Spatiotemporal dynamics and selectivity of mRNA translation during mouse pre-implantation development

Area of Science:

• Molecular Biology
• Developmental Biology
• Genetics

Background:

• Translational regulation is critical for pre-implantation development.
• Mechanisms of messenger RNA (mRNA) regulation during this period are not fully understood.

Purpose of the Study:

• To characterize the dynamics of mRNA translation during mammalian oocyte and early embryo development.
• To uncover novel modes of translational selectivity and identify key regulatory factors.

Main Methods:

• Fraction-resolved polysome profiling to analyze translational dynamics.
• Comparative analysis of translatome, proteomics, and RNA modifications (N6-methyladenosine).

Main Results:

• Observed stage-specific delays in mRNA translation, with postponed recruitment to polysomes.
• Identified coordinated and distinct regulatory mechanisms governing translation.
• Discovered Eif1ad3, a translation initiation factor exclusively translated at the two-cell stage, essential for embryonic development.

Conclusions:

• Provides a high-resolution map of spatiotemporal translational regulation in early mammalian embryos.
• Highlights the critical role of Eif1ad3 in regulating ribosome biogenesis and protein synthesis for embryonic development.