Recurrent De Novo and Biallelic Variation of ATAD3A, Encoding a Mitochondrial Membrane Protein, Results in Distinct Neurological Syndromes

Tamar Harel, Wan Hee Yoon, Caterina Garone, Shen Gu, Zeynep Coban-Akdemir, Mohammad K. Eldomery, Jennifer E. Posey, Shalini N. Jhangiani, Jill A. Rosenfeld, Megan T. Cho, Stephanie Fox, Marjorie Withers, Stephanie M. Brooks, Theodore Chiang, Lita Duraine, Serkan Erdin, Bo Yuan, Yunru Shao, Elie Moussallem, Costanza LampertiMaria A. Donati, Joshua D. Smith, Heather M. McLaughlin, Christine M. Eng, Magdalena Walkiewicz, Fan Xia, Tommaso Pippucci, Pamela Magini, Marco Seri, Massimo Zeviani, Michio Hirano, Jill V. Hunter, Myriam Srour, Stefano Zanigni, Richard Alan Lewis, Donna M. Muzny, Timothy E. Lotze, Eric Boerwinkle, Richard A. Gibbs, Scott E. Hickey, Brett H. Graham, Yaping Yang, Daniela Buhas, Donna M. Martin, Lorraine Potocki, Claudio Graziano, Hugo J. Bellen, James R. Lupski

Research output: Contribution to journalArticle

Abstract

ATPase family AAA-domain containing protein 3A (ATAD3A) is a nuclear-encoded mitochondrial membrane protein implicated in mitochondrial dynamics, nucleoid organization, protein translation, cell growth, and cholesterol metabolism. We identified a recurrent de novo ATAD3A c.1582C>T (p.Arg528Trp) variant by whole-exome sequencing (WES) in five unrelated individuals with a core phenotype of global developmental delay, hypotonia, optic atrophy, axonal neuropathy, and hypertrophic cardiomyopathy. We also describe two families with biallelic variants in ATAD3A, including a homozygous variant in two siblings, and biallelic ATAD3A deletions mediated by nonallelic homologous recombination (NAHR) between ATAD3A and gene family members ATAD3B and ATAD3C. Tissue-specific overexpression of borR534W, the Drosophila mutation homologous to the human c.1582C>T (p.Arg528Trp) variant, resulted in a dramatic decrease in mitochondrial content, aberrant mitochondrial morphology, and increased autophagy. Homozygous null bor larvae showed a significant decrease of mitochondria, while overexpression of borWT resulted in larger, elongated mitochondria. Finally, fibroblasts of an affected individual exhibited increased mitophagy. We conclude that the p.Arg528Trp variant functions through a dominant-negative mechanism that results in small mitochondria that trigger mitophagy, resulting in a reduction in mitochondrial content. ATAD3A variation represents an additional link between mitochondrial dynamics and recognizable neurological syndromes, as seen with MFN2, OPA1, DNM1L, and STAT2 mutations.

Original languageEnglish
Pages (from-to)831-845
Number of pages15
JournalAmerican Journal of Human Genetics
Volume99
Issue number4
DOIs
Publication statusPublished - Oct 6 2016

Keywords

  • ATAD3A
  • cardiomyopathy
  • CNV
  • de novo variant
  • dominant negative
  • mitochondrial dynamics
  • neuropathy
  • optic atrophy
  • whole-exome sequencing

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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