Journal
CELL
Volume 129, Issue 5, Pages 879-890Publisher
CELL PRESS
DOI: 10.1016/j.cell.2007.03.043
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Funding
- NCI NIH HHS [U01 CA086389, P01 CA101956, P30 CA16058, 5U01 CA86389, P30 CA016058, CA101956, R21 CA110496, CA81534, T32 CA106196, P01 CA081534, CA110496] Funding Source: Medline
- Wellcome Trust Funding Source: Medline
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The heritability of B cell chronic lymphocytic leukemia (CLL) is relatively high; however, no predisposing mutation has been convincingly identified. We show that loss or reduced expression of death-associated protein kinase 1 (DAPK1) underlies cases of heritable predisposition to CLL and the majority of sporadic CLL. Epigenetic silencing of DAPK1 by promoter methylation occurs in almost all sporadic CLL cases. Furthermore, we defined a disease haplotype, which segregates with the CLL phenotype in a large family. DAM expression of the CLL allele is downregulated by 75% in germline cells due to increased HOXB7 binding. In the blood cells from affected family members, promoter methylation results in additional loss of DAM expression. Thus, reduced expression of DAM can result from germline predisposition, as well as epigenetic or somatic events causing or contributing to the CILL phenotype.
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