key term - Snail

Definition

In developmental biology, 'snail' refers to a family of transcription factors that play a critical role in the process of neural induction and neurulation. These proteins are essential for the development of the nervous system, particularly in regulating cell fate decisions during early embryonic development and promoting epithelial-mesenchymal transition (EMT), which is vital for proper neural tube formation.

5 Must Know Facts For Your Next Test

1. Snail proteins are transcription factors that bind to DNA and regulate gene expression crucial for neural differentiation and development.
2. They are particularly involved in the epithelial-mesenchymal transition, which is important for allowing cells to migrate during neural tube formation.
3. The expression of snail is tightly regulated during embryonic development; abnormal expression can lead to neural tube defects.
4. Snail proteins can also influence the development of other tissues and play roles in processes like wound healing and cancer metastasis.
5. Research has shown that manipulating snail expression can affect the fate of progenitor cells, potentially leading to advances in regenerative medicine.

Review Questions

• How do snail proteins influence neural induction during early embryonic development?
  • Snail proteins are essential for neural induction as they regulate gene expression that dictates cell fate decisions. By promoting epithelial-mesenchymal transition, they enable certain cells to lose their epithelial characteristics and become migratory mesenchymal cells. This transition is critical for proper neural tube formation, ultimately influencing the overall development of the nervous system.
• Discuss the role of snail proteins in epithelial-mesenchymal transition and its importance for neurulation.
  • Snail proteins play a pivotal role in facilitating epithelial-mesenchymal transition (EMT), where epithelial cells transform into mesenchymal stem cells capable of migration. This process is crucial during neurulation because it allows for the movement of cells that will form the neural tube. Without effective EMT driven by snail proteins, proper closure of the neural tube may not occur, leading to developmental abnormalities such as spina bifida.
• Evaluate how dysregulation of snail expression could impact embryonic development and contribute to conditions like neural tube defects.
  • Dysregulation of snail expression can significantly impact embryonic development by disrupting key processes such as cell differentiation and migration. If snail is overexpressed or underexpressed, it can lead to improper epithelial-mesenchymal transition, resulting in failures in neural tube formation. This can manifest as neural tube defects, highlighting the importance of precise regulation of snail during early development and its potential implications for congenital disorders.

Related terms

Neural Induction:

The process by which certain cells in the embryo are directed to become neural tissue, leading to the formation of the nervous system.

Epithelial-Mesenchymal Transition (EMT): A biological process where epithelial cells lose their characteristics and gain migratory and invasive properties, allowing them to become mesenchymal stem cells.

Neurulation: The developmental process in which the neural plate forms the neural tube, giving rise to the central nervous system.