Journal of Medical Biochemistry (Jan 2016)

Analysis of the variability of Epstein-Barr virus genes in infectious mononucleosis: Investigation of the potential correlation with biochemical parameters of hepatic involvement

  • Banko Ana,
  • Lazarević Ivana,
  • Stevanović Goran,
  • Ćirković Anđa,
  • Karalić Danijela,
  • Ćupić Maja,
  • Banko Bojan,
  • Milovanović Jovica,
  • Jovanović Tanja

Journal volume & issue
Vol. 35, no. 3
pp. 337 – 346

Abstract

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Background: Primary Epstein-Barr virus (EBV) infection is usually asymptomatic, although at times it results in the benign lymphoproliferative disease, infectious mononucleosis (IM), during which almost half of patients develop hepatitis. The aims of the present study are to evaluate polymorphisms of EBV genes circulating in IM isolates from this geographic region and to investigate the correlation of viral sequence patterns with the available IM biochemical parameters. Methods: The study included plasma samples from 128 IM patients. The genes EBNA2, LM P1, and EBNA1 were amplified using nested-PCR. EBNA2 genotyping was performed by visualization of PCR products using gel electrophoresis. Investigation of LM P1 and EBNA1 included sequence, phylogenetic, and statistical analyses. Results: The presence of EBV DNA in plasma samples showed correlation with patients' necessity for hospitalization (p= 0.034). The majority of EBV isolates was genotype 1. LMP1 variability showed 4 known variants, and two new deletions (27-bp and 147-bp). Of the 3 analyzed attributes of LM P1 isolates, the number of 33-bp repeats less than the reference 4.5 was the only one that absolutely correlated with the elevated levels of transaminases. EBNA1 variability was presented by prototype subtypes. A particular combination of EBNA2, LM P1, and EBNA1 polymorphisms, deleted LM PI/P-thr and non-deleted LMp1/P-ala, as well as genotype 1/ 4 .5 33-bp LM P1 repeats or genotype 2 / 4 .5 33-bp LM P1 repeats showed correlation with elevated AST (aspartate aminotransferase) and ALT (alanine transaminase). Conclusions: This is the first study which identified the association between EBV variability and biochemical parameters in IM patients. These results showed a possibility for the identification of hepatic related diagnostic EBV markers.

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