Abnormal neurodevelopment predisposes to cortical hyperexcitability in Huntington's disease

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Huntington's disease (HD) is characterized by progressive neurodegeneration.
• Emerging evidence implicates abnormal brain development in HD pathogenesis.
• Mutant huntingtin protein disrupts critical developmental processes.

Purpose of the Study:

• To review morphological and electrophysiological evidence of abnormal neurodevelopment in HD.
• To examine findings from human HD mutation carriers and genetic animal models.
• To explore the implications of developmental abnormalities for early HD treatment strategies.

Main Methods:

• Review of existing human imaging and morphological studies in HD mutation carriers.
• In-depth examination of recent findings from genetic animal models of HD.
• Analysis of electrophysiological and morphological data related to neuronal development.

Main Results:

• Mutant huntingtin affects corticogenesis, cell migration, and differentiation, resembling focal cortical dysplasia.
• Neuronal morphology and electrophysiological properties deviate from normal development in animal models.
• Delayed cortical pyramidal neuron development and transiently accelerated striatal neuron maturation observed.

Conclusions:

• Abnormal neurodevelopment is a fundamental aspect of Huntington's disease progression.
• The brain exhibits compensatory mechanisms during a latent period before symptom onset.
• Understanding HD's developmental origins offers novel therapeutic targets for early intervention.