Isolated ectrodactyly in a newborn with Down syndrome

Area of Science:

• Genetics
• Developmental Biology
• Clinical Medicine

Background:

• Down syndrome (DS), or trisomy 21, is the most common chromosomal abnormality in live births, characterized by dysmorphic features, congenital malformations, and cognitive impairment.
• Musculoskeletal anomalies in DS are often linked to altered collagen function.
• Ectrodactyly, a limb malformation involving a median cleft of the hand/foot, results from disrupted limb development.

Observation:

• A patient diagnosed with Down syndrome presented with ectrodactyly, specifically a split between the third and fourth fingers, resulting in four digits on each hand.
• Karyotype analysis confirmed trisomy 21 (47,XY,+21).
• No other musculoskeletal anomalies were noted in this patient.

Findings:

• This case represents the first documented instance of Down syndrome associated with ectrodactyly.
• The distinct pathogenesis of musculoskeletal issues in DS and ectrodactyly suggests a potentially coincidental occurrence.
• The patient exhibited a rare combination of trisomy 21 and limb malformation.

Implications:

• Patients diagnosed with ectrodactyly should undergo thorough evaluation for associated syndromes.
• Healthcare providers should consider the possibility of diverse organ anomalies in Down syndrome patients beyond the commonly observed features.
• This case expands the known clinical spectrum of Down syndrome and rare limb malformations.