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. Homodimer. Component of the decapping complex. Interacts with DCP2. Present in seedlings, roots, hypocotyls, cotyledons, leaves, stems, shoot apex, siliques and flowers. In leaves, particularly present in trichomes, some stomata and vascular tissues. 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. By auxin. Lethal phenotype at the seedling cotyledon stage that are small and chlorotic, with disorganized veins, swollen root hairs, and altered epidermal cell morphology as well as leaf and shoot apical meristem defects. Altered RNA decay. These phenotypes are suppressed at low temperature. Belongs to the WD repeat EDC4 family.