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Updated: Sep 10, 2025

An Electrochemiluminescence-Based Assay for MeCP2 Protein Variants

An Electrochemiluminescence-Based Assay for MeCP2 Protein Variants

Published on: May 22, 2020

Rett Syndrome: Specific MECP2 Variants are Associated With Elevated Serum Neurofilament Light Chain.

Emma Hirn¹, Brenda Huppke¹, Bernd Wilken²

¹Department of Neuropediatrics, Jena University Hospital, Jena, Germany.

Pediatric Neurology

|August 22, 2025

Summary

Serum neurofilament light chain (sNfL) levels are elevated in some Rett syndrome patients, indicating neuronal damage. This elevation is linked to specific severe MECP2 variants, suggesting sNfL as a biomarker for future therapies.

Keywords:

MECP2 Methyl CpG binding protein 2 variants Rett syndrome Serum neurofilament light chains

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Published on: December 1, 2017

Area of Science:

Neuroscience
Genetics
Biomarker Research

Background:

Rett syndrome is a neurodevelopmental disorder in females caused by MECP2 variants.
Clinical decline in Rett syndrome suggests neuronal damage, but pathology studies have not confirmed neurodegeneration.
Serum neurofilament light chain (sNfL) is a sensitive biomarker for neuronal damage.

Purpose of the Study:

To investigate neurodegeneration in Rett syndrome by measuring sNfL levels.
To correlate sNfL levels with MECP2 variant type and clinical severity.

Main Methods:

Cross-sectional study of 77 females with confirmed pathogenic MECP2 variants.
sNfL levels measured via single-molecule array assay.
sNfL levels converted to age-adjusted z-scores and compared with variant type and clinical data.

Main Results:

Rett syndrome cohort showed significantly higher sNfL z-scores than healthy controls (P < 0.001).
Elevated sNfL z-scores were specifically associated with pathogenic variants in the nuclear receptor corepressor interaction domain (P < 0.001).
Patients with severe motor and hand function impairment had higher sNfL levels (P = 0.04).

Conclusions:

sNfL levels indicate ongoing neuronal damage in a subset of Rett syndrome patients.
Elevated sNfL is primarily linked to severe pathogenic MECP2 variants affecting a specific domain.
sNfL shows potential as a biomarker for monitoring disease progression and therapeutic efficacy in Rett syndrome.