Embryonic Development Dynamics in Bovine Systems
Summary
Early bovine embryogenesis unfolds through a tightly orchestrated series of morphological and molecular events that transform a totipotent zygote into a differentiated blastocyst poised for implantation. Following fertilisation, the embryo undergoes cleavage divisions, compaction and the first lineage decision, which segregates the trophectoderm—the precursor of extra-embryonic tissues—from the inner cell mass, the source of the foetus. These processes are governed by conserved signalling networks, notably the Hippo and Wnt pathways, and modulated by autocrine and paracrine factors such as colony-stimulating factor 2, fibroblast growth factor 2, leukocyte inhibitory factor and insulin-like growth factor 1. Concurrently, epigenetic reprogramming, including dynamic changes in DNA methylation and histone modifications, fine-tunes gene expression to ensure appropriate lineage allocation and developmental competence. In vitro culture conditions and cryopreservation protocols have a profound impact on embryo quality, survival and post-transfer pregnancy outcomes. Understanding the interplay between signalling cascades, transcriptional programmes and environmental inputs is crucial for optimising assisted reproductive technologies, improving livestock productivity and informing comparative studies of mammalian development.
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Embryonic Development Dynamics in Bovine Systems publication trend
The graph below shows the total number of articles in embryonic development dynamics in bovine systems across all publications each year (not limited to Nature Index journals).
Technical terms
Blastocyst: A fluid-filled structure formed around day 7 post-fertilisation, comprising an outer trophectoderm layer and an inner cell mass.
Trophectoderm: The epithelial cell layer of the blastocyst that gives rise to the placenta and extra-embryonic membranes.
Inner cell mass (ICM): A cluster of undifferentiated cells within the blastocyst that will form the embryo proper.
Cryopreservation: The process of freezing embryos for long-term storage and later transfer.
Single-cell RNA sequencing (scRNA-seq): A method to profile gene expression in individual cells, revealing cellular heterogeneity and developmental trajectories.
Epigenetic reprogramming: The erasure and re-establishment of DNA methylation and histone modification patterns during early development.
Hippo signalling pathway: A regulatory cascade that controls cell fate by modulating the localisation and activity of transcriptional co-activators.
Wnt signalling pathway: A conserved network of ligands and receptors that regulates cell proliferation, differentiation and axis formation during embryogenesis.
References
- Effects of Regulating Hippo and Wnt on the Development and Fate Differentiation of Bovine Embryo. International Journal of Molecular Sciences (2024).
- Dynamics of DNA Methylation during Early Development of the Preimplantation Bovine Embryo. PLOS ONE (2013).
- Improved cryopreservation of in vitro produced bovine embryos using FGF2, LIF, and IGF1. PLOS ONE (2021).
- The global gene expression outline of the bovine blastocyst: reflector of environmental conditions and predictor of developmental capacity. BMC Genomics (2021).
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