Dynamic Proteome Landscape During Preimplantation Human Embryo Development and Trophectoderm Stem...

Area of Science:

• Developmental Biology
• Proteomics
• Human Embryogenesis

Background:

• Genomic and transcriptomic studies illuminate genetic programs in early human development.
• The protein expression landscape during human preimplantation embryo development remains largely unexplored.
• Understanding protein dynamics is crucial for embryogenesis and implantation success.

Purpose of the Study:

• To systematically monitor and analyze the dynamic protein expression landscape during human preimplantation embryo development.
• To investigate protein regulation from the M2 ovum stage through 8-cell and blastocyst stages.
• To characterize lineage-specific proteome reprogramming during trophoblast differentiation into extravillous trophoblasts (EVTs) and syncytiotrophoblast (ST).

Main Methods:

• Quantitative mass spectrometry was employed to analyze protein expression.
• Proteomic profiling was performed on human M2 ovum, 8-cell embryos, blastocysts, and differentiated trophoblast cells (EVTs and ST).
• Proteomic data were correlated with existing transcriptomic data.

Main Results:

• Significant enrichment of metabolic protein networks was observed in proteins temporally regulated from M2 to blastocyst stages.
• 156 proteins were identified as associated with 8-cell to blastocyst development, with 54 showing transcriptomic correlation.
• Key proteins involved in metabolic functions, antioxidant activity, and telomere maintenance were identified, alongside lineage-specific proteome reprogramming in trophoblast stem cells.

Conclusions:

• This study provides the first quantitative, temporal proteomic analysis of early human embryo development.
• It reveals dynamic protein landscape reprogramming critical for embryogenesis and trophoblast function.
• The findings offer a valuable resource for future mechanistic studies on human development and placental formation.