Interstitial telomeric repeats-associated DNA breaks

Olga Shubernetskaya, Dmitry Skvortsov, Sergey Evfratov, Maria Rubtsova, Elena Belova, Olga Strelkova, Varvara Cherepaninets, Oxana Zhironkina, Alexey Olovnikov, Maria Zvereva, Olga Dontsova, Igor Kireev

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    During a cell's lifespan, DNA break formation is a common event, associated with many processes, from replication to apoptosis. Most of DNA breaks are readily repaired, but some are meant to persist in time, such as the chromosome ends, protected by telomeres. Besides them, eukaryotic genomes comprise shorter stretches of interstitial telomeric repeats. We assumed that the latter may also be associated with the formation of DNA breaks meant to persist in time. In zebrafish and mouse embryos, cells containing numerous breakage foci were identified. These breaks were not associated with apoptosis or replication, nor did they seem to activate DNA damage response machinery. Unlike short-living, accidental sparse breaks, the ones we found seem to be closely associated, forming discrete break foci. A PCR-based method was developed, allowing specific amplification of DNA regions located between inverted telomeric repeats associated with breaks. The cloning and sequencing of such DNA fragments were found to denote some specificity in their distribution for different tissue types and development stages.

    Original languageEnglish
    Pages (from-to)641-653
    Number of pages13
    JournalNucleus
    Volume8
    Issue number6
    DOIs
    Publication statusPublished - 2 Nov 2017

    Keywords

    • Chromatin
    • development
    • DNA breaks
    • ETUNEL
    • interstitial telomeric repeats
    • mouse
    • zebrafish

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