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  • Original Paper
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Identification of candidate genes on chromosome band 20q12 by physical mapping of translocation breakpoints found in myeloid leukemia cell lines

Abstract

Deletions of the long arm of chromosome 20 have been reported in a wide range of myeloid disorders and may reflect loss of critical tumor suppressor gene(s). To identify such candidate genes, 65 human myeloid cell line DNAs were screened by polymerase chain reaction (PCR) for evidence of allelic loss at 39 highly polymorphic loci on the long arm of chromosome 20. A mono-allelic pattern was present in eight cell lines at multiple adjacent loci spanning the common deleted regions (CDRs) previously defined in primary hematological samples, suggesting loss of heterozygosity (LOH) at 20q. Fluorescence in situ hybridization (FISH) was then performed using a series of yeast artificial chromosomes (YACs) ordered in the CDR, and in five of eight cell lines, the deletions resulted from cytogenetically detectable whole chromosomal loss or large interstitial deletion, whereas in another cell line deletion was associated with an unbalanced translocation. LOH in the CMK megakaryocytic cell line, which has a hypotetraploid karyotype, was associated with a der(20)t(1;20)(q32;q12)x2 leading to complete deletion of the CDR. Three additional unbalanced translocations were found within the CDR and all three breakpoints mapped to a single YAC. We then used a series of P1 artificial chromosomes (PACs) spanning this YAC clone, and two PACs produced ‘split’ signals suggesting that they each span one of these breakpoints. Exon trapping using PACs that overlap the breakpoint regions yielded portions of six genes and evaluation of these genes as candidate tumor suppressor genes is underway. The limited information available about these genes suggests that the h-l(3)mbt gene is the most attractive candidate.

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Acknowledgements

We are grateful to the following investigators for providing cell lines: B Andersson, M Baumanne, H Ben-Bassat, R Berthier, B Clarkson, J Cossman, W Dai, Z Estrov, C Gambacorti, J Goldman, H Hirai, J Kao, N Komatsu, I Kubonishi, T Kudo, M Kurosawa, M Lieberman, Y Matsuo, I Miyoshi, D Morgan, J Okamura, A Rimbaldi, L Skinnider, T Tange, T Takahashi, E Thompson, M Tomonaga. We thank Hong Wu for technical assistance, Frederic Gilles and Andrew Zelenetz for their assistance and advice in pulse-field gel electrophoresis, and Ellie Park for her assistance in preparing the manuscript. This work was supported by the Gabrielle Rich Leukemia Research Fund, the Renny Saltzman Leukemia Research Fund and NIH grant RO1DK43025 (SD Nimer)

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MacGrogan, D., Alvarez, S., DeBlasio, T. et al. Identification of candidate genes on chromosome band 20q12 by physical mapping of translocation breakpoints found in myeloid leukemia cell lines. Oncogene 20, 4150–4160 (2001). https://doi.org/10.1038/sj.onc.1204540

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