title: Further delineation of 9q22 deletion syndrome associated with basal cell nevus (Gorlin) syndrome: report of two cases and review of the literature.
abstract: Basal cell nevus syndrome (BCNS; Gorlin syndrome) is an autosomal dominant disorder, characterized by a predisposition to neoplasms and developmental abnormalities. BCNS is caused by mutations in the human homolog of the Drosophila patched gene-1, PTCH1, which is mapped on chromosome 9q22.3. Nonsense, frameshift, in-frame deletions, splice-site, and missense mutations have been found in the syndrome. Haploinsufficiency of PTCH1, which is caused by interstitial deletion of 9q22.3, is also responsible for the syndrome. To date, 19 cases with interstitial deletion of long arm of chromosome 9 involving the region of q22 have been reported. We describe two unrelated patients with some typical features of BCNS associated with deletion of 9q21.33-q31.1 and determined the boundary of the deletion by fluorescence in situ hybridization (FISH) with bacterial artificial chromosome (BAC) clones. The results showed that the size of deletions is between 15.33 and 16.04 Mb in patient 1 and between 18.08 and 18.54 Mb in patient 2. Although the size and breakpoints were different from those of previously reported cases, the clinical features are common to patients with 9q22 deletion associated with BCNS. Delineation of the 9q22 deletions and further consideration of the genes responsible for the characteristic manifestations may provide insight into this newly recognized deletion syndrome.
authors.affiliation: Department of Genetic Counseling, Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan.
authors.forename: Kayono
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yoshihashi
authors.forename: Noritaka
authors.initials: N
authors.lastname: Furuya
authors.forename: Masanori
authors.initials: M
authors.lastname: Adachi
authors.forename: Susumu
authors.initials: S
authors.lastname: Ito
authors.forename: Yukichi
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Masuno
authors.forename: Hideaki
authors.initials: H
authors.lastname: Chiyo
authors.forename: Kenji
authors.initials: K
authors.lastname: Kurosawa
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics; D000328:Adult; D001478:Basal Cell Nevus Syndrome / Q000235:genetics* / Q000473:pathology; D002872:Chromosome Deletion; D002874:Chromosome Mapping; D022202:Chromosomes, Artificial, Bacterial; D002899:Chromosomes, Human, Pair 9 / Q000235:genetics*; D002658:Developmental Disabilities / Q000235:genetics; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007231:Infant, Newborn; D008607:Intellectual Disability / Q000235:genetics; D007621:Karyotyping; D008297:Male; D013577:Syndrome; D014057:Tomography, X-Ray Computed