Short answer · Medically reviewed summary · Last updated: 2026-05-08

Coffin-Siris syndrome is a rare genetic disorder characterized by developmental delays, intellectual disability, and distinctive physical features, most notably the hypoplasia or absence of the fifth digit nail or phalanx. Diagnosis is typically confirmed through clinical evaluation by a medical geneticist followed by molecular genetic testing to identify mutations in genes involved in the BAF chromatin remodeling complex. What are the early signs of Coffin-Siris syndrome? Early identification of Coffin-Siris syndrome often begins in infancy.

1 people with Coffin Siris Syndrome have shared their first-person experience on this question at DiseaseMaps.

How do I know if I have Coffin Siris Syndrome?

Name: How do I know if I have Coffin Siris Syndrome?
Creator: DiseaseMaps Editorial Team
Published: 2016-07-20UTC12:23:25.0000000

Could you have Coffin Siris Syndrome? Early signs that prompted real patients to seek diagnosis, plus medically reviewed guidance.

Coffin-Siris syndrome is a rare genetic disorder characterized by developmental delays, intellectual disability, and distinctive physical features, most notably the hypoplasia or absence of the fifth digit nail or phalanx. Diagnosis is typically confirmed through clinical evaluation by a medical geneticist followed by molecular genetic testing to identify mutations in genes involved in the BAF chromatin remodeling complex.

What are the early signs of Coffin-Siris syndrome?

Early identification of Coffin-Siris syndrome often begins in infancy. Key clinical markers include feeding difficulties, frequent respiratory infections, and hypotonia (low muscle tone). Parents may notice distinct facial features, such as a wide mouth, thick eyebrows, and long eyelashes, alongside the hallmark finding of an underdeveloped or missing nail on the fifth finger or toe. Growth delays and microcephaly are also frequently observed in children with Coffin-Siris syndrome.

How is Coffin-Siris syndrome diagnosed?

Diagnosis is a process that moves from clinical observation to definitive genetic confirmation. If you suspect Coffin-Siris syndrome, your physician should look for a pattern of symptoms rather than a single trait. Diagnostic steps include:

Detailed physical examination of skeletal features (especially digits).

Developmental and neurological assessments.

Genetic testing, specifically whole-exome sequencing or gene panels targeting the BAF complex genes (e.g., ARID1B, SMARCA4).

Brain imaging (MRI) to assess for structural differences, which are common in many, though not all, cases.

When should I consult a specialist?

You should consult a medical geneticist if there is a combination of developmental delay, intellectual disability, and the characteristic skeletal findings mentioned above. It is important to distinguish Coffin-Siris syndrome from normal variation by looking for the cluster of multisystem symptoms. If you feel your concerns are being dismissed, request a referral to a "genetics clinic" specifically, and bring a documented list of symptoms and developmental milestones to your appointment.

What are the red flags requiring urgent evaluation?

While Coffin-Siris syndrome is a chronic condition, seek urgent medical care if you observe severe respiratory distress, uncontrollable seizures, or significant failure to thrive, as these complications require immediate management regardless of the underlying genetic cause.

Next steps

Request a referral to a clinical geneticist for a formal evaluation.

Connect with the 212 members of our Coffin-Siris syndrome community on DiseaseMaps.org to share experiences.

Maintain a detailed medical binder tracking all developmental milestones and previous test results.

Visit the NIH GARD website to print clinical summary sheets to share with your primary care team.

Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or qualified health provider with questions regarding a medical condition.

References

NIH Genetic and Rare Diseases Information Center (GARD): Coffin-Siris Syndrome.

Orphanet: Rare disease database for Coffin-Siris syndrome (ORPHA:198).

OMIM (Online Mendelian Inheritance in Man): Entry #135900.

Coffin-Siris Syndrome Foundation: Patient-focused resources and clinical updates.

Author: DiseaseMaps Editorial Team

Reviewed against authoritative medical sources (NIH GARD, Orphanet, OMIM)

Last updated: 2026-05-08

Sources cited: NIH Genetic and Rare Diseases Information Center (GARD): Coffin-Siris Syndrome. · Orphanet: Rare disease database for Coffin-Siris syndrome (ORPHA:198). · OMIM (Online Mendelian Inheritance in Man): Entry #135900. · Coffin-Siris Syndrome Foundation: Patient-focused resources and clinical updates. · WHO

Medical disclaimer: This information does not substitute professional medical advice. Always consult your doctor before making health decisions.

Source: DiseaseMaps.org

2 answers

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Posted May 22, 2018 by starjoint 200