Research Papers:

Integrative analysis of DNA copy number, DNA methylation and gene expression in multiple myeloma reveals alterations related to relapse

Patryk Krzeminski, Luis A. Corchete, Juan L. García, Lucía López-Corral, Encarna Fermiñán, Eva M. García, Ana A. Martín, Jesús M. Hernández-Rivas, Ramón García-Sanz, Jesús F. San Miguel and Norma C. Gutiérrez _

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Oncotarget. 2016; 7:80664-80679. https://doi.org/10.18632/oncotarget.13025

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Patryk Krzeminski1,2, Luis A. Corchete1, Juan L. García2, Lucía López-Corral1,2, Encarna Fermiñán3, Eva M. García3, Ana A. Martín1, Jesús M. Hernández-Rivas1,2, Ramón García-Sanz1,2, Jesús F. San Miguel4, Norma C. Gutiérrez1,2

1Departamento de Hematología, Hospital Universitario, IBSAL, IBMCC (USAL-CSIC), Salamanca, Spain

2Centro de Investigación del Cáncer-IBMCC (USAL-CSIC), Salamanca, Spain

3Unidad de Genómica y Proteómica, Centro de Investigación del Cáncer-IBMCC (USAL-CSIC), Salamanca, Spain

4Clínica Universidad de Navarra, Centro de Investigaciones Médicas Aplicadas (CIMA), Pamplona, Spain

Correspondence to:

Norma C. Gutiérrez, email: [email protected]

Keywords: multiple myeloma, DNA methylation, microarrays, SNP, SORL1

Received: February 29, 2016     Accepted: October 21, 2016     Published: November 02, 2016


Multiple myeloma (MM) remains incurable despite the introduction of novel agents, and a relapsing course is observed in most patients. Although the development of genomic technologies has greatly improved our understanding of MM pathogenesis, the mechanisms underlying relapse have been less thoroughly investigated. In this study, an integrative analysis of DNA copy number, DNA methylation and gene expression was conducted in matched diagnosis and relapse samples from MM patients. Overall, the acquisition of abnormalities at relapse was much more frequent than the loss of lesions present at diagnosis, and DNA losses were significantly more frequent in relapse than in diagnosis samples. Interestingly, copy number abnormalities involving more than 100 Mb of DNA at relapse significantly affect the gene expression of these samples, provoking a particular deregulation of the IL-8 pathway. On the other hand, no significant modifications of gene expression were observed in those samples with less than 100 Mb affected by chromosomal changes. Although several statistical approaches were used to identify genes whose abnormal expression at relapse was regulated by methylation, only two genes that were significantly deregulated in relapse samples (SORL1 and GLT1D1) showed a negative correlation between methylation and expression. Further analysis revealed that DNA methylation was involved in regulating SORL1 expression in MM. Finally, relevant changes in gene expression observed in relapse samples, such us downregulation of CD27 and P2RY8, were most likely not preceded by alterations in the corresponding DNA. Taken together, these results suggest that the genomic heterogeneity described at diagnosis remains at relapse.

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