Seckel syndrome

Seckel syndrome, also known as microcephalic primordial dwarfism, bird-headed dwarfism, or Seckel-type dwarfism, is a rare autosomal recessive disorder characterized by intrauterine growth restriction, severe proportionate short stature (primordial dwarfism), and marked microcephaly with intellectual disability. The condition was first described by Helmut Seckel in 1960. Multiple body systems are affected, including the skeletal, neurological, and hematological systems. Key clinical features include a distinctive facial appearance with a prominent beaked nose, receding forehead, receding lower jaw (micrognathia), and large eyes, which historically led to the term 'bird-headed dwarfism.' Patients typically have severe proportionate short stature with adult heights often below 3 feet. Microcephaly is profound, and intellectual disability ranges from mild to severe. Skeletal abnormalities may include clinodactyly, hip dislocation, and delayed bone age. Hematological abnormalities, including pancytopenia and occasionally acute myeloid leukemia, have been reported in some patients. Craniosynostosis and other skeletal anomalies may also occur. Seckel syndrome is genetically heterogeneous, with pathogenic variants identified in several genes involved in DNA damage response and centrosomal function, including ATR (SCKL1), RBBP8 (SCKL2), CENPJ (SCKL4), CEP152 (SCKL5), CEP63 (SCKL6), NIN (SCKL7), DNA2 (SCKL8), TRAIP (SCKL9), and NSMCE2 (SCKL10), among others. There is no specific cure or disease-modifying treatment. Management is supportive and multidisciplinary, involving monitoring of growth, developmental support, orthopedic care, and surveillance for hematological complications. Genetic counseling is recommended for affected families.

Common questions about Seckel syndrome