Kaufman oculocerebrofacial syndrome

Lore & Background

Kaufman oculocerebrofacial syndrome is characterized by severe intellectual disability, brachycephaly, upslanting palpebral fissures, eye abnormalities, and a highly arched palate. Additional signs include microcephaly, constipation, muscular hypotonia, and nystagmus. The condition is caused by a mutation in the UBE3B gene, which encodes an E3 ubiquitin protein ligase important in the ubiquitin-proteasome system that removes degraded proteins. At least 15 mutations in this gene lead to an unstable UBE3B protein, disrupting this system.

Reader's Guide

Kaufman oculocerebrofacial syndrome is significant as an extremely rare genetic disorder that illustrates the role of the ubiquitin-proteasome system in neurodevelopment. Its diagnosis relies on molecular testing, along with growth assessment, thyroid function evaluation, kidney ultrasound, and echocardiogram. Management includes surveillance of growth and contractures, thyroid hormone replacement, speech therapy, and hearing aids. The disputed case count highlights the rarity and diagnostic challenges of the condition. Its legacy lies in advancing understanding of UBE3B-related disorders and the importance of ubiquitin pathways in human disease.

Did You Know?

• The syndrome was characterized in 1971.
• As of 1995, only eight cases had been identified.
• The condition is caused by mutation in the UBE3B gene on chromosome 12.
• At least 15 mutations in the UBE3B gene have been associated with the disorder.