Alzheimer’s Late: What’s Behind the New Diagnosis
Okay, here’s a breakdown of the key information from the provided text, focusing on LATE (Limbic-predominant Age-related TDP-43 Encephalopathy):
What is LATE?
* A distinct form of dementia: It’s now recognized as separate from Alzheimer’s disease, though it can occur with Alzheimer’s changes in the brain.
* Cause: Caused by the malfunction of the protein TDP-43.This protein normally regulates genes, but in LATE, it clumps up and damages nerve cells.
* Affected Brain Area: Specifically affects the hippocampus (the memory center), frequently enough causing it to shrink more than in Alzheimer’s.
How is it different from Alzheimer’s?
* Protein Build-up: Alzheimer’s involves amyloid and tau proteins. LATE involves TDP-43.
* Symptoms:
* LATE: Word-finding difficulties and memory problems. Less impact on planning and everyday organization.
* Alzheimer’s: More impact on planning and everyday organization.
* Other symptoms: LATE may increase distressing symptoms, including psychotic episodes or incontinence.
How was it discovered?
* Initiated by Peter Nelson: A neuropathologist who noticed a important number of dementia cases (around a third) didn’t fit existing diagnoses.
* Collaboration: He brought together researchers in 2018, and they defined and named the disease in 2019.
How common is it?
* Autopsy studies: Show TDP-43 deposits significant enough to cause cognitive problems in about 25% of older people’s brains.
Why is it significant to distinguish LATE from Alzheimer’s?
* New Drugs: New anti-amyloid drugs are designed to target amyloid deposits (found in Alzheimer’s). They will not work for people with LATE alone because LATE doesn’t involve amyloid. A precise diagnosis is crucial to ensure patients receive appropriate treatment.
in essence, LATE is an increasingly recognized form of dementia with a different underlying cause and symptom profile than Alzheimer’s, and accurate diagnosis is becoming more critically important with the advent of new treatments.