Contribution of Family History in Co-occurring Down Syndrome and Ehlers-Danlos Syndrome

Area of Science:

• Genetics
• Pediatrics
• Neurology

Background:

• Down syndrome (DS) is frequently associated with hypotonia in children, which typically improves with age.
• Persistent hypotonia and ligamentous hyperlaxity in a child with DS may indicate an additional underlying condition.
• Ehlers-Danlos Syndrome-Hypermobility type (EDS-HMT) is a connective tissue disorder characterized by joint hypermobility and hypotonia.

Purpose of the Study:

• To report a case of a child with Down syndrome and Ehlers-Danlos Syndrome-Hypermobility type.
• To highlight the importance of investigating developmental delays in DS patients that exceed typical expectations.
• To emphasize the need for timely diagnosis of inherited disorders like EDS-HMT in individuals with DS.

Main Methods:

• Case presentation of a 32-month-old female with Down syndrome.
• Clinical evaluation including assessment of hypotonia and ligamentous hyperlaxity.
• Diagnosis of Ehlers-Danlos Syndrome-Hypermobility type based on family history and clinical findings.

Main Results:

• The patient, diagnosed with DS, presented with persistent hypotonia and significant ligamentous hyperlaxity.
• The co-occurrence of EDS-HMT led to a global developmental delay more pronounced than typically observed in age-matched peers with DS.
• Family history was instrumental in diagnosing EDS-HMT.

Conclusions:

• Individuals with Down syndrome exhibiting developmental profiles significantly below expected norms warrant further clinical investigation.
• Early and accurate diagnosis of co-occurring inherited disorders such as EDS-HMT is essential for providing appropriate interventional therapies.
• Identifying EDS-HMT in a DS patient facilitates screening and diagnosis in at-risk family members.