Deletion of the Mitochondrial Complex-IV Cofactor Heme A/Farnesyltransferase Causes Focal Segmental Glomerulosclerosis and Interferon Response

Jea-Hyun Baek, Ivan G Gomez, Yukihiro Wada, Allie Roach, Don Mahad, Jeremy S Duffield

Research output: Contribution to journalArticlepeer-review

Abstract

Mutations in mitochondrial DNA as well as nuclear-encoded mitochondrial proteins have been reported to cause tubulointerstitial kidney diseases and focal segmental glomerulosclerosis (FSGS). Recently, genes and pathways affecting mitochondrial turnover and permeability have been implicated in adult-onset FSGS. Furthermore, dysfunctioning mitochondria may be capable of engaging intracellular innate immune-sensing pathways. To determine the impact of mitochondrial dysfunction in FSGS and secondary innate immune responses, we generated Cre/loxP transgenic mice to generate a loss-of-function deletion mutation of the complex IV assembly cofactor heme A/farnesyltransferase (COX10) restricted to cells of the developing nephrons. These mice develop severe, early-onset FSGS with innate immune activation and die prematurely with kidney failure. Mutant kidneys showed loss of glomerular and tubular epithelial function, epithelial apoptosis, and, in addition, a marked interferon response. In vitro modeling of Cox10 deletion in primary kidney epithelium compromises oxygen consumption, ATP generation, and induces oxidative stress. In addition, loss of Cox10 triggers a selective interferon response, which may be caused by the leak of mitochondrial DNA into the cytosol activating the intracellular DNA sensor, stimulator of interferon genes. This new animal model provides a mechanism to study mitochondrial dysfunction in vivo and demonstrates a direct link between mitochondrial dysfunction and intracellular innate immune response.

Original languageEnglish
JournalAmerican Journal of Pathology
Volume188
Issue number12
Early online date28 Sep 2018
DOIs
Publication statusPublished - Dec 2018

Fingerprint

Dive into the research topics of 'Deletion of the Mitochondrial Complex-IV Cofactor Heme A/Farnesyltransferase Causes Focal Segmental Glomerulosclerosis and Interferon Response'. Together they form a unique fingerprint.

Cite this