MLL-SEPTIN gene fusions in hematological malignancies

Area of Science:

• Hematology
• Molecular Biology
• Genetics

Background:

• The mixed lineage leukemia (MLL) gene is frequently rearranged in human leukemias.
• MLL rearrangements involve diverse fusion partners, including nuclear proteins, cytoplasmic proteins, histone acetyltransferases, and septins.

Purpose of the Study:

• To investigate the role of MLL-SEPTIN rearrangements in hematological malignancies.
• To explore the clinicopathogenetic associations of MLL-SEPTIN fusions.

Main Methods:

• Analysis of MLL rearrangements involving five different septin genes (SEPT2, SEPT5, SEPT6, SEPT9, SEPT11).
• Characterization of chimeric fusion proteins resulting from MLL-SEPTIN gene fusions.
• Identification of heterogeneous breaks in MLL and septin introns leading to distinct fusion variants.

Main Results:

• MLL-SEPTIN rearrangements were identified in de novo and therapy-related myeloid neoplasia in both children and adults.
• Distinct gene fusion variants arise from heterogeneous breaks in MLL and septin introns.
• Clinicopathogenetic associations of MLL-SEPTIN rearrangements are emerging.

Conclusions:

• Septin cytoskeleton abnormalities and MLL deregulation are potentially involved in the pathogenesis of hematological malignancies.
• Understanding MLL-SEPTIN fusions provides insights into leukemia development.