Dr Duncan Schellenberg Patched
Based on the keyword string provided, this appears to be a request for a guide related to Dr. Duncan B. Schellenberg, a prominent figure in the fields of Patched (Patched1/PTCH1) signaling and Hedgehog pathway research.
Dr. Schellenberg (associated with the University of Washington’s Department of Biological Structure) has published seminal work on how the Patched receptor functions. Specifically, his research helped resolve the long-standing debate on whether Patched acts via a "sterile" transport mechanism or protein-protein interactions.
Here is a guide based on the scientific understanding of Dr. Schellenberg’s work on the Patched receptor. dr duncan schellenberg patched
1. The Core Concept: The "Sterile" Hypothesis
Before the research conducted by Schellenberg and colleagues, the mechanism of how Patched inhibited the protein Smoothened (SMO) was a mystery. Dr. Schellenberg's work provided crucial evidence for the Sterol Sensing Model.
- The Old View: It was hypothesized that Patched might be pumping unknown molecules or interacting physically with Smoothened to stop signaling.
- The Schellenberg Contribution: His work demonstrated that Patched acts as a transporter. Specifically, it functions as a "pump" that exports specific sterols out of the cell membrane.
Practical Application
Clinicians applying Schellenberg’s principles will find themselves doing more "oral motor" or tactile-kinetic work than they might with standard phonological clients. This involves: Based on the keyword string provided, this appears
- Increasing awareness of tongue tip vs. back of tongue.
- Using metaphorical phonetics (e.g., "Mr. Tongue Tip" vs. "The Back Lift").
- Utilizing visual feedback (tongue depressors, mirrors) to break the "patched" habit.
Step C: The "On" State (Smoothened Activates)
Accumulated sterols bind to a specific pocket on Smoothened (SMO). This changes SMO's shape, activating the signaling cascade that leads to gene transcription.
Useful Critical Takeaways
If you’re studying or debating this topic, here’s what to keep in mind: The Old View: It was hypothesized that Patched
| Aspect | Summary |
|--------|---------|
| Strength of the original argument | Schellenberg’s hiddenness argument is one of the most influential recent atheological arguments; it shifts focus from evil to non-belief. |
| Common patches | Defenders adjust concepts of “resistance” and “relationship with God” to block objections (e.g., free will, soul-making, or cognitive limitations). |
| Main objections patches try to fix | – Some non-belief might be due to non-culpable ignorance.
– God might have reasons to remain hidden even from sincere seekers (e.g., to preserve moral autonomy).
– The argument assumes a specific model of loving relationships. |
| Unpatched vulnerabilities | Even patched versions struggle with:
– Empirical ambiguity of who is “non-resistant.”
– Theological alternatives (e.g., open theism, universalism).
– The possibility of goods that necessarily involve hiddenness (e.g., risk, faith, character development). |
| Overall assessment | Schellenberg’s argument is philosophically serious and forces theists to refine their views, but “patched” versions are debated; no consensus exists that any patch successfully restores the argument’s original force. |
The Clinical Problem
Dr. Schellenberg’s work focuses on the differential diagnosis of articulation errors that look identical on the surface but have different underlying causes. This is particularly relevant for what some might call "patched" or "backed" substitutions.
Traditionally, clinicians might treat a child who says "key" for "tea" using minimal pairs. However, Schellenberg’s research highlights a critical distinction: some children have a phonological constraint (a rule-based issue), while others have a phonetic motor constraint (a physical inability to differentiate the place of articulation).