Neutral markers confirm the octoploid origin and reveal spontaneous autopolyploidy in white sturgeon, Acipenser transmontanus
Identifieur interne : 000E33 ( Istex/Corpus ); précédent : 000E32; suivant : 000E34Neutral markers confirm the octoploid origin and reveal spontaneous autopolyploidy in white sturgeon, Acipenser transmontanus
Auteurs : A. Drauch Schreier ; D. Gille ; B. Mahardja ; B. MaySource :
- Journal of Applied Ichthyology [ 0175-8659 ] ; 2011-11.
Abstract
The role of polyploidy in vertebrate genome evolution remains a fertile area of research and sturgeons (order Acipenseriformes) provide a unique model of genome duplication, with species possessing ∼120, ∼250 or ∼360 chromosomes. Cytogenetic and molecular data have been used to support different hypotheses about the number of genome duplications in this polyploid series; however, few studies have examined inheritance in sturgeons, although evaluation of polysomic segregation ratios is crucial to inferring ancestral genome duplication level in a polyploid species. Here we examine the inheritance of eight microsatellite loci in fifteen white sturgeon (Acipenser transmontanus) families of known parentage to infer the level of genome duplication. Microsatellites were detected as four or eight copy loci. Numbers of alleles per locus, transmission frequencies of informative alleles, and gene copy numbers in parents reveal an ancient octoploid origin for white sturgeon. Comparison to the lake sturgeon genome suggests the ∼250 chromosome state in sturgeon was achieved by multiple independent polyploid events. The discovery of spontaneous autopolyploids via microsatellite analysis and flow cytometry provides additional evidence of the plasticity of highly duplicated sturgeon genomes.
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DOI: 10.1111/j.1439-0426.2011.01873.x
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Cytogenetic and molecular data have been used to support different hypotheses about the number of genome duplications in this polyploid series; however, few studies have examined inheritance in sturgeons, although evaluation of polysomic segregation ratios is crucial to inferring ancestral genome duplication level in a polyploid species. Here we examine the inheritance of eight microsatellite loci in fifteen white sturgeon (Acipenser transmontanus) families of known parentage to infer the level of genome duplication. Microsatellites were detected as four or eight copy loci. Numbers of alleles per locus, transmission frequencies of informative alleles, and gene copy numbers in parents reveal an ancient octoploid origin for white sturgeon. Comparison to the lake sturgeon genome suggests the ∼250 chromosome state in sturgeon was achieved by multiple independent polyploid events. 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Here we examine the inheritance of eight microsatellite loci in fifteen white sturgeon (Acipenser transmontanus) families of known parentage to infer the level of genome duplication. Microsatellites were detected as four or eight copy loci. Numbers of alleles per locus, transmission frequencies of informative alleles, and gene copy numbers in parents reveal an ancient octoploid origin for white sturgeon. Comparison to the lake sturgeon genome suggests the ∼250 chromosome state in sturgeon was achieved by multiple independent polyploid events. 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E‐mail: <email>amdrauch@ucdavis.edu</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:JAI.JAI1873.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Received: March 30, 2011 Accepted: July 25, 2011</unparsedEditorialHistory><countGroup><count type="figureTotal" number="1"></count><count type="tableTotal" number="4"></count></countGroup><titleGroup><title type="main">Neutral markers confirm the octoploid origin and reveal spontaneous autopolyploidy in white sturgeon, <i>Acipenser transmontanus</i></title><title type="shortAuthors">A. Drauch Schreier et al.</title><title type="short">Neutral markers and ploidy in white sturgeon</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>A.</givenNames><familyName>Drauch Schreier</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>D.</givenNames><familyName>Gille</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a1"><personName><givenNames>B.</givenNames><familyName>Mahardja</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a1"><personName><givenNames>B.</givenNames><familyName>May</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="US"><unparsedAffiliation>Genomic Variation Laboratory, Department of Animal Science, University of California Davis, Davis, CA, USA</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="US"><unparsedAffiliation>Veterinary Genetics Laboratory, University of California Davis, Davis, CA, USA</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Summary</title><p>The role of polyploidy in vertebrate genome evolution remains a fertile area of research and sturgeons (order Acipenseriformes) provide a unique model of genome duplication, with species possessing ∼120, ∼250 or ∼360 chromosomes. Cytogenetic and molecular data have been used to support different hypotheses about the number of genome duplications in this polyploid series; however, few studies have examined inheritance in sturgeons, although evaluation of polysomic segregation ratios is crucial to inferring ancestral genome duplication level in a polyploid species. Here we examine the inheritance of eight microsatellite loci in fifteen white sturgeon (<i>Acipenser transmontanus</i>) families of known parentage to infer the level of genome duplication. Microsatellites were detected as four or eight copy loci. Numbers of alleles per locus, transmission frequencies of informative alleles, and gene copy numbers in parents reveal an ancient octoploid origin for white sturgeon. Comparison to the lake sturgeon genome suggests the ∼250 chromosome state in sturgeon was achieved by multiple independent polyploid events. 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Cytogenetic and molecular data have been used to support different hypotheses about the number of genome duplications in this polyploid series; however, few studies have examined inheritance in sturgeons, although evaluation of polysomic segregation ratios is crucial to inferring ancestral genome duplication level in a polyploid species. Here we examine the inheritance of eight microsatellite loci in fifteen white sturgeon (Acipenser transmontanus) families of known parentage to infer the level of genome duplication. Microsatellites were detected as four or eight copy loci. Numbers of alleles per locus, transmission frequencies of informative alleles, and gene copy numbers in parents reveal an ancient octoploid origin for white sturgeon. Comparison to the lake sturgeon genome suggests the ∼250 chromosome state in sturgeon was achieved by multiple independent polyploid events. 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