TALEN-Induced Double-Strand Break Repair of CTG Trinucleotide Repeats.

Abstract:

:Trinucleotide repeat expansions involving CTG/CAG triplets are responsible for several neurodegenerative disorders, including myotonic dystrophy and Huntington's disease. Because expansions trigger the disease, contracting repeat length could be a possible approach to gene therapy for these disorders. Here, we show that a TALEN-induced double-strand break was very efficient at contracting expanded CTG repeats in yeast. We show that RAD51, POL32, and DNL4 are dispensable for double-strand break repair within CTG repeats, the only required genes being RAD50, SAE2, and RAD52. Resection was totally abolished in the absence of RAD50 on both sides of the break, whereas it was reduced in a sae2Δ mutant on the side of the break containing the longest repeat tract, suggesting that secondary structures at double-strand break ends must be removed by the Mre11-Rad50 complex and Sae2. Following the TALEN double-strand break, single-strand annealing occurred between both sides of the repeat tract, leading to repeat contraction.

journal_name

Cell Rep

journal_title

Cell reports

authors

Mosbach V,Poggi L,Viterbo D,Charpentier M,Richard GF

doi

10.1016/j.celrep.2018.01.083

subject

Has Abstract

pub_date

2018-02-20 00:00:00

pages

2146-2159

issue

8

issn

2211-1247

pii

S2211-1247(18)30147-5

journal_volume

22

pub_type

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