Researchers have announced a significant advancement in dementia research with the release of the first complete genome of the common marmoset, a small primate native to South America. This breakthrough, achieved by a team at the University of California, Santa Cruz Genomics Institute, promises to deepen understanding of dementia, Alzheimer’s disease, and other complex conditions by providing an unprecedented level of genetic detail.
Marmosets have become an increasingly important model in scientific studies due to their closer evolutionary relationship to humans compared to traditional animal models like mice. Their relatively small size also makes them more manageable than larger primates such as macaques. Notably, new-world primates like marmosets experience memory deterioration related to ageing, similar to humans, which makes them invaluable for dementia research.
Until now, researchers lacked a fully complete and accurate genetic reference for the species. The first marmoset reference genome, produced in 2014, contained numerous gaps and inaccuracies, limiting the precision of genetic analysis. By employing advanced genome assembly algorithms developed by the Telomere-to-Telomere (T2T) Consortium-a multi-institutional collaboration responsible for producing the first complete human genome in 2022-the new reference genome eliminates previous errors and reveals several complex genetic features.
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The team, led by doctoral student Prajna Hebbar and Professor Benedict Paten, analysed genetic variations across 230 marmosets using the updated genome. They identified variations in multiple genes linked to Alzheimer’s disease and the immune system in humans, reinforcing the marmoset’s value as a model for neurodegenerative diseases. Specifically, they found 76 genes related to Alzheimer’s, Parkinson’s, and other neurodegenerative conditions, with counterparts in marmosets.
Ms Hebbar emphasised the benefits: “We now have a high-quality, complete resource that allows researchers to study Alzheimer’s-related genes in marmosets with far greater accuracy. This supports the potential for medical discoveries relevant to human health.”
The new genome also uncovered unexpected findings, such as the marmoset’s ability to reorganise ribosomal DNA-a vital component for protein synthesis-between chromosomes more dynamically than previously observed in primates. They noted sex-specific differences in the distribution of these genes, a pattern also reported in orangutans and gibbons, which expands understanding of gene functions crucial for cellular biosynthesis.
Further observations include unique patterns in the centromeres-key regions for chromosome division-highlighting areas for future investigation.
Doctoral student Prajna Hebbar reflected on the research progress: “This is an extraordinary time to be studying genomics. For decades, complex and repetitive regions of the genome were inaccessible. Now, with routine T2T sequencing, we can explore these areas and uncover vital biological insights.”
This pioneering work not only advances dementia and Alzheimer’s research but also exemplifies how expanding genome sequencing technologies can shape personalised medicine and genomic studies across species.