title: Somatic mosaicism of chromosome 7 in a highly proliferating melanocytic congenital naevus in a ring chromosome 7 patient.
abstract: Ring chromosome 7 is a rare but well documented chromosomal aberration in man. So far at least 14 cases have been reported in the literature showing a variable but distinct pattern of phenotypic characteristics in affected individuals. Besides others, skin findings as pigmented naevi are especially frequent. Loss of chromosomal material from the terminal chromosome arms in the structurally abnormal ring chromosome 7 as well as somatic mosaicism with loss or gain of chromosome 7 has been suggested to be responsible for the clinical symptoms. We now report another case of a ring chromosome 7 in a 14-year-old boy with multiple remarkable congenital naevi, where we could demonstrate for the first time somatic mosaicism showing significant gain of chromosome 7 within a highly proliferating melanocytic congenital naevus (MCN).
authors.affiliation: Department of Human Genetics, Saarland University, University Hospital, Homburg/Saar, Germany. Yasmin.Mehraein@uniklinik-saarland.de
authors.forename: Yasmin
authors.initials: Y
authors.lastname: Mehraein
authors.forename: Sandra
authors.initials: S
authors.lastname: Ehlhardt
authors.forename: Arnold
authors.initials: A
authors.lastname: Wagner
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Göttert
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Tilgen
authors.forename: Klaus D
authors.initials: KD
authors.lastname: Zang
authors.forename: Dorothee
authors.initials: D
authors.lastname: Dill-Müller
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics; D000293:Adolescent; D002897:Chromosomes, Human, Pair 7; D020732:Cytogenetic Analysis; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D008214:Lymphocytes; D008297:Male; D009030:Mosaicism; D009508:Nevus, Pigmented / Q000151:congenital* / Q000235:genetics*; D012303:Ring Chromosomes