MicroRNA Dysregulation to Identify Novel Therapeutic Targets.

Area of Science:

• Molecular Biology
• Genetics
• Oncology

Background:

• The MYC gene's juxtaposition to immunoglobulin loci was investigated.
• The t(14;18) chromosome translocation in follicular lymphoma was characterized.
• The BCL2 gene was cloned.

Purpose of the Study:

• To investigate the role of BCL2 in Chronic Lymphocytic Leukemia (CLL).
• To identify the molecular mechanisms leading to BCL2 overexpression in CLL.
• To explore therapeutic strategies targeting BCL2 in CLL.

Main Methods:

• Gene mapping and molecular characterization of chromosomal translocations.
• MicroRNA expression analysis in CLL patient samples.
• Functional studies on microRNA regulation of BCL2.

Main Results:

• Discovery of MYC gene juxtaposition and t(14;18) translocation.
• Identification of BCL2 gene overexpression in CLL.
• Deletion of miR-15a and miR-16-1 microRNAs in most CLL cases.
• miR-15/16 identified as negative regulators of BCL2.

Conclusions:

• Loss of miR-15/16 microRNAs contributes to BCL2 overexpression in CLL.
• BCL2 is a critical oncogene in CLL pathogenesis.
• Venetoclax, targeting BCL2, shows promise for aggressive CLL treatment.