Your DNA has a secret “second code” that decides which genes get silenced

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April 9, 2026, 8:32 AM

• •Human cells regulate gene expression based on codon choice.
• •DHX29, an RNA-binding protein, plays a key role in this process.
• •DHX29 interacts with ribosomes and recruits the GIGYF2•4EHP complex.
• •The complex suppresses mRNAs with non-optimal codons, enhancing efficiency.
• •This discovery has implications for cell differentiation, maintaining cellular balance, and the development of cancer.

Scientists from Kyoto University and RIKEN have identified a mechanism by which human cells regulate gene expression based on codon choice, challenging the long-held view of synonymous codons as simply redundant. They discovered that the RNA-binding protein DHX29, along with the GIGYF2•4EHP complex, detects and suppresses mRNAs containing non-optimal codons, leading to more efficient protein production. This process highlights a direct molecular link between codon choice and gene expression, which could impact critical biological functions like cell differentiation and cancer development. The researchers plan to further investigate how DHX29 influences gene activity in both health and disease.

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