A 75-year-old man who was genetically predisposed to develop Alzheimer’s has yet to show any signs of the disease, according to a recent study. The research suggests that his lifelong exposure to high temperatures while working as a naval mechanic may have played a key role in protecting him from the condition.
Doug Whitney inherited a rare genetic mutation that caused many members of his family to experience cognitive decline in their early 50s. However, Mr. Whitney remains mentally sharp and active. Scientists believe that his exposure to high heat during his work in ship engine rooms could be the reason for this unusual resilience.
People who inherit genes associated with Alzheimer’s typically begin showing symptoms at an early age, sometimes as young as their 30s or 40s. But a small number of individuals, known as “exceptional resilience mutation carriers,” avoid the disease altogether. These people are considered crucial in the search for Alzheimer’s treatments. Mr. Whitney is one of only three such cases identified so far.
“When he first came to Washington University School of Medicine with his cousin, he was 10 years past the typical age of onset for his family,” said neurologist Jorge Llibre-Guerra, the author of the study published in the Journal of Alzheimer’s Disease. “It was a big surprise to discover that he was actually a mutation carrier.”
Mr. Whitney carries a mutant form of the PSEN2 gene, which is responsible for early-onset Alzheimer’s in all other members of his family. “It’s really important to me to figure this out,” he said. “My mom had 13 brothers and sisters, and 10 died before they were 60. It’s been a plague.”
The PSEN2 mutation is linked to an overproduction of amyloid protein, which builds up in the brain and contributes to Alzheimer’s progression. In the second stage of the disease, there is usually a build-up of tau protein in the brain. However, Mr. Whitney’s body seems to be preventing the mutation from fully taking hold.
“If we can uncover the mechanism behind this resilience, we could try to replicate it with a targeted therapy designed to delay or prevent the onset of Alzheimer’s,” Dr. Llibre-Guerra said.
Brain scans of Mr. Whitney show a significant accumulation of amyloid protein, but only a localized concentration of tau in one area. His brain fluid also contains significantly higher-than-normal levels of “heat shock” proteins. These proteins are produced by cells in response to stress, such as high heat or UV light, and act as chaperones that stabilise, fold, and repair other proteins.
“We don’t yet understand how or if heat shock proteins may be mediating the effect,” Dr. Llibre-Guerra said. “However, in this case, they may be involved in preventing aggregation and misfolding of tau proteins.”
The researchers suspect that Mr. Whitney’s work as a shipboard mechanic may have left him with elevated levels of heat shock proteins. “We highlight evidence from preclinical, clinical, and epidemiological studies suggesting that elevated body temperature promotes tau clearance,” they wrote in the study.
“This observation invites deeper investigation into thermo-regulation as a modifiable factor in tau homeostasis and Alzheimer’s disease vulnerability, with implications for both biomarker interpretation and therapeutic strategies.”
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