Abstract:
:As the powerhouses of the eukaryotic cell, mitochondria must maintain their genomes which encode proteins essential for energy production. Mitochondria are characterized by guanine-rich DNA sequences that spontaneously form unusual three-dimensional structures known as G-quadruplexes (G4). G4 structures can be problematic for the essential processes of DNA replication and transcription because they deter normal progression of the enzymatic-driven processes. In this study, we addressed the hypothesis that mitochondrial G4 is a source of mutagenesis leading to base-pair substitutions. Our computational analysis of 2757 individual genomes from two Italian population cohorts (SardiNIA and InCHIANTI) revealed a statistically significant enrichment of mitochondrial mutations within sequences corresponding to stable G4 DNA structures. Guided by the computational analysis results, we designed biochemical reconstitution experiments and demonstrated that DNA synthesis by two known mitochondrial DNA polymerases (Pol γ, PrimPol) in vitro was strongly blocked by representative stable G4 mitochondrial DNA structures, which could be overcome in a specific manner by the ATP-dependent G4-resolving helicase Pif1. However, error-prone DNA synthesis by PrimPol using the G4 template sequence persisted even in the presence of Pif1. Altogether, our results suggest that genetic variation is enriched in G-quadruplex regions that impede mitochondrial DNA replication.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Butler TJ,Estep KN,Sommers JA,Maul RW,Moore AZ,Bandinelli S,Cucca F,Tuke MA,Wood AR,Bharti SK,Bogenhagen DF,Yakubovskaya E,Garcia-Diaz M,Guilliam TA,Byrd AK,Raney KD,Doherty AJ,Ferrucci L,Schlessinger D,Ding J,Brodoi
10.1093/hmg/ddaa043subject
Has Abstractpub_date
2020-05-28 00:00:00pages
1292-1309issue
8eissn
0964-6906issn
1460-2083pii
5810180journal_volume
29pub_type
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