PCBP1 orchestrates amino acid metabolism burst during the naïve-to-primed pluripotency transition

Area of Science:

• Developmental Biology
• Molecular Biology
• Epigenetics

Background:

• Embryo implantation requires epiblast cells to transition from naive to primed pluripotency.
• This transition involves increased proliferation and anabolic activity for rapid embryo growth.
• The molecular regulators of this critical developmental stage remain incompletely understood.

Purpose of the Study:

• To investigate the role of Poly(rC)-binding protein 1 (Pcbp1) in the naive-to-primed pluripotency transition.
• To elucidate the molecular mechanisms by which Pcbp1 influences early embryonic development and growth.

Main Methods:

• Generation and analysis of Pcbp1 knockout mouse models.
• In vitro modeling of the naive-to-primed pluripotency transition using Pcbp1-deficient cells.
• Multi-omics approaches (transcriptomics, proteomics, metabolomics) to analyze cellular changes.

Main Results:

• Pcbp1 knockout embryos exhibit growth arrest shortly after implantation.
• Pcbp1 deficiency in vitro impairs cell proliferation and induces apoptosis during pluripotency transition.
• PCBP1 is crucial for upregulating genes involved in amino acid import and de novo synthesis.
• PCBP1 deficiency leads to reduced protein biosynthesis rates.

Conclusions:

• PCBP1 plays an essential role in supporting the anabolic boost required for early embryonic growth.
• The protein is critical for regulating amino acid metabolism and protein synthesis during pluripotency.
• Impaired protein biosynthesis due to PCBP1 deficiency explains the early lethality observed in knockout embryos.