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The TRAF Mediated Gametogenesis Progression ( TRAMGaP ) Gene Is Required for Megaspore Mother Cell Specification and Gametophyte Development.
Plant Physiology 2017 November
In plants, the role of TRAF-like proteins with meprin and the TRAF homology (MATH) domain is far from clear. In animals, these proteins serve as adapter molecules to mediate signal transduction from Tumor Necrosis Factor Receptor to downstream effector molecules. A seed-sterile mutant with a disrupted TRAF-like gene ( At5g26290 ) exhibiting aberrant gametogenesis led us to investigate the developmental role of this gene in Arabidopsis ( Arabidopsis thaliana ). The mutation was semidominant and resulted in pleiotropic phenotypes with such features as short siliques with fewer ovules, pollen and seed sterility, altered Megaspore Mother Cell (MMC) specification, and delayed programmed cell death in megaspores and the tapetum, features that overlapped those in other well-characterized mutants. Seed sterility and reduced transmission frequency of the mutant alleles pointed to a dual role, sporophytic and gametophytic, for the gene on the male side. The mutant also showed altered expression of various genes involved in such cellular and developmental pathways as regulation of transcription, biosynthesis and transport of lipids, hormone-mediated signaling, and gametophyte development. The diverse phenotypes of the mutant and the altered expression of key genes related to gametophyte and seed development could be explained based on the functional similarly between At5g26290 and MATH-BTB domain proteins that modulate gene expression through the ubiquitin-mediated proteasome system. These results show a novel link between a TRAF-like gene and reproductive development in plants.
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