Abstract:
:Many individuals with abnormalities of mitochondrial respiratory chain complex III remain genetically undefined. Here, we report mutations (c.288G>T [p.Trp96Cys] and c.643C>T [p.Leu215Phe]) in CYC1, encoding the cytochrome c1 subunit of complex III, in two unrelated children presenting with recurrent episodes of ketoacidosis and insulin-responsive hyperglycemia. Cytochrome c1, the heme-containing component of complex III, mediates the transfer of electrons from the Rieske iron-sulfur protein to cytochrome c. Cytochrome c1 is present at reduced levels in the skeletal muscle and skin fibroblasts of affected individuals. Moreover, studies on yeast mutants and affected individuals' fibroblasts have shown that exogenous expression of wild-type CYC1 rescues complex III activity, demonstrating the deleterious effect of each mutation on cytochrome c1 stability and complex III activity.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Gaignard P,Menezes M,Schiff M,Bayot A,Rak M,Ogier de Baulny H,Su CH,Gilleron M,Lombes A,Abida H,Tzagoloff A,Riley L,Cooper ST,Mina K,Sivadorai P,Davis MR,Allcock RJ,Kresoje N,Laing NG,Thorburn DR,Slama A,Christodoi
10.1016/j.ajhg.2013.06.015subject
Has Abstractpub_date
2013-08-08 00:00:00pages
384-9issue
2eissn
0002-9297issn
1537-6605pii
S0002-9297(13)00284-Xjournal_volume
93pub_type
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