An observational study in Fraser Syndrome, Fryns Syndrome and Chromosomal Abnormalities, sponsored by National Human Genome Research Institute (NHGRI). Completed at 1 site in United States. Per ClinicalTrials.gov, last updated 2008-03-04.
Sponsored by National Human Genome Research Institute (NHGRI) · Observational
This study will examine blood or other tissue samples from patients with Fraser syndrome and patients with Fryns syndrome to try to identify the gene responsible for these diseases. Fraser syndrome is characterized by congenital abnormalities including cryptophthalmos (lack of eyelid formation), syndactyly (webbed fingers or toes) and abnormal genitalia. Patients may also have abnormalities of the nose, ears and larynx (voice box), cleft lip or palate, and kidney agenesis. Fryns syndrome is characterized by hernia through the diaphragm, cloudy cornea, coarse facial features, cleft lip or palate, abnormal fingers and toes, heart, kidney and brain malformations and hydrocephalus (accumulation of fluid around the brain). This protocol consists of laboratory study only; it does not involve patient care or patient counseling.
Patients with Fraser syndrome or Fryns syndrome are eligible for this study. Parents and healthy siblings of patients will also be included for genetic study, and parents of children with undiagnosed multiple congenital anomalies syndromes will be included for comparison study.
Participants will provide a blood sample (about 8 to 10 teaspoons from adults; 1 to 3 teaspoons from children) or sample of skin cells collected by swabbing the inner surface of the cheek. Some patients may undergo a skin biopsy, in which a small skin sample (about 1/8-inch in diameter) is surgically removed. The tissue samples will be used to obtain DNA (genetic material) for laboratory testing. A permanent cell line-a collection of cells grown in the laboratory from the original tissue specimen-will also be established to enable additional testing in the future.
We would like to determine the molecular genetic etiology of two rare human malformation syndromes, Fraser syndrome (OMIM 219000) and Fryns syndrome (OMIM 229850). To date, we are unaware of molecular genetic studies that have been performed in either syndrome.
We are planning to perform molecular genetic studies on DNA specimens from affected individuals ascertained outside NIH by other clinicians and/or reported in the medical literature. Should these studies prove fruitful, we would plan to expand this work to a combined clinical and molecular study to fully delineate the phenotypes associated with these disorders.
We plan to collect DNA specimens from affected patients and from unaffected siblings and parents and to evaluate the specimens in the laboratory by linkage analysis, physical mapping, candidate gene characterization and mutation screening. If the causative genes(s) for either syndrome are identified, then mouse models of the diseases may be developed and cell biologic studies of normal and mutant proteins may be undertaken.
The cloning of these genes would enable better characterization of human developmental processes and improve patient counseling for individuals and families affected by these diseases.
48 studies on the registry are indexed under Chromosome Aberrations; 10 are open to participants now.
This study's enrollment of 400 is above the median of 231 across 30 observational studies indexed under Chromosome Aberrations.
Browse Chromosome Aberrations studies →National Human Genome Research Institute (NHGRI) is the lead sponsor of 203 studies on the registry; 33 are open to participants now.
Counted across the registry records on this site, refreshed daily.
INCLUSION CRITERIA:
For Fraser syndrome, clinical criteria for inclusion will be by:
Satisfying diagnostic criteria for Fraser syndrome. These are at least two major criteria and one minor criterion (listed below) or one major criterion and four minor criteria.
Major criteria:
Cryptophthalmos
Syndactyly
Abnormal genitalia
Sib with cryptophthalmos syndrome
Minor criteria:
Congenital malformation of the nose
Congenital malformations of the ears
Congenital malformation of the larynx
Cleft lip and/or palate
Skeletal defects
Umbilical hernia
Renal agenesis
Mental retardation
Cryptophthalmos with additional anomalies consistent with the phenotypic spectrum of Fraser syndrome but without satisfying diagnotisic for Fraser syndrome may also be considered sufficient for inclusion.
For Fryns syndrome, formal diagnostic criteria have not been published. The clinical criteria for inclusion will be:
Diaphragmatic hernia with at least one additional anomaly found in the spectrum of Fryns syndrome, including cleft lip and or palate, renal or genital malformations, cerebral malformations or hydrocephalus, corneal clouding, craniofacial dysmorphism and brachydactyly or nail hypoplasia, pulmonary agenesis or microphthalmia.
Patients with four or more of the additional anomalies may be included in the study.
Parents and unaffected siblings will be also included for linkage analysis.
Specimens of DNA or whole blood for DNA extraction collected outside the NIH may be accepted into the study if they are obtained through an approved NIH protocol consent form.
This study is completed, as verified in Feb 2003. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
National Human Genome Research Institute (NHGRI) →