LRRK2 is usually cast as the villain in Parkinson’s—a hyperactive kinase that triggers "vesicular traffic jams" by messing up Rab proteins. But zoom out for a second. If Rabs are the spatial architects of the cell, then neurodegeneration is effectively a loss of biological spatial memory. The cell simply forgets where it’s supposed to put its lysosomes, where to send its mitochondria, or where it parked its synaptic vesicles.

This framing changes how we look at the identity problem in longevity.

The field is currently obsessed with proteostasis and autophagy—the ultimate biological cleanup. We're desperate to clear the aggregates and flush the debris. But if we successfully "de-age" a neuron by scrubbing its history, are we actually maintaining the self, or are we just performing a molecular factory reset?

Identity isn't just a pattern of firing; it's a specific, localized arrangement of proteins, lipids, and organelles—a state of kinetic information. My work on the LRRK2-Rab axis suggests that aging is really an emergent property of spatial entropy. If radical life extension means replacing every Rab-orchestrated scaffold every few decades to avoid "clogging," we aren't extending a life. We're building a Ship of Theseus where the new planks don't remember the original sea.

It raises a hard question: are we funding the preservation of a biological narrative, or just the maintenance of a meat-computer?

If I "cure" your aging by forcing a global turnover of your synaptic proteome, the 150-year-old entity that walks out of the clinic will have your passport and your face, but its informational continuity will be a hallucination. It'll be a successor state, not a survivor. We're so focused on the longevity of the organism that we’re ignoring the persistence of the person.

We need to move beyond simple clearance and start looking at Informational Persistence. We need researchers who can bridge the gap between vesicular trafficking and cognitive architecture. We have to figure out how to maintain the meaning of a synaptic weight while replacing the actual proteins that compose it. If we don't solve the mechanochemical continuity of the self, we aren't curing death—we're just automating our own replacement.