Karyological characterization of &lt;i&gt;Mugil trichodon&lt;/i&gt; Poey, 1876 (Pisces: Mugilidae)

Nirchio, Mauro; Ron, Ernesto; Rosi, Anna Rita

doi:10.3989/scimar.2005.69n4525

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…Only in two species, M. trichodon (Nirchio et al, 2005b) and M. rubrioculus , the NOR sites show an interstitial location. However, in these latter species, the NORbearing chromosomes are of medium size and smaller than the NOR-bearing chromosome pair of M. incilis.…”

Section: Discussionmentioning

confidence: 92%

Karyotype characterization of Mugil incilis Hancock, 1830 (Mugiliformes: Mugilidae), including a description of an unusual co-localization of major and minor ribosomal genes in the family

et al. 2011

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This study reports the description of the karyotype of Mugil incilis from Venezuela. The chromosome complement is composed of 48 acrocentric chromosomes, which uniformly decrease in size. Therefore, the homologues can not be clearly identified, with the exception of one of the largest chromosome pairs, classified as number 1, whose homologues may show a subcentromeric secondary constriction, and of chromosome pair number 24, which is considerably smaller than the others. C-banding showed heterochromatic blocks at the centromeric/pericentromeric regions of all chromosomes, which were more conspicuous on chromosomes 1, given the C-positive signals include the secondary constrictions. AgNO 3 and fluorescent in situ hybridization (FISH) with 45S rDNA demonstrated that the nucleolus organizer regions are indeed located on the secondary constrictions of chromosome pair number 1. FISH with 5S rDNA revealed that the minor ribosomal genes are located on this same chromosome pair, near the NORs, though signals are closer to the centromeres and of smaller size, compared to those of the major ribosomal gene clusters. This is the first description of co-localization of major and minor ribosomal genes in the family. Data are discussed from a cytotaxonomic and phylogenetic perspective.Se presenta la primera descripción del cariotipo de Mugil incilis de Venezuela. El complemento cromosómico está compuesto por 48 cromosomas acrocéntricos uniformemente decrecientes en tamaño. Por lo tanto, los homólogos no pueden ser claramente identificados, con excepción de uno de los pares de mayor tamaño, clasificado como número 1, cuyos homólogos poseen una constricción secundaria subcentromérica, y el par de cromosomas número 24, considerablemente más pequeño que los otros. El bandeo-C reveló bloques heterocromáticos en las regiones centroméricas/pericentroméricas de todos los cromosomas, más conspicuas en el cromosoma 1 en el que las señales C-positivas se encuentra localizada precisamente en la constricción secundaria. La tinción con AgNO 3 y la Hibridación Fluorescente in situ (FISH) con sonda 45S rDNA revelaron que las regiones organizadoras del nucléolo están ciertamente localizadas sobre la constricción secundaria del cromosoma número 1. FISH con 5S rDNA reveló que los genes ribosomales menores están ubicados en este mismo par cromosómico, en posición proximal a las NORs, aunque cercanas al centrómero y de menor tamaño en comparación con los clúster de genes ribosomales mayores. Ésta es la primera descripción de co-localización de genes ribosomales mayores y menores en la familia Mugilidae. Los datos se discuten bajo perspectivas citotaxonómicas y filogenéticas.

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Section: Discussionmentioning

confidence: 92%

Karyotype characterization of Mugil incilis Hancock, 1830 (Mugiliformes: Mugilidae), including a description of an unusual co-localization of major and minor ribosomal genes in the family

et al. 2011

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“…with an all-biarmed karyotype, were analysed by applying differential staining techniques and molecular cytogenetics, to further investigate karyotype evolution in the genus Mugil. In fact, with the exception of M. cephalus, available data on Mugil species only concerns Ag-stained nucleolus organizer regions (NORs) in these same species (Nirchio, Gonza´lez and Pe´rez, 2001;, in M. trichodon (Nirchio, Ron & Rossi, 2005) and in M. platanus (Jorda˜o et al, 1992), as well as the heterochromatin distribution in these latter two species (Jorda˜o et al, 1992;Nirchio, Ron & Rossi, 2004). The application of base-specific fluorochrome staining and the chromosome localization of major and minor ribosomal genes (rDNA), and telomeric repeats, indeed revealed the occurrence of finer differentiated features in the six Mediterranean mullets (Rossi et al, 1996(Rossi et al, , 2000Rossi, Gornung and Crosetti, 1997;Gornung et al, 2001Gornung et al, , 2004, characterized by the conservative karyotype.…”

