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Relevance
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LIN-9 regulates cell transformation and proliferation in mammalian cells by inhibiting DNA synthesis. LIN-9 is inhibited by the regulatory subunit of CDK4, cyclin D. Deletion of the first 84 amino acids of Mip/LIN-9 (Mip/LIN-9∆84) corrects the CDK4 null phenotype. Therefore, Mip/LIN-9, like the pocket proteins pRB, p107 and p130, is negatively regulated by CDK4. Moreover, the correction of the CDK4 null phenotype is accompanied by a restoration of the expression of genes such as E2F1, E2F3, and cyclin E suggesting that Mip/LIN-9 participates in the regulation of E2F target genes required for the G1/S transition.
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