Ignite Creation Date:
2025-12-25 @ 12:32 AM
Ignite Modification Date:
2025-12-25 @ 10:39 PM
Study NCT ID:
NCT06079567
Status:
RECRUITING
Last Update Posted:
2024-10-09
First Post:
2023-10-06
Is NOT Gene Therapy:
False
Has Adverse Events:
False
Brief Title:
An 18-month Prospective Natural History Study to Gain Insight Into FSHD2 Pathophysiology and Disease Progression
Sponsor:
Centre Hospitalier Universitaire de Nice
Organization:
Study Overview
Official Title:
An 18-month Prospective Natural History Study to Gain Insight Into FSHD2 Pathophysiology and Disease Progression
Status:
RECRUITING
Status Verified Date:
2024-10
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
INSIGHT FSHD2
Brief Summary:
Facioscapulohumeral muscular dystrophy (FSHD) is one of the most common inherited myopathies in adults. It is associated with genetic and epigenetic deregulation of the D4Z4 locus on the sub-telomeric region of chromosome 4q35, resulting in abnormal expression of DUX4p. Type 1 FSHD (FSHD1) is the most common form of the disease and accounts for 95% of cases, while Type 2 FSHD (FSHD2) accounts for only 5% of all FSHD cases. FSHD1 and FSHD2 are closely related in terms of genetic and epigenetic foundations, pathophysiology and clinical manifestations. Although initially described as distinct entities based on their genetics, recent information suggests that both forms of myopathy may represent the opposite ends of a spectrum of molecular diseases in which alteration of the genetic and epigenetic factors that govern DUX4 suppression in skeletal muscle have a different impact in both forms of the disease. FSHD1 and FSHD2 are both associated with re-expression of DUX4 leading to muscle atrophy, but the genetics underlying this re-expression are different, depending on whether it is type 1 or type 2. For FSHD1, it is associated with a critical contraction of the D4Z4 region and the 4qA permissive allele, leading to the expression of DUX4. In contrast, FSHD2 is caused by the inheritance of two independent genetic variations. A heterozygous mutation, mainly located on the SMCHD1 (Structural Maintenance of Chromosome flexible Hinge Domain containing 1) gene, results in a loss of function of chromatin D4Z4 repressor. This mutation, combined with the 4qA allele bearing the DU4 polyadenylation site, makes this allele permissive for the expression of the DUX4 topical gene.
Therefore, because the two forms of FSHD are genetically distinct and very few patients have FSHD2, our knowledge of the impact of chromatin D4Z4 repressors, such as SMCHD1, or the progression and severity of the disease remains very limited. It is important to note that a lack of reliable biomarkers specific to the severity and progression of the disease may prevent the development of therapies to treat patients with FSHD2. This study will allow us to better understand the natural progression of FSHD2 over time, to assess the responsiveness of clinical outcome measures (COMs) and to identify and validate inflammatory serum biomarkers predicting the severity and progression of the disease.
Therefore, because the two forms of FSHD are genetically distinct and very few patients have FSHD2, our knowledge of the impact of chromatin D4Z4 repressors, such as SMCHD1, or the progression and severity of the disease remains very limited. It is important to note that a lack of reliable biomarkers specific to the severity and progression of the disease may prevent the development of therapies to treat patients with FSHD2. This study will allow us to better understand the natural progression of FSHD2 over time, to assess the responsiveness of clinical outcome measures (COMs) and to identify and validate inflammatory serum biomarkers predicting the severity and progression of the disease.
Detailed Description:
None
Study Oversight
Has Oversight DMC:
False
Is a FDA Regulated Drug?:
False
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
False
Is an FDA AA801 Violation?: