EIF4ENIF1 encodes the eukaryotic translation initiation factor 4E nuclear import factor 1 (4E-T), which plays critical roles in post-transcriptional regulation of mRNA translation and stability. The protein functions as a translation repressor that regulates mRNA storage in processing bodies (P-bodies) and prevents mRNA degradation 1. EIF4ENIF1 acts as a binding platform for RNA-binding proteins, promoting mRNA deadenylation through interaction with the CCR4-NOT complex while blocking decapping via eIF4E interaction, thereby protecting repressed mRNAs from degradation 1. The protein is essential for P-body formation and miRNA-mediated translational repression 1. Clinical relevance is demonstrated through its association with premature ovarian insufficiency (POI), where heterozygous mutations cause subfertility and impaired oocyte maturation 23. Multiple studies have identified EIF4ENIF1 variants in POI patients, with functional analysis showing these mutations exhibit impaired translation regulation abilities 45. The protein also regulates tissue-specific translation machinery composition and plays roles in angiogenesis through alternative splicing mechanisms 67. EIF4ENIF1 haploinsufficiency leads to altered mitochondrial dynamics in oocytes and disrupted early embryonic development, highlighting its importance in reproductive biology 2.