Chromosome-scale comparative sequence analysis unravels molecular mechanisms of genome dynamics between two wheat cultivars
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ArticleAuthors
Thind, Anupriya KaurInternational Wheat Genome Sequencing Consortium
Wicker, Thomas
Müller, Thomas

Ackermann, Patrick M.
Steuernagel, Burkhard
Wulff, Brande B. H.
Spannagl, Manuel
Twardziok, Sven O.
Felder, Marius
Lux, Thomas
Mayer, Klaus F. X.
Keller, Beat
Krattinger, Simon G.

Date
2018-08-17Online Publication Date
2018-08-17Print Publication Date
2018-12Permanent link to this record
http://hdl.handle.net/10754/628478
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Recent improvements in DNA sequencing and genome scaffolding have paved the way to generate high-quality de novo assemblies of pseudomolecules representing complete chromosomes of wheat and its wild relatives. These assemblies form the basis to compare the dynamics of wheat genomes on a megabase scale.Here, we provide a comparative sequence analysis of the 700-megabase chromosome 2D between two bread wheat genotypes-the old landrace Chinese Spring and the elite Swiss spring wheat line 'CH Campala Lr22a'. Both chromosomes were assembled into megabase-sized scaffolds. There is a high degree of sequence conservation between the two chromosomes. Analysis of large structural variations reveals four large indels of more than 100 kb. Based on the molecular signatures at the breakpoints, unequal crossing over and double-strand break repair were identified as the molecular mechanisms that caused these indels. Three of the large indels affect copy number of NLRs, a gene family involved in plant immunity. Analysis of SNP density reveals four haploblocks of 4, 8, 9 and 48 Mb with a 35-fold increased SNP density compared to the rest of the chromosome. Gene content across the two chromosomes was highly conserved. Ninety-nine percent of the genic sequences were present in both genotypes and the fraction of unique genes ranged from 0.4 to 0.7%.This comparative analysis of two high-quality chromosome assemblies enabled a comprehensive assessment of large structural variations and gene content. The insight obtained from this analysis will form the basis of future wheat pan-genome studies.Citation
Thind AK, Wicker T, Müller T, Ackermann PM, et al. (2018) Chromosome-scale comparative sequence analysis unravels molecular mechanisms of genome dynamics between two wheat cultivars. Genome Biology 19. Available: http://dx.doi.org/10.1186/s13059-018-1477-2.Sponsors
This study was supported by an Ambizione grant of the Swiss National Science Foundation, the University of Zurich, the BMEL Research grant WheatSeq and by the King Abdullah University of Science and Technology (KAUST).Publisher
Springer NatureJournal
Genome BiologyRelations
Is Supplemented By:- [Dataset]
. DOI: 10.6084/m9.figshare.6978293 HANDLE: 10754/664150
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. DOI: 10.6084/m9.figshare.6978275.v1 HANDLE: 10754/664151
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. DOI: 10.6084/m9.figshare.6978260.v1 HANDLE: 10754/664152
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ae974a485f413a2113503eed53cd6c53
10.1186/s13059-018-1477-2
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