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Diversification of functional requirements for proteolysis of auxin response factors.

de Roij M, Heijdra E, Lamers J, Nishihama R, Borst JW, Weijers D. · 2026 · Nature communications   research

doi:10.1038/s41467-026-70440-0   PMID:41826301   PMC13128892

Linked genes (6)  2 core 4 peripheral

Gene ID Name Evidence / Role Function (this paper)
Mp1g12750 MpARF1 experimental subject Activating A-class auxin response factor. This study showed MpARF1 shares the conserved arginine-dependent degradation mechanism with MpARF2, but stabilizing MpARF1 had little effect on development or auxin response, so its proteolysis is functionally dispensable.
Mp4g11820 MpARF2 experimental subject Repressive B-class auxin response factor and the core focus of the study. The authors found MpARF2 degradation occurs across all developmental stages and that its stabilization severely impairs development and auxin response throughout the Marchantia lifecycle, showing proteolysis is critically required for its function.
MpHSP missing experimental tool Heat-shock promoter used to drive the inducible Cre-GR recombinase in the floxed conditional expression system.
MpUBE2 missing experimental tool Used as a constitutive promoter (proMpUBE2) to drive transgene expression.
Mp1g07070 MpARF3 experimental background C-class auxin response factor; mentioned as one of the three single-copy ARF families in Marchantia, not functionally studied here.
Mp6g05000 MpIAA experimental background Aux/IAA gene examined in RNA-seq; found not differentially expressed when assessing transcriptional feedback regulation.