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Living with Pierpont syndrome

A rare genetic condition with low muscle tone, feeding trouble, developmental delay, seizures, and unusual fat pads on the feet.

Understanding Pierpont syndrome

Pierpont syndrome is a rare genetic condition with several differences present from birth.

Babies have low muscle tone after birth, feeding difficulties that last, and moderate to severe developmental delay. Seizures, especially absence seizures, can occur. A distinctive feature is fat pads on the soles near the heels, which may become less noticeable over time. There are also certain facial features.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Low muscle tone (hypotonia)
  • Feeding difficulties
  • Delays in development
  • Intellectual disability
  • Fat pads on the soles near the heels
  • Deep creases on the palms and soles

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in TBL1XR1 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What seizure types should we watch for?
What therapies help with feeding and development?
Would TBL1XR1 testing help our family?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Dominant
GenesTBL1XR1

Changes in the TBL1XR1 gene cause this condition. It is autosomal dominant, which means one changed copy of the gene is enough to cause it.

GeneticNeurological

Also known as: plantar lipomatosis-facial dysmorphism-developmental delay syndrome; plantar lipomatosis-unusual facies-developmental delay syndrome; plantar lipomatosis, facial dysmorphism, developmental delay syndrome; prpts

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Pierpont syndromeGARD ID 17885 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Pierpont syndrome.

Explore the Pierpont syndrome blog

Explore research for Pierpont syndrome

Explore actively recruiting Pierpont syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Pierpont syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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