The uracil-DNA glycosylase UNG protects the fitness of normal and cancer B cells expressing AID.
The uracil-DNA glycosylase UNG protects the fitness of normal and cancer B cells expressing AID.
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DOI:
10.1093/narcan/zcaa019
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发表时间:
2020-09
期刊:
影响因子:
5.1
通讯作者:
Di Noia JM
中科院分区:
文献类型:
--
作者:
Safavi S;Larouche A;Zahn A;Patenaude AM;Domanska D;Dionne K;Rognes T;Dingler F;Kang SK;Liu Y;Johnson N;Hébert J;Verdun RE;Rada CA;Vega F;Nilsen H;Di Noia JM
In B lymphocytes, the uracil N-glycosylase (UNG) excises genomic uracils made by activation-induced deaminase (AID), thus underpinning antibody gene diversification and oncogenic chromosomal translocations, but also initiating faithful DNA repair. Ung−/− mice develop B-cell lymphoma (BCL). However, since UNG has anti- and pro-oncogenic activities, its tumor suppressor relevance is unclear. Moreover, how the constant DNA damage and repair caused by the AID and UNG interplay affects B-cell fitness and thereby the dynamics of cell populations in vivo is unknown. Here, we show that UNG specifically protects the fitness of germinal center B cells, which express AID, and not of any other B-cell subset, coincident with AID-induced telomere damage activating p53-dependent checkpoints. Consistent with AID expression being detrimental in UNG-deficient B cells, Ung−/− mice develop BCL originating from activated B cells but lose AID expression in the established tumor. Accordingly, we find that UNG is rarely lost in human BCL. The fitness preservation activity of UNG contingent to AID expression was confirmed in a B-cell leukemia model. Hence, UNG, typically considered a tumor suppressor, acquires tumor-enabling activity in cancer cell populations that express AID by protecting cell fitness. Activation-induced deaminase (AID) and uracil N-glycosylase (UNG) have several different functions and effects in normal and cancer B cells, with UNG protecting cell fitness from AID in both contexts and the net outcome being context dependent.
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DOI:
10.1038/nri.2016.2
发表时间:
2016-03
期刊:
Nature reviews. Immunology
影响因子:
--
作者:
Casellas R;Basu U;Yewdell WT;Chaudhuri J;Robbiani DF;Di Noia JM
通讯作者:
Di Noia JM
DOI:
10.1084/jem.20050292
发表时间:
2005-04-18
期刊:
The Journal of experimental medicine
影响因子:
--
作者:
Delbos F;De Smet A;Faili A;Aoufouchi S;Weill JC;Reynaud CA
通讯作者:
Reynaud CA
影响因子:
20.3
作者:
Greeve, J;Philipsen, A;Parwaresch, R
通讯作者:
Parwaresch, R
影响因子:
3.7
作者:
Hase, Koji;Takahashi, Daisuke;Ohno, Hiroshi
通讯作者:
Ohno, Hiroshi
影响因子:
30.8
作者:
通讯作者:
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