title: Two supernumerary marker chromosomes, derived from chromosome 6 and 9, in a boy with mild developmental delay.
abstract: We report on a boy with two supernumerary marker chromosomes which were identified by fluorescence in situ hybridization and derived from chromosome 6 and 9. In lymphocytes, a mosaic karyotype was found: 46,XY (17%)/ 47,XY,r(6) (24%)/47,XY,r(9) (20%)/48,XY,r(6),r(9) (39%). Only minor dysmorphic features and mild developmental delay were present. Despite extensive fluorescence in situ hybridization studies using a large panel of probes, we were unable to characterize the marker chromosomes in more detail, mainly because no probes for the chromosome regions involved were available to us. In order to reach a better understanding of the clinical relevance of small supernumerary marker chromosomes, it will be necessary to create a widely available set of probes, covering all chromosome regions.
authors.affiliation: Institute of Human Genetics, Academic Medical Center, Amsterdam, The Netherlands.
authors.forename: C M
authors.initials: CM
authors.lastname: Aalfs
authors.forename: M E
authors.initials: ME
authors.lastname: Jacobs
authors.forename: M A
authors.initials: MA
authors.lastname: Nieste-Otter
authors.forename: R C
authors.initials: RC
authors.lastname: Hennekam
authors.forename: J M
authors.initials: JM
authors.lastname: Hoovers
mesh_terms: D002675:Child, Preschool; D002896:Chromosomes, Human, Pair 6; D002899:Chromosomes, Human, Pair 9; D002658:Developmental Disabilities / Q000235:genetics*; D005145:Face / Q000002:abnormalities; D005819:Genetic Markers; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D008297:Male; D011596:Psychomotor Disorders / Q000235:genetics
chemical_list: D005819:Genetic Markers