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Evidence for a Robertsonian fusion in Solea senegalensis (Kaup, 1858) revealed by zoo-FISH and comparative genome analysis
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Evidence for a Robertsonian fusion in Solea senegalensis (Kaup, 1858) revealed by zoo-FISH and comparative genome analysis
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Evidence for a Robertsonian fusion in Solea senegalensis (Kaup, 1858) revealed by zoo-FISH and comparative genome analysis
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Journal Article
Evidence for a Robertsonian fusion in Solea senegalensis (Kaup, 1858) revealed by zoo-FISH and comparative genome analysis
2018
Overview
Background
Solea senegalensis
(Kaup, 1858) is a commercially important flatfish species, belonging to the Pleuronectiformes order. The taxonomy of this group has long been controversial, and the karyotype of the order presents a high degree of variability in diploid number, derived from chromosomal rearrangements such as Robertsonian fusions. Previously it has been proposed that the large metacentric chromosome of
S. senegalensis
arises from this kind of chromosome rearrangement and that this is a proto-sex chromosome.
Results
In this work, the Robertsonian origin of the large metacentric chromosome of
S. senegalensis
has been tested by the Zoo-FISH technique applied to two species of the Soleidae family (
Dicologlossa cuneata
and
Dagetichthys lusitanica)
, and by comparative genome analysis with
Cynoglossus semilaevis
. From the karyotypic analysis we were able to determine a chromosome complement comprising 2n = 50 (FN = 54) in
D. cuneata
and 2n = 42 (FN = 50) in
D. lusitanica.
The large metacentric painting probe gave consistent signals in four acrocentric chromosomes of the two Soleidae species; and the genome analysis proved a common origin with four chromosome pairs of
C. semilaevis
. As a result of the genomic analysis, up to 61 genes were annotated within the thirteen Bacterial Artificial Chromosome clones analysed.
Conclusions
These results confirm that the large metacentric chromosome of
S. senegalensis
originated from a Robertsonian fusion and provide new data about the chromosome evolution of
S. senegalensis
in particular, and of Pleuronectiformes in general.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
