Mitochondrial dynamics variation portal: the locus-specific databases portal of genes involved in mitochondrial dynamics
Pathogenic variants of the aconitase 2 gene (ACO2MIM# 100850) are responsible for a broad clinical spectrum involving optic nerve degeneration, ranging from isolated optic neuropathy with recessive or dominant inheritance, to complex neurodegenerative syndromes with recessive transmission.
Reference: 
Guehlouz K, Foulonneau T, Amati-Bonneau P, et al. Under submission.
Mutations in the optic atrophy 1 gene (OPA1; MIM# 605290) are responsible for about 60-80% of the cases of autosomal dominant optic atrophy (DOA, Kjer type; MIM# 165500; characterized by moderate to severe loss of visual acuity, blue-yellow dyschromatopsia and central scotoma). The spectrum of OPA1-related disorders is highly variable. The age of onset varies from birth to over 60 years, and the severity of the visual loss ranges from subclinical loss to severe blindness. Extra ocular features, involving the central, peripheral and autonomous nervous systems, complicating the optic neuropathy are reported in about 20% of the patients carrying OPA1 pathogenic variants, leading to conditions described as the "DOA plus" or "DOA+" syndromes (MIM# 125250). A phenotype fully compatible with the Behr syndrome (MIM# 210000), associating early onset and severe optic neuropathy with spinocerebellar ataxia and retarded development was also reported.
References: 
Ferre M, Amati-Bonneau P, Tourmen Y, Malthiery Y, Reynier P. eOPA1: an online database for OPA1 mutations. Hum Mutat 2005;25(5):423-8. DOI: 10.1002/humu.20161.
Ferre M, Caignard A, Milea D, et al. Improved locus-specific database for OPA1 mutations allows inclusion of advanced clinical data. Hum Mutat 2015;36(1):20-5. DOI: 10.1002/humu.22703. DOI: 10.1002/humu.22703.
Le Roux B, Lenaers G, Zanlonghi X, et al. OPA1: 516 unique variants and 831 patients registered in an updated centralized Variome database. Orphanet J Rare Dis 2019;14(1):214. DOI: 10.1186/s13023-019-1187-1.
About us
We are an academic research team of the Mitovasc - CNRS 6015/Inserm 1083 research unit specialized in disorders involving mitochondrial dynamics and bioenergetics, headed by Dr. Daniel Henrion. Our main building is located in Angers, France, at the edges of the River Maine.
Who supports us
In France, academic research can have multiple affiliations. Here are ours: CNRS (National Center for Scientific Research), a government-funded research organization, under the administrative authority of France’s Ministry of Research; Inserm (French National Institute of Health and Medical Research), a public scientific and technological institute which operates under the joint authority of the French Ministry of Health and French Ministry of Research; University Hospital of Angers, that provide clinical education and training to future and current doctors, nurses, and other health professionals, in addition to delivering medical care to patients; University of Angers, committed to seeking continual improvement in teaching methods,  and new technologies play a key role.
We bring positive and energetic relationships with the patients’ associations. We are grateful to (by alphabetic order): Association contre les Maladies Mitochondriales, Fondation VisioKjer FranceOuvrir les Yeux, Retina France and Union Nationale des Aveugles et Déficients Visuels.