Hedgehog Signaling Pathway Concepts

The video explains the Hedgehog signaling pathway in Drosophila, highlighting its role in development. It covers the Hedgehog protein's function, the impact of mutations, and the pathway's components, including the Patched receptor and Smoothened protein. The video details the pathway's behavior in the absence and presence of the Hedgehog signal, leading to either repression or activation of target genes. The conclusion encourages viewer engagement.

What is the primary role of the Hedgehog signaling pathway in Drosophila?

• To regulate the immune response

• To manage energy metabolism

• To facilitate cell apoptosis

• To control the body plan during development

Why is the Hedgehog protein named as such?

• It resembles a hedgehog in structure

• It causes Drosophila to develop spines like a hedgehog when mutated

• It was discovered by a scientist named Hedgehog

• It is found in hedgehogs

Which protein acts as the receptor for the Hedgehog protein in the pathway?

• Smoothened protein

• Patched receptor

• CI protein

• Sufu protein

What happens to the Smoothened protein in the absence of the Hedgehog signal?

• It phosphorylates other proteins

• It binds to DNA

• It is activated

• It is inhibited and degraded

What is the role of the CI 75 protein in the absence of the Hedgehog signal?

• Acts as a transcriptional activator

• Initiates cell division

• Facilitates protein synthesis

• Acts as a transcriptional repressor

In the presence of the Hedgehog signal, what happens to the Patched receptor?

• It activates the CI protein

• It binds to DNA

• It is phosphorylated

• It is degraded

What is the function of the CI 155 protein when the Hedgehog signal is present?

• Acts as a transcriptional repressor

• Inhibits the Patched receptor

• Degrades the Smoothened protein

• Acts as a transcriptional activator

Which kinases are involved in phosphorylating the Smoothened protein?

• PKA and GSK3

• CK1 and GSK3

• GSK3 and PKA

• PKA and CK1

What is the outcome of the Hedgehog signaling pathway when the signal is present?

• Inhibition of gene expression

• Activation of Hedgehog signaling genes

• Degradation of all pathway proteins

• No change in gene expression

What is the final step in the Hedgehog signaling pathway when the signal is present?

• CI 155 protein acts as a transcriptional activator

• Patched receptor is activated

• Smoothened protein is degraded

• CI 155 protein acts as a transcriptional repressor