NCIt definition : An autosomal dominant form of facioscapulohumeral muscular dystrophy associated with
contraction of the D4Z4 macrosatellite repeat.;
NCIt note : Facioscapulohumeral muscular dystrophy 1 (FSHD1) is associated with contraction of
the D4Z4 macrosatellite repeat in the subtelomeric region of chromosome 4q35. The
D4Z4 repeat region normally contains between 11 and more than 100 repeated segments,
which includes one functional protein-encoding gene DUX4, encoding ouble homeobox
protein 4, and multiple copies that are not transcribed, which are designated DUX4-like
or DUX4l genes. The D4Z4 repeat array of FSHD1 patients contains less than 11 repeats.
(OMIM and MedlinePlus);