A normal gene that regulates cell growth and division, which can become an oncogene when mutated or overexpressed. These genes play essential roles in healthy cellular processes but become problematic when their function is disrupted.
From Greek 'protos' meaning first or original, combined with 'oncogene.' The term emerged in the 1970s when scientists realized that oncogenes were corrupted versions of normal cellular genes, not foreign genetic elements as originally thought.
Proto-oncogenes are the Jekyll to oncogenes' Hyde - they're actually good guys doing important jobs like telling cells when to grow and divide! It's only when they get damaged or start working overtime that they become the villains of cancer.
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