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The GENOMES UNCOUPLED1 protein has an ancient, highly conserved role but not in retrograde signalling.

Honkanen, S., et al. · 2022 · New Phytologist   research

doi:10.1111/nph.18318   PMID:35708656   PMC9545484

Linked genes (6)  1 core 5 peripheral

Gene ID	Name	Evidence / Role	Function (this paper)
Mp1g08430	MpPPR_67	experimental subject	Single-copy GUN1 gene studied via two CRISPR deletion lines (Mpgun1) and complementation of Arabidopsis Atgun1. Mpgun1 mutants are indistinguishable from wild-type under nonstress and MpGUN1 is not required for GUN1-type repression of PhANGs, showing the protein has an ancient conserved role but not in retrograde signalling.
—	MpACT missing	experimental tool	Reference gene used alongside MpEF1a for qPCR normalization in M. polymorpha.
Mp3g23400	MpEF1	experimental tool	Reference gene used for qPCR normalization in M. polymorpha.
Mp6g13790	MpFBPase missing	experimental background	PhANG ortholog included in qPCR transcript quantification of photosynthesis-associated genes.
Mp7g06790	MpLHCB2 missing	experimental background	PhANG ortholog whose transcript level was measured by qPCR under plastid stress; reduced response was not GUN1-dependent.
Mp4g10850	MpRBCS missing	experimental background	PhANG ortholog quantified by qPCR; transcripts more abundant in gun1 mutant spores but not under GUN1 control.