LATE (Limbic-predominant TDP-43 Encephalopathy)
LATE is a recently named, common cause of memory loss in people over 80 that looks a lot like Alzheimer's but involves a different protein, TDP-43; learn the symptoms, how it differs from Alzheimer's, and what it means for diagnosis and treatment.
Last reviewed: October 2026
For decades, when an older person developed slowly worsening memory loss, doctors assumed it was almost always Alzheimer's disease. Brain research over the past several years has shown the picture is more complicated. One important discovery is a condition called LATE, short for limbic-predominant age-related TDP-43 encephalopathy.
The name is a mouthful, but each part means something:
- Limbic-predominant – it mainly affects the brain's limbic system, which includes memory centers like the The Hippocampus and the amygdala
- Age-related – it is most common in people over 80
- TDP-43 – the protein involved
- Encephalopathy – a disease affecting the brain
What is TDP-43?
TDP-43 is a protein that normally helps control how genes are used inside cells. The National Institute on Aging (NIA) explains that in LATE, this protein becomes misfolded and clumps in brain cells, and these deposits are associated with damage to memory areas such as the hippocampus.
TDP-43 clumps also occur in other diseases, including ALS (amyotrophic lateral sclerosis) and some forms of Frontotemporal Dementia. LATE is different: it affects older people and involves a more limited set of brain regions, according to the 2019 expert working group that named the condition.
How common is it?
LATE appears to be common. The NIA reports that autopsy studies of more than 6,000 people, with an average age at death of 88, found that:
- About 40% had TDP-43 deposits associated with LATE
- LATE was linked to problems with memory and thinking in about 25%
- Just over half of those with LATE also had Alzheimer's-related brain changes
As more people live into their 80s and 90s, experts expect LATE to become an even larger public health issue.
Symptoms
The NIA notes that symptoms of LATE are similar to Alzheimer's:
- Problems with memory
- Difficulty thinking and making decisions
- Trouble finding the right words
- Wandering or getting lost
Mayo Clinic adds that people with LATE may repeat themselves, misplace things, and eventually have trouble with daily tasks like dressing, cooking or paying bills.
How LATE differs from Alzheimer's
| LATE | Alzheimer's disease | |
|---|---|---|
| Main protein | TDP-43 | Amyloid and tau |
| Typical age | Usually over 80 | Most often after 65 |
| Pace | Often slower decline | Varies; often faster than LATE alone |
| Main symptoms | Mostly memory | Memory, plus language, planning, visual skills |
| Test in living people | None yet | PET, spinal fluid and blood tests available |
Mayo Clinic notes that memory decline in LATE alone is often slower and milder than in other dementias. But when LATE occurs together with Alzheimer's—which is common—decline tends to be faster than with either alone. This is one form of Mixed Dementia.
How is it diagnosed?
Right now, LATE can only be confirmed after death, by examining the brain, the NIA says. Researchers are working on blood tests and scans that could detect it in living people.
In practice, doctors may suspect LATE when:
- The person is very old, often in their 80s or 90s
- Memory loss is the main problem and progresses slowly
- MRI shows shrinkage of the hippocampus
- Tests for Alzheimer's proteins (amyloid PET, spinal fluid or blood tests) are negative or don't fully explain how severe the memory loss is
Why it matters
Recognizing LATE matters for several reasons:
- Diagnosis: Some people told they have Alzheimer's may actually have LATE, or both.
- Treatment: Anti-amyloid drugs like Lecanemab (Leqembi) and Donanemab (Kisunla) target amyloid, not TDP-43. A person whose memory loss is mainly from LATE may not benefit as much. Ask your doctor how biomarker results fit your symptoms.
- Research: Clinical trials may need to account for LATE when testing Alzheimer's drugs.
- Expectations: Knowing that LATE often progresses slowly may help families plan.
Treatment and care
There is no specific treatment for LATE yet. Care focuses on:
- Managing symptoms, sometimes with medicines used for Alzheimer's, as recommended by a doctor
- Treating other health problems that affect thinking, such as hearing loss, depression and poor sleep
- Practical supports: routines, memory aids, home safety and caregiver support (see Caregiving Guide: Where to Start and Memory Aids and Tools)
How research is moving forward
Much of what we know about LATE came from people who donated their brains to research after death. The NIA highlights the value of brain donation programs at its Alzheimer's Disease Research Centers. See Brain Donation and Joining a Clinical Trial.
Where to get help
- Alzheimer's Association 24/7 Helpline: 800-272-3900
- NIA ADEAR Center: 800-438-4380
See also Alzheimer's Disease and What Is Dementia?.
Sources
- National Institute on Aging: What Is Limbic-Predominant Age-Related TDP-43 Encephalopathy (LATE)?
- Nelson PT et al. Limbic-predominant age-related TDP-43 encephalopathy (LATE): consensus working group report. Brain, 2019
- Mayo Clinic: Limbic-predominant age-related TDP-43 encephalopathy (LATE)
Not medical advice. This article is general information, not a diagnosis or treatment plan for any individual. Talk with a doctor about your situation.
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