title: Novel tandem triplication of 1q in a patient with a myelodysplastic syndrome.
abstract: This is a report of a patient with a myelodysplastic syndrome characterized by symptomatic neutropenia whose bone marrow aspirates have consistently demonstrated an unusual cytogenetic anomaly. The abnormality present in all metaphases consisted of a tandem triplication of a portion of the long arm of chromosome #1, resulting in tetrasomy of a section of this chromosome ( 1q21 -32). Duplications of this portion of chromosome #1 were observed as a nonrandom event in various malignant states. In addition, these precise breakpoints can be increasingly correlated with tandem duplications.
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D025063:Chromosome Disorders; D002900:Chromosomes, Human, 1-3; D003110:Colonic Neoplasms / Q000235:genetics; D006801:Humans; D007621:Karyotyping; D008297:Male; D008875:Middle Aged; D009196:Myeloproliferative Disorders / Q000235:genetics*