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Downregulation of death-associated protein kinase 1 (DAPK1) in chronic lymphocytic leukemia
Aparna Raval1, Stephan M Tanner, John C Byrd
1Department of Molecular Virology, Immunology, and Medical Genetics, Human Cancer Genetics Program, The Comprehensive Cancer Center at The Ohio State University, Columbus, OH 43214, USA.
Insights
Reduced expression of death-associated protein kinase 1 (DAPK1) is linked to chronic lymphocytic leukemia (CLL) predisposition. This can occur through inherited factors or epigenetic silencing, impacting both familial and sporadic CLL cases.
Area of Science:
- Hematology
- Cancer Genetics
- Molecular Biology
Background:
- Chronic lymphocytic leukemia (CLL) exhibits high heritability, yet causative mutations remain elusive.
- Understanding the genetic and epigenetic factors in CLL predisposition is crucial for diagnosis and treatment.
Purpose of the Study:
- To identify the genetic or epigenetic basis for heritable and sporadic chronic lymphocytic leukemia (CLL).
- To investigate the role of death-associated protein kinase 1 (DAPK1) in CLL development.
Main Methods:
- Analysis of DAPK1 expression in CLL patients and familial cases.
- Investigation of promoter methylation and its correlation with DAPK1 silencing.
- Identification of disease-associated haplotypes in families with CLL.
Main Results:
- Loss or reduced expression of DAPK1 is identified as a key factor in CLL predisposition.
- Epigenetic silencing of DAPK1 via promoter methylation occurs in most sporadic CLL cases.
- A disease haplotype linked to CLL was identified, with germline downregulation of DAPK1 due to HOXB7 binding.
Conclusions:
- Reduced DAPK1 expression, resulting from germline predisposition or epigenetic/somatic events, contributes significantly to CLL.
- DAPK1 is a critical tumor suppressor gene implicated in both familial and sporadic CLL.
- These findings offer new insights into the molecular pathogenesis of CLL.
Abstract:
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. DAPK1 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 DAPK1 expression. Thus, reduced expression of DAPK1 can result from germline predisposition, as well as epigenetic or somatic events causing or contributing to the CLL phenotype.
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