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Microhomology-mediated end joining drives complex rearrangements and overexpression of MYC and PVT1 in multiple myeloma

Lookup NU author(s): Dr Aneta Mikulasova, Professor Graham Jackson

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Abstract

©2020 Ferrata Storti FoundationMYC is a widely acting transcription factor and its deregulation is a crucial event in many human cancers. MYC is important biologically and clinically in multiple myeloma, but the mechanisms underlying its dysregulation are poorly understood. We show that MYC rearrangements are present in 36.0% of newly diagnosed myeloma patients, as detected in the largest set of next generation sequencing data to date (n=1,267). Rearrangements were complex and associated with increased expression of MYC and PVT1, but not other genes at 8q24. The highest effect on gene expression was detected in cases where the MYC locus is juxtaposed next to super-enhancers associated with genes such as IGH, IGK, IGL, TXNDC5/BMP6, FAM46C and FOXO3. We identified three hotspots of recombination at 8q24, one of which is enriched for IGH-MYC translocations. Breakpoint analysis indicates primary myeloma rearrangements involving the IGH locus occur through non-homologous end joining, whereas secondary MYC rearrangements occur through microhomology-mediated end joining. This mechanism is different to lymphomas, where non-homologous end joining generates MYC rearrangements. Rearrangements resulted in overexpression of key genes and chromatin immunoprecipitation-sequencing identified that HK2, a member of the glucose metabolism pathway, is directly over-expressed through binding of MYC at its promoter.

Publication metadata

Author(s): Mikulasova A, Ashby C, Tytarenko RG, Qu P, Rosenthal A, Dent JA, Ryan KR, Bauer MA, Wardell CP, Hoering A, Mavrommatis K, Trotter M, Deshpande S, Yaccoby S, Tian E, Keats J, Auclair D, Jackson GH, Davies FE, Thakurta A, Morgan GJ, Walker BA

Publication type: Article

Publication status: Published

Journal: Haematologica

Year: 2020

Volume: 105

Issue: 4

Pages: 1055-1060

Online publication date: 01/04/2020

Acceptance date: 13/06/2019

ISSN (print): 0390-6078

ISSN (electronic): 1592-8721

Publisher: Ferrata Storti Foundation

URL: https://doi.org/10.3324/haematol.2019.217927

DOI: 10.3324/haematol.2019.217927

PubMed id: 31221783

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