Identification of Large-Scale Mutations of POLG Gene by QMPSF in Patients With Mitochondrial DNA Instability.

• Conditions: Diagnosis; Mitochondrial Diseases; DNA Mutations
• Interventions: Genetic: mitochondrial DNA mutations diagnosis

• Registration Number: NCT00831948
• Lead Sponsor: Centre Hospitalier Universitaire de Nice

Brief Summary

Mitochondrial diseases are a heterogeneous group caused by genetic defects in mitochondrial DNA or in nuclear genes. POLG is the most frequently involved gene in mtDNA instability diseases resulting in mtDNA multiple deletion and/or depletion. It encodes the DNA polymerase gamma (POLγ), the only known DNA polymerase found in mammalian mitochondria. Mutations in POLG could explain 45% of familial progressive external ophtalmoplegia associated with multiple mtDNA deletions. However, in more than 70%, the analysis of the genes involved in mtDNA instability remains unsuccessful.

To date, these genes are screened by sequencing methods that are not able to detect large-scale rearrangements. In order to detect possible large-scale rearrangements, the investigators propose to develop a new assay based on QMPSF (Quantitative Multiplex PCR of Short fluorescent Fragments) able to detect exon deletions and duplications. the investigators propose to screen the POLG gene by QMPSF in at least twenty patients with either no mutation or only one mutation detected in POLG and no mutation in other genes such as TWINKLE and ANT1.

This study would allow the investigators to know if large-scale rearrangements occur in the POLG gene and to estimate their frequency in patients with mtDNA instability. These data are important to know if the sequencing analysis of POLG should be completed by the screening for partial deletions and duplications to ensure an accurate molecular diagnosis of these syndromes. Moreover, this method could be extended to ANT1 and TWINKLE genes.

Detailed Description

Not available

Study Timeline

• Study Start: 2008-12
• Status Verified: 2009-01
• Study First Submitted: 2009-01-28
• Study First Submitted QC: 2009-01-28
• Last Update Submitted: 2009-01-28
• Study First Posted: 2009-01-29
• Last Update Posted: 2009-01-29

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 20

Inclusion Criteria

• Patients already diagnosed for mitochondrial pathology without mtDNA mutations yet detected by current diagnostic techniques

Exclusion Criteria

Not provided

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Mitochondrial disease	mitochondrial DNA mutations diagnosis	Patients already diagnosed for mitochondrial pathology without mtDNA mutations yet detected by current diagnostic techniques

Primary Outcome Measures

Name	Time	Method
Improving the diagnosis of mitochondrial pathology	1 day

Trial Locations

Locations (1)

Centre Hospitalier Universitaire de Nice- Hôpital ARCHET 2 -Laboratoire de Génétique Médicale; 🇫🇷 Nice, France