Abstract:
:Mitochondrial DNA (mtDNA) has been suggested to drive immune system activation, but the induction of interferon signaling by mtDNA has not been demonstrated in a Mendelian mitochondrial disease. We initially ascertained two patients, one with a purely neurological phenotype and one with features suggestive of systemic sclerosis in a syndromic context, and found them both to demonstrate enhanced interferon-stimulated gene (ISG) expression in blood. We determined each to harbor a previously described de novo dominant-negative heterozygous mutation in ATAD3A, encoding ATPase family AAA domain-containing protein 3A (ATAD3A). We identified five further patients with mutations in ATAD3A and recorded up-regulated ISG expression and interferon α protein in four of them. Knockdown of ATAD3A in THP-1 cells resulted in increased interferon signaling, mediated by cyclic GMP-AMP synthase (cGAS) and stimulator of interferon genes (STING). Enhanced interferon signaling was abrogated in THP-1 cells and patient fibroblasts depleted of mtDNA. Thus, mutations in the mitochondrial membrane protein ATAD3A define a novel type I interferonopathy.
journal_name
J Exp Medjournal_title
The Journal of experimental medicineauthors
Lepelley A,Della Mina E,Van Nieuwenhove E,Waumans L,Fraitag S,Rice GI,Dhir A,Frémond ML,Rodero MP,Seabra L,Carter E,Bodemer C,Buhas D,Callewaert B,de Lonlay P,De Somer L,Dyment DA,Faes F,Grove L,Holden S,Hully M,doi
10.1084/jem.20201560subject
Has Abstractpub_date
2021-10-04 00:00:00issue
10eissn
0022-1007issn
1540-9538pii
212553journal_volume
218pub_type
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