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Living with FBLN1-related developmental delay-central nervous system anomaly-syndactyly syndrome

A rare genetic syndrome with delayed development, intellectual disability, speech problems and webbed fingers or toes.

Understanding FBLN1-related developmental delay-central nervous system anomaly-syndactyly syndrome

FBLN1-related developmental delay-central nervous system anomaly-syndactyly syndrome is a rare genetic syndrome with multiple birth differences.

It includes delayed motor development, intellectual disability, slurred speech, and webbed fingers or toes (syndactyly). Undescended testes can occur. Macular degeneration, brain shrinkage, and spinal cord pressure have also been reported. It is present from birth.

Signs & symptoms

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

  • Delayed walking and motor skills
  • Delayed speech
  • Intellectual disability
  • Webbed fingers or toes (syndactyly)
  • Macular degeneration
  • Undescended testes

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 FBLN1 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
Should we have genetic testing for the FBLN1 gene?
How often should eyes be checked for macular problems?
Which therapies can support development and speech?

Quick facts

Symptoms usually startNewborn
InheritanceAutosomal Recessive
GenesFBLN1

A change in the FBLN1 gene causes it. It is autosomal recessive, which means a child inherits a changed copy of the gene from each parent.

GeneticNeurological

Also known as: fbln1-related developmental delay, central nervous system anomaly, syndactyly syndrome; fibulin 1-related developmental delay, central nervous system anomaly, syndactyly syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · FBLN1-related developmental delay-central nervous system anomaly-syndactyly syndromeGARD ID 21717 · 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 FBLN1-related developmental delay-central nervous system anomaly-syndactyly syndrome.

Explore the FBLN1-related developmental delay-central nervous system anomaly-syndactyly syndrome blog

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