J Vet Sci.  2020 Mar;21(2):e22. 10.4142/jvs.2020.21.e22.

Establishment of multiplex RT-PCR for differentiation between rabies virus with and that without mutation at position 333 of glycoprotein

Affiliations
  • 1Viral Disease Research Division, Animal and Plant Quarantine Agency, Ministry of Agriculture, Food and Rural Affairs, Gimcheon 39660, Korea

Abstract

Rabid raccoon dogs (Nyctereutes procyonoides koreensis) have been responsible for animal rabies in South Korea since the 1990s. A recombinant rabies vaccine strain, designated as ERAGS, was constructed for use as a bait vaccine. Therefore, new means of differentiating ERAGS from other rabies virus (RABV) strains will be required in biological manufacturing and diagnostic service centers. In this study, we designed two specific primer sets for differentiation between ERAGS and other RABVs based on mutation in the RABV glycoprotein gene. Polymerase chain reaction analysis of the glycoprotein gene revealed two DNA bands of 383 bp and 583 bp in the ERAGS strain but a single DNA band of 383 bp in the field strains. The detection limits of multiplex reverse transcription polymerase chain reaction (RT-PCR) were 80 and 8 FAID 50 /reaction for the ERAGS and Evelyn-Rokitnicki-Abelseth strains, respectively. No crossreactions were detected in the non-RABV reference viruses, including canine distemper virus, parvovirus, canine adenovirus type 1 and 2, and parainfluenza virus. The results of multiplex RT-PCR were 100% consistent with those of the fluorescent antibody test. Therefore, one-step multiplex RT-PCR is likely useful for differentiation between RABVs with and those without mutation at position 333 of the RABV glycoprotein gene.

Keyword

Rabies virus; RT-PCR; detection

Figure

  • Fig. 1. RABV G gene sites targeted by the primers used for differential RT-PCR. The first three nucleotides (TCC) of the ERAGS reverse primer, corresponding to codon 333 of the G gene, were not identical to those (AAT) of the Evelyn-Rokitnicki-Abelseth strain or KRVB1206 isolate.

  • Fig. 2. Sensitivity of the specific primer sets used for differential detection of ERAGS and ERA strains. M, 100 bp DNA ladder; lanes 1–8, ERAGS strain 100–10-7 (A). M, 100 bp DNA ladder; lanes 9–16, ERA strain 100–10-7 (B). ERA, Evelyn-Rokitnicki-Abelseth.

  • Fig. 3. Specificity of differential RABV RT-PCR using two primer sets. RT-PCR detected only RABVs, and no positive signals were obtained for the five canine viral pathogens. M, 100 bp DNA ladder; lane 1, canine distemper virus; lane 2, canine parainfluenza virus; lane 3, canine adenovirus type 1; lane 4, canine adenovirus type 2; lane 5, canine parvovirus; lane 6, CVS11; lane 7, Evelyn-Rokitnicki-Abelseth strain; lane 8, ERAGS strain; lane N, negative control (water only). RT-PCR, reverse transcription polymerase chain reaction.

  • Fig. 4. Application of multiplex reverse transcription polymerase chain reaction to positive (A) and negative (B) samples. M, 100 bp DNA ladder; lanes 1–6, FAT-positive samples; lane P1, CVS11; lane P2, Evelyn-Rokitnicki-Abelseth strain; lane P3, ERAGS strain; lanes 7–12, FAT-negative samples; lane N, negative control (water only). FAT, fluorescent antibody test.


Reference

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