RNA Modification Linked to TDP-43 Buildup

Researchers at Michigan Medicine recently discovered that a protein called TDP-43 is present in almost all amyotrophic lateral sclerosis (ALS) cases observed by the team. This progressive and fatal neurodegenerative disease, also known as Lou Gehrig’s disease, is characterized by the death of nerve cells, which TDP-43 may contribute to by regulating RNA processing. Excess TDP-43 in patients’ cells was previously found to destabilize RNA, and now a new study suggests that a modification to RNA called methylation may play a pivotal role in TDP-43-related neurodegeneration.

RNA methylation is a common modification that impacts RNA stability, transport, and translation. Through sequencing analysis, researchers at Michigan Medicine found that methylation strongly influences the binding of TDP-43 to its RNA targets. They also observed high levels of RNA methylation in ALS patients’ end-stage tissues. However, it is still unclear how RNA methylation, TDP-43 buildup, and loss of brain cells are connected.

Previous studies have shown that RNA hypermethylation characterizes some neurodegenerative diseases and total levels of RNA methylation in the nervous system increase with age. Environmental exposure can also modify RNA methylation, and its presence in ALS opens up a range of possibilities for research into a disease intimately linked to environmental exposure.

The study, published in Molecular Cell, could lead to new avenues of research for ALS and frontotemporal dementia, which are intimately linked to TDP-43 buildup. By understanding the connection between RNA methylation, TDP-43, and neurodegeneration, researchers may be able to develop new therapies for these devastating diseases.