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Van Meter, Michael; Kashyap, Mehr; Rezazadeh, Sarallah; Geneva, Anthony J; Morello, Timothy D; Seluanov, Andrei; Gorbunova, Vera
Nature communications, 09/2014, Letnik: 5, Številka: 1Journal Article
L1 retrotransposons are an abundant class of transposable elements that pose a threat to genome stability and may have a role in age-related pathologies such as cancer. Recent evidence indicates that L1s become more active in somatic tissues during the course of ageing; however the mechanisms underlying this phenomenon remain unknown. Here we report that the longevity regulating protein, SIRT6, is a powerful repressor of L1 activity. Specifically, SIRT6 binds to the 5'-UTR of L1 loci, where it mono-ADP ribosylates the nuclear corepressor protein, KAP1, and facilitates KAP1 interaction with the heterochromatin factor, HP1α, thereby contributing to the packaging of L1 elements into transcriptionally repressive heterochromatin. During the course of ageing, and also in response to DNA damage, however, we find that SIRT6 is depleted from L1 loci, allowing the activation of these previously silenced retroelements.
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