title: A seventh locus for otosclerosis, OTSC7, maps to chromosome 6q13-16.1.
abstract: Otosclerosis is a common form of hearing impairment among white adults with a prevalence of 0.3-0.4%. It is caused by abnormal bone homeostasis of the otic capsule that compromises free motion of the stapes in the oval window. Otosclerosis is in most patients a multifactorial disease, caused by both genetic and environmental factors. In some cases, the disease is inherited as a monogenic autosomal dominant trait, sometimes with reduced penetrance. However, families large enough for genetic linkage studies are extremely rare. To date, five loci (OTSC1-5) have been reported, but none of the responsible genes have been cloned yet. An additional locus, OTSC6, has been reported to the HUGO nomenclature committee but the relevant linkage study has not been published. In this study, a genome-wide linkage study was performed in a large Greek pedigree segregating autosomal dominant otosclerosis. A seventh locus, OTSC7, was localized on chromosome 6q13-16.1 with a multipoint LOD score of 7.5 in the 13.47 cM region defined by markers D6S1036 (centromeric) and D6S300 (telomeric). Linkage analysis of this new locus in 13 smaller Belgian and Dutch families has identified one family from The Netherlands in which allele segregation suggests linkage to this region. The overlap between the critical regions of these two families is a 1.06 Mb interval between the genetic markers D6S1036 (centromeric) and D6S406 (telomeric) on chromosome 6q13.
authors.affiliation: Department of Medical Genetics, University of Antwerp, Universiteitsplein 1, Antwerp, Belgium.
authors.forename: Melissa
authors.initials: M
authors.lastname: Thys
authors.forename: Kris
authors.initials: K
authors.lastname: Van Den Bogaert
authors.forename: Vassiliki
authors.initials: V
authors.lastname: Iliadou
authors.forename: Kathleen
authors.initials: K
authors.lastname: Vanderstraeten
authors.forename: Nele
authors.initials: N
authors.lastname: Dieltjens
authors.forename: Isabelle
authors.initials: I
authors.lastname: Schrauwen
authors.forename: Wenjie
authors.initials: W
authors.lastname: Chen
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Eleftheriades
authors.forename: Maria
authors.initials: M
authors.lastname: Grigoriadou
authors.forename: Robert Jan
authors.initials: RJ
authors.lastname: Pauw
authors.forename: Cor R W J
authors.initials: CR
authors.lastname: Cremers
authors.forename: Richard J H
authors.initials: RJ
authors.lastname: Smith
authors.forename: Michael B
authors.initials: MB
authors.lastname: Petersen
authors.forename: Guy
authors.initials: G
authors.lastname: Van Camp
mesh_terms: D002874:Chromosome Mapping; D002896:Chromosomes, Human, Pair 6 / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D010040:Otosclerosis / Q000235:genetics*; D010375:Pedigree