background participants

Participant 103

On this page, you will find information about a UDN participant.

Sharing information on this website is not a requirement of UDN participation. Only descriptions about participants who give explicit consent will appear here. While these participant pages are helpful to understand our participants’ stories, they do not begin to describe their diagnostic odysseys. A special thank you goes out to our participants and their families for sharing their experiences.


Male, age 5, with global developmental delay caused by a change in the MAPK8IP3 gene,

Date of Report

Jan 08, 2019


The participant had difficulties rolling over and sitting at 6 months old. He started physical therapy at 9 months after not reaching additional developmental milestones. Around the same time, he was diagnosed with nystagmus, an eye abnormality in which the eyes repetitively move horizontally. The participant developed “staring spells” and had abnormal brain electrical activity (EEG with parietal and temporal focal spikes). Currently, he has difficulty speaking (dysarthria) and has better receptive than expressive language. In addition, he has low muscle tone (neonatal hypotonia) as well as poor balance. His lack of balance has lead the participant to experience frequent falls. He has difficulty with coordination and motor planning and utilizes a walker and manual wheelchair for mobility. Lastly, the participant has repetitive behavior (stereotypy) that consists of bending his head to the right side and is often combined with hand flapping.

Symptoms / Signs
  • Global developmental delay
  • Low muscle tone (neonatal hypotonia)
  • Abnormal brain electrical activity (EEG with parietal and temporal focal spikes)
  • Eye abnormalities (nystagmus, hypometric saccades)
  • Difficulty speaking (dysarthria)
  • Reduced function of reflexes (hyporeflexia)
  • Repetitive behavior (stereotypy)
Current Treatments
Prior Treatments
Considered treatments
Previously Considered Diagnoses
  • Angelman syndrome
  • Fragile X syndrome
  • Metabolic condition
  • Microdeletion/duplication disorder
  • Myotonic muscular dystrophy
  • Prader Willi syndrome
Other Photographs
Genetic Variants of Interest

Clinicians and researchers have identified the following de novo genetic change to be causing the participant’s symptoms. Several families with children with MAPK8IP3 variants have partnered to create a website for families to connect and learn about ongoing research:

Inheritance Pattern
Position (hg19)
DNA Change
Protein Change
Autosomal dominant

If this participant sounds like you or someone you know, please contact us!


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