DNA Content and Chromosome Complement of<i>Chromis Chromis</i>(Pommacentridae, Perciformes)

Alvarez, M. C.; Cano, J.; Thode, G.

doi:10.1080/00087114.1980.10796839

Cited by 18 publications

(12 citation statements)

References 16 publications

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“…Previous studies of the genus Chromis revealed that C. chromis had 2n = 48 and FN = 48 (Alvarez et al, 1980), C. chrysura had 2n = 48 and FN = 50, and C. caerulea had 2n = 48 and FN = 48 (Ojima and Kashiwagi, 1981), indicating the occurrence of a highly conserved karyotype among these fishes. The reduction in chromosome number and the presence of distinctive metacentric chromosomes in C. insolata and C. flavicauda may have resulted from centric fusions.…”

Section: Discussionmentioning

confidence: 99%

Robertsonian rearrangements in the reef fish Chromis (Perciformes, Pomacentridae) involving chromosomes bearing 5s rRNA genes

Molina

Galetti-Jr

2002

Genet. Mol. Biol.

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Cytogenetic studies were done on three Pomacentridae species of the genus Chromis. The karyotype of C. multilineata consisted of 48 acrocentric chromosomes (FN = 48), C. insolata had 2n = 46-47 (3-4M+6SM+36-38A; FN = 56) and C. flavicauda had 2n = 39 (9M+6SM+24A; FN = 54). Robertsonian polymorphisms were detected in C. insolata and C. flavicauda. All three species had small heterochromatic blocks restricted to centromeric regions. Nucleolar organizer regions (NORs) were detected in the telomeric position of a medium acrocentric chromosome pair in C. multilineata and in non-homologous chromosomes in both C. flavicauda and C. insolata. FISH with a telomeric probe detected no internal telomeric sequences in C. flavicauda and C. insolata. 5S rRNA genes were observed in a pericentromeric region of two large metacentric chromosome pairs in C. flavicauda and two large acrocentric pairs in C. insolata. The karyotype structure and the number and location of the 5S rDNA loci in these two species indicated that the 5S rRNA-bearing acrocentric chromosomes were directly involved in the origin of the polymorphisms observed. These data reinforce the idea that Robertsonian rearrangements have been involved in molding the karyotype in the subfamily Chrominae.

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Section: Discussionmentioning

confidence: 99%

Robertsonian rearrangements in the reef fish Chromis (Perciformes, Pomacentridae) involving chromosomes bearing 5s rRNA genes

Molina

Galetti-Jr

2002

Genet. Mol. Biol.

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“…968;Alvarez et al, 1980;Rab, 1982). Several members of this family have been karyotyped by conservative Giemsa staining (Nygren et al, !…”

Section: Introductionmentioning

confidence: 99%

Localisation of NORs and counterstain-enhanced fluorescence studies inPerca fluviatilis (Pisces, Percidae)

1985

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The karyotype of the perch (Percafluviatilis L.) was analysed by means of silver-staining, the chromomycin A3/Distamycin A/DAPI and Actinomycin D fluorescence technique in order to locate active NORs and to selectively highlight certain heterochromatic regions. The ribosomal RNA genes are localized at the secondary constrictions of the short arms of chromosomes no. 16. Additionally, bright chromomycin fluorescence was observed in the same regions. No DAPI/Distamycin A bright heterochromatic block was detected in the perch karyotype. I:~,. I. Sequential Ag-CDD-DAPI Actinomycin D staining of a lymphocyte metaphase of a male perch: (a) Ag-NOR-staining, note two Ag-NORs on two chromosomes no. 16: (bJChromomycinstaining. note brilliant chromomycin fluorescence associated with NOR regions: {c) DAPI Distamycin A. notelack of differentially stained fluorescence block,: Id) DAPl'Actinomycin Dstaining.

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“…A karyotype with 2n = 48 and FN = 48, considered ancestral in the group, has been observed in only a few species, such as Pomacentrus coelestis , Chromis chromis (Alvarez et al, 1980) and C. multilineata (Molina and Galetti, 2002). Some representatives of the subfamily Chrominae show marked numerical polymorphism in their chromosomes while maintaining the number of chromosomal arms.…”

Section: Discussionmentioning

confidence: 99%

Multiple pericentric inversions and chromosomal divergence in the reef fishes Stegastes (Perciformes, Pomacentridae)

Molina

Galetti

2004

Genet. Mol. Biol.

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Damselfishes (Pomacentridae, Perciformes) occur in all major oceans of the world and, with approximately 320 species, represent one of the most diverse families of marine Teleostei. The taxonomy of these reef fishes is problematic because of the large number of complex species and the range of color patterns they display, which vary among individuals and populations of the same species. In this study, we examined the cytogenetic composition of four species of Stegastes (S. pictus, S. fuscus, S. variabilis and S. leucostictus) found along the coast of Brazil. Stegastes pictus had a chromosomal number of 2n = 48 (14m+28sm+2st+4a, fundamental number (FN) = 92), S. fuscus had 2n = 48 (20m+22sm+6a, FN = 90), S. variabilis had 2n = 48 (18m+22sm+8a, FN = 88), and S. leucostictus had 2n = 48, (18m+22sm+8a, FN = 88). The nucleolar organizing regions were single and homologous in all of the species, and were located in the interstitial region on the short arm of the first submetacentric pair. The heterochromatin segments were reduced in size and were distributed conservatively over the centromeric and pericentromeric regions of most of the chromosomes. The marked divergence in the number of chromosomal arms, compared to other Perciformes (2n = 48, FN = 48), indicated that varying degrees of multiple pericentric inversions had occurred during the karyotypic evolution of the Pomacentridae. Subtle karyotypic differences between S. variabilis and S. leucostictus suggested a recent divergence or that their karyotypes were less susceptible to changes. These results indicate that cytogenetic analyses could provide important complementary data for the characterization of populations and species of Stegastes and damselfishes in general.

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DNA Content and Chromosome Complement ofChromis Chromis(Pommacentridae, Perciformes)

Cited by 18 publications

References 16 publications

Robertsonian rearrangements in the reef fish Chromis (Perciformes, Pomacentridae) involving chromosomes bearing 5s rRNA genes

Robertsonian rearrangements in the reef fish Chromis (Perciformes, Pomacentridae) involving chromosomes bearing 5s rRNA genes

Localisation of NORs and counterstain-enhanced fluorescence studies inPerca fluviatilis (Pisces, Percidae)

Multiple pericentric inversions and chromosomal divergence in the reef fishes Stegastes (Perciformes, Pomacentridae)

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