Subtelomeric deletions of chromosome 6p: Molecular and cytogenetic characterization of three new cases with phenotypic overlap with Ritscher?Schinzel (3C) syndrome
| Autor: | Albert E. Chudley, Ian D. Krantz, Nora Wasserman, Albert Schinzel, Lynn Bason, Agnès Guichet, Annick Toutain, Lori Schneider, Ammini Menon, Ryan Geschwindt, Jorge M. Saraiva, Cheryl DeScipio, Terri L. Young, Patricia G. Wheeler, Fengmin Lu, Marc S. Williams, William E. Dobyns, Lori Jukofsky, Dinah Yaeger, Nancy B. Spinner |
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| Rok vydání: | 2005 |
| Předmět: |
Heart Defects
Congenital Male congenital hereditary and neonatal diseases and abnormalities Pathology medicine.medical_specialty Biology Translocation Genetic Craniofacial Abnormalities Diagnosis Differential Fatal Outcome Ptosis Cerebellum Genetics medicine Humans Abnormalities Multiple Hypertelorism Craniofacial Child Fetal Death In Situ Hybridization Fluorescence Genetics (clinical) Family Health Cytogenetics Macrocephaly Occiput Syndrome Telomere medicine.disease Chromosome Banding Phenotype Palpebral fissure medicine.anatomical_structure 3C syndrome Child Preschool Karyotyping Chromosomes Human Pair 6 Female Chromosome Deletion medicine.symptom Chromosomes Human Pair 16 |
| Zdroj: | American Journal of Medical Genetics Part A. :3-11 |
| ISSN: | 1552-4833 1552-4825 |
| Popis: | We have identified six children in three families with subtelomeric deletions of 6p25 and a recognizable phenotype consisting of ptosis, posterior embryotoxon, optic nerve abnormalities, mild glaucoma, Dandy-Walker malformation, hydrocephalus, atrial septal defect, patent ductus arteriosus, and mild mental retardation. There is considerable clinical overlap between these children and individuals with the Ritscher-Schinzel (or cranio-cerebello-cardiac (3C)) syndrome (OMIM #220210). Clinical features of 3C syndrome include craniofacial anomalies (macrocephaly, prominent forehead and occiput, foramina parietalia, hypertelorism, down-slanting palpebral fissures, ocular colobomas, depressed nasal bridge, narrow or cleft palate, and low-set ears), cerebellar malformations (variable manifestations of a Dandy-Walker malformation with moderate mental retardation), and cardiac defects (primarily septal defects). Since the original report, over 25 patients with 3C syndrome have been reported. Recessive inheritance has been postulated based on recurrence in siblings born to unaffected parents and parental consanguinity in two familial cases. Molecular and cytogenetic mapping of the 6p deletions in these three families with subtelomeric deletions of chromosome 6p have defined a 1.3 Mb minimally deleted critical region. To determine if 6p deletions are common in 3C syndrome, we analyzed seven unrelated individuals with 3C syndrome for deletions of this region. Three forkhead genes (FOXF1 and FOXQ1 from within the critical region, and FOXC1 proximal to this region) were evaluated as potential candidate disease genes for this disorder. No deletions or disease-causing mutations were identified. |
| Databáze: | OpenAIRE |
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