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Coalescent-based an...
Coalescent-based analysis distinguishes between allo- and autopolyploid origin in shepherd’s purse (Capsella bursa-pastoris)
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- St Onge, Kate, 1982- (författare)
- Uppsala universitet,Växtekologi och evolution
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- Foxe, John Paul (författare)
- Department of Biology, York University
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- Li, Junrui (författare)
- Laboratory of Evolutionary Genomics, CAS-MPG Partner Institute for Computational Biology, Chinese Academy of Sciences
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- Li, Haipeng (författare)
- Laboratory of Evolutionary Genomics, CAS-MPG Partner Institute for Computational Biology, Chinese Academy of Sciences
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- Holm, Karl (författare)
- Uppsala universitet,Växtekologi och evolution
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- Corcoran, Pádraic (författare)
- Uppsala universitet,Evolutionsbiologi
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- Tanja, Slotte (författare)
- Uppsala universitet,Evolutionsbiologi
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- Lascoux, Martin (författare)
- Uppsala universitet,Växtekologi och evolution
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- Stephen, Wright (författare)
- Department of Ecology and Evolutionary Biology, University of Toronto
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(creator_code:org_t)
- 2012-01-27
- 2012
- Engelska.
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Ingår i: Molecular biology and evolution. - : Oxford University Press (OUP). - 0737-4038 .- 1537-1719. ; 29:7, s. 1721-1733
- Relaterad länk:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Polyploidization plays an important role in plant speciation. The most recent estimates 36 report that up to 15% of angiosperm speciation events and 31% in ferns are accompanied 37 by changes in ploidy level. Polyploids can arise either through autopolyploidy, when the 38 sets of chromosomes originate from a single species, or through allopolyploidy, when 39 they originate from different species. In this study we used two different coalescent-based 40 methods to determine the date and mode of the polyploidization event that led to the 41 tetraploid cosmopolitan weed, Capsella bursa-pastoris. We sampled 78 C. bursa-pastoris 42 accessions, and 53 and 43 accessions from the only two other members of this genus, C. 43 grandiflora and C. rubella, respectively, and sequenced these accessions at 14 unlinked 44 nuclear loci with locus-specific primers in order to be able to distinguish the two 45 homeologues in the tetraploid. A large fraction of fixed differences between 46 homeologous genes in C. bursa-pastoris are segregating as polymorphisms in C. 47 grandiflora, consistent with an autopolyploid origin followed by disomic inheritance. To 48 test this, we first estimated the demographic parameters of an isolation-with-migration 49 model in a pairwise fashion between C. grandiflora and both genomes of C. bursa- 50 pastoris and used these parameters in coalescent simulations to test the mode of origin of 51 C. bursa-pastoris. Secondly we used Approximate Bayesian Computation to compare an 52 allopolyploid and an autopolyploid model. Both analyses led to the conclusion that C. 53 bursa-pastoris originated less than one million years ago by doubling of the C. 54 grandiflora genome.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Nyckelord
- autopoplyploidy
- coalescent
- Brassicaceae
- Approximate bayesian computation
- IM model
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- art (ämneskategori)
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St Onge, Kate, 1 ...
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Foxe, John Paul
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Li, Junrui
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Li, Haipeng
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Holm, Karl
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Corcoran, Pádrai ...
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visa fler...
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Tanja, Slotte
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Lascoux, Martin
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Stephen, Wright
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visa färre...
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Molecular biolog ...
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Uppsala universitet