Rett Syndrome in Males: The Different Clinical Course in Two Brothers with the Same Microduplication MECP2 Xq28

Area of Science:

• Neuroscience
• Genetics
• Epigenetics

Background:

• Rett syndrome (RTT) is a rare neurodevelopmental disorder primarily affecting females, caused by mutations in the methyl-CpG binding protein 2 (MECP2) gene.
• RTT typically follows a period of normal development with subsequent loss of skills, motor impairment, and multi-organ dysfunction.
• Due to its X-linked dominant inheritance, RTT was historically considered lethal in males, though rare cases are documented.

Observation:

• This report details an 11-year-old male diagnosed with a MECP2 Xq28 microduplication.
• The patient is currently alive, contrasting with his older brother who had the same mutation but died at age 9.

Findings:

• The study investigates how MECP2's role as an epigenetic modulator and X-chromosome inactivation patterns may explain the differential lethal outcomes in males with the same MECP2 microduplication.
• This suggests complex genetic and epigenetic interactions influence RTT presentation and severity in males.

Implications:

• Further research is crucial to better understand and characterize Rett syndrome in males.
• Improved characterization may lead to enhanced diagnostic approaches and the development of targeted therapeutic strategies for male patients.