MECP2 duplication syndrome in both genders

Area of Science:

• Genetics
• Neurology
• Molecular Biology

Background:

• MECP2 gene duplications at Xq28 cause a distinct syndrome in males, differing from Rett syndrome.
• MECP2 duplication syndrome presents with severe intellectual disability, recurrent infections, and epilepsy.

Purpose of the Study:

• Investigate genomic copy number in patients with unexplained intellectual disability.
• Analyze phenotypic features associated with MECP2 gene duplications.

Main Methods:

• Genomic copy number analysis was performed on patients with unexplained intellectual disability.
• Phenotypic features of patients with interstitial MECP2 duplications were analyzed.
• X-chromosome inactivation patterns were assessed in female patients.

Main Results:

• Four patients (three male, one female) with MECP2 duplications were identified, exhibiting MECP2 duplication syndrome features.
• The female patient showed skewed X-chromosome inactivation favoring the duplicated MECP2 allele.
• Her mother, a non-symptomatic carrier with a random XCI pattern, also had the MECP2 duplication.
• Periventricular cystic lesions were observed via brain MRI in all four patients.

Conclusions:

• MECP2 duplication syndrome has clinical implications for both male and female patients with unexplained intellectual disability.
• The findings expand the understanding of MECP2 duplication syndrome's presentation and inheritance patterns.