In Vivo Regulation of P21 by the Kruppel-Like Factor 6 Tumor-Suppressor Gene in Mouse Liver and Human Hepatocellular Carcinoma
Oncogene (2007) 26, 4428–4434 & 2007 Nature Publishing Group All rights reserved 0950-9232/07 $30.00 www.nature.com/onc SHORT COMMUNICATION In vivo regulation of p21 by the Kruppel-like factor 6 tumor-suppressor gene in mouse liver and human hepatocellular carcinoma G Narla1,2,3,4,7, S Kremer-Tal1,3,7, N Matsumoto1,3, X Zhao1,3, S Yao5, K Kelley6, M Tarocchi1,3 and SL Friedman1,3 1Department of Medicine, The Mount Sinai School of Medicine, New York, NY, USA; 2Department of Human Genetics, The Mount Sinai School of Medicine, New York, NY, USA; 3Division of Liver Diseases, The Mount Sinai School of Medicine, New York, NY, USA; 4Division of Hematology/Oncology, The Mount Sinai School of Medicine, New York, NY, USA; 5Department of Oncological Sciences, The Mount Sinai School of Medicine, New York, NY, USA and 6Brookdale Department of Molecular, Cell and Developmental Biology, The Mount Sinai School of Medicine, New York, NY, USA Kruppel-like factor (KLF) 6 is a tumor-suppressor gene Kruppel-like factor 6 (KLF6) belongs to the Kruppel- functionally inactivated by loss of heterozygosity, somatic like family of transcription factors, which play roles in mutation and/or alternative splicing that generates a the regulationof diverse cellular processes including dominant-negative splice form, KLF6-SV1. Wild-type development, differentiation, proliferation and apopto- KLF6 (wtKLF6) expression is decreased in many human sis (Bieker, 2001). Functional inactivation of the KLF6 malignancies, which correlates with reduced patient gene occurs through several mechanisms, including loss survival. Additionally, loss of the KLF6 locus in the of heterozygosity (LOH), somatic mutationand/or absence of somatic mutation in the remaining allele occurs increased alternative splicing that yields a dominant- in a number of human cancers, raising the possibility that negative splice isoform, KLF6-SV1.
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