Proteomic Analysis of Mammalian Oocyte and Embryo Development

Proteomic analysis has transformed understanding of oocyte maturation and early embryogenesis by enabling high-resolution profiling of thousands of proteins across developmental stages. Studies in model mammals have charted the dynamic landscape of maternal and zygotic proteomes, revealing stage-specific cohorts of factors that orchestrate meiosis, maternal-to-zygotic transition and blastocyst formation. Advances in mass spectrometry and quantitative labelling techniques such as iTRAQ and TMT have uncovered shifts in translational machinery, cytoskeletal components, metabolic enzymes and ubiquitin–proteasome effectors. Integration with transcriptomic data has illuminated post-transcriptional regulation, highlighting discordance between mRNA abundance and protein levels in early cleavage stages. Comparative analyses across species have identified conserved maternal effect proteins underpinning chromatin remodelling, vesicular trafficking and energy metabolism, with implications for reproductive technologies and developmental competence. Emerging proteomic atlases provide global resources for marker discovery and mechanistic insight, paving the way for targeted interventions in fertility treatments and livestock breeding.

Research from Nature Portfolio

Recent proteomic and multi-omics efforts have quantified over 6 500 proteins across seven preimplantation stages in mouse, demonstrating that most proteome remodelling occurs between morula and blastocyst despite early transcriptome shifts. Gradually increasing concordance between mRNA and protein levels from the two-cell stage onwards highlights the role of cytoplasmic lattice-to-free ribosome transition in translational control. Complementary analyses in buffalo oocytes using iTRAQ identified 3 763 proteins at germinal vesicle and metaphase II stages, revealing 173 differentially abundant proteins associated with chromosome segregation, energy metabolism and protein transport that correlate with developmental competence. Further mechanistic insight has been provided by the study of a key maternal effect factor, DPPA3, whose partial proteasomal cleavage generates an N-terminal fragment essential for vesicular trafficking and blastocyst formation. Together, these foundational datasets establish a temporal atlas of proteomic dynamics underlying mammalian oocyte maturation and early embryogenesis.

Proteomic Analysis of Mammalian Oocyte and Embryo Development publication trend

The graph below shows the total number of articles in proteomic analysis of mammalian oocyte and embryo development across all publications each year (not limited to Nature Index journals).

Technical terms

Proteome: The complete set of proteins expressed in a cell or organism at a given time.

Mass spectrometry: An analytical technique that measures the mass-to-charge ratio of ionised particles to identify and quantify molecules in a sample.

Tandem mass tag (TMT) labelling: A quantitative proteomic method using isobaric chemical tags to compare protein abundance across multiple samples.

Isobaric tags for relative and absolute quantification (iTRAQ): A mass spectrometry-based technique that employs isobaric reagents to label peptides for multiplexed protein quantification.

Maternal-to-zygotic transition (MZT): The developmental period during which control shifts from maternally deposited mRNAs and proteins to zygotic genome activation.

Ubiquitin–proteasome system (UPS): A cellular pathway that tags proteins with ubiquitin for targeted degradation by the proteasome.

Cytoplasmic lattices: Specialized ribonucleoprotein structures in early embryos that modulate translational competence.

Germinal vesicle stage: The immature oocyte stage characterised by an intact nuclear envelope prior to meiotic resumption.

References

1. An integrated genome-wide multi-omics analysis of gene expression dynamics in the preimplantation mouse embryo. Scientific Reports (2019).
2. Comparative Proteomic Analysis of Buffalo Oocytes Matured in vitro Using iTRAQ Technique. Scientific Reports (2016).
3. Cytoplasmic cleavage of DPPA3 is required for intracellular trafficking and cleavage-stage development in mice. Nature Communications (2017).
4. Proteomics Analysis Reveals that Warburg Effect along with Modification in Lipid Metabolism Improves In Vitro Embryo Development under Low Oxygen. International Journal of Molecular Sciences (2020).
5. Integrated Analysis of Quantitative Proteome and Transcriptional Profiles Reveals the Dynamic Function of Maternally Expressed Proteins After Parthenogenetic Activation of Buffalo Oocyte*. Molecular & Cellular Proteomics (2018).