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Ferrer-Cortès X, Narbona J, Bujan N, Matalonga L, Del Toro M, Arranz JA, Riudor E, Garcia-Cazorla A, Jou C, O'Callaghan M, Pineda M, Montero R, Arias A, García-Villoria J, Alston CL, Taylor RW, Briones P, Ribes A, Tort F. A leaky splicing mutation in NFU1 is associated with a particular biochemical phenotype. Consequences for the diagnosis. Mitochondrion 2015; 26:72-80. [PMID: 26688339 DOI: 10.1016/j.mito.2015.12.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 10/13/2015] [Accepted: 12/10/2015] [Indexed: 10/22/2022]
Abstract
Mutations in NFU1 were recently identified in patients with fatal encephalopathy. NFU1 is an iron-sulfur cluster protein necessary for the activity of the mitochondrial respiratory chain complexes I-II and the synthesis of lipoic acid. We report two NFU1 compound heterozygous individuals with normal complex I and lipoic acid-dependent enzymatic activities and low, but detectable, levels of lipoylated proteins. We demonstrated a leaky splicing regulation due to a splice site mutation (c.545+5G>A) that produces small amounts of wild type NFU1 mRNA that might result in enough protein to partially lipoylate and restore the activity of lipoic acid-dependent enzymes and the assembly and activity of complex I. These results allowed us to gain insights into the molecular basis underlying this disease and should be considered for the diagnosis of NFU1 patients.
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Affiliation(s)
| | - Juan Narbona
- Clinica Universitária de Navarra, Facultad Medicina, Pamplona, Spain
| | - Núria Bujan
- Hospital Clínic, IDIBAPS, CIBERER, Barcelona, Spain
| | | | | | | | | | | | - Cristina Jou
- Hospital Sant Joan de Deu, CIBERER, Barcelona, Spain
| | | | - Mercé Pineda
- Hospital Sant Joan de Deu, CIBERER, Barcelona, Spain
| | | | - Angela Arias
- Hospital Clínic, IDIBAPS, CIBERER, Barcelona, Spain
| | | | - Charlotte L Alston
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Robert W Taylor
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Paz Briones
- Hospital Clínic, IDIBAPS, CIBERER, Barcelona, Spain; CSIC, Barcelona, Spain
| | - Antonia Ribes
- Hospital Clínic, IDIBAPS, CIBERER, Barcelona, Spain.
| | - Frederic Tort
- Hospital Clínic, IDIBAPS, CIBERER, Barcelona, Spain.
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Snigdha S, de Rivera C, Milgram NW, Cotman CW. Effect of mitochondrial cofactors and antioxidants supplementation on cognition in the aged canine. Neurobiol Aging 2015; 37:171-178. [PMID: 26481404 DOI: 10.1016/j.neurobiolaging.2015.09.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 09/16/2015] [Accepted: 09/19/2015] [Indexed: 01/08/2023]
Abstract
A growing body of research has focused on modifiable risk factors for prevention and attenuation of cognitive decline in aging. This has led to an unprecedented interest in the relationship between diet and cognitive function. Several preclinical and epidemiologic studies suggest that dietary intervention can be used to improve cognitive function but randomized controlled trials are increasingly failing to replicate these findings. Here, we use a canine model of aging to evaluate the effects of specific components of diet supplementation which contain both antioxidants and a combination of mitochondrial cofactors (lipoic acid [LA] and acetyl-l-carnitine) on a battery of cognitive functions. Our data suggest that supplementation with mitochondrial cofactors, but not LA or antioxidant alone, selectively improve long-term recall in aged canines. Furthermore, we found evidence that LA alone could have cognitive impairing effects. These results contrast to those of a previous longitudinal study in aged canine. Our data demonstrate that one reason for this difference may be the nutritional status of animals at baseline for the 2 studies. Overall, this study suggests that social, cognitive, and physical activity together with optimal dietary intake (rather than diet alone) promotes successful brain aging.
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Affiliation(s)
- Shikha Snigdha
- Institute for Memory Impairments and Neurological Disorders, University of California-Irvine, Irvine, CA, USA.
| | | | | | - Carl W Cotman
- Institute for Memory Impairments and Neurological Disorders, University of California-Irvine, Irvine, CA, USA
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