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Published on: March 3, 2023
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Laminin N-terminus α31 expression during development is lethal and causes widespread tissue-specific defects in a
Conor J Sugden1, Valentina Iorio1, Lee D Troughton2
1Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, UK.
Summary
The protein Laminin N terminus α31 (LaNt α31), produced by alternative splicing, causes embryonic lethality and widespread bleeding in mice. This study provides the first in vivo evidence of LaNt α31
Area of Science:
- Cell biology
- Developmental biology
- Biochemistry
Background:
- Laminins (LMs) are crucial basement membrane proteins regulating tissue functions.
- Alternative splicing of the laminin α3 gene yields Laminin N terminus α31 (LaNt α31), a netrin-like protein.
- LaNt α31 is found in healthy tissues and elevated during cancer and wound healing, with in vitro studies suggesting roles in cell behavior and matrix organization.
Purpose of the Study:
- To investigate the in vivo function of Laminin N terminus α31 (LaNt α31).
- To establish a mouse model for inducible LaNt α31 expression to study its physiological effects.
Main Methods:
- Generation of a mouse transgenic line with inducible LaNt α31 expression driven by the ubiquitin C promoter.
- Induction of LaNt α31 expression at embryonic day 15.5.
- Histological analysis of affected tissues in transgenic animals.
Main Results:
- Transgenic animals with induced LaNt α31 expression were not viable at birth.
- Widespread extravascular bleeding was observed across multiple tissues.
- Significant defects included kidney epithelial detachment, epidermal and hair follicle disruption, liver cell reduction, and depleted hematopoietic foci.
Conclusions:
- This study provides the first in vivo evidence that LaNt α31 significantly impacts tissue morphogenesis.
- Overexpression of LaNt α31 leads to embryonic lethality and severe developmental defects, including hemorrhage and organ damage.
- These findings suggest a critical role for LaNt α31 in maintaining tissue integrity and development.
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