Phosphorylation redirected a TDP-43 segment into small particles in laboratory experiments
Original source
A Phosphorylation-Induced Micellization Switch in the Low-Complexity Domain of TDP-43. (opens in a new tab)Compass summarised this from the study's abstract.
Related topics
Phosphorylation changed how the low-complexity domain of TAR DNA-binding protein 43 (TDP-43) assembled in laboratory experiments. The phosphorylated protein formed spherical nanoparticles about 20–50 nanometres wide, while the unphosphorylated form underwent phase separation and later formed fibrils. The findings suggest phosphorylation may influence TDP-43 aggregation, but the study did not test treatments or disease outcomes.
Why this matters
TDP-43 aggregation is linked to amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration with TDP-43 pathology. This work identifies a possible molecular mechanism that could help researchers study how TDP-43 assemblies form. It was performed using simulations and purified protein in vitro, so it does not currently change treatment for people with ALS or establish that phosphorylation prevents harmful aggregates in patients.
Limitations and context
This was a mechanistic laboratory study using simulations and purified protein, not people or animal models. The authors state that it remains unclear whether the observed assemblies are stable or trapped over disease-relevant timescales. The study therefore does not establish effects on ALS risk, progression, or treatment.