Prof Julie Williams' team has identified 92 genes which increase the risk of having the condition.
affects the brain and is the most common cause of dementia - one of the UK's biggest killers of the over-50s.Alzheimer's affects more than 850,000 people in the UK, but over-65s are more susceptible
"Once you know where to start looking then you can study the effects which genes have on specific brain activity," she said."For example we now know that defective genes changing the way immune cells called microglia work. "Of course synapses are the connections between neurons, so if they get eliminated when they shouldn't then you lose connections, you lose thought, you lose memories."Prof Williams said "if you have the right combination of genes there's nothing you can do to prevent Alzheimer's"
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