当前位置： SCI文献检索 > Molecular Cytogenetics期刊下所有文献 > Cytogenetic analysis in the neotropical fish Astyanax goyacensis Eigenmann, 1908 (Characidae, incertae sedis): karyotype description and occurrence of B microchromosomes.

Cytogenetic analysis in the neotropical fish Astyanax goyacensis Eigenmann, 1908 (Characidae, incertae sedis): karyotype description and occurrence of B microchromosomes.

Abstract：

BACKGROUND:B chromosomes, also known as supernumerary or accessory chromosomes, are additional chromosomes over the standard complement found in various groups of plants and animals. We investigated the presence of, and characterized, supernumerary microchromosomes in Astyanax goyacensis using classical and molecular cytogenetic methods. FINDINGS:Three specimens possessed 2n = 50 chromosomes (8m + 26sm + 8st + 8a), and two specimens contained 1 to 9 additional B microchromosomes varying intra- and inter-individually. Chromosome painting with a B chromosome-specific probe yielded signals for several B microchromosomes, with one exhibiting no markings. Acrocentric chromosomes of the standard complement were also painted. Fluorescence in situ hybridization (FISH) using ribosomal probes located two chromosome pairs carrying 18S rDNA marked on the short arm, and one pair carrying 5S rDNA with pericentromeric markings. One chromosome was observed in synteny with 18S cistrons. CONCLUSION:These data contribute to knowledge of the karyotype evolution, the origin of B chromosomes, and to an understanding of the functionality of rDNA.

journal_name

Mol Cytogenet

journal_title

Molecular cytogenetics

authors

Dos Santos LP,Castro JP,Francisco CM,Vicari MR,de Almeida MC,Goll LG,Morelli S,Artoni RF

doi

10.1186/1755-8166-6-48

subject

Has Abstract

pub_date

2013-11-05 00:00:00

pages

48

issue

1

issn

1755-8166

pii

1755-8166-6-48

journal_volume

6

pub_type

杂志文章

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