As a component of the decapping complex, involved in the degradation of mRNAs. Essential for postembryonic development. Homodimer. Component of the decapping complex. Interacts with DCP2 and DCP5 (PubMed:17158604, PubMed:19855049). Interacts with BCHA1 (PubMed:26133670). Expressed in seedlings, mostly in root tips, root hairs, and the vascular system. Also present in roots, leaves, stems, and flowers. Gradually accumulates during seed maturation to reached maximum levels in dry seeds. Fades progressively upon germination. Lethal phenotype at the seedling cotyledon stage, with disorganized veins, swollen root hairs, and altered epidermal cell morphology. Belongs to the DCP1 family.