Tissue organization alters gene expression in equine induced trophectoderm cells.

This research focuses on the effects of tissue organization on gene expression in horse-induced trophectoderm cells. It suggests that the shape or conformation of the tissue might play a role in affecting the gene expression and provides clues to receptors and signaling pathways involved in early blastocyst development.

Methodology

• The researchers used equine induced trophectoderm (iTr) cells for this experiment. These cells are cultured as monolayers or in suspension to form spheres. The hollow spheres resemble the structure of native equine blastocysts.
• They extracted total RNA from both the iTr monolayers and spheres, which was then analyzed using RNA sequencing. Around 32.2 million and 31 million aligned reads were analyzed for spheres and monolayers respectively.

Findings and Analysis

• They identified that 44 genes were unique to monolayers and 45 genes were uniquely expressed in the spheres, thus highlighting differences in gene expression depending on the conformation.
• However, seven core genes exhibited no difference in their expression regardless of conformation. These genes, CDX2, POU5F1, TEAD4, ETS2, ELF3, GATA2, and TFAP2A, form the core gene network of native trophectoderm.
• The researchers then used bioinformatics to categorize the differentially expressed genes, connecting them to changes in tissue shape. They also found that the majority of these genes were associated with binding activity involved in cellular, developmental, and metabolic processes.
• The study identified several receptor-ligand families associated with protein interaction in iTr cells. The enrichment of genes coding for PI3-kinase and MAPK signaling intermediates pointed out these as the signaling pathways associated with the structural changes of early trophectoderm.

Conclusion

• The study provided evidence that ligand-initiated kinase signaling pathways play an essential role in the structural changes of early trophectoderm. This suggests an important relation between tissue shape and gene expression during the early development of a mammalian blastocyst.