What is the basic difference between a tumor suppressor gene and a proto-oncogene?

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Tumor-suppressor genes versus Proto-oncogenes.This is a library-research topic in which you are required to provide your sources. Mutations in tumor suppressor genes can contribute to or cause cancer, just as mutations in proto-oncogenes can also contribute to or cause cancer. However, tumor suppressor genes are very different from proto-oncogenes.

· (a) What is the basic difference between a tumor suppressor gene and a proto-oncogene?

· (b) Explain why a gain-of-function mutation to a proto-oncogene (or its promoter) may be associated with increased risk of cancer.

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· (c) Explain why a loss-of-function mutation to a tumor suppressor gene may be associated with increased risk of cancer.

 

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