Huntington disease is often transferred to offspring before a parent knows of the genetic possibility of this disease,because

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Signs of mental deterioration and involuntary muscle movements do not appear until approximately age 40.The delayed onset means the parent may transmit the disorder to offspring before he or she knows they have the disorder.Symptoms of Huntington's disease are not necessarily mild,and are not the reason for delayed identification of the genetic susceptibility.Genetic testing for the disease is possible.The genetic alteration is expressed if the triplet repeats are greater than 40.

Huntington Disease Is Often Transferred to Offspring Before a Parent