Disease-specific phenotypes in iPSC-derived neural stem cells with POLG mutations.

Abstract:

:Mutations in POLG disrupt mtDNA replication and cause devastating diseases often with neurological phenotypes. Defining disease mechanisms has been hampered by limited access to human tissues, particularly neurons. Using patient cells carrying POLG mutations, we generated iPSCs and then neural stem cells. These neural precursors manifested a phenotype that faithfully replicated the molecular and biochemical changes found in patient post-mortem brain tissue. We confirmed the same loss of mtDNA and complex I in dopaminergic neurons generated from the same stem cells. POLG-driven mitochondrial dysfunction led to neuronal ROS overproduction and increased cellular senescence. Loss of complex I was associated with disturbed NAD+ metabolism with increased UCP2 expression and reduced phosphorylated SirT1. In cells with compound heterozygous POLG mutations, we also found activated mitophagy via the BNIP3 pathway. Our studies are the first that show it is possible to recapitulate the neuronal molecular and biochemical defects associated with POLG mutation in a human stem cell model. Further, our data provide insight into how mitochondrial dysfunction and mtDNA alterations influence cellular fate determining processes.

journal_name

EMBO Mol Med

journal_title

EMBO molecular medicine

authors

Liang KX,Kristiansen CK,Mostafavi S,Vatne GH,Zantingh GA,Kianian A,Tzoulis C,Høyland LE,Ziegler M,Perez RM,Furriol J,Zhang Z,Balafkan N,Hong Y,Siller R,Sullivan GJ,Bindoff LA

doi

10.15252/emmm.202012146

subject

Has Abstract

pub_date

2020-10-07 00:00:00

pages

e12146

issue

10

eissn

1757-4676

issn

1757-4684

journal_volume

12

pub_type

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