Learn about whether your child’s unexplained low muscle tone could be caused by AADC Deficiency

When your child’s low muscle tone (hypotonia) goes unexplained, a rare genetic disorder may be the cause

This website provides information about one rare disorder called Aromatic L-amino Acid Decarboxylase (AADC) deficiency, which can cause hypotonia and other symptoms in children.

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An important message to the AADC Community

Watch one family talk about their experience with AADC deficiency and the journey they took to get a diagnosis for their daughter.

“She’s an angel. We feel like we’ve been blessed with an angel, and Jillian’s got an amazing spirit.”—Kelly Heger, mother and caregiver of Jillian Heger

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This website can help you:

Learn about the symptoms of AADC deficiency

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Talk to your doctor if you think your child should be tested for this rare disorder