MUTANT SMOOTHENED AND METHODS OF USING THE SAME
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Abstract
The emergence of mutations in tyrosine kinases following treatment of cancer patients with molecular-targeted therapy represents a major mechanism of acquired drug resistance. Here, we describe a mutation in the serpentine receptor, Smoothened (SMO), which results in resistance to a Hedgehog (Hh) pathway inhibitor in medulloblastoma. A single amino acid substitution in a conserved aspartic acid residue of SMO maintains Hh signaling, but results in the inability of the Hh pathway inhibitor, GDC-0449, to bind SMO and suppress the pathway. The invention provides screening methods to detect SMO mutations and methods to screen for drugs that specifically modulate mutant SMO exhibiting drug resistance.
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37 Claims
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1-8. -8. (canceled)
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9. A recombinant mutant SMO protein comprising the amino acid sequence of SEQ ID NO:
- 2, wherein said amino acid sequence comprises alanine (A) or lysine (K) at amino acid 518.
- View Dependent Claims (10, 31, 32, 33, 34, 35, 36, 37)
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11-30. -30. (canceled)
Specification