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Facioscapulohumeral muscular dystrophy.

¹Department of Neurology, University of Rochester Medical Center, Rochester, NY, United States.

Handbook of Clinical Neurology

|February 27, 2018

Summary

This summary is machine-generated.

Facioscapulohumeral muscular dystrophy (FSHD) is caused by DUX4 gene activation. Recent findings link D4Z4 repeat contraction or SMCHD1 mutations to this aberrant gene expression, offering new therapeutic targets for FSHD.

Keywords:

DNA methylation DUX4 FSH dystrophy FSHD SMCHD1 facioscapulohumeral muscular dystrophy

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Area of Science:

Genetics
Molecular Biology
Neurology

Background:

Facioscapulohumeral muscular dystrophy (FSHD) is a common neuromuscular disorder characterized by progressive muscle weakness.
The genetic basis of FSHD involves the D4Z4 macrosatellite repeat on chromosome 4q35, but the exact mechanism remained unclear for years.
DUX4, a gene typically expressed only in the germline, has been identified as a key player in FSHD pathogenesis.

Purpose of the Study:

To elucidate the molecular mechanisms underlying Facioscapulohumeral muscular dystrophy (FSHD).
To investigate the role of D4Z4 repeat contraction and SMCHD1 mutations in DUX4 gene activation.
To identify the root cause of FSHD for targeted therapeutic development.

Main Methods:

Analysis of D4Z4 repeat numbers and chromatin structure in FSHD patients.
Investigation of SMCHD1 gene mutations in FSHD cases without D4Z4 contraction.
Assessment of DUX4 gene expression in relation to chromatin changes.

Main Results:

Contraction of D4Z4 repeats leads to chromatin relaxation and DUX4 de-repression.
In FSHD2, mutations in SMCHD1 cause similar chromatin changes and DUX4 activation.
Aberrant DUX4 transcription is identified as the primary cause of FSHD.

Conclusions:

The inappropriate activation of DUX4 transcription is the central mechanism driving Facioscapulohumeral muscular dystrophy (FSHD).
Understanding the genetic causes, including D4Z4 repeat changes and SMCHD1 mutations, provides a foundation for developing targeted therapies.
This research opens avenues for novel therapeutic strategies aimed at repressing DUX4 expression in FSHD patients.