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Conditional deletions refine the embryonic requirement for Dlk1
Oliver K Appelbe1, Aleksey Yevtodiyenko, Hilmarie Muniz-Talavera
1Department of Biological Sciences, University of Illinois at Chicago, 900 S. Ashland Avenue, Chicago, IL 60607, USA. oappel2@uic.edu
Mechanisms of Development
|October 13, 2012
Summary
Delta-like 1 (DLK1) is crucial for embryonic development. Conditional knockout mice showed DLK1 is not essential for pancreatic beta-cells, pituitary somatotrophs, or endothelial cells, suggesting other tissues are responsible for its null phenotype.
Area of Science:
- Developmental Biology
- Genetics
- Endocrinology
Background:
- Delta-like 1 (DLK1) is a transmembrane protein homologous to Notch ligands, implicated in embryonic growth and differentiation.
- DLK1 expression is dynamic, widespread in early development and restricted to specific adult tissues like pancreatic beta-cells and pituitary somatotrophs.
Purpose of the Study:
- To generate a conditional Dlk1 mouse line (Dlk1(flox)) for cell type-specific gene deletion.
- To investigate the role of DLK1 in pancreatic beta-cells, pituitary somatotrophs, and embryonic/placental endothelial cells.
Main Methods:
- Generation of Dlk1(flox) conditional knockout mice.
- Utilized four tissue-specific Cre mouse lines for targeted Dlk1 deletion in key candidate cell types.
Main Results:
- Conditional Dlk1 deletion in pancreatic beta-cells, pituitary somatotrophs, and endothelial cells did not result in lethality or developmental defects.
- These findings indicate DLK1 is not essential for the normal development of these specific cell types.
Conclusions:
- The tissues responsible for the previously observed Dlk1 null phenotype remain unidentified.
- The Dlk1(flox) mouse line is a valuable tool for future research into DLK1 function.
