Abstract
Recent studies have detected erythrovirus genomes in the hearts of cardiomyopathy and cardiac transplant patients. Assessment of the functional status of viruses may provide clinically important information beyond detection of the viral genomes. Here, we report transcriptional activation of cardiotropic erythrovirus to be associated with strongly altered myocardial gene expression in a distinct subgroup of cardiomyopathy patients. Endomyocardial biopsies (EMBs) from 415 consecutive cardiac erythrovirus (B19V)-positive patients with clinically suspected cardiomyopathy were screened for virus-encoded VP1/VP2 mRNA indicating transcriptional activation of the virus, and correlated with cardiac host gene expression patterns in transcriptionally active versus latent infections, and in virus-free control hearts. Transcriptional activity was detected in baseline biopsies of only 66/415 patients (15.9 %) harbouring erythrovirus. At the molecular level, significant differences between cardiac B19V-positive patients with transcriptionally active versus latent virus were revealed by expression profiling of EMBs. Importantly, latent B19V infection was indistinguishable from controls. Genes involved encode proteins of antiviral immune response, B19V receptor complex, and mitochondrial energy metabolism. Thus, functional mapping of erythrovirus allows definition of a subgroup of B19V-infected cardiomyopathy patients characterized by virus-encoded VP1/VP2 transcripts and anomalous host myocardial transcriptomes. Cardiac B19V reactivation from latency, as reported here for the first time, is a key factor required for erythrovirus to induce altered cardiac gene expression in a subgroup of cardiomyopathy patients. Virus genome detection is insufficient to assess pathogenic potential, but additional transcriptional mapping should be incorporated into future pathogenetic and therapeutic studies both in cardiology and transplantation medicine.
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Abbreviations
- ADV:
-
Adenovirus
- ARB:
-
Angiotensin receptor blocker
- B19V:
-
Erythrovirus/parvovirus B19
- DCM:
-
Dilated cardiomyopathy
- EMB:
-
Endomyocardial biopsy
- EPC:
-
Endothelial progenitor cell
- ES:
-
Mitral valve E-point to septal separation
- EV:
-
Enterovirus
- FS:
-
Fractional shortening
- HHV-6:
-
Human herpesvirus type 6
- ICD:
-
Imlantable cadioverter defibrillator
- LVBB:
-
Left ventricular branch block
- LVEDD:
-
Left ventricular enddiastolic diameter
- LVEF:
-
Left ventricular ejection fraction
- LVESD:
-
Left ventricular endsystolic diameter
- MI:
-
Myocardial infarction
- PCR:
-
Polymerase chain reaction
- PM:
-
Pacemaker
- RT-QPCR:
-
Reverse transcription quantitative PCR
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Acknowledgments
This work was supported by grants from the German Research Foundation (DFG) via Collaborative Research Centre SFB/TR 19 “Inflammatory Cardiomyopathy—Molecular Pathogenesis and Therapy”, and by the German Federal Ministry of Education and Research (BMBF) via KMU Innovative program (No. 616 0315296). For their excellent technical assistance we thank Ms. K. Winter, S. Ochmann, C. Seifert, M. Willner, and A. Kallel, Berlin, Germany.
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U. Kühl, D. Lassner, H.-P. Schultheiss and W. Poller are contributing equally to this paper.
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395_2013_372_MOESM1_ESM.docx
Supplemental Figure 1 Panel A: Agarose gel analysis of PCR products obtained after various enzymatic pre-treatments of nucleic acids isolated from endomyocardial patient biopsies. Without DNAse digestion, a PCR product is expectedly generated from the single-stranded B19V genomic DNA contained in the biopsies (lanes 3-5). After extensive DNAse treatment of isolated nucleic acids, as used throughout the current study, no PCR could be obtained any more without reverse transcription (RT) before the PCR for VP1/VP2 sequence was conducted (lanes 6-8), indicating efficient removal of any residual viral genomic DNA. After the DNAs digestion, a PCR product was only generated if a RT reaction was conducted before the PCR (lanes 6-8, 11, 12). Panel B: In the RT-QPCR protocol used throughout this study for the quantification of viral sequences, there was also no signal after DNAse digestion without reverse transcription prior to quantitative PCR (lanes 2, 3, 5, 8). Quality controls as shown here in two patients (# 3512 for 2 biopsies, and #7806) were conducted for all patients investigated, and complete removal of viral genomic DNA by DNAse treatment before RT-qPCR was confirmed in all cases. The viral mRNA-derived quantitative signals as exemplified by lanes 4, 6, and 9 appear only after a reverse transcription (RT) before qPCR. (DOCX 823 kb)
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Kuhl, U., Lassner, D., Dorner, A. et al. A distinct subgroup of cardiomyopathy patients characterized by transcriptionally active cardiotropic erythrovirus and altered cardiac gene expression. Basic Res Cardiol 108, 372 (2013). https://doi.org/10.1007/s00395-013-0372-y
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DOI: https://doi.org/10.1007/s00395-013-0372-y