Journal
SCIENCE CHINA-LIFE SCIENCES
Volume 64, Issue 9, Pages 1463-1472Publisher
SCIENCE PRESS
DOI: 10.1007/s11427-020-1819-8
Keywords
mtDNA; CRSIPR; Cas9; genome editing; microhomologous region
Categories
Funding
- National Key R&D Program of China [2018YFA0107304]
- Zhejiang Provincial Natural Science Foundation of China [LQ18C060003]
- Science Technology Project of Zhejiang Province [2017C37176]
- Wenzhou City Grant [Y20170024]
- Wenzhou City Key Innovation Team of Reproductive Genetics Grant, Zhejiang, China [C20170007]
- Eye Hospital of Wenzhou Medical University [KYQD161204]
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This study demonstrates the use of engineered CRISPR/Cas9 to induce numerous insertion/deletion events in mitochondrial DNA, revealing a mechanism triggered by double-strand breaks and how mutations can be improved through multiple sgRNAs and a DSB repair inhibitor. These findings provide insights into the mechanisms of mtDNA mutations and mitochondrial gene therapy for diseases involving pathogenic mtDNA.
Genetic manipulation of mitochondrial DNA (mtDNA) could be harnessed for deciphering the gene function of mitochondria; it also acts as a promising approach for the therapeutic correction of pathogenic mutation in mtDNA. However, there is still a lack of direct evidence showing the edited mutagenesis within human mtDNA by clustered regularly interspaced short palindromic repeats-associated protein 9 (CRISPR/Cas9). Here, using engineered CRISPR/Cas9, we observed numerous insertion/deletion (InDel) events at several mtDNA microhomologous regions, which were triggered specifically by double-strand break (DSB) lesions within mtDNA. InDel mutagenesis was significantly improved by sgRNA multiplexing and a DSB repair inhibitor, iniparib, demonstrating the evidence of rewiring DSB repair status to manipulate mtDNA using CRISPR/Cas9. These findings would provide novel insights into mtDNA mutagenesis and mitochondrial gene therapy for diseases involving pathogenic mtDNA.
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