Clinical and Molecular Characterisation of Orofaciodigital Syndromes and Other Clinical Phenotypes Secondary to Mutations in the OFD1 Gene

NCT01962129 | Unknown

• 1 other identifier: Thauvin PHRC N 2010
• Study Type: observational
• Target: 133
• Locations: 1 country
• Sites: 1

Brief Summary

The aim of this multicentre study will be to better describe the clinical characteristics and the etiological bases of patients with OFD syndrome by identifying new genes involved in OFD syndrome. These results will make it possible, from patients who have been clearly identified from a clinical, cytogenetic and molecular point of view, to determine a study strategy in such patients. The data obtained will be used to guide clinical geneticists in genetic counselling for patients and their families. Identification of the molecular bases of the different OFD syndromes will make it possible to determine whether or not they belong to the group of ciliopathies like type I OFD and to understand their physiopathological bases. This study will also make it possible to better characterise the phenotype of boys with syndromic mental retardation related to the OFD1 gene and thus to define the clinical criteria of the study of this gene in boys with mental retardation. The complete absence of knowledge concerning the genetic bases of OFD syndromes, apart from type I, the presence of a large collection of samples from patients with OFD syndrome at Dijon CHU, the recognition of the diagnostic laboratory for syndromic OFD at the international level as well as the technical platform and expertise in molecular cytogenetic methods including CGH-array and molecular genetics (sequencing, quantitative PCR, fragment analysis) at the Cytogenetics and Molecular Biology laboratories at Dijon CHU justify the implementation of such a study in 2010.

Conditions

Orofaciodigital Syndromes

Outcome Measures

Primary Outcomes (1)

• Blood Samples

  baselines

Study Arms (2)

Patients affected by a syndrome OFD

Biological: Sampling of blood

Patients AFFECTED BY A SEVERE MENTAL RETARDATION SYNDROMIQUE

Biological: Sampling of blood

Interventions

Sampling of blood BIOLOGICAL

Patients AFFECTED BY A SEVERE MENTAL RETARDATION SYNDROMIQUE; Patients affected by a syndrome OFD

Eligibility Criteria

• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)
• Sampling Method: Probability Sample

Study Population

Orofaciodigital Syndromes type I, type VII or other orofaciodigital syndromes

You may qualify if:

• Group 1: Study the molecular bases of OFD syndromes Patients from whom samples have been collected - declaration to the Ministry in progress Patients with an OFD syndrome with samples in the collection DC-2009-1045 and for which the declaration to the Ministry is in progress, will be included in this study. Indeed, the blood samples of 65 patients have been sent to us since 2002 for the study of the OFD l gene thanks to national and international recruitment: 35 presented clinical signs more or less associated with a mode of transmission suggesting OFD l syndrome and 30 presented other forms of OFD (OFDII, OFDVI, OFDVII, OFDVIII and OFDIX) or a polymalformative syndrome with OFD involvement (OFD+). We therefore constituted a second collection of DNA samples from 33 patients with OFD syndrome or a polymalformative syndrome with OFD involvement, who presented neither a mutation nor a rearrangement of the OFD1 gene.
• The clinical data are already available from Doctor Christel Thauvin-Robinet, who is responsible for this collection. These patients have signed a non-opposition form allowing the use of their blood samples for research on OFD syndromes. These patients will therefore be included in this new study without the need for new consent. Only an information letter will be sent to them (annexe 4A)
• Patients will be recruited by the clinical investigators of this study. These patients could be:
• patients already known by the investigator, who will contact the patient to invite them to take part in the research,
• Minors will only be included in our study if they are symptomatic. All of those who take part in this research, whether they are patients or healthy or asymptomatic relatives have to be covered by a national health insurance agency.
• Group 2: Study of the form of syndromic X-linked mental retardation secondary to mutations in the OFD1 gene Preexisting patient cohorts
• Two different types of populations could be included:
• Boys with Joubert syndrome with cerebellar hypoplasia at the origin of the "molar tooth" sign on cerebral MRI and a negative result for mutations in the genes involved in Joubert syndrome as described by Doctor Burglen (Hospital Trousseau, APHP)
• Boys with a phenotype that could be linked to mutations in the OFD1 gene:
• A cohort of boys with polydactyly+/- juvenile retinitis pigmentosa or obesity who were screened negative for BBS gene mutations recruited through Professor Dollfus (CHU Strasbourg)
• A cohort of males with severe macrocephaly (\>+4SD) with negative screening for mutations in the GPC3 gene recruited through Doctor Rossignol (CHU Trousseau, Paris) and Doctor Raynaud (CHU Tours).
• A cohort of males with recurrent pulmonary infections, macrocephaly (\>+4SD) and negative screening for mutations in the MECP2 gene recruited through Doctor Philippe (CHU Nancy), Doctor Badens (CHU Marseille), Professor Bieth (CHU Toulouse) and Professor Touraine (CHU St Etienne).
• The clinical dossier that accompanies each DNA sample will include a case report form, a family tree, photographs of the patient a signed written informed consent form
• Patients will be recruited by the clinical investigators of this study. These patients could be:
• patients already known by the investigator, who will contact the patient to invite them to take part in the research,

You may not qualify if:

• Patients will be excluded from the study if the clinical data do not meet the criteria defined above.
• Patients with OFD syndrome in whom sequencing of the exons or exon-intron junctions of the OFD1 gene of genomic DNA and the search for major rearrangements quantitative PCR identify a causal mutation will not be included in this study.
• The following patients will also be excluded from the study:
• those who do not wish to provide a blood sample,
• those who have not provided written informed consent,
• those without national health insurance,
• those in custody following a legal or administrative decision.

Sponsors & Collaborators

• Centre Hospitalier Universitaire Dijon: lead

Study Sites (1)

CHU Dijon

Dijon, 21000, France

RECRUITING

MeSH Terms

Conditions

Orofaciodigital Syndromes

Condition Hierarchy (Ancestors)

Dysostoses; Bone Diseases, Developmental; Bone Diseases; Musculoskeletal Diseases; Craniofacial Abnormalities; Musculoskeletal Abnormalities; Abnormalities, Multiple; Congenital Abnormalities; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Sex Chromosome Disorders; Chromosome Disorders; Genetic Diseases, Inborn

Central Study Contacts

Christel Thauvin

CONTACT

03.80.29.53.13; christel.thauvin@chu-dijon.fr

Study Design

• Study Type: observational
• Observational Model: CASE ONLY
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: October 8, 2013
• First Posted: October 14, 2013
• Study Start: June 1, 2011
• Primary Completion: June 1, 2014
• Last Updated: October 14, 2013

Record last verified: 2013-10

Locations

FR (1)