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Encodes VCS (VARICOSE). Involved in mRNA decapping. VCS forms a mRNA decapping complex with DCP1 (At1g08370) and DCP2 (At5g13570). Unlike DCP2, VCS itself does not have mRNA decapping activity in vitro. DCP1, DCP2 and VCS colocalize in cytoplasmic loci, which are putative Arabidopsis mRNA processing bodies. Null mutants of DCP1, DCP2, and VCS accumulate capped mRNAs with a reduced degradation rate. These mutants also share a similar lethal phenotype at the seedling cotyledon stage, with disorganized veins, swollen root hairs, and altered epidermal cell morphology. VCS is also required for leaf development.
At early leaf developmental stages, expressed in a spot at the distal end of the organ. As leaf development progresses, present in procambium and differentiating vascular tissues.
As a component of the decapping complex, involved in the degradation of mRNAs. Essential for postembryonic development, especially during the formation of the shoot (SAM) and root apical meristems. Required for normal patterning of internal tissues of leaves.
Present in seedlings, roots, hypocotyls, cotyledons, leaves, stems, shoot apex, siliques and flowers. In leaves, particularly present in trichomes, some stomata and vascular tissues.