ArticleTAG. Theoretical and applied genetics. Theoretische und angewandte Genetik2020
Improved Brassica oleracea JZS assembly reveals significant changing of LTR-RT dynamics in different morphotypes.
Article in TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 50 papers.
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50 citing papers in PubMed, 91 citations in OpenAlex.
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Corrections and comments
- Erratum issued
Authors and funding
7 authors at 1 institution in 1 country.
Funding
Abstract
Brassica oleracea is an important vegetable crop that has provided ancestor genomes of the two most important Brassica oil crops, Brassica napus and Brassica carinata. The current B. oleracea reference genome (JZS, also named 02-12) displays problems of large mis-assemblies, low sequence continuity, and low assembly integrity, thus limiting genomic analysis. We reported an updated assembly of the B. oleracea reference genome (JZS v2) obtained through single-molecule sequencing and chromosome conformation capture technologies. We assembled an additional 83.16 Mb of genomic sequences, and the updated genome features a contig N50 size of 2.37 Mb, representing an ~ 88-fold improvement. We detected a new round of long terminal repeat retrotransposon (LTR-RT) burst in the new assembly. Comparative analysis with the reported genome sequences of two other genomes of B. oleracea (TO1000 and HDEM) identified extensive gene order and gene structural variation. In addition, we found that the genome-specific amplification of Gypsy-like LTR-RTs occurred around 0-1 million years ago (MYA). In particular, the athila, tat, and Del families were extensively amplified in JZS around 0-1 MYA. Moreover, we identified that the syntenic genes were modified due to the insertion of genome-specific LTR-RTs. These results indicated that the genome-specific LTR-RT dynamics were associated with genome diversification in B. oleracea.
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