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Dysregulation of 4q35- and muscle-specific genes in fetuses with a short D4Z4 array linked to facio-scapulo-humeral dystrophy.

Abstract：

:Facio-scapulo-humeral dystrophy (FSHD) results from deletions in the subtelomeric macrosatellite D4Z4 array on the 4q35 region. Upregulation of the DUX4 retrogene from the last D4Z4 repeated unit is thought to underlie FSHD pathophysiology. However, no one knows what triggers muscle defect and when alteration arises. To gain further insights into the molecular mechanisms of the disease, we evaluated at the molecular level, the perturbation linked to the FSHD genotype with no a priori on disease onset, severity or penetrance and prior to any infiltration by fibrotic or adipose tissue in biopsies from fetuses carrying a short pathogenic D4Z4 array (n = 6) compared with fetuses with a non-pathogenic D4Z4 array (n = 21). By measuring expression of several muscle-specific markers and 4q35 genes including the DUX4 retrogene by an RT-PCR and western blotting, we observed a global dysregulation of genes involved in myogenesis including MYOD1 in samples with <11 D4Z4. The DUX4-fl pathogenic transcript was detected in FSHD biopsies but also in controls. Importantly, in FSHD fetuses, we mainly detected the non-spliced DUX4-fl isoform. In addition, several other genes clustered at the 4q35 locus are upregulated in FSHD fetuses. Our study is the first to examine fetuses carrying an FSHD-linked genotype and reveals an extensive dysregulation of several muscle-specific and 4q35 genes at early development stage at a distance from any muscle defect. Overall, our work suggests that even if FSHD is an adult-onset muscular dystrophy, the disease might also involve early molecular defects arising during myogenesis or early differentiation.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Broucqsault N,Morere J,Gaillard MC,Dumonceaux J,Torrents J,Salort-Campana E,Maues De Paula A,Bartoli M,Fernandez C,Chesnais AL,Ferreboeuf M,Sarda L,Dufour H,Desnuelle C,Attarian S,Levy N,Nguyen K,Magdinier F,Roche S

doi

10.1093/hmg/ddt272

subject

Has Abstract

pub_date

2013-10-15 00:00:00

pages

4206-14

issue

eissn

0964-6906

issn

1460-2083

pii

ddt272

journal_volume

pub_type

杂志文章

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Dysregulation of 4q35- and muscle-specific genes in fetuses with a short D4Z4 array linked to facio-scapulo-humeral dystrophy.