Familial vertebral segmentation defects, Sprengel anomaly, and omovertebral bone with variable expressivity

Area of Science:

• Genetics
• Pediatrics
• Skeletal Dysplasias

Background:

• Sprengel anomaly, omovertebral bones, and vertebral segmentation defects are rare congenital conditions.
• Genetic factors are implicated in skeletal dysplasias and congenital anomalies.
• Autosomal dominant inheritance patterns are observed in various genetic syndromes.

Observation:

• A 10-year-old boy presented with a unique combination of Sprengel anomaly, omovertebral bones, and vertebral segmentation defects (cervical, thoracic, sacral).
• Additional features included hypertelorism, downslanting palpebral fissures, ptosis, webbing, and thenar/hypothenar hypoplasia, along with moderate intellectual delay.
• Radiological findings revealed a small pelvis and 11 pairs of ribs.

Findings:

• The proband's condition, including segmentation defects and omovertebral bones, was not found in existing literature.
• Affected family members (mother, father, paternal cousin) exhibited some similar features, indicating familial occurrence.
• The inheritance pattern is consistent with autosomal dominant inheritance, displaying significant variability in expression, potentially including homozygosity in the proband.

Implications:

• This case highlights a potentially novel genetic syndrome with a wide spectrum of phenotypic manifestations.
• Understanding this condition's genetic basis and inheritance pattern is crucial for genetic counseling and family planning.
• Further research is needed to identify the specific gene(s) involved and elucidate the molecular mechanisms underlying this rare disorder.