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Journal of Virology, June 2003, p. 6546-6550, Vol. 77, No. 11
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.11.6546-6550.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Multiple Epstein-Barr Virus Infections in Healthy Individuals

Dennis M. Walling,1,2* Abigail L. Brown,1 Wiguins Etienne,1 Wendy A. Keitel,3,4 and Paul D. Ling4

Division of Infectious Diseases, Department of Internal Medicine,1 Department of Microbiology and Immunology, University of Texas Medical Branch at Galveston, Galveston,2 Department of Medicine,3 Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas4

Received 2 December 2002/ Accepted 7 March 2003


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ABSTRACT
 
We employed a newly developed genotyping technique with direct representational detection of LMP-1 gene sequences to study the molecular epidemiology of Epstein-Barr virus (EBV) infection in healthy individuals. Infections with up to five different EBV genotypes were found in two of nine individuals studied. These results support the hypothesis that multiple EBV infections of healthy individuals are common. The implications for the development of an EBV vaccine are discussed.


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TEXT
 
Multiple Epstein-Barr virus (EBV) infections are common among immunocompromised individuals (21, 29, 31, 39, 41, 43, 44, 46), but the origin of the multiple EBV strains remains a mystery. Multiple EBV strains could accumulate as superinfections in individuals who have lost previous protective immunity to EBV. Alternatively, they could represent the reactivation of latent EBV strains that were acquired prior to the onset of immunodeficiency. The reported prevalence of multiple EBV infections in healthy individuals ranges broadly between 0 and 100% (Table 1) (4, 7, 13, 16, 19, 20, 23, 30, 32, 35, 38, 45; M. L. Lung and R. S. Chang, Letter, J. Infect. Dis. 162:994-995, 1990), but differences among these studies in the molecular detection and definition of an EBV strain confound the interpretation of their results.


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  		TABLE 1. Literature review of multiple EBV infections in healthy individuals

Molecular epidemiologic studies requiring EBV isolation by B-lymphocyte transformation (16, 19, 23, 45; Lung and Chang, letter) suffer from selection bias toward transformation-competent EBV isolates (10, 27, 33). PCR amplification directly detects the EBV genome and avoids transformation selection bias, but the genetic definition of an EBV strain has been inconsistent across studies. Restriction fragment length polymorphisms detect either point mutations within restriction enzyme cleavage sites or variations of large repetitive regions within genome fragments (19, 23, 35; Lung and Chang, letter). Similarly, size variation in EBNA proteins ("EBNotype" or "EBNAprint") (16, 45) and size variation in specific gene PCR products (LMP-1, BZLF1, EBNA-6) (13, 35) reflect variations in repetitive and other genome sequences. However, many EBV genome sequences are susceptible to intrastrain homologous and nonhomologous recombination during productive replication and the number of repeat units present may vary in different isolates of the same EBV strain (12, 38, 41-43). Studies examining the major sequence divergence between EBV types 1 and 2 have reported EBV coinfection rates ranging from 0 to 53% (4, 13, 20, 34, 35, 45). However, EBV types 1 and 2 can both be further subdivided into different strains (1, 24, 41) and only three studies to date have utilized EBV gene nucleotide sequence variation to define EBV strains in healthy individuals (7, 30, 38).

EBV genotyping assay. A consistent approach is needed for the definition and nomenclature of EBV genomes. It is impractical or even impossible to physically isolate (culture) and fully characterize the EBV genome(s) in clinical infections. A reasonable goal would be to identify an EBV genetic marker that represents the broadest range of natural genetic heterogeneity while still distinguishing between evolutionarily stable genetic entities. In this context, the word "genotype" may be preferable to either "type" or "strain" to refer to a specific EBV genome that is capable of independently infecting a human host. Derivative entities arising from the originally infecting EBV genome through intrahost evolutionary genetic changes could be termed "substrains" or "variants."

We have developed a highly sensitive and specific EBV genotyping technique based upon patterns of sequence variation in the EBV LMP-1 gene (43) that offers distinct advantages over previous molecular epidemiologic approaches. First, multiple EBV sequences are identified in a single tissue specimen by direct representational detection, thereby avoiding culture selection bias. Second, EBV genotypes are precisely defined at a single polymorphic genetic locus, based upon evolutionarily stable gene sequence patterns (11, 24, 43). Finally, this technique distinguishes between independent EBV infection events and intrahost EBV evolution, including point mutation and homologous and nonhomologous recombination events that may occur in the context of an LMP-1 sequence pattern (43).

(This work was presented in part at the Tenth Biennial Meeting of the International Association for Research on Epstein-Barr Virus and Associated Diseases, Cairns, Australia, July 2002.)

