Genome-wide gene/genome dosage imbalance regulates gene expressions in synthetic Brassica napus and derivatives (AC, AAC, CCA, CCAA)

ABSTRACT: Gene/genome dosage balance is an essential evolutionary mechanism for organisms to ensure a normal function, but the underlying causes of dosage-imbalance regulation remains poorly understood. Herein, the serial Brassica hybrids/polyploids with different dosages of A and C subgenomes were synthesized to investigate the effects of genome dosages on gene expressions and interaction using RNA-Seq. The expression changes of A- and C-subgenome genes were in accordance with dosage alterations. Dosage-dependent and -independent genes were grouped according to the correlations between dosage variations and gene expressions. Expression levels of dosage-dependent genes were strongly correlated with dosage changes that mainly contributed to dosage effects, while those of dosage-independent genes gave weak correlations with dosage variations that mostly facilitated dosage compensation. More protein–protein interactions were detected for dosage-independent genes than dosage-dependent ones, as predicted by the dosage balance hypothesis. Dosage-dependent genes more likely impacted the expressions by trans effects, whereas dosage-independent genes preferred to play by cis effects. Furthermore, dosage-dependent genes were mainly associated with the basic biological processes to maintain the stability of the growth and development, while dosage-independent genes were more enriched in the stress response related processes to accelerate adaptation. The present comprehensive analysis of gene expression dependent/independent on dosage alterations in Brassica polyploids provided new insights into gene/genome dosage-imbalance regulation of gene expression.

ORGANISM(S): Brassica napus Brassica rapa Brassica oleracea

PROVIDER: GSE81845 | GEO | 2016/05/25

SECONDARY ACCESSION(S): PRJNA322687

REPOSITORIES: GEO