浙江农业学报 ›› 2025, Vol. 37 ›› Issue (12): 2468-2478.DOI: 10.3969/j.issn.1004-1524.20240730
收稿日期:2024-08-13
出版日期:2025-12-25
发布日期:2026-01-09
作者简介:谈荣想(1999—),男,江西瑞昌人,硕士研究生,研究方向为水生动物病害与免疫学。E-mail:2395774885@qq.com
通讯作者:
*许婷,E-mail:xuting@usx.edu.cn
TAN Rongxiang1(
), SI Guangjie2, SUN Haitao2, XU Ting1,*(
)
Received:2024-08-13
Online:2025-12-25
Published:2026-01-09
摘要: 为建立一种可同时检测十足目虹彩病毒1(Decapod iridescent virus 1, DIV1)与虾肝肠胞虫(Enterocytozoon hepatopenaei, EHP)的方法,本研究在已有DIV1实时荧光定量PCR(quantitative real-time PCR, qPCR)检测方法的基础上,开发了一种基于SYBR Green I的双重qPCR方法,分别靶向DIV1的主要衣壳蛋白(major capsid protein, MCP)基因和EHP的孢壁蛋白(spore wall protein, SWP)基因。结果显示,该方法中DIV1与EHP的熔解温度(Tm)分别为(82.0±0.5)℃和(77.0±0.5)℃,能够特异性检出DIV1和EHP,而对其他常见虾病原和健康虾样本的检测结果均为阴性;在35个循环内,DIV1与EHP的最低检测限分别为75 copies·μL-1和15 copies·μL-1;重复性试验显示,组内和组间变异系数均低于2%。综上,本研究建立的双重qPCR检测方法具有高度的特异性、灵敏度与重复性,适用于虾中DIV1和EHP感染的快速监测。
中图分类号:
谈荣想, 斯广杰, 孙海涛, 许婷. 十足目虹彩病毒1和虾肝肠胞虫双重荧光定量PCR检测方法的建立[J]. 浙江农业学报, 2025, 37(12): 2468-2478.
TAN Rongxiang, SI Guangjie, SUN Haitao, XU Ting. Establishment of a double quantitative PCR method for the detection of Decapod iridescent virus 1 and Enterocytozoon hepatopenaei[J]. Acta Agriculturae Zhejiangensis, 2025, 37(12): 2468-2478.
| 引物名称 Primer name | 引物序列(5'→3') Primer sequence(5'→3') | 扩增片段长度 Product length/bp | 目的 Purpose |
|---|---|---|---|
| DIV1-QF | GCCATTCCCGAACTCACC | 154 | 双重qPCR方法检测DIV1 |
| DIV1-QR | CTTCACCCTTTGCCGCTT | Detection of DIV1 by double qPCR method | |
| SWP-stdF | TTAAGTAATTACGAGTTTGGC | 318 | 构建pMD-SWP标准质粒 |
| SWP-stdR | GTTATTTACAGTTTTGCGTTG | Construction of pMD-SWP standard plasmid | |
| EHP-QF | TGGCGGCACAATTCTCAAACAT | 102 | 双重qPCR方法检测EHP |
| EHP-QR | GCTGTGTCTGTGTAAATATCGTC | Detection of EHP by double qPCR method |
表1 本研究的引物序列信息
Table 1 Sequences of primers used in this study
| 引物名称 Primer name | 引物序列(5'→3') Primer sequence(5'→3') | 扩增片段长度 Product length/bp | 目的 Purpose |
|---|---|---|---|
| DIV1-QF | GCCATTCCCGAACTCACC | 154 | 双重qPCR方法检测DIV1 |
| DIV1-QR | CTTCACCCTTTGCCGCTT | Detection of DIV1 by double qPCR method | |
| SWP-stdF | TTAAGTAATTACGAGTTTGGC | 318 | 构建pMD-SWP标准质粒 |
| SWP-stdR | GTTATTTACAGTTTTGCGTTG | Construction of pMD-SWP standard plasmid | |
| EHP-QF | TGGCGGCACAATTCTCAAACAT | 102 | 双重qPCR方法检测EHP |
| EHP-QR | GCTGTGTCTGTGTAAATATCGTC | Detection of EHP by double qPCR method |
图1 虾肝肠胞虫SWP基因的PCR扩增结果 M, DL2000 DNA marker;1, SWP基因扩增产物。
Fig.1 PCR amplification results of SWP gene from Enterocytozoon hepatopenaei M, DL2000 DNA marker; 1, PCR amplification products of SWP gene.
