FILE - A section of a human brain with Alzheimer's disease is displayed at the Museum of Neuroanatomy at the University at Buffalo, in Buffalo, N.Y., Oct. 7, 2003. A long-feared gene appears to do more than raise peoples risk of Alzheimers: Inheriting two copies can cause the mind-robbing disease, according to research published in the journal Nature Medicine on Monday, May 6, 2024.
An estimated 15% of Alzheimer’s patients carry two copies of APOE4, meaning those cases “can be tracked back to a cause and the cause is in the genes,” Fortea said. Until now, genetic forms of Alzheimer’s were thought to be only types that strike at muchScientists say the research makes it critical to develop treatments that target the APOE4 gene.
APOE4 has long been labeled the biggest genetic risk factor for late-in-life Alzheimer’s, with two copies risker than one. About 2% of the global population is estimated to have inherited a copy from each parent.To better understand the gene’s role, Fortea’s team used data from 3,297 brains donated for research and from over 10,000 people in U.S. and European Alzheimer’s studies. They examined symptoms and early hallmarks of Alzheimer’s such as sticky amyloid in the brain.
The drug Leqembi works by clearing away some sticky amyloid but Sperling said it’s not clear if carriers of two APOE4 genes benefit because they have such a high risk of a side effect from the drug – dangerous brain swelling and bleeding. One research question is whether they’d do better starting such drugs sooner than other people.
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