Cerebellar hypoplasia caused by calcium/calmodulin-dependent serine protein kinase deficiency

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• Calcium/calmodulin-dependent serine protein kinase (CASK) is an X-linked scaffolding protein interacting with Neurexins.
• Loss-of-function mutations in CASK cause microcephaly with pontine and cerebellar hypoplasia (MICPCH), a severe neurodevelopmental disorder.
• The precise mechanisms of CASK's role in cerebellar hypoplasia remain unclear.

Purpose of the Study:

• To review the role of CASK in cerebellar neuron survival.
• To integrate findings on Neurexin-CASK interactions and CASK's function in cerebellar development.
• To discuss potential therapeutic strategies for CASK-related disorders.

Main Methods:

• Review of recent studies utilizing genetically engineered mouse models.
• Analysis of cerebellar granule cell cultures.
• Integration of data on synaptic cell-adhesion biology and CASK function.

Main Results:

• CASK is essential for cerebellar neuron survival, not initial patterning.
• X-chromosome inactivation mosaicism impacts MICPCH pathology.
• CASK deficiency activates c-Jun N-terminal kinase (JNK) signaling.

Conclusions:

• CASK plays a vital role in cerebellar neuron survival.
• Understanding Neurexin-CASK interactions and JNK signaling is key to CASK-related disorders.
• Emerging therapeutic implications exist for treating MICPCH and related conditions.