Lipid Metabolism in Bovine Embryo Development

Lipid metabolism underpins the earliest stages of bovine embryogenesis by supplying energy, scaffolding membrane biogenesis and modulating signalling pathways. During oocyte maturation and preimplantation development, lipids stored as cytoplasmic droplets are hydrolysed via β-oxidation to yield adenosine triphosphate before the embryonic genome is activated. Excessive accumulation of triglycerides and glycerophospholipids in in vitro-derived embryos is linked to altered mitochondrial function, oxidative stress and reduced tolerance to cryopreservation. Conversely, controlled lipolysis regulated by peroxisome proliferator-activated receptors and uncoupling proteins ensures redox balance and optimal developmental competence. Key transport proteins, including fatty acid-binding protein 3, mediate fatty acid uptake and trafficking between cumulus cells and oocyte via transzonal projections. Culture conditions, such as serum supplementation and physical stressors, shape the lipidome and influence embryo quality. Advances in mass spectrometry and lipidomics have delineated species-specific demands for lipid utilisation, highlighting divergent patterns between bovine and other mammalian embryos. A refined understanding of lipid homeostasis offers routes to enhance cryotolerance, improve in vitro fertilisation outcomes and inform livestock breeding practices globally.

Research from Nature Portfolio

Recent studies have elucidated molecular mechanisms driving lipid accumulation and remodelling in early bovine embryos. One investigation identified fatty acid-binding protein 3 as a critical mediator of triglyceride transport from cumulus cells to the oocyte during in vitro maturation; disruption of transzonal projections attenuated lipid loading and revealed the role of FABP3 in cytoplasmic lipid deposition. Another analysis compared the lipid profiles of grade-1 blastocysts produced in vivo and in vitro before and after slow freezing; in vitro-produced embryos exhibited enrichment in oxidised glycerophospholipids and triglycerides, while cryopreservation altered lysophosphatidylcholine content. These insights link specific lipid classes to developmental competence and cryotolerance, underscoring targets for optimising assisted reproduction protocols.

Lipid Metabolism in Bovine Embryo Development publication trend

The graph below shows the total number of articles in lipid metabolism in bovine embryo development across all publications each year (not limited to Nature Index journals).

Technical terms

Lipid droplet: Intracellular organelle composed of a neutral lipid core surrounded by a phospholipid monolayer, serving as an energy reserve and signalling hub.

Peroxisome proliferator-activated receptor gamma (PPARγ): Nuclear receptor that regulates genes involved in lipid uptake, storage and mitochondrial function.

Uncoupling protein 1 (UCP1): Mitochondrial inner membrane protein that dissipates proton gradients, promoting heat generation and lipid oxidation.

Fatty acid-binding protein 3 (FABP3): Cytoplasmic chaperone that transports long-chain fatty acids and facilitates their uptake and intracellular trafficking.

Transzonal projections (TZPs): Filamentous extensions of cumulus cells that connect to the oocyte, enabling intercellular exchange of metabolites and signalling molecules.

β-Oxidation: Mitochondrial pathway in which fatty acids are broken down into acetyl-CoA units to generate ATP.

Cryotolerance: The capacity of cells or embryos to withstand freezing and thawing without sustaining lethal damage.

References

1. Procyanidin B2 improves developmental capacity of bovine oocytes via promoting PPARγ/UCP1‐mediated uncoupling lipid catabolism during in vitro maturation. Cell Proliferation (2024).
2. Beyond energy provider: multifunction of lipid droplets in embryonic development. Biological Research (2023).
3. Species and embryo genome origin affect lipid droplets in preimplantation embryos. Frontiers in Cell and Developmental Biology (2023).
4. Fatty Acid Binding Protein 3 And Transzonal Projections Are Involved In Lipid Accumulation During In Vitro Maturation Of Bovine Oocytes. Scientific Reports (2017).
5. Lipid profile of bovine grade-1 blastocysts produced either in vivo or in vitro before and after slow freezing process. Scientific Reports (2021).