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The "silent mutations" - changes in genetic material - are likely to have no obvious impact on older fathers' own children, but they may build up through subsequent generations, or interact with other genes and environmental factors, to increase the chance of their grandchildren developing the condition, the researchers say.
BBC: Grandparents 'may relay autism risk to grandchildren'
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Dr. Pedersen, a professor in the department of medical epidemiology and biostatistics at Karolinska Institute, currently studies dementia among twins, including the recent research showing that an identical sibling of a twin with dementia has an increased risk of also developing the condition.
WSJ: Twins Health Registry Is Treasure Trove for Medical Research
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"Once you fall into that glucose range, you are considered at high risk for developing the condition again, " says Magee.
CNN: Reversing diabetes is possible