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Allelic loss and promoter hypermethylation of the p15INK4b gene features in mouse radiation-induced lymphoid - but not myeloid - leukaemias.
Cleary, H J; Boulton, E; Plumb, M.
Affiliation
  • Cleary HJ; MRC Radiation and Genome Stability Unit, Chilton, Didcot, Oxford OX11 0RD, UK.
Leukemia ; 13(12): 2049-52, 1999 Dec.
Article in En | MEDLINE | ID: mdl-10602427
Mouse radiation-induced acute myeloid leukaemias (AMLs) which arose in a (CBA/H x C57BL/6) genetic background have a 45% incidence of loss of heterozygosity (LOH) on chromosome 4. Frequent chromosome 4 LOH in mouse radiation-induced (C57BL/6 x RF/J) thymic lymphomas (TLs) is associated with promoter/exon 1 region hypermethylation of the remaining p15INK4b and p16INK4a alleles, so this may be common to mouse radiation myeloid and lymphoid leukaemogenesis. We addressed the question of p15INK4b/p16INK4a/p19ARF gene promoter hypermethylation in radiation-induced AMLs by comparison to TLs which arose in a similar (C57BL/6 x CBA/H) genetic background as a consequence of the same initiating dose of 3 Gy X-rays. Only one homozygous deletion was detected in the approximately 100 leukaemias analysed. p15INK4b gene promoter/exon 1 hypermethylation was readily detected (21%) in the lymphoid but not myeloid (3.1%) leukaemias, and p16INK4a and p19ARF gene promoter/exon 1 methylation was rare (<3%) in both. Thus, allelic loss and promoter hypermethylation of the p15INK4b gene is particular to radiation-induced lymphoid leukaemias and is independent of p16INK4a and p19ARF gene promoter/exon 1 hypermethylation.
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Collection: 01-internacional Database: MEDLINE Main subject: Transcription Factors / Leukemia, Lymphoid / Leukemia, Radiation-Induced / Leukemia, Myeloid / Chromosome Deletion / Promoter Regions, Genetic / Cell Cycle Proteins / DNA Methylation / Tumor Suppressor Proteins / Microtubule Proteins Limits: Animals Language: En Journal: Leukemia Year: 1999 Document type: Article
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Collection: 01-internacional Database: MEDLINE Main subject: Transcription Factors / Leukemia, Lymphoid / Leukemia, Radiation-Induced / Leukemia, Myeloid / Chromosome Deletion / Promoter Regions, Genetic / Cell Cycle Proteins / DNA Methylation / Tumor Suppressor Proteins / Microtubule Proteins Limits: Animals Language: En Journal: Leukemia Year: 1999 Document type: Article