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Eur J Hum Genet. 2014 Jul;22(7):902-6. doi: 10.1038/ejhg.2013.269. Epub 2013 Nov 27.

Deleterious mutation in FDX1L gene is associated with a novel mitochondrial muscle myopathy.

Author information

1
1] Department of Pediatric A', Emek Medical Center, Afula, Rappaport School of Medicine, Technion, Haifa, Israel [2] Genetic Institute, Emek Medical Center, Afula, Rappaport School of Medicine, Technion, Haifa, Israel.
2
Monique and Jacques Roboh Department of Genetic Research, Hadassah, Hebrew University Medical Center, Jerusalem, Israel.
3
Department of Immunology, Genetics and Pathology, Science for Life Laboratory Uppsala, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden.
4
Department of Pediatric A', Emek Medical Center, Afula, Rappaport School of Medicine, Technion, Haifa, Israel.
5
Genetic Institute, Emek Medical Center, Afula, Rappaport School of Medicine, Technion, Haifa, Israel.

Abstract

Isolated metabolic myopathies encompass a heterogeneous group of disorders, with mitochondrial myopathies being a subgroup, with depleted skeletal muscle energy production manifesting either by recurrent episodes of myoglobinuria or progressive muscle weakness. In this study, we investigated the genetic cause of a patient from a consanguineous family who presented with adolescent onset autosomal recessive mitochondrial myopathy. Analysis of enzyme activities of the five respiratory chain complexes in our patients' skeletal muscle showed severely impaired activities of iron sulfur (Fe-S)-dependent complexes I, II and III and mitochondrial aconitase. We employed exome sequencing combined with homozygosity mapping to identify a homozygous mutation, c.1A>T, in the FDX1L gene, which encodes the mitochondrial ferredoxin 2 (Fdx2) protein. The mutation disrupts the ATG initiation translation site resulting in severe reduction of Fdx2 content in the patient muscle and fibroblasts mitochondria. Fdx2 is the second component of the Fe-S cluster biogenesis machinery, the first being IscU that is associated with isolated mitochondrial myopathy. We suggest adding genetic analysis of FDX1L in cases of mitochondrial myopathy especially when associated with reduced activity of the respiratory chain complexes I, II and III.

PMID:
24281368
PMCID:
PMC4060119
DOI:
10.1038/ejhg.2013.269
[Indexed for MEDLINE]
Free PMC Article

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