The Chromosomal Distribution of Microsatellite Repeats in the Genome of the Wolf Fish Hoplias malabaricus, Focusing on the Sex Chromosomes

Distribution of 12 mono-, di- and tri-nucleotide microsatellites on the chromosomes of 2 karyomorphs with 2 distinct sex chromosome systems (a simple XX/XY – karyomorph B and a multiple X 1 X 1 X 2 X 2 /X 1 X 2 Y – karyomorph D) in Hoplias malabaricus, commonly referred to as wolf fish, was studied...

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Published inCytogenetic and genome research Vol. 132; no. 4; pp. 289 - 296
Main Authors Cioffi, M.B., Kejnovsky, E., Bertollo, L.A.C.
Format Journal Article
LanguageEnglish
Published Basel, Switzerland S. Karger AG 01.02.2011
Subjects
Animals
Centromere - genetics
Chromosome Mapping
Female
Fishes - genetics
Genome
Hoplias malabaricus
In Situ Hybridization, Fluorescence
Male
Microsatellite Repeats - genetics
Original Article
Telomere - genetics
X Chromosome - genetics
Y Chromosome - genetics
Microsatellites
Fluorescence in situ hybridization
Fish sex chromosomes
Hoplias malabaricus
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Summary:Distribution of 12 mono-, di- and tri-nucleotide microsatellites on the chromosomes of 2 karyomorphs with 2 distinct sex chromosome systems (a simple XX/XY – karyomorph B and a multiple X 1 X 1 X 2 X 2 /X 1 X 2 Y – karyomorph D) in Hoplias malabaricus, commonly referred to as wolf fish, was studied using their physical mapping with fluorescence in situ hybridization (FISH). The distribution patterns of different microsatellites along the chromosomes varied considerably. Strong hybridization signals were observed at subtelomeric and heterochromatic regions of several autosomes, with a different accumulation on the sex chromosomes. A massive accumulation was found in the heterochromatic region of the X chromosome of karyomorph B, whereas microsatellites were gathered at centromeres of both X chromosomes as well as in corresponding regions of the neo-Y chromosome in karyomorph D. Our findings are likely in agreement with models that predict the accumulation of repetitive DNA sequences in regions with very low recombination. This process is however in contrast with what was observed in multiple systems, where such a reduction might be facilitated by the chromosomal rearrangements that are directly associated with the origin of these systems.
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ISSN:1424-8581
1424-859X
DOI:10.1159/000322058