Genome instability in multiple myeloma.

Area of Science:

• Genetics and Genomics
• Oncology
• Molecular Biology

Background:

• Multiple myeloma (MM) is an incurable plasma cell malignancy with a complex genomic landscape.
• Chromosomal instability (CIN) is a frequent hallmark of MM, involving copy number and structural alterations.
• CIN contributes to the malignant transformation and progression of plasma cells.

Purpose of the Study:

• To review the mechanisms by which CIN drives genomic instability in multiple myeloma.
• To explore the role of specific genetic events, cell-cycle checkpoint interference, and novel CIN forms (chromothripsis, chromoplexy).
• To evaluate the impact of the tumor microenvironment and mutational signatures on MM genome instability.

Main Methods:

• Literature review focusing on genetic events, chromosomal instability, and multiple myeloma.
• Analysis of primary and secondary genetic events caused by CIN.
• Evaluation of the tumor microenvironment's contribution to CIN and mutational signatures in MM.

Main Results:

• CIN-induced genetic events accelerate plasma cell proliferation by interfering with cell-cycle checkpoints.
• Specific CIN forms like chromothripsis and chromoplexy are implicated in MM pathogenesis.
• The tumor microenvironment and certain mutational signatures exacerbate genome instability in MM.

Conclusions:

• CIN is a critical driver of genomic heterogeneity and proliferation in multiple myeloma.
• Assessing CIN in MM and precursor states can aid in predicting disease progression and relapse risk.
• Understanding CIN mechanisms may reveal novel therapeutic targets for multiple myeloma treatment.