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Neurobiol Dis. 2018 Jun;114:129-139. doi: 10.1016/j.nbd.2018.02.010. Epub 2018 Feb 24.

Haplogroup J mitogenomes are the most sensitive to the pesticide rotenone: Relevance for human diseases.

Author information

1
Department of Pharmaceutical and Pharmacological Sciences, School of Medicine-University of Padua, Italy.
2
IRCCS Institute of Neurological Sciences of Bologna, Bologna, Italy.
3
Department of Pharmacy and Biotechnology (FABIT), University of Bologna, Bologna, Italy.
4
IRCCS "E. Medea" Scientific Institute Conegliano-Pieve di Soligo Research Center, Pieve di Soligo, Italy.
5
Dipartimento di Biologia e Biotecnologie "L. Spallanzani", University of Pavia, Pavia, Italy.
6
IRCCS Institute of Neurological Sciences of Bologna, Bologna, Italy; Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy. Electronic address: valerio.carelli@unibo.it.
7
Department of Pharmacy and Biotechnology (FABIT), University of Bologna, Bologna, Italy. Electronic address: annamaria.ghelli@unibo.it.

Abstract

There is growing evidence that the sequence variation of mitochondrial DNA (mtDNA), which clusters in population- and/or geographic-specific haplogroups, may result in functional effects that, in turn, become relevant in disease predisposition or protection, interaction with environmental factors and ultimately in modulating longevity. To unravel functional differences between mtDNA haplogroups we here employed transmitochondrial cytoplasmic hybrid cells (cybrids) grown in galactose medium, a culture condition that forces oxidative phosphorylation, and in the presence of rotenone, the classic inhibitor of respiratory Complex I. Under this experimental paradigm we assessed functional parameters such as cell viability and respiration, ATP synthesis, reactive oxygen species production and mtDNA copy number. Our analyses show that haplogroup J1, which is common in western Eurasian populations, is the most sensitive to rotenone, whereas K1 mitogenomes orchestrate the best compensation, possibly because of the haplogroup-specific missense variants impinging on Complex I function. Remarkably, haplogroups J1 and K1 fit the genetic associations previously established with Leber's hereditary optic neuropathy (LHON) for J1, as a penetrance enhancer, and with Parkinson's disease (PD) for K1, as a protective background. Our findings provide functional evidences supporting previous well-established genetic associations of specific haplogroups with two neurodegenerative pathologies, LHON and PD. Our experimental paradigm is instrumental to highlighting the subtle functional differences characterizing mtDNA haplogroups, which will be increasingly needed to dissect the role of mtDNA genetic variation in health, disease and longevity.

KEYWORDS:

Complex I; Cybrids; Haplogroups; Mitochondrial DNA; Rotenone

PMID:
29486301
DOI:
10.1016/j.nbd.2018.02.010

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