title: [Correlations between karyotype and phenotype in structural and numerical abnormalities of chromosome 18].
abstract: Five cases with different abnormalities of chromosome 18 are described: one case with trisomy 18, two cases with ring 18, one case with partial trisomy 18q and one case with a mosaic 18p-/iso 18q. The karyotypes of the parents were normal. Cytogenetic analysis was performed on PHA stimulated blood lymphocytes. GTG, QFQ, MTX banding techniques were used. Karyotype-phenotype correlations are made. All patients present mental retardation, hypotonia and facial dismorphisms. The different degree of mental retardation and the clinical signs are in relation to the different size of deletions or trisomies of the short or long arm of chromosome 18. In the case with mosaicism 18p-/iso18q the phenotype is determined from the chromosomal abnormality more frequent in the cells (18p-).
authors: Clinica Pediatrica dell'Università di Siena.
authors: R
authors: R
authors: Vivarelli
authors: M
authors: M
authors: Paolieri
authors: C
authors: C
authors: Anichini
authors: R
authors: R
authors: Scarinci
authors: R
authors: R
authors: Berardi
authors: L
authors: L
authors: Rosaia
authors: L
authors: L
authors: Pucci
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000235:genetics*; D025063:Chromosome Disorders; D002887:Chromosomes, Human, Pair 18; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008607:Intellectual Disability / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D010641:Phenotype
vernacular_title: Correlazioni tra cariotipo e fenotipo nelle anomalie strutturali e numeriche del cromosoma 18.