MeCP2 MBD-ID module: a unified DNA/RNA binding interface disrupted in Rett syndrome.

The MeCP2 MBD-ID module binds DNA and RNA with high affinity, and mutations linked to Rett syndrome weaken RNA and non-methylated DNA interactions, disrupting nucleic acid competition.

• Why it matters: Understanding how MeCP2 interacts with DNA and RNA is crucial because mutations in this region cause Rett syndrome, yet the molecular mechanisms remain unclear, especially regarding nucleic acid binding dynamics.
• What they did: The study examined the MBD and ID domains together using binding assays, revealing their synergistic function and the impact of Rett-associated mutations on nucleic acid interactions, particularly RNA and non-methylated DNA.
• The result: Findings show the MBD-ID module as a key nucleic acid interaction hub, and mutations impairing RNA and non-methylated DNA binding may underlie Rett syndrome pathology, offering insights into potential therapeutic targets.