Nested PCR amplification of EBV LMP-1 gene sequences was achieved with primer set 1, 5'-AGTCATAGTAGCTTAGCTGAA-3' (EBV coordinates 168160 to 168182) and 5'-CCATGGACAACGACACAGT-3' (EBV coordinates 168763 to 168745), followed by primer set 2, 5'-AGTCATAGTAGCTTAGCTGAA-3' (EBV coordinates 168160 to 168182) and 5'-CAGTGATGAACACCACCACG-3' (EBV coordinates 168748 to 168729). The limit of detection of this LMP-1 gene nested PCR amplification was approximately 10 EBV genome copies per reaction, as determined by quantitative competitive PCR testing (unpublished data). PCR products visible on an ethidium bromide-stained agarose gel were cloned, and the LMP-1 sequence was determined for at least 8 to 10 clones from each specimen as previously described (43). The LMP-1 sequence patterns used to identify EBV genotypes are summarized in Fig. 1.



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  		FIG. 1. Defined sequence patterns in the carboxy terminus of the EBV LMP-1 gene are used to identify EBV genotypes. Each EBV genotype present represents an independent EBV infection of the host and has been validated for the multiple EBV infections and intrahost EBV evolutionary events that characterize individuals with human immunodeficiency virus and AIDS (43). Intrahost evolution of a previously infecting EBV genotype is recognizable as such and does not result in a change of genotype identity. (A) Fourteen numbered sequence patterns represent the region downstream of the 11-amino-acid repeat region of LMP-1. (B) Eleven-lettered sequence patterns represent the region upstream of the 11-amino-acid repeat region of LMP-1. All 25 sequence patterns represent EBV LMP-1 sequences identified in at least three different individuals and from at least two different geographic locations. EBV genotypes are named based upon the combination of the downstream and upstream patterns present conjointly in the LMP-1 gene (for example, 2a-F1). Symbols: dot, amino acid identity with pattern B958(a); *, synonymous nucleotide substitution; -, amino acid codon deletion. Amino acids are numbered on the basis of the LMP-1 gene of the lymphoblastoid cell line isolate B958.

This genotyping assay was tested to determine its ability to detect relative quantities of different coinfecting EBV genotypes. Two different clones of known different LMP-1 sequences (clones A and B) were mixed in vitro in various ratios ranging from 1:1 to 1:300. For each ratio combination, nested PCR amplification was performed by using 105 molecules of target LMP-1 sequence diluted into 1.0 µg of human genomic DNA. All PCR products were cloned. For each original ratio combination, the identity of multiple resultant clones was determined as matching the original clone A or clone B sequences. The ratios of the resultant clone sequences closely resembled the original sequence ratios before PCR (Table 2), suggesting that sequencing 8 to 10 clones per specimen is sufficient to detect all coinfecting EBV genotypes present in vivo at relative ratios of 1:10 or less.


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  		TABLE 2. LMP-1 genotype sequence ratios before and after PCR and cloning

EBV quantitation in healthy individuals. Saliva and peripheral blood mononuclear cells from nine individuals were nonrandomly selected (based on detection of EBV in saliva for eight of the nine subjects and on the absence of EBV in the saliva for the remaining subject) from a cohort of 30 healthy human research subject volunteers enrolled in a long-term, prospective study of virus reactivation and shedding (22). Quantitative measurement of the EBV in each of 28 pairs of saliva and blood specimens was accomplished by real-time quantitative PCR of the EBER gene (Table 3) as previously described (28). EBV was detected in 25 of 28 saliva specimens by EBER PCR, and detectable quantities ranged from 6 to 2,220,000 EBV genome copies per 0.5 µg of DNA (Table 3). For subjects 2 and 4, the quantity of EBV detected in the saliva was remarkably high, approaching 30 EBV genomes per cell equivalent, a range similar to levels of productive EBV replication in oral hairy leukoplakia (15, 40).


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  		TABLE 3. Molecular epidemiology of EBV infection in healthy individuals

EBV was detected in 3 of 28 blood specimens by EBER PCR, and detectable quantities ranged from 13 to 80 EBV genome copies per 0.5 µg of DNA (Table 3). Previous studies have indicated that healthy individuals carry EBV in the peripheral blood at 1 to 63 EBV genome copies per 106 B lymphocytes (25, 37). This quantity is at or below the limit of detection for this assay using up to 0.75 x 105 blood mononuclear cell genome equivalents of DNA per reaction.

Multiple EBV infections in healthy individuals. In this pilot study, we tested the hypothesis that healthy individuals harbor infections with multiple LMP-1-defined EBV genotypes, representative of multiple independent EBV infections. We determined that an individual study subject harbored multiple EBV infections when one or more of the following three criteria were met: (i) two or more EBV genotypes are present in a single saliva or blood specimen; (ii) different EBV genotypes are present among simultaneously collected saliva and blood specimens from the same individual; (iii) temporal changes in the EBV genotype are present in sequentially collected saliva or blood specimens from the same individual.

