ARMC1

ARMC1 Full Name

armadillo repeat containing 1

ARMC1 Introduction

ARMC1 (armadillo repeat containing 1) is a mitochondrial-associated protein belonging to the armadillo repeat-containing (ARMC) family, a group of proteins characterized by conserved armadillo repeat domains that mediate protein–protein interactions. Unlike many well-studied mitochondrial regulators, ARMC1 has only recently emerged as an important component of mitochondrial homeostasis. Current evidence indicates that ARMC1 is localized mainly at the mitochondrial inner membrane and mitochondrial contact sites, where it participates in the mitochondrial contact site and cristae organizing system (MICOS)/mitochondrial intermembrane bridging (MIB) network. By interacting with mitochondrial proteins such as SLC25A46, ARMC1 contributes to maintaining mitochondrial architecture, cristae organization, and organelle communication. For researchers investigating mitochondrial dysfunction, ARMC1 represents a potential regulatory node connecting mitochondrial structure, protein complex assembly, and cellular energy balance.

The primary function of ARMC1 is to regulate mitochondrial dynamics and distribution through coordinated interactions with multiple mitochondrial regulatory complexes. Recent mechanistic studies have demonstrated that ARMC1 can be recruited by the mitochondrial trafficking adaptor MIRO and facilitate the assembly and stabilization of the MIRO–MTFR complex, which influences mitochondrial positioning and counteracts excessive mitochondrial retrograde movement. ARMC1 localization is dynamically controlled by interacting proteins such as DNAJC11, which promotes ARMC1 release from mitochondria and helps maintain an appropriate balance between mitochondrial-bound and cytoplasmic ARMC1 pools. Loss of ARMC1 disrupts mitochondrial distribution, leading to abnormal perinuclear mitochondrial accumulation and impaired mitochondrial homeostasis. In addition, ARMC1 has been shown to regulate mitochondrial fission and fusion balance by suppressing excessive DRP1-mediated mitochondrial fragmentation while promoting the expression of mitochondrial fusion proteins including OPA1, MFN1, and MFN2. These findings highlight ARMC1 as a critical factor in protecting cells from oxidative stress and maintaining mitochondrial functional stability.

Abnormal ARMC1 activity has been increasingly associated with diseases involving mitochondrial dysfunction, oxidative stress, and tissue degeneration. In renal fibrosis models, ARMC1 deficiency promotes mitochondrial fragmentation, reduces mitochondrial activity, and increases oxidative damage, whereas ARMC1 overexpression enhances antioxidant responses through pathways involving NRF2, SOD1/2, and CAT, thereby reducing TGF-β1-induced fibrotic injury. Mesenchymal stem cells have also been reported to alleviate renal fibrosis partly by increasing ARMC1 expression and restoring mitochondrial homeostasis. Although ARMC1 has been proposed as a potential biomarker in cancer studies, some clinical association reports require cautious interpretation due to methodological limitations and subsequent retraction of related publications. Overall, current research supports ARMC1 as a promising mitochondrial regulatory target, with potential applications in studying mitochondrial diseases, fibrosis, metabolic disorders, and therapeutic strategies aimed at restoring mitochondrial quality control.

Alternate Names for ARMC1

ARMC1; armadillo repeat containing 1; armadillo repeat-containing protein 1; Arcp; FLJ10511;

• 1.Huang Y, et al.; ARMC Subfamily: Structures, Functions, Evolutions, Interactions, and Diseases. Front Mol Biosci. 2021, 8:791597.
  2.McKenna MJ, et al.; ARMC1 partitions between distinct complexes and assembles MIRO with MTFR to control mitochondrial distribution. Sci Adv. 2025, 11(15):eadu5091.