Kenny–Caffey syndrome

Kenny-Caffey Syndrome (KCS) is a rare genetic disorder characterized by growth retardation, cortical thickening of the long bones, and hypocalcemia due to hypoparathyroidism. The syndrome is classified into two types: Type 1, which is autosomal recessive and more severe, often associated with neurological impairments; and Type 2, which is autosomal dominant, generally less severe, and does not typically involve neurological issues. Both types share similar skeletal and calcium-related abnormalities.

Etiology

Kenny-Caffey Syndrome is caused by mutations in specific genes. Type 1 is associated with mutations in the TBCE gene, which plays a role in tubulin folding and microtubule dynamics. Type 2, on the other hand, involves mutations in the FAM111A gene. The exact mechanisms by which these mutations lead to the symptoms of KCS are not fully understood, but they are believed to affect bone development and calcium homeostasis.

Symptoms

Common symptoms of Kenny-Caffey Syndrome include:

• Growth retardation
• Delayed closure of the fontanelles
• Microcephaly (abnormally small head size)
• Ocular abnormalities
• Hypocalcemia (low calcium levels in the blood)
• Hypoparathyroidism (underactive parathyroid glands)
• Cortical thickening of the long bones

Patients may also exhibit additional features such as dental anomalies and mild to moderate intellectual disability, particularly in KCS Type 1.

Diagnosis

Diagnosis of Kenny-Caffey Syndrome is based on clinical features, radiological findings, and genetic testing. The presence of hallmark symptoms such as growth retardation, specific skeletal abnormalities, and hypocalcemia, along with the identification of causative genetic mutations, can confirm the diagnosis.

Treatment

There is no cure for Kenny-Caffey Syndrome, and treatment is symptomatic and supportive. Management strategies may include:

• Calcium and vitamin D supplementation to manage hypocalcemia
• Regular monitoring of calcium levels and bone density
• Growth hormone therapy to address growth retardation, although its effectiveness varies
• Specialized care for other symptoms such as ocular abnormalities and dental issues

Prognosis

The prognosis for individuals with Kenny-Caffey Syndrome varies depending on the severity of symptoms and the effectiveness of management strategies. Early diagnosis and treatment can improve quality of life and mitigate some of the complications associated with the syndrome.

See also

• Hypoparathyroidism
• Growth retardation
• Genetic disorder

Kenny–Caffey syndrome Resources
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