Researchers have identified clusters of genes that have been associated with the buildup of the protein tau and neuronal death – the hallmarks of dementia.
The Role of Tau in Dementia
Alzheimer’s, the most common form of dementia, affects about 5.7 million people in the United States alone and is expected to jump to some 14 million by 2050. There is no cure for dementia and scientists have yet to find a safe and effective way to slow its progression.
However, it is well known that tau plays a role in several types of dementia. Health nerve cells have a framework made of microtubules, which helps the cell keeps its form. The protein tau supports the microtubules.
But sometimes, tau can get tangled and clumped – called neurofibrillary tangles. When this happens, scientists believe that the nerve cells may be damaged. They may not be able to support the microtubules and will eventually die. As more cells die, the symptoms of dementia appear.
Scientists Work to Prevent Neurofibrillary Tangles
But recently, the journal Nature Medicine published a study in which researchers tried to find the genetic origin of neurofibrillary tangles and figure out a way to prevent them from occurring at all.
Science has already identified specific genes linked to Alzheimer’s, but their role in disease progression has remained not known. So, researchers used a modeling technique called systems biology to study how proteins, genes, and cell types affect each other.
The researchers studied a model of a mouse with frontotemporal dementia, a particular form of dementia which involves the same processes of Alzheimer’s and supranuclear palsy, another form of dementia.
Study authors suggest that early animal experiments may not have translated well to humans because they have typically involved only one strain of inbred mouse. So, for this study, researchers used three genetically different strains of mice.
They studied a genetic process that is associated with a mutation which can cause tau to build up in certain types of dementia. After combining the data, researchers were able to identify two gene clusters that were associated with tau buildup and neuronal death in each strain of mice.
The scientists were able also to identify that the human brain has similar processes, which increased the strength of the researcher’s findings. Then the scientists analyzed a database of experimental drugs to find ones that could interfere with the genetic process and possibly prevent the death of the cells.
Comprehensive Study is a First Step Towards Treating Dementia
When they ran laboratory tests, the researchers determined that they were able to interrupt the degeneration of human cells. Calling it the most comprehensive study published to date, researchers said their identification of the source of neurodegeneration in mice and humans could be the first step on an important roadmap in the development of new medications for Alzheimer’s disease and other forms of dementia.
While there is certainly a significant amount of research that still needs to be done in the development of medications that could be used in humans and the research is in its beginning stages, but definitely an encouraging step in the right direction.