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Structural Maintenance of Chromosomes 5/6 complex dysfunction enables tumor mutagenesis.

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    Structural Maintenance of Chromosomes (SMC) 5/6 gene variants in tumors elevate tumor mutational burden and predict better immunotherapy response, improving patient survival. This suggests SMC5/6 status is crucial for cancer diagnostics and targeted therapies.

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    Area of Science:

    • Genomics
    • Cancer Biology
    • Molecular Oncology

    Background:

    • The Structural Maintenance of Chromosomes (SMC) 5/6 complex is vital for genome stability, but its role in cancer remains unclear.
    • SMC5/6 dysfunction causes genome instability, yet its somatic inactivation in cancer is understudied.

    Purpose of the Study:

    • To investigate the prevalence and consequences of SMC5/6 gene dysfunction in human cancers.
    • To analyze the association between SMC5/6 alterations and tumor mutational burden (TMB), patient survival, and immunotherapy response.

    Main Methods:

    • Pan-cancer analysis of SMC5/6 alterations (copy number and small variants) across three large tumor databases.
    • Correlation analysis between SMC5/6 variants, TMB, and patient survival outcomes.
    • Assessment of immunotherapy response in a colorectal cancer cohort with SMC5/6 variants.

    Main Results:

    • Thousands of tumors across all tissue types showed copy number alterations or small variants in SMC5/6 genes.
    • Deleterious SMC5/6 variants, not copy number changes, correlated with elevated TMB, driven by POLE dysfunction and MMRd.
    • Patients with SMC5/6 variants had improved survival, partly due to enhanced response to immunotherapy in colorectal cancer.

    Conclusions:

    • SMC5/6 gene dysfunction is a predictive biomarker for elevated TMB and immunotherapy susceptibility.
    • SMC5/6 status should be considered in cancer diagnostics for prognostic insights and personalized treatment strategies.