Key component of the 4EHP-GYF2 complex, a multiprotein complex that acts as a repressor of translation initiation (PubMed:26763119). In the 4EHP-GYF2 complex, acts as a factor that bridges EIF4E2 to ZFP36/TTP, linking translation repression with mRNA decay (PubMed:26763119). Also recruits and bridges the association of the 4EHP complex with the decapping effector protein DDX6, which is required for the ZFP36/TTP-mediated down-regulation of AU-rich mRNA (By similarity). May act cooperatively with GRB10 to regulate tyrosine kinase receptor signaling, including IGF1 and insulin receptors (PubMed:12771153). Component of the 4EHP-GYF2 complex, at least composed of EIF4E2, GIGYF2 and ZNF598 (PubMed:26763119). Interacts (via the 4EHP-binding motif) with EIF4E2; the interaction is direct (By similarity). Interacts with ZFP36/TTP (via P-P-P-P-G repeats); the interaction is direct (PubMed:26763119). Interacts with GRB10 (PubMed:12771153). Interacts (via DDX6 motif) with DDX6 (via RecA-like domain 2) (By similarity). Expressed in heart, liver, kidney and brain as well as in testis (PubMed:12771153). Widely expressed in embryonic tissues, including strong expression in the central nervous system. Mice undergo normal embryonic development, but fail to feed and die within the first 2 postnatal days. Heterozygous mice survive to adulthood with no evident metabolic or growth defects. At 12-15 months of age, heterozygous mice show motor dysfunction associated with histopathologic evidence of neurodegeneration and rare intracytoplasmic Lewy body-like inclusions in spinal anterior horn motor neurons. Belongs to the GIGYF family.