PAX7 target genes are globally repressed in facioscapulohumeral muscular dystrophy skeletal muscle.

PAX7 target genes are globally repressed in facioscapulohumeral muscular dystrophy skeletal muscle.
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DOI:
10.1038/s41467-017-01200-4
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发表时间:
2017-12-18
影响因子:
16.6
通讯作者:
Zammit PS
Zammit PS
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Banerji CRS;Panamarova M;Hebaishi H;White RB;Relaix F;Severini S;Zammit PS

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面肩肱型肌营养不良症 (FSHD) 是一种普遍存在的无法治愈的肌病,与 4q 染色体上 D4Z4 重复序列的低甲基化导致 DUX4 转录因子的表达有关。然而,DUX4 很难在 FSHD 肌肉活检中检测到,并且 DUX4 靶基因表达的变化作为 FSHD 生物标志物的稳健程度存在争议。 PAX7 是肌生成的主要调节因子,可挽救 DUX4 介导的细胞凋亡。在这里,我们表明 PAX7 靶基因的抑制是 FSHD 的一个标志,并且它与 DUX4 靶基因表达一样是 FSHD 肌肉的主要特征。这是通过对六项以上 FSHD 肌肉活检基因表达研究的荟萃分析得出的结果,并通过对 FSHD 患者来源的成肌细胞进行 RNA 测序进行验证。 DUX4 还抑制 PAX7 激活其转录靶基因,反之亦然。此外,PAX7 靶基因抑制可以解释 FSHD 的氧化应激敏感性和表观遗传变化。因此,PAX7 靶基因抑制是 FSHD 的一个标志,在 FSHD 病理学和治疗研究中应予以考虑。面肩肱型肌营养不良症是一种与 DUX4 转录因子异位表达相关的肌病。作者表明,肌生成调节因子 PAX7 靶基因的抑制是 FSHD 的一个特征,并且可能解释氧化应激敏感性和表观遗传变化。
Facioscapulohumeral muscular dystrophy (FSHD) is a prevalent, incurable myopathy, linked to hypomethylation of D4Z4 repeats on chromosome 4q causing expression of the DUX4 transcription factor. However, DUX4 is difficult to detect in FSHD muscle biopsies and it is debatable how robust changes in DUX4 target gene expression are as an FSHD biomarker. PAX7 is a master regulator of myogenesis that rescues DUX4-mediated apoptosis. Here, we show that suppression of PAX7 target genes is a hallmark of FSHD, and that it is as major a signature of FSHD muscle as DUX4 target gene expression. This is shown using meta-analysis of over six FSHD muscle biopsy gene expression studies, and validated by RNA-sequencing on FSHD patient-derived myoblasts. DUX4 also inhibits PAX7 from activating its transcriptional target genes and vice versa. Furthermore, PAX7 target gene repression can explain oxidative stress sensitivity and epigenetic changes in FSHD. Thus, PAX7 target gene repression is a hallmark of FSHD that should be considered in the investigation of FSHD pathology and therapy. Facioscapulohumeral muscular dystrophy is a myopathy linked to ectopic expression of the DUX4 transcription factor. The authors show that the suppression of targets genes of the myogenesis regulator PAX7 is a signature of FSHD, and might explain oxidative stress sensitivity and epigenetic changes.
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