Isochromosome 6(p) is a rare chromosomal aberration in Acute Lymphoblastic Leukemia: A case report

Abstract

Cytogenetic analysis using G- banding technique was performed on bone marrow cells from a 22-year-old female who was diagnosed with Acute Lymphoblastic Leukemia . The chromosomal analysis showed a complex karyotype which included the Isochromosome 6(p) in 16 metaphases (16%) of 97 total metaphases studied . This finding suggests a strong selective pressure for loss of heterozygosity of genes located on 6q , and is in keeping with the hypothesis that one or more tumor suppressor genes might be located on the long arm of chromosome 6 . Moreover, trisomy (or tebasomy) for the short arm of chromosome 6, due to the isochromosome formation , indicating also a possible role for amplification of genes located on 6p in tumor progression in this case of acute lymphoblastic leukemia