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Updated: Jun 20, 2026
An Electrochemiluminescence-Based Assay for MeCP2 Protein Variants
Published on: May 22, 2020
A common MECP2 haplotype associates with reduced cortical surface area in humans in two independent populations
Alexander H Joyner1, Cooper Roddey J, Cinnamon S Bloss
1Scripps Translational Science Institute, 3344 North Torrey Pines Court, La Jolla, CA 92037, USA.
Abstract:
The gene MECP2 is a well-known determinant of brain structure. Mutations in the MECP2 protein cause microencephalopathy and are associated with several neurodevelopmental disorders that affect both brain morphology and cognition. Although mutations in MECP2 result in severe neurological phenotypes, the effect of common variation in this genetic region is unknown. We find that common sequence variations in a region in and around MECP2 show association with structural brain size measures in 2 independent cohorts, a discovery sample from the Thematic Organized Psychosis research group, and a replication sample from the Alzheimer's Disease Neuroimaging Initiative. The most statistically significant replicated association (P < 0.025 in both cohorts) involved the minor allele of SNP rs2239464 with reduced cortical surface area, and the finding was specific to male gender in both populations. Variations in the MECP2 region were associated with cortical surface area but not cortical thickness. Secondary analysis showed that this allele was also associated with reduced surface area in specific cortical regions (cuneus, fusiform gyrus, pars triangularis) in both populations.
Insights
Common variations near the MECP2 gene are linked to brain size differences in males. Specifically, a common variant (rs2239464) is associated with reduced cortical surface area, impacting specific brain regions.
Area of Science:
- Neurogenetics
- Brain Imaging
- Human Genetics
Background:
- The Methyl CpG Binding Protein 2 (MECP2) gene is crucial for brain development and function.
- Mutations in MECP2 cause severe neurodevelopmental disorders, but the impact of common genetic variations is less understood.
Purpose of the Study:
- To investigate the association between common genetic variations in the MECP2 region and structural brain measures.
- To determine if common sequence variations influence brain morphology and cognition.
Main Methods:
- Analysis of common sequence variations in the MECP2 region using genetic data from two independent cohorts.
- Assessment of structural brain size measures, including cortical surface area and thickness, using neuroimaging data.
- Statistical analysis to identify significant associations, controlling for potential confounders.
Main Results:
- Common variations in the MECP2 region were significantly associated with structural brain size.
- The minor allele of SNP rs2239464 showed a replicated association with reduced cortical surface area (P < 0.025) in both cohorts.
- This association was specific to the male gender and affected specific cortical regions like the cuneus and fusiform gyrus.
Conclusions:
- Common genetic variations in the MECP2 region influence brain structure, particularly cortical surface area in males.
- The findings highlight the role of common genetic variation in shaping brain morphology beyond the effects of rare mutations.
- Further research is warranted to explore the functional consequences of these genetic associations on cognition and neurodevelopment.
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