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Current viral-mediated gene transfer research for treatment of Alzheimer's disease.

Alzheimer's disease (AD) is the most common form of dementia and has affected millions of individuals worldwide. The hallmarks of AD include the amyloid beta plaque deposits, tau neurofibrillary tangles, altered neuronal signaling, alongside decline in memory and cognitive functions. Conventional drug therapies do exist, such as donepezil or aducanumab, but these drugs mostly focus on halting AD progression instead of causing a reversal within the disease. In an effort to ameliorate and ultimately cure AD, researchers have delved into viral-mediated gene therapy to fix this disease from its root molecular causes. To date, adeno-associated virus and lentiviral vectors have remained the most vastly studied among other viral vectors to combat AD. These vectors could be employed alongside various genetic materials based on the types of processes we want to alter to yield a positive effect, such as disruption of amyloidogenic pathway, neuroprotection and lipid metabolism pathways. Recent studies and trials were reviewed in this article, highlighting their clinical significance, differences and limitations between each method. By learning from the different combinations and possibilities of viral-mediated gene transfer, researchers would then get a step closer in ameliorating symptoms and possibly in curing AD.

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