HEAT-RESISTANT RECOMBINANT NEWCASTLE DISEASE VIRUS VACCINE STRAIN CAPABLE OF EXPRESSING TRUNCATED FIBER 2 PROTEIN OF FOWL ADENOVIRUS SEROTYPE 4, PREPARATION METHOD AND APPLICATION THEREOF

Abstract

A heat-resistant recombinant Newcastle Disease Virus vaccine strain rLS-tFib2-C capable of expressing truncated Fiber 2 protein of fowl adenovirus serotype 4 has been preserved at the China Center for Type Culture Collection, Wuhan University, Wuhan, China with the preservation number of CCTCC No. V202042.

Claims

1. A heat-resistant recombinant Newcastle Disease Virus vaccine strain rLS-tFib2-C capable of expressing truncated Fiber 2 protein of fowl adenovirus serotype 4 which has been preserved at the China Center for Type Culture Collection, Wuhan University, Wuhan, China with the preservation number of CCTCC No. V202042.

2. The heat-resistant recombinant Newcastle Disease Virus strain rLS-tFib2-C according to claim 1, wherein the rLS-tFib2-C vaccine strain is obtained by using a NDV LaSota strain as a parent strain, and replacing an HN gene of the LaSota strain with an HN gene of the NDV TS09-C strain, and then inserting a 961-1440 bp region of truncated Fiber2 gene of the Fowl Adenovirus serotype 4 between P and M genes of the parent strain in the form of a separate coding frame.

3. The heat-resistant recombinant Newcastle Disease Virus vaccine strain rLS-tFib2-C according to claim 1, wherein the HN protein gene of the NDV LaSota strain has the sequence of SEQ ID NO: 1.

4. The heat-resistant recombinant Newcastle Disease Virus vaccine strain rLS-tFib2-C according to claim 1, wherein the 961-1440 bp region of truncated Fiber2 gene of the Fowl Adenovirus serotype 4 has the sequence of SEQ ID NO: 2.

5. The heat-resistant recombinant Newcastle Disease Virus vaccine strain rLS-tFib2-C according to claim 1, wherein the rLS-tFib2-C vaccine strain has hemagglutinating activity after heat treatment at 56° C. for 120 minutes.

6-8. (canceled)

Description

DESCRIPTION OF DRAWINGS

[0009] FIG. 1 shows the construction strategy of the heat-resistant recombinant NDV vaccine strain.

[0010] FIG. 2 shows a schematic diagram of the immunogenic gene of Fowl Adenovirus serotype 4 expressed by a recombinant NDV vector.

[0011] FIG. 3 shows the survival curve of Fowl Adenovirus attack of test chicken immunized with recombinant NDV.

[0012] FIG. 4 shows the growth curve of recombinant NDV

DETAILED DESCRIPTION

[0013] The present disclosure will be further described below with reference to the figures and examples, but the content of the present disclosure is not limited to the following examples.

Example 1

[0014] Construction and Rescue of a Heat-Resistant Recombinant NDV Strain Capable of Expressing Fowl Adenovirus Serotype 4 Immunogenic Genes

[0015] A transcription plasmid of NDV LaSota strain was used as a template and reverse genetic manipulation technology was employed. Firstly an HN gene thereof was replaced with an HN gene of a heat-resistant NDV TS09-C strain, and then five Fowl Adenovirus serotype 4 immunogenic genes (complete Fiber2, three truncated Fiber2 and complete Penton) were inserted between the P and M genes of the LaSota strain genome. The specific modification strategy was shown in FIG. 1, and the sequence positions of the five inserted genes were shown in FIG. 2. The modified transcription plasmid and three helper plasmids co-transfected BHK-21 cells to obtain five recombinant NDV strains, namely rLS-Penton, rLS-Fib2, rLS-tFib2-A, rLS-tFib2-B and rLS-tFib2-C. In the above-mentioned five recombinant virus construction and rescue schemes, the remaining operations are basically the same except for the differences in the primers used to amplify the immunogenic genes of Fowl Adenovirus.

[0016] The HN protein gene of the LaSota strain has the sequence of SEQ ID NO: 1.

[0017] 1.1 HN Gene Replacement of the Transcription Plasmid of the NDV

[0018] Using a cDNA cloning plasmid of the NDV LaSota strain as a template, fragments other than HN gene were amplified by PCR. The forward primer has the sequence of SEQ ID NO: 3, and the reverse primer has the sequence of SEQ ID NO: 4. The cDNA template was digested with nuclease DpnI, and a target fragment 1 was recovered by agarose gel electrophoresis.

