Variants in ATP5F1B are associated with dominantly inherited dystonia

Alessia Nasca, Niccolò E. Mencacci, Federica Invernizzi, Michael Zech, Ignacio J. Keller Sarmiento, Andrea Legati, Chiara Frascarelli, Bernabe I. Bustos, Luigi M. Romito, Dimitri Krainc, Juliane Winkelmann, Miryam Carecchio, Nardo Nardocci, Giovanna Zorzi, Holger Prokisch, Steven J. Lubbe, Barbara Garavaglia, Daniele Ghezzi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

ATP5F1B is a subunit of the mitochondrial ATP synthase or complex V of the mitochondrial respiratory chain. Pathogenic variants in nuclear genes encoding assembly factors or structural subunits are associated with complex V deficiency, typically characterized by autosomal recessive inheritance and multisystem phenotypes. Movement disorders have been described in a subset of cases carrying autosomal dominant variants in structural subunits genes ATP5F1A and ATP5MC3. Here, we report the identification of two different ATP5F1B missense variants (c.1000A>C; p.Thr334Pro and c.1445T>C; p.Val482Ala) segregating with early-onset isolated dystonia in two families, both with autosomal dominant mode of inheritance and incomplete penetrance. Functional studies in mutant fibroblasts revealed no decrease of ATP5F1B protein amount but severe reduction of complex V activity and impaired mitochondrial membrane potential, suggesting a dominant-negative effect. In conclusion, our study describes a new candidate gene associated with isolated dystonia and confirms that heterozygous variants in genes encoding subunits of the mitochondrial ATP synthase may cause autosomal dominant isolated dystonia with incomplete penetrance, likely through a dominant-negative mechanism.

Original languageEnglish (US)
Pages (from-to)2730-2738
Number of pages9
JournalBrain
Volume146
Issue number7
DOIs
StatePublished - Jul 1 2023

Keywords

  • ATP5F1B
  • case report
  • dystonia
  • incomplete penetrance
  • mitochondrial ATP synthase

ASJC Scopus subject areas

  • Clinical Neurology

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