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From: Nathan E. Lavid, MD
Date: 13 Oct 2009
Time: 14:12:55 -0500
Remote Name: 75.142.104.151
This is a great question, and genetics are not the complete answer to why stuttering would emerge in a family. While familial and twin studies of those who stutter reveal a genetic component, study of identical (monozygotic) twins does not reveal 100 percent concordance for stuttering, which means that some pairs of twins, who share the same genetic information, have a sibling who does not stutter. As with the many medical conditions with a genetic component that does not demonstrate full concordance in identical twins, such as Type 2 Diabetes, there must be some environmental factors that influence the emergence of the condition. What these environmental factors in stuttering are, is unknown.