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Neural tube defects by NUAK1 and NUAK2 double mutation
Tomomi Ohmura1, Go Shioi, Mariko Hirano
1Laboratory for Vertebrate Body Plan, Center for Developmental Biology, RIKEN Kobe, Kobe, Japan.
NUAK1 and NUAK2 kinases are essential for neural tube development. Their absence causes severe birth defects by disrupting cell shape changes required for proper brain and spinal cord formation.
Area of Science:
- Developmental Biology
- Cell Biology
- Molecular Biology
Background:
- NUAK1 and NUAK2, serine/threonine kinases, are highly expressed in neuroectoderm.
- Their roles in neurulation, the process of neural tube formation, remain largely unknown.
Purpose of the Study:
- To investigate the function of NUAK1 and NUAK2 during embryonic neural tube development.
Main Methods:
- Analysis of NUAK1 and NUAK2 double mutant mice.
- Microscopic examination of neural plate morphology and cellular components.
Main Results:
- NUAK1/NUAK2 double mutants display exencephaly, facial clefting, and spina bifida.
- Defects in cranial neural plate hinge formation, apical constriction, and apico-basal elongation were observed.
- Reduced apical concentration of phosphorylated myosin light chain 2, F-actin, and cortactin, with poor microtubule development.
Conclusions:
- NUAK1 and NUAK2 play complementary roles in apical constriction and cell elongation during neural plate development.
- These processes are crucial for dorsolateral hinge point formation in the cephalic neural plate.
- Disruption of these functions leads to severe neural tube closure defects.
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