Raine syndrome: an overview.

Area of Science:

• Genetics
• Pediatrics
• Radiology

Background:

• Raine syndrome (RS) is a rare, severe bone dysplasia with a prevalence under 1 in 1,000,000.
• Characterized by generalized osteosclerosis, distinctive facial anomalies, and brain abnormalities, RS was initially considered lethal but has seen childhood survivors, necessitating phenotype definition.
• The skeletal dysplasia primarily impacts craniofacial development, causing proptosis, midface hypoplasia, and a depressed nasal bridge.

Purpose of the Study:

• To provide a comprehensive review of Raine syndrome.
• To detail the clinical manifestations, molecular basis, diagnostic approaches, and management strategies for RS.
• To highlight the importance of early diagnosis and neonatal intensive care for affected newborns.

Main Methods:

• Literature review of clinical manifestations, molecular genetics, diagnosis, and management of Raine syndrome.
• Analysis of radiological findings, including diffuse osteosclerosis of the skull base and long bones.
• Discussion of genetic mutations in FAM20C and their role in biomineralization.

Main Results:

• Raine syndrome is caused by biallelic mutations in the FAM20C gene, encoding a Golgi casein kinase crucial for protein phosphorylation in biomineralization.
• Facial appearance and radiological findings are key to clinical diagnosis, with molecular testing of FAM20C providing confirmation.
• Differential diagnoses include Desmosterolosis and congenital cytomegalovirus infection.

Conclusions:

• Early recognition and admission to a neonatal intensive care unit are critical due to potential respiratory distress at birth.
• Accurate diagnosis relies on a combination of clinical, radiological, and molecular findings.
• Ongoing research is vital for refining the understanding and management of this complex bone dysplasia.