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Living with Cardiac anomalies - developmental delay - facial dysmorphism syndrome

A condition that causes developmental delay, intellectual disability, and small differences in facial features.

Understanding Cardiac anomalies - developmental delay - facial dysmorphism syndrome

Cardiac anomalies - developmental delay - facial dysmorphism syndrome, also called MED13L syndrome, is a developmental disorder.

It involves developmental delay, intellectual disability, and minor differences in facial features. Some people also have seizures (epilepsy) or heart defects present from birth. Delay and disability are usually moderate to severe. Early signs include low muscle tone and late motor skills. It starts in the newborn and infant years.

Signs & symptoms

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

  • Delayed development overall (global developmental delay)
  • Delayed speech and language
  • Moderate intellectual disability
  • Low muscle tone (hypotonia)
  • Delayed motor skills
  • Autistic behavior

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, genetic specialists and heart and blood vessel specialists.

  3. Consider genetic testing

    Changes in MED13L 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); Heart and blood vessel specialists (cardiologists)
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 Simons Searchlight and other patient organizations
  • 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
Can MED13L genetic testing confirm the diagnosis?
Should my child have a heart check and seizure monitoring?
What therapies can support speech and movement?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Dominant
GenesMED13L

Changes in the MED13L gene cause this condition. It is inherited in an autosomal dominant way, so one changed copy of the gene can cause it.

GeneticNeurological

Also known as: asadollahi-rauch syndrome; asras; developmental delay-facial dysmorphism syndrome due to med13l deficiency; developmental delay, facial dysmorphism syndrome due to med13l deficiency; developmental delay, facial dysmorphism syndrome due to mediator complex subunit 13 like deficiency; impaired intellectual development and distinctive facial features with or without cardiac defects

Patient organizations

  • Simons SearchlightCardiac anomalies - developmental delay - facial dysmorphism syndrome · United States
  • MED13L FoundationCardiac anomalies - developmental delay - facial dysmorphism syndrome · United States
Source: NIH GARD · Cardiac anomalies - developmental delay - facial dysmorphism syndromeGARD ID 17588 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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