Eif4a1-flox Mouse

Eif4a1, a DEAD-box RNA-binding protein, is an essential eukaryotic translation initiation factor. It plays a crucial role in translation initiation by unwinding the secondary structure of mRNA upstream of the start codon, enabling ribosomal recruitment for downstream gene translation [2,4]. It is involved in pathways related to cell proliferation, such as the mTORC1 pathway [2,5,6].

Using mouse models to delete Eif4a1 in B cells, it was found that Eif4a1 is essential for B cell development and the germinal centre response. After B cell activation in vitro, Eif4a1 facilitates an increased rate of protein synthesis, MYC expression, and expression of cell cycle regulators [3]. In triple-negative breast cancer, IGF2BP2 recruits Eif4a1 to promote the translation output of CDK6, driving cell cycle progression [1].

In conclusion, Eif4a1 is vital for translation initiation and significantly impacts cell-related biological processes. Gene-knockout mouse models have revealed its role in B-cell-related processes and in triple-negative breast cancer, providing insights into its function in normal and disease-related conditions.