absence of gene flow due to the distance of the sample location could intensify evolutionary processes. The phenotypes found for the 18S rDNA showed minor changes in relation to the number of sites between the lower and upper drainage regions of Paraíba do Sul. The large difference in the number of sites found for the 5S rDNA entered the same region (upper drainage of the basin) and the literature data could represent a population dynamics where an expansion of the 5S rDNA sites provides an extinct or non-sampled cytotype in this work.

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“…The existence of individuals of the same species harboring different NOR patterns in sympatry is usually re-lated to different chromosomal rearrangements, mainly pericentric inversions and translocations [Mariotto et al, 2006;Porto et al, 2011;Konerat et al, 2015] and even with activity of moving transposable elements [Porto et al, 2014a, b]. We believe that the origin of numerical polymorphism in the distribution of the rDNA sites in A. grypus occurs as a remnant of nonreciprocal translocations between terminal segments of the pairs 13 and 28.…”

Section: Discussionmentioning

confidence: 99%

Karyotype Evolution of Talking Thorny Catfishes Anadoras (Doradidae, Astrodoradinae): A Process Mediated by Structural Rearrangements and Intense Reorganization of Repetitive DNAs

Takagui¹,

Baumgärtner²,

Viana³

et al. 2022

Cytogenet Genome Res

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Anadoras is a thorny catfish genus widespread through the Amazon and Paraguay river basins. It includes 2 nominal species, A. grypus and A. weddellii, plus Anadoras sp. “araguaia,” an undescribed species only recognized morphologically. Since Anadoras occupies a basal position within the Astrodoradinae phylogeny, it is crucial to identify its cytogenetic features to comprehend the mechanisms involved in the chromosomal diversification of this subfamily. Therefore, we performed a comparative cytogenetic analysis including all species of Anadoras. Furthermore, we applied a species delimitation analysis based on 600 bp of the mitochondrial cytochrome oxidase subunit 1 (CO1) gene to investigate the taxonomic status of the species. Cytogenetic markers revealed a high degree of similarity among Anadoras weddellii and Anadoras sp. “araguaia,” both have 2n = 56 chromosomes (24m + 10sm + 22st/a), single NOR sites on acrocentric pair 28, and 5S rDNA sites on submetacentric pair 15. A. grypus has the most divergent chromosomal characteristics because, even though it also has 2n = 56 chromosomes, it exhibits several differences in the chromosome formula, heterochromatin distribution, and number/position of the rDNA sites. In sum, we believe that the chromosome diversification of Anadoras is due to 4 mechanisms: centric fusion, pericentric/paracentric inversions, nonreciprocal translocations, and activity of transposable elements. Additionally, our phylogenetic tree revealed well-supported clades and, by barcode species delimitation analysis, confirmed the existence of 3 molecular operational taxonomic units, including the putative new species Anadoras sp. “araguaia.”

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Diversity of Sex Chromosome Systems in Ancistrini (Loricariidae, Hypostominae): ZZ/ZW in <b><i>Ancistrus taunayi </i></b>Miranda Ribeiro, 1918

Cited by 13 publications

References 29 publications

Cytogenetic data on Ancistrus sp. (Siluriformes, Loricariidae) of the Paraguay River basin (MS) sheds light on intrageneric karyotype diversification

Cytogenetic data on Ancistrus sp. (Siluriformes, Loricariidae) of the Paraguay River basin (MS) sheds light on intrageneric karyotype diversification

Studies in two allopatric populations of Hypostomus affinis (Steindachner, 1877): the role of mapping the ribosomal genes to understand the chromosome evolution of the group

Karyotype Evolution of Talking Thorny Catfishes Anadoras (Doradidae, Astrodoradinae): A Process Mediated by Structural Rearrangements and Intense Reorganization of Repetitive DNAs

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