Please note that eDoc will be permanently shut down in the first quarter of 2021!      Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Quick Search
My eDoc
Session History
Support Wiki
Direct access to
document ID:

          Institute: MPI für medizinische Forschung     Collection: Abteilung Biophysik     Display Documents

ID: 565629.0, MPI für medizinische Forschung / Abteilung Biophysik
Mutations in the mitochondrial thioredoxin reductase gene TXNRD2 cause dilated cardiomyopathy
Translation of Title:Mutations in the mitochondrial thioredoxin reductase gene TXNRD2 cause dilated cardiomyopathy
Authors:Sibbing, Dirk; Pfeufer, Arne; Perisic, Tamara; Mannes, Alexander M.; Fritz−Wolf, Karin; Unwin, Sarah; Sinner, Moritz F.; Gieger, Christian; Gloeckner, Christian J.; Wichmann, Heinz−Erich; Kremmer, Elisabeth; Schäfer, Zasie; Walch, Axel; Hinterseer, Martin; Näbauer, Michael; Kääb, Stefan; Kastrati, Adnan; Schömig, Albert; Meitinger, Thomas; Bornkamm, Georg W.; Conrad, Marcus; von Beckerath, Nicolas
Date of Publication (YYYY-MM-DD):2011-01-18
Title of Journal:European Heart Journal
Journal Abbrev.:European Heart Journal
Start Page:1
End Page:13
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Aims Cardiac energy requirement is met to a large extent by oxidative phosphorylation in mitochondria that are highly abundant in cardiac myocytes. Human mitochondrial thioredoxin reductase (TXNRD2) is a selenocysteine−containing enzyme essential for mitochondrial oxygen radical scavenging. Cardiac−specific deletion of Txnrd2 in mice results in dilated cardiomyopathy (DCM). The aim of this study was to investigate whether TXNRD2 mutations explain a fraction of monogenic DCM cases.

Methods and results Sequencing and subsequent genotyping of TXNRD2 in patients diagnosed with DCM (n = 227) and in DCM−free (n = 683) individuals from the general population sample KORA S4 was performed. The functional impact of observed mutations on Txnrd2 function was tested in mouse fibroblasts. We identified two novel amino acid residue−altering TXNRD2 mutations [175G > A (Ala59Thr) and 1124G > A (Gly375Arg)] in three heterozygous carriers among 227 patients that were not observed in the 683 DCM−free individuals. Both DCM−associated mutations result in amino acid substitutions of highly conserved residues in helices contributing to the flavin−adenine dinucleotide (FAD)−binding domain of TXNRD2. Functional analysis of both mutations in Txnrd2−/− mouse fibroblasts revealed that contrasting to wild−type (wt) Txnrd2, neither mutant did restore Txnrd2 function. Mutants even impaired the survival of Txnrd2 wt cells under oxidative stress by a dominant−negative mechanism.

Conclusion For the first time, we describe mutations in DCM patients in a gene involved in the regulation of cellular redox state. TXNRD2 mutations may explain a fraction of human DCM disease burden
Free Keywords:Dilated cardiomyopathy ; Genetics ; TXNRD2
Last Change of the Resource (YYYY-MM-DD):--
External Publication Status:published
Document Type:Article
Communicated by:Wulf Kaiser
Affiliations:MPI für medizinische Forschung/Abteilung Biophysik
MPI für medizinische Forschung/Abteilung Biomolekulare Mechanismen
Full Text:
Sorry, no privileges
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.