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Ancestral and divergent roles of the Marchantia polymorpha ATR kinase in maintaining genome integrity and clonal fitness.

Li QQ, Li H, De Moor J, Sbrocca I, Xiang Y, Yang SL, Jiang ZY, He L, Wang JY, Herbst J, van de Cotte B, De Smet I, Cimini S, De Veylder L. · 2026 · The Plant cell   research

doi:10.1093/plcell/koag151   PMID:42203494

Linked genes (2)  2 core 0 peripheral

Gene ID	Name	Evidence / Role	Function (this paper)
—	MpATM missing	experimental subject	MpATM (ATAXIA-TELANGIECTASIA MUTATED) acts redundantly with MpATR in the double-strand break response; the Mpatm/atr double mutant shows aggravated clonal growth defects.
—	MpATR missing	experimental subject	MpATR is the M. polymorpha homolog of the ATR kinase, identified and functionally characterized here. It preserves meristematic cells during replication stress and, unlike vascular-plant ATR, is essential for repressing proliferation of differentiated cells; Mpatr mutants show progressively severe growth defects across clonal generations.