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Neuronal differentiation and patterning in Xenopus: the role of cdk5 and a novel activator xp35.2
A Philpott1, L Tsai, M W Kirschner
1Deparment of Cell Biology, Department of Pathology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts, 02115, USA. ap113@hermes.cam.ac.uk
Abstract:
Cdk5, a member of the cyclin-dependent kinase family, has been shown to play an important role in development of the central nervous system in mammals when partnered by its activator p35. Here we describe the cloning and characterization of a novel activator of cdk5 in Xenopus, Xp35.2. Xp35.2 is expressed during development initially in the earliest differentiating primary neurons in the neural plate and then later in differentiating neural tissue of the brain. This is in contrast to the previously described Xenopus cdk5 activator Xp35.1 which is expressed over the entire expanse of the neural plate in both proliferating and differentiating cells. Expression of both Xp35.1 and Xp35.2 and activation of cdk5 kinase occur when terminal neural differentiation is induced by neurogenin and neuro D overexpression but not when only early stages of neural differentiation are induced by noggin. Moreover, blocking cdk5 kinase activity specifically results in disruption and reduction of the embryonic eye where cdk5 and its Xp35 activators are expressed. Thus, cdk5/p35 complexes function in aspects of neural differentiation and patterning in the early embryo and particularly in formation of the eye.
Insights
A novel cyclin-dependent kinase 5 (cdk5) activator, Xp35.2, was identified in Xenopus. This discovery reveals cdk5/p35 complexes are crucial for neural differentiation and embryonic eye development.
Area of Science:
- Developmental biology
- Neuroscience
- Molecular biology
Background:
- Cyclin-dependent kinase 5 (cdk5) is vital for mammalian central nervous system development, partnered with its activator p35.
- Understanding cdk5 regulation in early development is crucial for comprehending neural patterning.
Purpose of the Study:
- To clone and characterize a novel cdk5 activator in Xenopus, named Xp35.2.
- To investigate the role of Xp35.2 and cdk5 in early neural differentiation and embryonic development.
Main Methods:
- Cloning and characterization of the Xp35.2 gene in Xenopus.
- Expression analysis of Xp35.1 and Xp35.2 during neural differentiation.
- Overexpression studies using neurogenin, neuro D, and noggin.
- Inhibition of cdk5 kinase activity.
Main Results:
- Xp35.2 is expressed in differentiating primary neurons and later in brain neural tissue.
- Xp35.1 and Xp35.2 expression and cdk5 activation correlate with terminal neural differentiation.
- Blocking cdk5 activity leads to reduced embryonic eye formation.
Conclusions:
- cdk5/p35 complexes play a role in neural differentiation and patterning in early Xenopus embryos.
- Specific cdk5 activators, like Xp35.2, are important for embryonic eye development.