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DNA molecules are essential carriers of genetic information, including partner molecules. RNA encodes the building blocks of life, specifically amino acids. Together, DNA, RNA, and amino acids form larger structures known as genes, which make up the genetic code for proteins that perform vital functions or contribute to other significant biomolecules.
Occasionally, the RNA within a gene may contain defects that can severely impact protein functionality. Such misfolded proteins, which can lead to fatal diseases, are known as prions. Researchers are optimistic that advancements in RNA editing technology, such as CRISPR, could provide treatment for prion diseases.
The possibility of this treatment has been known since scientists first identified bacteria using natural gene editing methods to combat viruses. Recently, medical researchers from institutions such as Harvard University, the Massachusetts Institute of Technology, and Case Western University conducted a pilot study to explore CRISPR’s effectiveness against prion diseases. The research team aimed to identify defective RNA regions within the genome and modify the corresponding genes. This process involved pinpointing the start and stop codons crucial for gene expression.
In laboratory experiments, scientists collected RNA from mice infected with human prion diseases. Utilizing CRISPR technology, they modified the defective RNA at the molecular level by inserting new start and stop codons to prevent replication. They employed sgRNA designed to produce non-functional proteins. Three versions of the sgRNA were tested: sgRNA, F-sgRNA, and F+E-sgRNA.
The researchers administered a medically approved vector, specifically an adeno-associated virus loaded with modified sgRNA, into mice infected with prion disease. They hypothesized that successful intervention would halt prion replication and prevent related disorders.
To evaluate this, scientists used two groups of mice, one experimental group receiving the modified sgRNAs and a control group receiving none. At ages 6 to 9 weeks, both groups were injected with various strains of human prion disease. Subsequently, only the experimental group was treated with sgRNA between 7 to 10 weeks old.
The mice were monitored for 92 to 95 weeks, recording behavioral changes, weight fluctuation, and lifespan. Post-experiment, researchers compared the health outcomes of both groups to determine the efficacy of the treatment. The findings were promising: treated mice exhibited nearly a 60% increase in lifespan compared to their control counterparts.
To assess the experiment’s success, researchers euthanized the mice post-study and analyzed their brains. They were particularly concerned with ensuring that the edited RNA targeted the proper genes, avoiding off-target editing that could lead to unpredictable outcomes. A thorough examination for possible side effects and abnormalities not linked to prion activity was conducted.
Additionally, they assessed the prion activity to confirm the impact of CRISPR on the targeted RNA strand, focusing on prion protein levels in mice. They observed that treated mice had prion protein levels 4% to 40% lower than those in the control group, with the F+E-sgRNA treatment yielding a 43% reduction in prion levels.
The research team concluded that CRISPR gene editing holds potential for combating prion diseases in mice. However, the significant off-target editing observed could present risks in human applications due to possible adverse effects. The researchers recommend future investigations continue using rodent models until more precise editing techniques are developed. Nevertheless, these results symbolize a meaningful advance toward potential treatments for prion ailments in humans.
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Source: sciworthy.com
