title: Trisomy 9p resulting from de novo 9/15 translocation and a 9p isochromosome.
abstract: Trisomy 9p with de novo 9/15 translocation and 9p isochromosome was observed in a mentally defective boy with typical clinical features for this syndrome. This chromosomal aberration is probably caused by the pericentric inversion of chromosome 9 of the patient's father.
mesh_terms: D002675:Child, Preschool; D002871:Chromosome Banding; D002901:Chromosomes, Human, 13-15; D002906:Chromosomes, Human, 6-12 and X; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D010375:Pedigree; D014178:Translocation, Genetic; D014314:Trisomy