Oncogene is a gene which in certain circumstances can transform a cell into a tumour cell.
Everything we have has reason and meaning. Or there was some use in past.
What's the reason for we have oncogenes?
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A proto -oncogene is a normal gene that could become an oncogene due to mutations or increased expression. The resultant protein encoded by an oncogene is termed oncoprotein. Proto - oncogenes code for proteins that help to regulate cell growth and differentiation.
So, we actually do not have oncogenes. Instead we have proto-oncogenes. Due to mutation or virus, these are converted into oncogenes.
Since, proto-oncogenes are required for normal cell division and differentiation, they are necessary. Also, these can change to oncogenes any time. So, we always have to live with probability of this conversion.