Transcriptomic shock generates evolutionary novelty in a newly formed, natural allopolyploid plant.

New hybrid species might be expected to show patterns of gene expression intermediate to those shown by parental species. "Transcriptomic shock" may also occur, in which gene expression is disrupted; this may be further modified by whole genome duplication (causing allopolyploidy). "Shock" can include instantaneous partitioning of gene expression between parental copies of genes among tissues. These effects have not previously been studied at a population level in a natural allopolyploid plant species. Here, we survey tissue-specific expression of 144 duplicated gene pairs derived from different parental species (homeologs) in two natural populations of 40-generation-old allotetraploid Tragopogon miscellus (Asteraceae) plants. We compare these results with patterns of allelic expression in both in vitro "hybrids" and hand-crossed F(1) hybrids between the parental diploids T. dubius and T. pratensis, and with patterns of homeolog expression in synthetic (S(1)) allotetraploids. Partitioning of expression was frequent in natural allopolyploids, but F(1) hybrids and S(1) allopolyploids showed less partitioning of expression than the natural allopolyploids and the in vitro "hybrids" of diploid parents. Our results suggest that regulation of gene expression is relaxed in a concerted manner upon hybridization, and new patterns of partitioned expression subsequently emerge over the generations following allopolyploidization.

Buggs RJ ，Zhang L ，Miles N ，Tate JA ，Gao L ，Wei W ，Schnable PS ，Barbazuk WB ，Soltis PS ，Soltis DE ... -  《-》

Characterization of duplicate gene evolution in the recent natural allopolyploid Tragopogon miscellus by next-generation sequencing and Sequenom iPLEX MassARRAY genotyping.

Buggs RJ ，Chamala S ，Wu W ，Gao L ，May GD ，Schnable PS ，Soltis DE ，Soltis PS ，Barbazuk WB ... -  《-》

Homeolog loss and expression changes in natural populations of the recently and repeatedly formed allotetraploid Tragopogon mirus (Asteraceae).

Koh J ，Soltis PS ，Soltis DE 《BMC GENOMICS》

On the origins of species: does evolution repeat itself in polyploid populations of independent origin?

Soltis DE ，Buggs RJ ，Barbazuk WB ，Schnable PS ，Soltis PS ... -  《-》

Gene loss and silencing in Tragopogon miscellus (Asteraceae): comparison of natural and synthetic allotetraploids.

Buggs RJ ，Doust AN ，Tate JA ，Koh J ，Soltis K ，Feltus FA ，Paterson AH ，Soltis PS ，Soltis DE ... -  《-》