Mitochondrial genetic variation is enriched in G-quadruplex regions that stall DNA synthesis in vitro.

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 Genet

journal_title

Human molecular genetics

authors

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,Bro

doi

10.1093/hmg/ddaa043

subject

Has Abstract

pub_date

2020-05-28 00:00:00

pages

1292-1309

issue

8

eissn

0964-6906

issn

1460-2083

pii

5810180

journal_volume

29

pub_type

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