Section: Introductionmentioning

confidence: 95%

“…This karyotype was more recently considered restricted to the ancestor of Euteleostei and Clupeomorha (Brum & Galetti, 1997). Within this karyological conservativeness, two, out of the nine analysed species of Mugil, show distinctive cytogenetic features, minor in M. trichodon (2n = 48 and fundamental number of chromosome arms, FN = 48), which is the only mugilid species showing interstitial NORs (Nirchio, Ron & Rossi, 2005), and more important in M. curema, which shows a reduced diploid number and a conserved FN. Indeed, specimens from Louisiana, USA (LeGrande &Fitzsimons, 1976), andParana`, Brazil (Cipriano, Cestari &Fenocchio, 2002), show a chromosome complement of 2n = 28 and FN = 48.…”

Section: Introductionmentioning

confidence: 96%

Comparative Molecular Cytogenetic Analysis of Two Congeneric Species, Mugil Curema and M. Liza (Pisces, Mugiliformes), Characterized by Significant Karyotype Diversity

et al. 2005

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Two congeneric mullet species, Mugil liza and M. curema, respectively with an all-uniarmed and an all-biarmed karyotype, were cytogenetically studied by base-specific fluorochrome staining and FISH-mapping of 45S and 5S ribosomal RNA genes (rDNA) and the (TTAGGG)(n) telomeric repeats. Whereas 45S rDNA sites might be homeologus in the two species, 5S rDNA sites are not, as they are localized on chromosome arms of different size. In both species, the (TTAGGG)(n) telomeric probe hybridized to natural telomeres and was found scattered along the NORs. In metacentric chromosomes of M. curema, no pericentromeric signals of the telomeric probe were detected. Data are discussed in relation to the karyotype evolution in Mugilidae and to the mechanisms and the evolutionary implications of Robertsonian rearrangements in M. curema.

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“…In the first group, NORs are located in a terminal position on the long arm of the largest chromosome pair (including M. cephalus , M. platanus , M. liza , and both M. incilis and M. curema 2n = 24 from Venezuela); in the second group, NORs are located on the short arm of a subtelocentric chromosome pair (which includes Liza aurata , L. ramado, L. saliens , Chelon labrosus and Oedalechilus labeo, A. monticola and M. curema 2n = 28 from Brazil). Finally, in M. rubrioculus and M. trichodon , the single pair of NORs is interstitially located (Nirchio et al., , ). Compared to these species, L. abu from the Tigris River shows a completely different localization of NORs, i.e.…”

Section: Discussionmentioning

confidence: 99%

Karyotype of mulletLiza abuHeckel, 1846 (Pisces: Mugilidae) from the Tigris River, Turkey

Değer

Ünlü

Gaffaroğlu

2012

Journal of Applied Ichthyology

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Karyological characterization of <i>Mugil trichodon</i> Poey, 1876 (Pisces: Mugilidae)

Cited by 8 publications

References 18 publications

Karyotype characterization of Mugil incilis Hancock, 1830 (Mugiliformes: Mugilidae), including a description of an unusual co-localization of major and minor ribosomal genes in the family

Karyotype characterization of Mugil incilis Hancock, 1830 (Mugiliformes: Mugilidae), including a description of an unusual co-localization of major and minor ribosomal genes in the family

Comparative Molecular Cytogenetic Analysis of Two Congeneric Species, Mugil Curema and M. Liza (Pisces, Mugiliformes), Characterized by Significant Karyotype Diversity

Karyotype of mulletLiza abuHeckel, 1846 (Pisces: Mugilidae) from the Tigris River, Turkey

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