[0019] The HN gene is amplified by PCR using the cDNA of the heat-resistant TS09-C strain of NDV as a template. The forward primer has the sequence of SEQ ID NO: 5, and the reverse primer has the sequence of SEQ ID NO: 6. A target fragment 2 was recovered by Agarose gel electrophoresis.

[0020] The target fragment 1 and target fragment 2 were connected by In-fusion in vitro ligation kit. The ligation product was transformed into E. coli DH5a cell. The transformed product was coated with LB medium, and single colony was selected and cultured in liquid medium. The HN gene was amplified by PCR for identification positive plasmid, and the positive plasmid was extracted for sequencing analysis of the whole plasmid. The plasmid with correct sequencing was named pTS-HN.

[0021] 1.2 Insertion of Fowl Adenovirus Serotype 4 Immunogenic Gene to Transcription Plasmid of NDV

[0022] Using the recombinant NDV plasmid pTS-HN as the template and the P and M intergenic regions as the starting point, the full length of the cDNA cloned plasmid of the rTS-HN strain was amplified by PCR. The forward primer has the sequence of SEQ ID NO: 7, and the reverse primer has the sequence of SEQ ID NO: 8. After the amplification was completed, the plasmid template was digested with nuclease DpnI, and a target fragment 3 was recovered by Agarose gel electrophoresis.

[0023] Using the genomic DNA of the FAdV-4 HB1510 isolate as a template, a fragment of the region 961-1440 of the Fiber 2 gene (tFib2/C) is amplified by PCR. The forward primer has the sequence of SEQ ID NO: 9, and the reverse primer has the sequence of SEQ ID NO: 10. A target fragment 4 was recovered by agarose gel electrophoresis. The primers were added with the gene start motif, gene stop motif, translation Kozak motif, start codon and stop codon of NDV.

[0024] The region 961-1440 of the Fiber 2 gene (Fiber2/C gene) of the Fowl Adenovirus serotype 4 has the sequence of SEQ ID NO: 2.

[0025] The target fragment 3 and target fragment 4 were connected by in-fusion in vitro ligation kit. The ligation product was transformed into E. coli DH5a cells. The transformed product was coated with LB medium, and single colony was selected and cultured in liquid medium. The truncated Fiber 2 gene was amplified by PCR for identifying the positive plasmid, and the positive plasmid was extracted for sequencing analysis of the whole plasmids. The plasmid with correct sequencing was named pLS-tFib2-C.

[0026] 1.3 Rescue and Recovery of Recombinant NDV

[0027] When BHK-21 cells grow to 80-90% density, inoculated with recombinant vaccinia virus expressing T7 RNA polymerase (0.01 MOI). After 1 hour, the transcription plasmid pLS-tFib2-C and three helper plasmids (pVAX-NP, pVAX-P and pcDNA-L) were co-transfected into BHK-21 cells. 96-120 hours after transfection, the culture supernatant was collected and the culture supernatant was filtered with a 0.22 μm filter. The culture supernatant was inoculated into SPF chicken embryos aged 9-10 days, cultured for 96-120 h, and chicken embryo allantoic fluid was collected. Through HA titer determination and RT-PCR sequencing analysis, the recombinant NDV strain rLS-tFib2-C was obtained. The construction methods and steps of the remaining four recombinant NDV strains were basically the same as this strain, and finally five recombinant NDV strains were obtained.

Example 2

[0028] Immunogenicity Test of Heat-Resistant Recombinant NDV Strain Capable of Expressing Fowl Adenovirus Serotype 4a Immunogenic Gene

[0029] The immune protection test against Fowl Adenovirus for the five above-mentioned recombinant NDV strains were carried out. Seventy one-week-old SPF chicks were randomly divided into 7 groups, 10 per group. Groups 1-5 were immunized with recombinant NDV strains rLS-Fib2, rLS-tFib2-A, rLS-tFib2-B, rLS-tFib2-C, rLS-Penton, respectively. Group 6 was immunized with LaSota strain, and group 7 was a blank control group. The immunization dose was 10.sup.7 EID.sub.50/bird, and the immunization method was nose drops and eye drops. Two weeks after the initial immunization, a booster immunization was carried out in the same manner and dose. Two weeks after immunization, 7 groups of test chickens were challenged with Fowl Adenovirus serotype 4 virulent at a dose of 10 LD.sub.50/bird. After that, the health status of the chickens was observed every day, the death situation was recorded, and the survival curve of the test chickens was drawn. As shown in FIG. 3, the survival rates of rLS-Fib2, rLS-tFib2-A, rLS-tFib2-B, rLS-tFib2-C, rLS-Penton, LaSota and the blank control group were 80%, 70%, 60%, 100%, 50%, 40% and 40%, respectively. Therefore, among the five newly constructed recombinant NDV, only rLS-tFib2-C strain can provide 100% protection for immunized chickens against Fowl Adenovirus serotype 4. The rLS-tFib2-C strain also had a 100% protection against NDV. Therefore, the rLS-tFib2-C strain can be used as a candidate strain for the dual heat-resistant live vaccine against Angraradisease and Newcastle disease.

