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Allelic Losses on Chromosome 6q25 in Hodgkin and Reed Sternberg Cells¹

Department of Internal Medicine I [D. R., N. D., A. S-J., R. K. T., V. Di., J. W.] and Institute of Pathology [V. Dr.], University of Cologne, 50924 Cologne and Institute of Pathology [P. S.], University of Würzburg, 97080 Würzburg, Germany

We established a molecular cytogenetic approach to identify consistent genetic aberrations in classical Hodgkin lymphoma. Single laser-micromanipulated Hodgkin and Reed Sternberg (H-RS) cells and the respective germ line tissue were PCR-amplified using highly polymorphic microsatellite probes. Loss of heterozygosity and genomic imbalances of the fluorochrome-labeled microsatellites were determined by fragment length analysis. Eleven cases of in classical Hodgkin lymphoma (cHL) were initially screened with 21 microsatellite markers scattered over the entire genome. Loss of heterozygosity was detected in >40% of informative loci in most cases indicating a deletion of a substantial part of the genome of H-RS cells. Allelic losses and imbalances on chromosome 6q were detected in most of these cases. A deletion mapping of 6q was performed in 16 cases of cHL. This detailed analysis of 6q led to the identification of a 3.3-Mbp region around D6S311 flanked by D6S978 and D6S1564 that was altered in 11 of 14 cases of cHL analyzed. In conclusion, allelotyping of single H-RS cells revealed monoallelic chromosomal deletions and genomic imbalances on 6q that might affect genes critically involved in the pathogenesis of H-RS cells.

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