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Gamete expression of TALE class HD genes activates the diploid sporophyte program in Marchantia polymorpha.

Dierschke, T., et al. · 2021 · eLife   research

doi:10.7554/elife.57088   PMID:34533136   PMC8476127

Linked genes (12)  10 core 2 peripheral

Gene ID Name Evidence / Role Function (this paper)
Mp8g18310 MpBELL1 experimental subject Sole canonical land-plant-type BELL gene in Marchantia, expressed predominantly during sporophyte development.
Mp4g09650 MpBELL2 experimental subject Paternally (antheridia) expressed BELL gene; part of the MpBELL234 group required for the haploid-to-diploid transition.
Mp8g02970 MpBELL3 experimental subject Gamete-expressed BELL gene producing a full-length transcript in antheridia and a shorter single-homeodomain variant in egg cells from distinct promoters.
Mp8g07680 MpBELL4 experimental subject Gamete-expressed BELL gene with a full-length sperm transcript and a shorter egg-cell variant, mirroring MpBELL3.
Mp5g11060 MpBELL5 experimental subject BELL gene with expression restricted to archegoniophores, residing in a phylogenetically distinct GLX-basal clade.
Mp5g01600 MpKNOX1 experimental subject Maternal (egg-expressed) TALE-KNOX gene that is essential for the haploid-to-diploid transition; loss-of-function alleles cause zygotic arrest and fail to activate the sporophyte program.
Mp4g12450 MpKNOX1a experimental subject Sperm/antheridia-expressed MpKNOX1 isoform that conserves the MEINOX domain but lacks the homeodomain.
Mp2g11140 MpKNOX1b experimental subject Antheridia/sperm-expressed MpKNOX1 isoform lacking a homeodomain while retaining the MEINOX domain.
Mp7g05320 MpKNOX2 experimental subject TALE-KNOX gene expressed mainly during sporophyte development rather than in unfertilized reproductive organs.
Mp5g01590 MpSUK1 experimental subject Gene convergently transcribed adjacent to MpKNOX1 and expressed predominantly in antheridia.
Mp1g17210 MpFGMYB citation comparator Cited as a precedent for antisense transcript-mediated, female-specific expression of autosomal genes, paralleling the MpKNOX1/MpBELL5 regulatory mode.
Mp5g18040 MpE(z)1 experimental tool Used as a knockdown transgene/experimental construct serving as a comparison control rather than a focus of study.