title: Phenotype of a Belgian Family With 6p25 Deletion Syndrome.
abstract: BACKGROUND
  The 6p25 deletion syndrome is one of the many syndromes with both hearing impairment as well as vision impairment. However, the audiometric characteristics and radiological findings of patients with 6p25 deletions are only scarcely described in literature. This study focused on characterizing the audiometric and radiological features of a Belgian family with a chromosome 6p25 deletion.
  
  
  OBJECTIVE
  To evaluate the hearing impairment, audiometric testing and radiological examination of the temporal bones in 3 family members with a 3.4 Mb deletion in chromosome band 6p25.
  
  
  RESULTS
  All 3 family members demonstrated slowly progressive sensorineural or mixed hearing impairment. Radiologic examination revealed thickened and sclerotic stapes in all patients and a minor internal partition type II of the cochlea in 2 patients.
  
  
  CONCLUSIONS
  There is a significant phenotypic variability within and among families with the 6p25 deletion syndrome. A thorough genotype-phenotype correlation is difficult because of the small number of affected patients and the limited clinical data available. More clinical data of families with 6p25 deletions need to be published in order to create a reliable and precise phenotypic characterization. However, our findings can facilitate counseling of hearing impairment caused by 6p25 deletions.
authors.affiliation: Department of Otorhinolaryngology, Ghent University Hospital, Ghent, Belgium nicoleweegerink@hotmail.com.
authors.forename: Nicole J D
authors.initials: NJ
authors.lastname: Weegerink
authors.affiliation: Department of Otorhinolaryngology, Ghent University Hospital, Ghent, Belgium.
authors.forename: Freya K R
authors.initials: FK
authors.lastname: Swinnen
authors.affiliation: Department of Medical Genetics, Ghent University Hospital, Ghent, Belgium.
authors.forename: Olivier M
authors.initials: OM
authors.lastname: Vanakker
authors.affiliation: Department of Medical Imaging, Sint-Jan Hospital, Bruges, Belgium.
authors.forename: Jan W
authors.initials: JW
authors.lastname: Casselman
authors.affiliation: Department of Otorhinolaryngology, Ghent University Hospital, Ghent, Belgium.
authors.forename: Ingeborg J M
authors.initials: IJ
authors.lastname: Dhooge
mesh_terms: D000328:Adult; D000869:Anterior Eye Segment / Q000002:abnormalities; D001530:Belgium; D002872:Chromosome Deletion; D002896:Chromosomes, Human, Pair 6; D015834:Cochlear Diseases / Q000000981:diagnostic imaging; D002658:Developmental Disabilities / Q000235:genetics; D018450:Disease Progression; D005260:Female; D051858:Forkhead Transcription Factors / Q000235:genetics; D005901:Glaucoma / Q000235:genetics; D046089:Hearing Loss, Mixed Conductive-Sensorineural / Q000235:genetics*; D006319:Hearing Loss, Sensorineural / Q000235:genetics*; D006801:Humans; D008297:Male; D063371:Myringosclerosis / Q000000981:diagnostic imaging / Q000235:genetics; D010641:Phenotype; D012598:Sclerosis / Q000000981:diagnostic imaging; D013199:Stapes / Q000000981:diagnostic imaging / Q000473:pathology; D066127:White Matter / Q000002:abnormalities / Q000000981:diagnostic imaging
chemical_list: C112743:FOXC1 protein, human; D051858:Forkhead Transcription Factors
keywords: 6p25 deletion syndrome; FOXC1; hearing impairment; radiological characteristics