Evidence of hexaploid karyotype in shortnose sturgeon.
Identifieur interne : 000A40 ( Main/Exploration ); précédent : 000A39; suivant : 000A41Evidence of hexaploid karyotype in shortnose sturgeon.
Auteurs : Francesco Fontana [Italie] ; Leonardo Congiu ; Vincent A. Mudrak ; Joseph M. Quattro ; Theodore I J. Smith ; Kent Ware ; Serge I. DoroshovSource :
- Genome [ 0831-2796 ] ; 2008.
English descriptors
- KwdEn :
- MESH :
- chemical , genetics : DNA, Ribosomal.
- genetics : Fishes.
- Animals, Gene Duplication, Genome, Karyotyping, Mitosis, Nucleic Acid Hybridization, Polyploidy.
Abstract
A karyotype analysis by several staining techniques was carried out on triplicate samples of the shortnose sturgeon, Acipenser brevirostrum. The chromosome number was found to be 2n = 372 +/- 6. A representative karyotype of 374 chromosomes was composed of 178 metacentrics/submetacentrics and 196 telocentrics/acrocentrics and microchromosomes. The signals of fluorescent in situ hybridization (FISH) with a HindIII satellite DNA probe were visible on 14 chromosomes. The signals obtained with a PstI satellite DNA probe appeared on 12 chromosomes. The FISH with a 5S rDNA probe revealed fluorescent signals on 6 chromosomes. These last results, compared with 2 signals in species with about 120 chromosomes and 4 in species with 240, support the hypothesis that A. brevirostrum is a hexaploid species, probably of hybrid origin. Based on these results, we propose a model explaining speciation events occurring in sturgeons by hybridization, genome duplication, and diploidization.
DOI: 10.1139/g07-112
PubMed: 18356945
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en">A karyotype analysis by several staining techniques was carried out on triplicate samples of the shortnose sturgeon, Acipenser brevirostrum. The chromosome number was found to be 2n = 372 +/- 6. A representative karyotype of 374 chromosomes was composed of 178 metacentrics/submetacentrics and 196 telocentrics/acrocentrics and microchromosomes. The signals of fluorescent in situ hybridization (FISH) with a HindIII satellite DNA probe were visible on 14 chromosomes. The signals obtained with a PstI satellite DNA probe appeared on 12 chromosomes. The FISH with a 5S rDNA probe revealed fluorescent signals on 6 chromosomes. These last results, compared with 2 signals in species with about 120 chromosomes and 4 in species with 240, support the hypothesis that A. brevirostrum is a hexaploid species, probably of hybrid origin. Based on these results, we propose a model explaining speciation events occurring in sturgeons by hybridization, genome duplication, and diploidization.</div>
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