background participants

Participant 142

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.


Female, age 1 with brain abnormalities (agenesis of the corpus callosum and arachnoid cyst) and chronic diarrhea caused by a change in the ARX gene (with severity impacted by her diagnosis of mosaic Turner syndrome)

Date of Report

Aug 14, 2019


The participant was noted to have a brain abnormality (agenesis of the corpus callosum) on a fetal ultrasound. Further testing during the pregnancy was positive for mosaic Turner syndrome.

At two days old, the participant began experiencing diarrhea. At 5 weeks old, she was admitted to the hospital for severe dehydration and 20-30 loose stools per day. The care team tried many different infant formulas and found that, while some lessened the participant’s diarrhea, none resolved the problem entirely. She was started on total parenteral nutrition (TPN) to maintain her needed nutrients. Over time, blended meats and vegetables have been added to her diet.

An MRI done after birth confirmed agenesis of the corpus callosum and identified an arachnoid cyst.

The participant has been developing as expected and can sit on her own, babble, and grab objects.

Symptoms / Signs
  • Brain abnormalities (agenesis of the corpus callosum, arachnoid cyst)
  • Intestinal malabsorption
  • Chronic and intractable diarrhea
  • Turner syndrome, mosaic
Current Treatments
Prior Treatments

Foley catheter

Considered treatments
Previously Considered Diagnoses
Other Photographs
Genetic Variants of Interest

Clinicians and researchers have identified the following genetic change to be causing the participant’s symptoms:

Inheritance Pattern
Position (hg19)
DNA Change
Protein Change
c.196+129_1073 +903del

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


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