Example 3

[0030] Thermal Stability Test of Recombinant NDV Strain rLS-tFib2-C

[0031] The allantoic fluid infected with the recombinant NDV rLS-tFib2-C strain was aliquoted in EP tubes with 100 μL/tube, and heat-treated in a 56° C. water bath. The LaSota strain control was set. The virus allantoic fluid was taken out at 0, 2, 5, 10, 15, 30, 60, 120, and 180 minutes, and quickly placed on ice to detect the HA titer of the virus and the changes in titer is counted. The results showed that the rLS-tFib2-C strain still had hemagglutination titer after heat treatment for 120 minutes, while the control LaSota strain had dropped to 1 log 2 after heat treatment for 5 minutes and to 0 for 10 minutes. The heat resistance of virus infectivity was further tested. After the corresponding time of treatment at 56° C., the BHK-21 cells were inoculated with a gradient dilution and the TCID.sub.50 titer change was measured. The curve of the heat resistance of infectivity was drawn. The time T.sub.90 was calculated required for the infectivity to decrease by 1 log.sub.10 (90%). The results showed that the T.sub.90 of rLS-tFib2-C strain and LaSota strain were 12.4 and 1.5 min, respectively. Therefore, compared with the parent strain LaSota, the thermal stability of the recombinant NDV rLS-tFib2-C strain has been significantly improved.

Example 4

[0032] Cell Proliferation Test of Recombinant NDV Strain rLS-tFib2-C

[0033] In order to analyze whether HN gene replacement and Fiber2/C gene insertion affect the cell proliferation titer of rLS-tFib2-C strain, the cell proliferation of rLS-tFib2-C and the parent LaSota strain were compared. The two diluted viruses were inoculated into BHK-21 cells that had grown into a dense monolayer, and cell supernatants were collected at 6, 12, 24, 48, 72, and 96 hours after inoculation. The collected supernatant was diluted by a 10-fold gradient, and 100 μL of each dilution was inoculated into a 96-well plate containing a single layer of BHK-21 cells. Three replicates were set for each dilution. TCID.sub.50 was calculated according to the cytopathic condition and the growth kinetic curve of the virus was drawn. The results were shown in FIG. 4. The rLS-tFib2-C strain basically reached a plateau 72 h after infection with the cells, with a titer of 10.sup.7.50 TCID.sub.50/ml, which was similar to the growth curve of the parent LaSota strain. Therefore, the genetic modification of the virus did not affect the cell proliferation titer of the rLS-tFib2-C strain.

Example 5

[0034] Pathogenicity Test of Recombinant NDV Strain rLS-tFib2-C

[0035] The pathogenicity of rLS-tFib2-C strain is evaluated by the mean death time of minimum lethal dose of chicken embryo of the virus (MDT/MLD) and the intracerebral pathogenicity index (ICPI). The detection method for MDT/MLD was as follows: the allantoic fluid of the rLS-tFib2-C strain was 10-fold serial diluted and inoculated into SPF chicken embryos with 100 μL/piece. Observation was continued for 7 days, the death time of the chicken embryos was recorded, and the MDT/MLD value was calculated. The detection method for ICPI was as follows: the allantoic fluid of the rLS-tFib2-C strain with 10-fold dilutions was inoculated into 1-day-old SPF chicks with 10 per group. The inoculation volume was 50 μL/bird. Observe once a day, and score the chickens. Normal chickens were scored 0, sick chicken was scored 1, and dead chicken was scored 2. The ICPI value was calculated with a total of 8 days of observation. The results showed that the chicken embryos inoculated with different dilutions of the virus did not die for 120 h. The MDT/MLD value of the rLS-tFib2-C strain was greater than 120 h, and the ICPI value was 0.00. Similarly, the MDT of the parent strain LaSota was greater than 120 h, and the ICPI value was 0.00. Therefore, the rLS-tFib2-C strain maintains the attenuated characteristics of the parent LaSota strain.