NDUFA2 complex I mutation leads to Leigh disease.
Mitochondrial isolated complex I deficiency is the most frequently encountered OXPHOS defect. We report a patient with an isolated complex I deficiency expressed in skin fibroblasts as well as muscle tissue. Because the parents were consanguineous, we performed homozygosity mapping to identify homozygous regions containing candidate genes such as NDUFA2 on chromosome 5. Screening of this gene on genomic DNA revealed a mutation that interferes with correct splicing and results in the skipping of exon 2. Exon skipping was confirmed on the mRNA level. The mutation in this accessory subunit causes reduced activity and disturbed assembly of complex I. Furthermore, the mutation is associated with a mitochondrial depolarization. The expression and activity of complex I and the depolarization was (partially) rescued with a baculovirus system expressing the NDUFA2 gene.
Hoefs
Saskia J G
SJ
Department of Pediatrics, Nijmegen Center for Mitochondrial Disorders, Radboud University Nijmegen Medical Center, Nijmegen 6500 HB, The Netherlands.
Dieteren
Cindy E J
CE
Distelmaier
Felix
F
Janssen
Rolf J R J
RJ
Epplen
Andrea
A
Swarts
Herman G P
HG
Forkink
Marleen
M
Rodenburg
Richard J
RJ
Nijtmans
Leo G
LG
Willems
Peter H
PH
Smeitink
Jan A M
JA
van den Heuvel
Lambert P
LP
D003241:Consanguinity; D017931:DNA Primers / Q000235:genetics; D042967:Electron Transport Complex I / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D005091:Exons; D005347:Fibroblasts / Q000201:enzymology; D005816:Genetic Complementation Test; D006720:Homozygote; D006801:Humans; D007223:Infant; D007888:Leigh Disease / Q000201:enzymology* / Q000235:genetics*; D008297:Male; D008928:Mitochondria / Q000201:enzymology; D009132:Muscles / Q000201:enzymology; D009154:Mutation; D012333:RNA, Messenger / Q000235:genetics
D017931:DNA Primers; D012333:RNA, Messenger; D042967:Electron Transport Complex I