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Aging Selectively Impairs Crucial DNA- and RNA-Binding Proteins in Killifish Brains,Study Reveals
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New research published in Science sheds light on how aging affects protein production in the brain,potentially offering new avenues for combating age-related neurodegenerative diseases.
London, UK - A groundbreaking study has identified a selective decline in the production of vital DNA- and RNA-binding proteins in the aging brains of killifish. This impairment, researchers suggest, contributes to key hallmarks of aging and could be a critically important factor in the development of neurodegenerative conditions. The findings, detailed in the journal Science, open up exciting possibilities for therapeutic interventions aimed at extending healthy lifespan.
Understanding Proteostasis and Aging
As organisms age, their ability to maintain protein homeostasis, or proteostasis, deteriorates.Proteostasis is the intricate cellular process responsible for ensuring proteins are synthesized correctly,fold into their proper three-dimensional structures,and are efficiently degraded when damaged or no longer needed. A breakdown in proteostasis can lead to the accumulation of misfolded or aggregated proteins, a characteristic feature of both aging and numerous neurodegenerative diseases, such as alzheimer’s and Parkinson’s. While this decline in proteostasis often accompanies other age-related changes, the extent to which it actively drives these processes has remained a subject of investigation.
killifish: A Model for Aging Research
To unravel the complex relationship between aging and protein regulation in the brain, a team led by Domenico Di Fraia investigated the killifish (Nothobranchius furzeri). This species is an ideal model organism for aging studies due to its remarkably short lifespan and the presence of conserved aging hallmarks in its brain, mirroring those observed in mammals.
The researchers employed a novel method involving the partial inhibition of the proteasome over time. The proteasome is a cellular machine responsible for protein degradation. By manipulating its function,the scientists aimed to determine if this specific impairment could trigger age-related brain changes in living animals.
Ribosome Profiling Reveals Translation Impairment
A key technique utilized in the study was ribosome profiling (Ribo-seq). this advanced method allows scientists to precisely measure which messenger RNA (mRNA) molecules are being actively translated into proteins and at what rate.Using Ribo-seq, Di Fraia and colleagues observed a significant decline in the production of proteins rich in basic amino acids – such as lysine, proline, glutamine, and arginine - as the killifish aged. These specific amino acids are critical for proteins that bind to DNA and RNA, playing essential roles in gene expression and cellular function.
Intriguingly, the study found that the mRNA levels for these essential proteins remained largely unchanged. This indicated that the problem lay not in the availability of the genetic instructions, but in the cellular machinery responsible for translating those instructions into functional proteins.
The Mechanism Behind Protein Decline
The research team linked this selective protein decline to a phenomenon known as ribosomal stalling. They discovered that ribosomes, the cellular factories that build proteins, encountered difficulties when translating sequences rich in basic amino acid codons.This stalling impaired the efficiency of protein synthesis, increased the risk of protein aggregation, and ultimately reduced the production of these crucial DNA- and RNA-binding proteins.
These findings suggest that aging may selectively hinder the synthesis of proteins vital for core gene expression and mitochondrial function. this impairment in protein production could position the decline in proteostasis as an upstream driver of other aging hallmarks, offering a new perspective on the aging process.
Future Directions and Therapeutic Potential
“A critical next step will be to determine whether these mechanisms are conserved in mammals, especially in humans, where translational control is intricately linked to neurodegeneration and other age-associated diseases,” commented Olivier Dionne and Benoit Laurent in a related Perspective.
The implications of this research are far-reaching. Understanding how aging impacts protein synthesis could pave the way for novel therapeutic strategies. “This could inform the development of pharmacological strategies to modify proteostasis with the aim of delaying the onset of age-related pathologies and ultimately extending healthy years of life,” they added. By targeting the mechanisms that impair protein production, scientists may be able to develop interventions that promote healthier aging and combat the debilitating effects of neurodegenerative diseases.
Source: American Association for the Advancement of Science (AAAS)
Journal Reference: Di Fraia, D., et al. (2025). Altered translation elongation contributes to key hallmarks of aging in the killifish brain. Science*. doi.org/10.1126/science.adk3079