| In more than 99.9 percent of cases of Rett Syndrome, the genetic mutation is spontaneous. |
Random mutations are usually not inherited or passed from one generation to the next. In a very small percentage of families—about 1 percent—Rett mutations are inherited and passed on by female carriers. Scientists are working to learn more about these families to understand how this inherited mutation arises.
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What is Rett Syndrome?
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