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

Dong-Kun Yang; Ha-Hyun Kim; Siu Lee; Jae-Young Yoo

doi:10.4142/jvs.2020.21.e22

Journal List > J Vet Sci > v.21(2) > 1144497

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Yang, Kim, Lee, and Yoo: Establishment of multiplex RT-PCR for differentiation between rabies virus with and that without mutation at position 333 of glycoprotein

Original Article

J Vet Sci 2020;21(2):e22.

Published online: 4 March 2020

DOI: https://doi.org/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

Dong-Kun Yang^*, Ha-Hyun Kim, Siu Lee, Jae-Young Yoo

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

^*Corresponding author: Dong-Kun Yang OIE Reference Laboratory for Rabies, Viral Disease Research Division, Animal and Plant Quarantine Agency, 177 Hyeoksin 8-ro, Gimcheon 39660, Korea. E-mail: yangdk@korea.kr

Conflict of Interest The authors declare no conflicts of interest.

Received 3 May 2019 Revised 19 August 2019 Accepted 30 December 2019

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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 FAID₅₀/reaction for the ERAGS and Evelyn-Rokitnicki-Abelseth strains, respectively. No cross-reactions 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.

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Keywords: Rabies virus, RT-PCR, detection

References

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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.

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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.

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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.

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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.

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Table 1.

Two specific primer sets for differentiation between ERAGS and fixed strains by multiplex reverse transcription polymerase chain reaction

Designation	Oligonucleotide	Expected size (bp)	Target gene	Remarks
RABVcomF	CCCTCCTY^* CAGCAACATATGGAG	383	G	All RABV
RABVcomR	TCACAGTCTGGTCTCACCR^* CC
ERAGS-F	ACCAGACAAGCTTGGTCCCTGG	583	G	ERAGS only
ERAGS-R	GGA^† TGCTCTCTTCCCTCTACTGGA

^* Y: C or T; R: A or G;

^† GGA: nucleotide sequence of glutamine at position 333 of the G protein.

Table 2.

Infectivity titer equivalent of multiplex RT-PCR for detection of rabies virus

Virus dilution	Infectivity titer equivalent^*	Multiplex RT-PCR result
Virus dilution	Infectivity titer equivalent^*	ERAGS/ERA (583/383 bp)	ERA (583/383 bp)
10⁰	80,000	+/+	−/+
10⁻¹	8,000	+/+	−/+
10⁻²	800	+/+	−/+
10⁻³	80	+/+	−/+
10⁻⁴	8	−/+	−/+
10⁻⁵	0.8	−/−	−/−
10⁻⁶	0.08	−/−	−/−
10⁻⁷	0.008	−/−	−/−

RT-PCR, reverse transcription polymerase chain reaction; ERA, Evelyn-Rokitnicki-Abelseth.

^* FAID₅₀/2 µL one-step multiplex RT-PCR reaction. Aliquots of 200 µL of the ERAGS and ERA strains with a viral titer of 107.0 FAID₅₀/mL were used for RNA extraction.

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