Biased gene fractionation and dominant gene expression among the subgenomes of Brassica rapa.

PloS One
Feng ChengXiaowu Wang

Abstract

Polyploidization, both ancient and recent, is frequent among plants. A "two-step theory" was proposed to explain the meso-triplication of the Brassica "A" genome: Brassica rapa. By accurately partitioning of this genome, we observed that genes in the less fractioned subgenome (LF) were dominantly expressed over the genes in more fractioned subgenomes (MFs: MF1 and MF2), while the genes in MF1 were slightly dominantly expressed over the genes in MF2. The results indicated that the dominantly expressed genes tended to be resistant against gene fractionation. By re-sequencing two B. rapa accessions: a vegetable turnip (VT117) and a Rapid Cycling line (L144), we found that genes in LF had less non-synonymous or frameshift mutations than genes in MFs; however mutation rates were not significantly different between MF1 and MF2. The differences in gene expression patterns and on-going gene death among the three subgenomes suggest that "two-step" genome triplication and differential subgenome methylation played important roles in the genome evolution of B. rapa.

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Citations

Dec 4, 2013·Molecular Biology and Evolution·Olivier GarsmeurMichael Freeling
Apr 8, 2014·Proceedings of the National Academy of Sciences of the United States of America·Margaret R WoodhouseXiaowu Wang
Jun 5, 2014·BMC Genomics·Ning GuoXiaowu Wang
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Methods Mentioned

BETA
gene

Software Mentioned

SOAP2
Samtools

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