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Homozygous p.V116* mutation in C12orf65 results in Leigh syndrome
  1. Eri Imagawa1,
  2. Aviva Fattal-Valevski2,
  3. Ori Eyal3,
  4. Satoko Miyatake1,
  5. Ann Saada4,
  6. Mitsuko Nakashima1,
  7. Yoshinori Tsurusaki1,
  8. Hirotomo Saitsu1,
  9. Noriko Miyake1,
  10. Naomichi Matsumoto1
  1. 1Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
  2. 2Paediatric Neurology Unit, Tel Aviv Sourasky Medical Centre, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
  3. 3Paediatric Endocrinology Unit, Tel Aviv Sourasky Medical Centre, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
  4. 4Monique and Jacques Roboh Department of Genetic Research and the Department of Genetic and Metabolic Diseases, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
  1. Correspondence to Dr Naomichi Matsumoto, Department of Human Genetics, Yokohama City University Graduate School of Medicine, Fukuura 3-9, Kanazawa-ku, Yokohama 2360004, Japan; naomat{at}yokohama-cu.ac.jp

Abstract

Background Leigh syndrome (LS) is an early-onset progressive neurodegenerative disorder associated with mitochondrial dysfunction. LS is characterised by elevated lactate and pyruvate and bilateral symmetric hyperintense lesions in the basal ganglia, thalamus, brainstem, cerebral white matter or spinal cord on T2-weighted MRI. LS is a genetically heterogeneous disease, and to date mutations in approximately 40 genes related to mitochondrial function have been linked to the disorder.

Methods We investigated a pair of female monozygotic twins diagnosed with LS from consanguineous healthy parents of Indian origin. Their common clinical features included optic atrophy, ophthalmoplegia, spastic paraparesis and mild intellectual disability. High-blood lactate and high-intensity signal in the brainstem on T2-weighted MRI were consistent with a clinical diagnosis of LS. To identify the genetic cause of their condition, we performed whole exome sequencing.

Results We identified a homozygous nonsense mutation in C12orf65 (NM_001143905; c.346delG, p.V116*) in the affected twins. Interestingly, the identical mutation was previously reported in an Indian family with Charcot-Marie Tooth disease type 6, which displayed some overlapping clinical features with the twins.

Conclusions We demonstrate that the identical nonsense mutation in C12orf65 can result in different clinical features, suggesting the involvement of unknown modifiers.

  • MITOCHONDRIAL DISORDERS
  • NEUROGENETICS

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