Abstract:
:Patients with ataxia-telangiectasia (A-T) lack a functional ATM kinase protein and exhibit defective repair of DNA double-stranded breaks and response to oxidative stress. We show that CRISPR/Cas9-assisted gene correction combined with piggyBac (PB) transposon-mediated excision of the selection cassette enables seamless restoration of functional ATM alleles in induced pluripotent stem cells from an A-T patient carrying compound heterozygous exonic missense/frameshift mutations, and from a patient with a homozygous splicing acceptor mutation of an internal coding exon. We show that the correction of one allele restores expression of ~ 50% of full-length ATM protein and ameliorates DNA damage-induced activation (auto-phosphorylation) of ATM and phosphorylation of its downstream targets, KAP-1 and H2AX. Restoration of ATM function also normalizes radiosensitivity, mitochondrial ROS production and oxidative-stress-induced apoptosis levels in A-T iPSC lines, demonstrating that restoration of a single ATM allele is sufficient to rescue key ATM functions. Our data further show that despite the absence of a functional ATM kinase, homology-directed repair and seamless correction of a pathogenic ATM mutation is possible. The isogenic pairs of A-T and gene-corrected iPSCs described here constitute valuable tools for elucidating the role of ATM in ageing and A-T pathogenesis.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Ovchinnikov DA,Withey SL,Leeson HC,Lei UW,Sundarrajan A,Junday K,Pewarchuk M,Yeo AJ,Kijas AW,Lavin MF,Wolvetang EJdoi
10.1093/hmg/ddaa023subject
Has Abstractpub_date
2020-04-15 00:00:00pages
990-1001issue
6eissn
0964-6906issn
1460-2083pii
5731476journal_volume
29pub_type
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