期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 22, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/ijms22052365
关键词
alternative lengthening of telomeres (ALT); DNA polymerase λ DNA double-strand breaks (DSBs); extra-chromosomal telomeric repeats (ECTRs); promyelocytic leukemia (PML) bodies; telomere dysfunction-induced foci (TIFs); telomere stress; microhomology-mediated strand transfer (MMST) activity
资金
- Oncosuisse
- Swiss National Science Foundation
- University of Zurich
- Italian Cancer Research Association (AIRC) [IG15868, IG20762, MFAG2016 18811, 12710]
- Italian Cancer Research Foundation [24263]
- Italian Cancer Research Association (FIRC-AIRC) [24263]
- Fondazione Adriano Buzzati-Traverso
- AIRC [12971]
- Cariplo Foundation [2014-0812, 2014-1215]
- Fondazione Telethon [GGP17111]
- PRIN 2010-2011
- PRIN 2015
- Italian Ministry of Education Universities and Research
- Accordo Quadro Regione Lombardia-CNR
- European Research Council [322726]
- AriSLA (project 'DDRNA and ALS') 2016
- AIRC 5 1000 [21091]
- FRRB (Fondazione Regionale per la Ricerca Biomedica) under the framework of EJPRD (the European Joint Program on Rare Diseases) EJP RD COFUND-EJP [825575]
- Fondazione Italiana di Ricerca per la Sclerosi Laterale Amiotrofica [DDRNAALS]
- Initial Training Network (ITN) grant (CodeAge) from the European Commission [316354]
- Swiss Cancer League
- Institut National du Cancer (PLBIO 2016)
- Agence Nationale de la Recherche (ANR PRC 2016)
- Labex TOUCAN
- La Ligue contre le Cancer (Equipe labellisee 2017)
This study reveals that silencing human DNA polymerase (Pol lambda) in ALT cells represses ALT activity and induces telomeric stress, while replication stress in the absence of Pol lambda strongly affects the survival of ALT cells. Additionally, Pol lambda can promote annealing of telomeric repeats and is regulated by TERRA and replication protein A, with the POT1/TPP1 heterodimer stimulating Pol lambda activity.
Telomerase negative cancer cell types use the Alternative Lengthening of Telomeres (ALT) pathway to elongate telomeres ends. Here, we show that silencing human DNA polymerase (Pol lambda) in ALT cells represses ALT activity and induces telomeric stress. In addition, replication stress in the absence of Pol lambda, strongly affects the survival of ALT cells. In vitro, Pol lambda can promote annealing of even a single G-rich telomeric repeat to its complementary strand and use it to prime DNA synthesis. The noncoding telomeric repeat containing RNA TERRA and replication protein A negatively regulate this activity, while the Protection of Telomeres protein 1 (POT1)/TPP1 heterodimer stimulates Pol lambda. Pol lambda associates with telomeres and colocalizes with TPP1 in cells. In summary, our data suggest a role of Pol lambda in the maintenance of telomeres by the ALT mechanism.
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