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Inactivations of p16INK4a-α, p16INK4a-β and p15INK4b genes in 2′, 3′-dideoxycytidine- and 1,3-butadiene-induced murine lymphomas
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Inactivations of p16INK4a-α, p16INK4a-β and p15INK4b genes in 2′, 3′-dideoxycytidine- and 1,3-butadiene-induced murine lymphomas
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Inactivations of p16INK4a-α, p16INK4a-β and p15INK4b genes in 2′, 3′-dideoxycytidine- and 1,3-butadiene-induced murine lymphomas
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Journal Article
Inactivations of p16INK4a-α, p16INK4a-β and p15INK4b genes in 2′, 3′-dideoxycytidine- and 1,3-butadiene-induced murine lymphomas
1998
Overview
The p16INK4a (alpha and beta form) and p15INK4b genes were analysed for homozygous deletion, hypermethylation and point mutation in B6C3F1 mouse lymphomas induced by 2',3'-dideoxycytidine or 1,3-butadiene. Although the p16INK4a-alpha gene appeared normal in DNA from 2',3'-dideoxycytidine-induced lymphomas, Southern analyses revealed homozygous deletions or rearrangements of the p16INK4a-beta and/or p15INK4b genes in four of 16 tumours. Surprisingly, two of these lymphomas showed exclusive deletions of the p16INK4a EIbeta exon. The p15INK4b promoter region was hypermethylated in two additional 2',3'-dideoxycytidine-induced lymphomas. In contrast, homozygous deletions spanning the p16INK4a and p15INK4b loci were observed in only two of 31 1,3-butadiene-induced tumours. Thus, these cyclin dependent kinase inhibitor genes may play a significant role in chemically induced mouse lymphomas and support the contention of tumour suppressor activity for the p19ARF protein encoded by the p16INK4a-beta gene. Different genetic pathways may be involved in the development of these chemically induced tumours since we have previously shown that mutations in p53 and ras genes are common in 1,3-butadiene- but not 2',3'-dideoxycytidine-induced lymphomas.
Publisher
Nature Publishing Group
Subject
