Huntington's Disease Concepts and Mechanisms

The video by Kevin Tockoff at Catalyst University covers Huntington's disease, focusing on its pathophysiology, genetic basis, and the role of the huntingtin protein. It explains how protein misfolding leads to neuron death, particularly in the basal nuclei, causing symptoms like chorea. The video also reviews the direct and indirect pathways of movement and how Huntington's disease affects them, leading to increased involuntary movements.

What is the primary cause of Huntington's Disease?

• A viral infection

• Environmental factors

• Abnormalities in the huntingtin protein

• Lack of exercise

How many CAG repeats are considered normal in the huntingtin protein?

• More than 40

• 10 to 26

• 27 to 35

• Less than 10

What happens when there are more than 60 CAG repeats in the huntingtin protein?

• The disease is cured

• The protein functions normally

• It leads to juvenile Huntington's Disease

• The disease does not manifest

What is the consequence of huntingtin protein misfolding?

• Enhanced cognitive abilities

• Neuronal death due to aggregation

• Increased protein stability

• Improved neuronal function

Which type of neurons are primarily affected in Huntington's Disease?

• Pyramidal neurons

• Medium spiny neurons

• Oligodendrocytes

• Purkinje cells

What are the initial symptoms of Huntington's Disease?

• Severe motor dysfunction

• Cognitive and psychological issues

• Complete paralysis

• Sudden weight gain

What is chorea in the context of Huntington's Disease?

• A type of cognitive decline

• Involuntary jerking movements

• A psychological disorder

• A form of speech impairment

Which pathway is responsible for promoting movement in the basal nuclei?

• Indirect pathway

• Direct pathway

• Cerebellar pathway

• Limbic pathway

How does Huntington's Disease affect the indirect pathway in the basal nuclei?

• It leaves the pathway unaffected

• It enhances the pathway's function

• It causes excessive inhibition of movement

• It reduces inhibition, leading to excessive movement

What is the role of the globus pallidus internus in the indirect pathway?

• To promote muscle contraction

• To inhibit the thalamus

• To enhance cognitive function

• To activate the thalamus