title: Partial trisomy 18q in a newborn with typical 18 trisomy phenotype.
abstract: This paper describes a case of partial trisomy of almost the entire long arm of chromosome 18 in a newborn with classic trisomy-18 phenotype, resulting from a de novo unbalanced 181/21p translocation: karyotype: 46,XX,-21,t(18;21)(18qter leads to 18q11 ::21p12 leads to 21qter). A review of the other reported cases of partial trisomy 18 suggests that a critical segment in chromosome 18, corresponding to bands q11-q12, might be responsible for most of the signs of trisomy 18, including failure to thrive and early death.
mesh_terms: D002871:Chromosome Banding; D002902:Chromosomes, Human, 16-18; D002904:Chromosomes, Human, 21-22 and Y; D005260:Female; D014644:Genetic Variation; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010641:Phenotype; D014178:Translocation, Genetic; D014314:Trisomy