TP53 deficiency permits chromosome abnormalities and karyotype heterogeneity in acute myeloid leukemia

• Verfasst von: Cazzola, Anna [VerfasserIn]
• Verfasst von: Jauch, Anna [VerfasserIn]
• Verfasst von: Krämer, Alwin [VerfasserIn]
• Titel: TP53 deficiency permits chromosome abnormalities and karyotype heterogeneity in acute myeloid leukemia
• Verf.angabe: Anna Cazzola, Christin Schlegel, Ilka Jansen, Tilmann Bochtler, Anna Jauch, Alwin Krämer
• E-Jahr: 2019
• Jahr: 23 August 2019
• Umfang: 9 S.
• Fussnoten: Gesehen am 23.03.2020
• Titel Quelle: Enthalten in: Leukemia
• Ort Quelle: London : Springer Nature, 1997
• Jahr Quelle: 2019
• Band/Heft Quelle: 33(2019), 11, Seite 2619-2627
• ISSN Quelle: 1476-5551
• DOI: doi:10.1038/s41375-019-0550-5
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1693150050

Abstract

Abnormal karyotypes are common in cancer cells and frequently observed in acute myeloid leukemia (AML), in which complex karyotype aberrations are associated with poor prognosis. How exactly abnormal karyotypes arise and are propagated in AML is unclear. TP53 mutations and deletions are frequent in complex karyotype AML, suggesting a role of TP53 alterations in the development of chromosome abnormalities. Here, we generated isogenic TP53-knockout versions of the euploid AML cell line EEB to investigate the impact of TP53 on karyotype stability. We show that chromosome abnormalities spontaneously arise in TP53-deficient cells. Numerical aneuploidy could, to some extent, be propagated in a TP53-proficient setting, indicating that it does not necessarily trigger TP53 activation. In contrast, tolerance to structural chromosome aberrations was almost entirely restricted to TP53-knockout clones, all of which were able to continue proliferation in the presence of damaged DNA. Mechanistically, as a source of chromosome aberrations, limited numerical but not structural chromosomal instability was tolerated by TP53-wildtype cells. In contrast, structural instability was found only in TP53-knockout cells. Together, in myeloid cells TP53 loss allows for the development of complex karyotype aberrations and karyotype heterogeneity by perpetuation of chromosome segregation errors.