Abstract
The degenerative muscle disorder facioscapulohumeral dystrophy (FSHD) is thought to be caused by the inappropriate expression of the Double Homeobox 4 (Dux4) protein in muscle cells leading to apoptosis. Expression of Dux4 in the major form of FSHD is a function of two contributing molecular changes: contractions in the D4Z4 microsatellite repeat region where Dux4 is located and an SNP present within a region downstream of the D4Z4. This SNP provides a functional, yet non-consensus polyadenylation signal (PAS) is used for the Dux4 mRNA 3′ end processing. Surprisingly, the sequences flanking the Dux4 PAS do not resemble a typical cleavage and polyadenylation landscape with no recognizable downstream sequence element and a suboptimal cleavage site. Here, we conducted a systematic analysis of the cis-acting elements that govern Dux4 cleavage and polyadenylation. Using a transcriptional read-through reporter, we determined that sequences downstream of the SNP located within the β-satellite region are critical for Dux4 cleavage and polyadenylation. We also demonstrate the feasibility of using antisense oligonucleotides to target these sequences as a means to reduce Dux4 expression. Our results underscore the complexity of the region immediately downstream of the D4Z4 and uncover a previously unknown function for the β-satellite region in Dux4 cleavage and polyadenylation.
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Acknowledgements
This work was supported by the Muscular Dystrophy Foundation (MDA 202141), Friends of FSH Research, and a Schissler Foundation Fellowship for Translational Studies of Common Human Diseases.
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NP performed the experiments and data analyses, and wrote the manuscript. EJW conceived the project and contributed to the design of the experiments, and manuscript writing.
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Peart, N., Wagner, E.J. A distal auxiliary element facilitates cleavage and polyadenylation of Dux4 mRNA in the pathogenic haplotype of FSHD. Hum Genet 136, 1291–1301 (2017). https://doi.org/10.1007/s00439-017-1813-8
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DOI: https://doi.org/10.1007/s00439-017-1813-8