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We report that HMGN1, a nucleosome-binding protein that affects chromatin structure and function, affects the growth of N-nitrosodiethylamine (DEN)-induced liver tumors. Following a single DEN injection at 2 weeks of age, Hmgn1(tm1/tm1) mice, lacking the nucleosome-binding domain of HMGN1, had earlier signs of liver tumorigenesis than their Hmgn1(+/+) littermates. Detailed gene expression profiling revealed significant differences between DEN-injected and control saline-injected mice, but only minor differences between the injected Hmgn1(tm1/tm1) mice and their Hmgn1(+/+) littermates. Pathway analysis revealed that the most significant process affected by loss of HMGN1 involves the lipid/sterol metabolic pathway. Our study indicates that in mice, loss of HMGN1 leads to transcription changes that accelerate the progression of DEN-induced hepatocarcinogenesis, without affecting the type of tumors or the final total tumor burden of these mice.

Loss of the Nucleosome-Binding Protein HMGN1 Affects the Rate of N-Nitrosodiethylamine-Induced Hepatocarcinogenesis in Mice