Karyotype, C‐ and G‐banding, and nucleolar organizer regions of<i>conger conger</i>(osteichthyes, anguilliformes)

Salvadori, Susanna; Cau, Angelo; Coluccia, Elisabetta; Milia, A; Deiana, Anna Maria

doi:10.1080/11250009409355859

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…Low diploid numbers (2n = 38) and a high number of meta-submetacentric chromosomes seem to be the most common condition for Ophichthidae species ( Table 1 ). Species of the families Muraenesocidae, Congridae ( Salvadori et al , 1994 ), Anguillidae ( Sola et al , 1980 ; Sola et al , 1984 ) and Echelidae ( Amores et al , 1995 ) also share a similar karyotypic pattern. Phylogenetic affinities based on the C- and G-banding patterns have also been proposed for the families Anguillidae and Congridae ( Salvadori et al , 1994 ).…”

Section: Discussionmentioning

confidence: 99%

“…Polymorphisms of the size of ribosomal sites have already been identified in Anguilliformes ( Wiberg, 1983 ; Sola et al , 1984 ). Ribosomal sites are present in a single chromosome pair ( Salvadori et al , 1994 ) and four patterns have been reported so far, all of them in Atlantic species: at a terminal location on the long arms of a submetacentric chromosome pair such as observed in G. ocellatus ( Porto-Foresti et al , 2005 ); at the telomeres of the short arms of a subtelo/submetacentric chromosome pair (as found herein in M. ocellatus ; G. miliaris and E. nigricans ); at a terminal position on the short arms of an acrocentric pair (such as in M. pavonina ); and at an interstitial position, close to the centromeres on the long arms of an acrocentric pair (observed herein in G. vicinus ).…”

Section: Discussionmentioning

confidence: 99%

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Cytogenetical studies in five Atlantic Anguilliformes fishes

Vasconcelos

Molina

2009

Genet. Mol. Biol.

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The order Anguilliformes comprises 15 families, 141 genera and 791 fish species. Eight families had at least one karyotyped species, with a prevalence of 2n = 38 chromosomes and high fundamental numbers (FN). The only exception to this pattern is the family Muraenidae, in which the eight species analyzed presented 2n = 42 chromosomes. Despite of the large number of Anguilliformes species, karyotypic reports are available for only a few representatives. In the present work, a species of Ophichthidae, Myrichthys ocellatus (2n = 38; 8m+14sm+10st+6a; FN = 70) and four species of Muraenidae, Enchelycore nigricans (2n = 42; 6m+8sm+12st+16a; FN = 68), Gymnothorax miliaris (2n = 42; 14m+18sm+10st; FN = 84), G. vicinus (2n = 42; 8m+6sm+28a; FN = 56) and Muraena pavonina (2n = 42; 6m+4sm+32a; FN = 52), collected along the Northeastern coast of Brazil and around the St Peter and St Paul Archipelago were analyzed. Typical large metacentric chromosomes were observed in all species. Conspicuous polymorphic heterochromatic regions were observed at the centromeres of most chromosomes and at single ribosomal sites. The data obtained for Ophichthidae corroborate the hypothesis of a karyotypic diversification mainly due to pericentric inversions and Robertsonian rearrangements, while the identification of constant chromosome numbers in Muraenidae (2n = 42) suggests a karyotype diversification through pericentric inversions and heterochromatin processes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Cytogenetical studies in five Atlantic Anguilliformes fishes

Vasconcelos

Molina

2009

Genet. Mol. Biol.

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“…The specimens of C. conger analysed show the chromosome number (2n538) and morphology (NF550), the distribution of G-and C-bands and the localization of Ag-NORs previously described for the species (Salvadori et al 1994). In the present study, FISH with a 45S rDNA probe localized the major ribosomal gene family in only one pair, in the short arm of the smallest subtelocentric pair 19 ( Figure 1A).…”

Section: Resultsmentioning

confidence: 95%

“…Abbreviations: +, positivity; 2, negativity; /, no data available; A, terminal in the short arm of a middle submetacentric; B, proximal in a large/middle acrocentric; C, the entire short arm of a small/middle acro-subtelocentric; D, centromeric in a small acrocentric; E, proximal in the long arm of a large submetacentric. References: 1, reviewed in Salvadori et al (1997); 2, Takai et al (1987); 3, Salvadori et al (1994); 4, reviewed in Klinkhardt et al (1995); 5, Deiana et al (1990); 6, Coluccia et al (2001); 7, Cau et al (1988); 8, Pichiri et al (1995); 9, Salvadori et al (1995); 10, Amores et al (1995); 11, Thode (et al) 1985.…”

Section: Discussionmentioning

confidence: 99%

Colocalization of the ribosomal gene families inConger conger(Anguilliformes, Congridae)

Deiana

Coluccia

Cannas

et al. 2006

Italian Journal of Zoology

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The location of the major and minor ribosomal gene families in the conger eel (Conger conger) was investigated by in situ hybridization and CMA 3 staining. The two gene families were localized in only one chromosome pair, on the short arm of pair 19, in an entirely CMA 3 -positive region. Among the Anguilliformes, C. conger is the only species that shows the presence of the two gene families in the same chromosomal region.

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“…Among the Anguilliformes, this family shows high 2n values (Salvadori et al, 1994) and high DNA contents (Ronchetti et al, 1995). The karyotype of the studied Muraenidae is characterized by a highly uniform chromosome number (2n = 42 in 6 out of 7 species), while the karyotype structure varies significantly as shown by the large difference in arm number (Table I).…”

Section: Introductionmentioning

confidence: 99%