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PARL deficiency in mouse causes Complex III defects, coenzyme Q depletion, and Leigh-like syndrome.


ABSTRACT: The mitochondrial intramembrane rhomboid protease PARL has been implicated in diverse functions in vitro, but its physiological role in vivo remains unclear. Here we show that Parl ablation in mouse causes a necrotizing encephalomyelopathy similar to Leigh syndrome, a mitochondrial disease characterized by disrupted energy production. Mice with conditional PARL deficiency in the nervous system, but not in muscle, develop a similar phenotype as germline Parl KOs, demonstrating the vital role of PARL in neurological homeostasis. Genetic modification of two major PARL substrates, PINK1 and PGAM5, do not modify this severe neurological phenotype. Parl -/- brain mitochondria are affected by progressive ultrastructural changes and by defects in Complex III (CIII) activity, coenzyme Q (CoQ) biosynthesis, and mitochondrial calcium metabolism. PARL is necessary for the stable expression of TTC19, which is required for CIII activity, and of COQ4, which is essential in CoQ biosynthesis. Thus, PARL plays a previously overlooked constitutive role in the maintenance of the respiratory chain in the nervous system, and its deficiency causes progressive mitochondrial dysfunction and structural abnormalities leading to neuronal necrosis and Leigh-like syndrome.

SUBMITTER: Spinazzi M 

PROVIDER: S-EPMC6320509 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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PARL deficiency in mouse causes Complex III defects, coenzyme Q depletion, and Leigh-like syndrome.

Spinazzi Marco M   Radaelli Enrico E   Horré Katrien K   Arranz Amaia M AM   Gounko Natalia V NV   Agostinis Patrizia P   Maia Teresa Mendes TM   Impens Francis F   Morais Vanessa Alexandra VA   Lopez-Lluch Guillermo G   Serneels Lutgarde L   Navas Placido P   De Strooper Bart B  

Proceedings of the National Academy of Sciences of the United States of America 20181221 1


The mitochondrial intramembrane rhomboid protease PARL has been implicated in diverse functions in vitro, but its physiological role in vivo remains unclear. Here we show that <i>Parl</i> ablation in mouse causes a necrotizing encephalomyelopathy similar to Leigh syndrome, a mitochondrial disease characterized by disrupted energy production. Mice with conditional PARL deficiency in the nervous system, but not in muscle, develop a similar phenotype as germline <i>Parl</i> KOs, demonstrating the v  ...[more]

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