Single-genotype EBV infection was identified in seven of the nine subjects, including five subjects that had a single EBV genotype repeatedly detected in saliva at multiple time points over periods of up to 4 months (Table 3). Two subjects were found to harbor multiple EBV infections (Table 3). Subject 3 harbored different EBV genotypes among simultaneously collected saliva and blood specimens at two different time points. Additionally, subject 3 exhibited temporal changes in the EBV genotypes present in sequentially collected saliva and blood specimens. In total, four different EBV genotypes were detected for subject 3 over a period of 2 months, with at least two detectable genotypes simultaneously infecting this subject at two separate time points. Subject 9 harbored two or more EBV genotypes present in four different saliva and blood specimens. Additionally, subject 9 harbored different EBV genotypes between simultaneously collected saliva and blood specimens at two different time points. Finally, subject 9 also exhibited temporal changes in the EBV genotypes present in sequentially collected saliva and blood specimens. In total, five different EBV genotypes were identified for subject 9 over a period of 8 months, with up to four detectable genotypes simultaneously infecting this subject at any single point in time.

Our data demonstrated multiple EBV infections in two of nine subjects. This prevalence rate of 22% is very close to the mean prevalence rate of 23% calculated from the pooled data (Table 1). However, the limitations of this study (small sample size, nonrandom selection, short duration, and low success rate for blood specimens) could tend to either underestimate or overestimate the true prevalence of multiple EBV infections. A large, well-designed, EBV LMP-1 genotyping study is warranted in order to accurately determine the prevalence of multiple EBV infection in healthy individuals.

Immunocompromised individuals routinely exhibit high-level oral EBV shedding (2, 14), coinfection with multiple EBV genotypes (39, 41, 43), and temporal changes in EBV populations (26, 31). Yet, even among this small sample of nine healthy individuals, we found examples of high salivary levels of EBV, infection with up to five different EBV genotypes, and temporal changes in the EBV populations in saliva and blood. The different magnitude, yet similar nature, of the EBV behavior in immunocompromised and in healthy individuals suggests that acquired immunodeficiency simply unmasks or exaggerates intrinsic aspects of the normal EBV-host relationship. More-frequent reactivations and higher levels of replication in immunocompromised individuals allow preexisting multiple EBV infections to be detected more easily.

If multiple EBV infections are common in healthy individuals, then the temporal nature of acquisition of these multiple infections remains to be determined. It is possible that multiple EBV genotypes are simultaneously acquired during primary EBV infection, through exposure to an individual (such as subject 9) who is orally shedding multiple EBV genotypes. In this single-event hypothesis, all of the coinfecting genotypes would simultaneously establish persistent latent infection prior to the development of EBV-specific immunity in the host. Once developed, host immunity may prevent further EBV superinfection.

Alternatively, it is possible that multiple EBV genotypes are sequentially acquired as successive superinfections from multiple exposures over the lifetime of the host. In this accumulation hypothesis, immunity to EBV that developed after primary infection may not protect the host against exogenous EBV superinfection. Each successively encountered genotype may establish persistent latent infection despite preexisting host immunity to EBV. This hypothesis is supported by molecular epidemiologic data from another human herpesvirus. Healthy individuals previously infected with cytomegalovirus are susceptible to superinfection with additional, genetically different cytomegalovirus strains (5, 6, 8).

The relationship between EBV infection and host immune response must be understood before designing an EBV vaccine. If natural EBV infection does not protect against subsequent EBV superinfection with a different genotype, then the goal of an EBV vaccine to prevent wild-type EBV infection may not be achievable. However, natural infection with EBV early in life appears to protect against later developing the infectious mononucleosis syndrome (17, 18, 36). A vaccination that induces an immunity similar to that obtained by wild-type infection may protect against developing the infectious mononucleosis syndrome if wild-type EBV infection does subsequently occur. The precedent for this concept has been established with another human herpesvirus. Vaccination with live, attenuated varicella-zoster virus does not prevent wild-type varicella-zoster virus superinfection but does prevent or greatly attenuate the clinical syndrome of chickenpox (3, 9).


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ACKNOWLEDGMENTS
 
This work was supported by a Public Health Service grant to Dennis M. Walling (NIH R01-DE12323) and a cooperative agreement NCC 9-58 with the National Space Biomedical Research Institute.


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FOOTNOTES
 
* Corresponding author. Mailing address: Division of Infectious Diseases, Department of Internal Medicine, The University of Texas Medical Branch at Galveston, 301 University Blvd., Galveston, TX 77555-0435. Phone: (409) 747-2361. Fax: (409) 772-6527. E-mail: dwalling{at}utmb.edu. Back


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Journal of Virology, June 2003, p. 6546-6550, Vol. 77, No. 11
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.11.6546-6550.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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