title: Identification of supernumerary marker chromosomes derived from chromosomes 5, 6, 19, and 20 using FISH.
abstract: A large number of cases with supernumerary marker chromosomes (SMCs) should be compared to achieve a better delineation of karyotype-phenotype correlations. Here we present four phenotypically abnormal patients with autosomal marker chromosomes analysed by fluorescence in situ hybridisation using centromeric, telomeric, and unique sequence probes, as well as forward and reverse painting. We also report the first case, to the best of our knowledge, of an SMC derived from chromosome 5. Furthermore, a marker chromosome 20 in a patient with sex differentiation abnormalities, a double mar(6) in a boy with psychomotor retardation, and the association of r(19) with dup(21q21.2q22.12) are described. Although the mar(6) was very small, the presence of euchromatin was shown, suggesting that the partial trisomy of pericentric region derived sequences is implicated in the aetiology of the abnormal phenotypes.
authors.affiliation: Department of Genetics, National Research Institute of Mother and Child, Kasprzaka 17A, 01-211 Warsaw, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Stankiewicz
authors.forename: E
authors.initials: E
authors.lastname: Bocian
authors.forename: K
authors.initials: K
authors.lastname: Jakubów-Durska
authors.forename: E
authors.initials: E
authors.lastname: Obersztyn
authors.forename: E
authors.initials: E
authors.lastname: Lato
authors.forename: H
authors.initials: H
authors.lastname: Starke
authors.forename: K
authors.initials: K
authors.lastname: Mroczek
authors.forename: T
authors.initials: T
authors.lastname: Mazurczak
mesh_terms: D000293:Adolescent; D000328:Adult; D000568:Amenorrhea / Q000235:genetics; D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000235:genetics*; D002871:Chromosome Banding; D025063:Chromosome Disorders; D002888:Chromosomes, Human, Pair 19; D002890:Chromosomes, Human, Pair 20; D002895:Chromosomes, Human, Pair 5; D002896:Chromosomes, Human, Pair 6; D002658:Developmental Disabilities / Q000235:genetics; D004487:Edema / Q000235:genetics; D019066:Facies; D005260:Female; D005819:Genetic Markers; D005838:Genotype; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D008607:Intellectual Disability / Q000235:genetics; D007621:Karyotyping; D008297:Male; D010641:Phenotype; D011110:Polymorphism, Genetic
chemical_list: D005819:Genetic Markers