2017
DOI: 10.1186/s12863-017-0484-8
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Molecular cytogenetic differentiation of paralogs of Hox paralogs in duplicated and re-diploidized genome of the North American paddlefish (Polyodon spathula)

Abstract: Background: Acipenseriformes is a basal lineage of ray-finned fishes and comprise 27 extant species of sturgeons and paddlefishes. They are characterized by several specific genomic features as broad ploidy variation, high chromosome numbers, presence of numerous microchromosomes and propensity to interspecific hybridization. The presumed palaeotetraploidy of the American paddlefish was recently validated by molecular phylogeny and Hox genes analyses. A whole genome duplication in the paddlefish lineage was es… Show more

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Cited by 25 publications
(39 citation statements)
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References 52 publications
(94 reference statements)
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“…Sturgeons are a group of rayfinned fish that diverged from the actinopterygian stem before the teleost-specific 3R duplication and after the ancient 2R event 4,5 . After their divergence from the other ray-finned fish, the various lineages of Acipenseriformes (sturgeon and paddlefish) experienced several polyploidization events 6 , resulting in karyotypes, comprising between ~120 chromosomes in some species, and ~360 chromosomes in species that are considered dodecaploid 7 . The genomic basis for this parallelism between basal and derived fish lineages to acquire WGDs is not clear.…”
mentioning
confidence: 99%
“…Sturgeons are a group of rayfinned fish that diverged from the actinopterygian stem before the teleost-specific 3R duplication and after the ancient 2R event 4,5 . After their divergence from the other ray-finned fish, the various lineages of Acipenseriformes (sturgeon and paddlefish) experienced several polyploidization events 6 , resulting in karyotypes, comprising between ~120 chromosomes in some species, and ~360 chromosomes in species that are considered dodecaploid 7 . The genomic basis for this parallelism between basal and derived fish lineages to acquire WGDs is not clear.…”
mentioning
confidence: 99%
“…The association of GC-rich DNA type of heterochromatin with rDNA sites is present in lower and higher teleostean groups, suggesting that it is evolutionarily conserved among teleosts ( Gornung 2013 ). However, this character exits also in bichirs ( Polypteriformes ), partly in paddlefishes ( Symonová et al 2017a ), gars ( Symonová et al 2017b ) and bowfin ( Majtánová et al 2017 ), but not in sturgeons ( Fontana et al 2007 ). Among Cobitis loaches, this characteristic pattern was found in C. vardarensis Karaman, 1928 ( Rábová et al 2001 ), C. elongatoides Băcescu et Mayer, 1969 ( Ráb et al 2000 ) and C. taenia Linnaeus, 1758 ( Boroň et al 2006 ), i.e.…”
Section: Discussionmentioning
confidence: 99%
“…However, to sequence and above all to assemble such genomes remains challenging (bichirs, lungfishes, sturgeons, salamanders). Hence, the “classical” cytogenetics still represents an important tool to analyze these genomes and the post-WGD evolution [ 20 , 89 , 108 ]. Not only in these cases, cytogenetics can largely benefit from genomics and bioinformatics and compensate for the obstacles during sequencing and genome assembling ([ 19 ], this special issue).…”
Section: Fish Cytogenomics—practical Application Of Integrated Cytmentioning
confidence: 99%