Pseudo-TORCH syndrome type 1

Pseudo-TORCH syndrome type 1 (also known as Baraitser-Reardon syndrome or pseudo-TORCH syndrome) is a rare autosomal recessive genetic disorder caused by mutations in the OCLN gene, which encodes occludin, a tight junction protein. The condition mimics the clinical features of congenital TORCH infections (Toxoplasmosis, Other agents, Rubella, Cytomegalovirus, Herpes simplex) but occurs without any evidence of actual infectious exposure. It primarily affects the central nervous system and presents at birth or prenatally with intracranial calcifications, microcephaly, cerebral atrophy, ventriculomegaly, and white matter abnormalities. Additional features may include thrombocytopenia, hepatosplenomegaly, elevated liver enzymes, and petechiae, further mimicking a congenital infection. The neurological involvement is typically severe, leading to significant developmental delay, intellectual disability, seizures, and spasticity. Some affected infants may also demonstrate cortical visual impairment and hearing loss. The condition can be identified prenatally or at birth when imaging reveals characteristic brain calcifications in the absence of positive serological testing for TORCH pathogens. The prognosis is generally poor, with many affected individuals experiencing progressive neurological deterioration and early mortality, though the clinical course can vary. There is currently no curative treatment for Pseudo-TORCH syndrome type 1. Management is supportive and symptomatic, focusing on seizure control with antiepileptic medications, nutritional support, physical therapy, and management of other complications as they arise. Genetic counseling is recommended for affected families, as carrier parents have a 25% recurrence risk with each pregnancy. Prenatal diagnosis is possible through molecular genetic testing when the familial mutations are known.

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