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PMID: 24003133 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Tissue- and cell-type-specific manifestations of heteroplasmic mtDNA 3243A>G mutation in human induced pluripotent stem cell-derived disease model.

Hämäläinen RH, Manninen T, Koivumäki H, Kislin M, Otonkoski T, Suomalainen A

Abstract

Mitochondrial DNA (mtDNA) mutations manifest with vast clinical heterogeneity. The molecular basis of this variability is mostly unknown because the lack of model systems has hampered mechanistic studies. We generated induced pluripotent stem cells from patients carrying the most common human disease mutation in mtDNA, m.3243A>G, underlying mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS) syndrome. During reprogramming, heteroplasmic mtDNA showed bimodal segregation toward homoplasmy, with concomitant changes in mtDNA organization, mimicking mtDNA bottleneck during epiblast specification. Induced pluripotent stem cell-derived neurons and various tissues derived from teratomas manifested cell-type specific respiratory chain (RC) deficiency patterns. Similar to MELAS patient tissues, complex I defect predominated. Upon neuronal differentiation, complex I specifically was sequestered in perinuclear PTEN-induced putative kinase 1 (PINK1) and Parkin-positive autophagosomes, suggesting active degradation through mitophagy. Other RC enzymes showed normal mitochondrial network distribution. Our data show that cellular context actively modifies RC deficiency manifestation in MELAS and that autophagy is a significant component of neuronal MELAS pathogenesis.

Keywords
disease modeling mitochondria
MeSH Terms
Blotting, Western DNA, Mitochondrial/genetics Electron Transport/genetics Electron Transport Complex I/metabolism Fluorescent Antibody Technique Humans Image Processing, Computer-Assisted Immunohistochemistry Induced Pluripotent Stem Cells/metabolism MELAS Syndrome/genetics,metabolism Microsatellite Repeats/genetics Microscopy, Electron Microscopy, Fluorescence Neurons/metabolism Phagosomes/metabolism Point Mutation/genetics Protein Kinases/metabolism Statistics, Nonparametric
Chemicals
DNA, Mitochondrial Protein Kinases PTEN-induced putative kinase Electron Transport Complex I
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Hämäläinen Riikka H
Research Programs Unit, Molecular Neurology, Biomedicum-Helsinki, University of Helsinki, 00280, Helsinki, Finland.
Manninen Tuula
Koivumäki Hanna
Kislin Mikhail
Otonkoski Timo
Suomalainen Anu
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
1091-6490
Published
2013-09-17
Epub
2013-00-03
Pages
E3622-30
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC3780874
Subset
IM
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