Eukaryotic translation initiation factor 4 gamma 1

EIF4G1 (eukaryotic translation initiation factor 4 gamma 1) is a core component of the eIF4F complex, which mediates mRNA cap recognition, 5′-terminal secondary structure unwinding, and ribosome recruitment (UniProt: Q04637). The protein exists in two mutually exclusive complexes—one with EIF1 (promoting leaky scanning) and another with EIF4E (enabling TISU-based start codon location)—and is required for endoplasmic reticulum stress-induced ATF4 translation.

In its non-AD context, EIF4G1 is associated with Parkinson disease 18 (PARK18), an autosomal dominant, late-onset neurodegenerative condition (UniProt: Q04637). The protein functions broadly in translation initiation across tissues expressing the eIF4F machinery.

EIF4G1 is tagged as disease-relevant to Alzheimer's disease with ambiguous directionality (Chaparral AD proteomics). In post-mortem AD brain tissue across subcellular fractions (P2, P3, S2, S3) compared to age-matched controls, EIF4G1 showed a mean log2 fold-change of −0.13, indicating negligible net change with fraction-dependent variation, rendering the overall AD-associated direction ambiguous.