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Gain and/or amplification of chromosome 1q are frequently found in Multiple Myeloma (MM).

ABSTRACT: Background: Gain and/or amplification of chromosome 1q are frequently found in Multiple Myeloma (MM). The number of 1q copies correlates with a poor prognosis. The aim of this work is to study the impact on the clinical outcome and the trascriptomic changes induced by Gain1q (3 copies of 1q, 3X) and amplification 1q (Amp1q, ≥4 copies of 1q, 4X) in MM patients enrolled in the CoMMpass study (NCT145429). Methods: Fluorescence in situ hybridization (FISH) in CD138+ purified bone marrow plasma cells was centralized and performed at baseline. The cut-off level for Gain1q was 10% of nuclei with ≥3 copies of 1q (3X), while Amp1q was defined as ≥ 20% of nuclei with ≥4 copies of 1q (4X). Transcriptome data from patients were used to find differentially expressed genes (DEGs) in gain (3X) and amp1q (4X) patients.

ORGANISM(S): Homo sapiens

PROVIDER: GSE193427 | GEO | 2023/01/16

REPOSITORIES: GEO

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Project description:Ependymoma (EPN) posterior fossa group A (PFA) has the highest rate of recurrence and the worst prognosis of all EPN types. At relapse, it is typically incurable even with re-resection and re-irradiation. The biology of recurrent PFA EPN remains largely unknown, which hinders clinical advances. In this large longitudinal multicenter study, we examined matched samples of primary and recurrent disease from PFA EPN patients (n=95) to investigate the biology of recurrence. DNA methylomic data was used to measure copy number variants (CNVs), revealing progressive large scale chromosome gains and losses in successive recurrences. These CNV changes were dominated by chromosome 1q gain and/or 6q loss (1q+/6q-), both previously identified as high-risk factors in PFA EPN, which were present in ~20% at presentation but increased to ~60% at 1st recurrence. These CNV changes were correlated with hypomethylation of heterochromatin associated DNA at presentation. Evolution of chromosomal aberrations was further explored using CNV analysis of single-nuclei RNAseq on approximately 46,000 PFA EPN cells from 6 matched pairs of primary and 1st relapse tumors that harbored CNV changes at recurrence. No evidence of rare subclones in primary tumors was observed, suggesting that chromosomal rearrangement events occur after initial presentation. Cellular and molecular characteristics associated with CNVs were examined by single-nuclei RNAseq, bulk transcriptomic analysis and immunohistochemistry, revealing that 1q+/6q- PFA have a significantly higher mitotic index, increased proportions of proliferative epithelial progenitors and decreased differentiated neoplastic subpopulations. Multivariate survival analyses showed that cases with 1q gain or 6q loss at 1st recurrence were significantly more likely to recur than cases with no 1q or 6q change. The high prevalence of 1q+/6q- at recurrence and the associated shortened survival, suggest that both these abnormalities should be routinely tested for, and used for trial stratification.

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Gain and/or amplification of chromosome 1q are frequently found in Multiple Myeloma (MM).

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