图2 十足目虹彩病毒1与虾肝肠胞虫的双重SYBR Green I qPCR熔解曲线 EHP,EHP标准质粒pMD-SWP的熔解峰;DIV1,DIV1标准质粒pMD-MCP的熔解峰;NTC,阴性对照。
Fig.2 Melting curve of the double SYBR Green I qPCR for Decapod iridescent virus 1 (DIV1) and Enterocytozoon hepatopenaei(EHP) EHP, The melting curve of EHP standard plasmid pMD-SWP; DIV1,The melting curve of DIV1 standard plasmid pMD-MCP; NTC,Negative control.
图3 DIV1双重SYBR Green I qPCR扩增曲线和灵敏性试验结果 1~7,7.5×107~7.5×101 copies·μL-1的pMD-MCP系列标准品;NTC,阴性对照。
Fig.3 Amplification curve and sensitivity of the double SYBR Green I qPCR for DIV1 1-7, 7.5×107-7.5×101 copies·μL-1 of the standard plasmids pMD-MCP; NTC, Negative control.
图4 EHP双重SYBR Green I qPCR扩增曲线和灵敏性试验结果 1~7,1.5×107~1.5×101 copies·μL-1的pMD-SWP系列标准品;NTC,阴性对照。
Fig.4 Amplification curve and sensitivity of the double SYBR Green I qPCR for EHP 1-7, 1.5×107-1.5×101 copies·μL-1 of the standard plasmids pMD-SWP; NTC, Negative control.
图6 DIV1和EHP双重SYBR Green I qPCR检测的熔解曲线 EHP,梯度稀释的pMD-SWP系列标准品;DIV1,梯度稀释的pMD-MCP系列标准品;NTC,阴性对照。
Fig.6 Melting curve for the double SYBR Green I qPCR for DIV1 and EHP EHP, Serial dilution of standard plasmid pMD-SWP; DIV1, Serial dilution of standard plasmid pMD-MCP; NTC, Negative control.
图7 双重SYBR Green I qPCR特异性试验结果 A,扩增曲线;B,熔解曲线。DIV1,DIV1阳性样本;EHP,EHP阳性样本;DIV1+EHP,混合感染样本;others,其他虾病阳性样本、健康凡纳滨对虾幼苗和阴性对照。
Fig.7 Analysis of the specificity of the double SYBR Green I qPCR A, Amplification curve; B, Melting curve. DIV1, DIV1 positive sample; EHP, EHP positive sample; DIV1+EHP, DIV1 and EHP co-infection sample; Others, Samples infected with other shrimp pathogens, healthy L. vannamei juveniles and negative control.
| pMD-MCP标准品拷贝数 Copies of the standard plasmid | 组内重复Intra-assay variability | 组间重复 Inter-assay variability | ||||||
|---|---|---|---|---|---|---|---|---|
| 第1天Day 1 | 第5天Day 5 | 第10天Day 10 | ||||||
| pMD-MCP/(copies·μL-1) | Cq | CV/% | Cq | CV/% | Cq | CV/% | Cq | CV/% |
| 7.5×107 | 13.43±0.12 | 0.92 | 13.77±0.06 | 0.46 | 13.35±0.03 | 0.19 | 13.52±0.21 | 1.52 |
| 7.5×106 | 16.80±0.02 | 0.10 | 17.04±0.12 | 0.68 | 17.00±0.06 | 0.35 | 16.94±0.13 | 0.76 |
| 7.5×105 | 20.46±0.06 | 0.31 | 20.52±0.02 | 0.09 | 20.40±0.02 | 0.10 | 20.46±0.06 | 0.30 |
| 7.5×104 | 23.90±0.05 | 0.21 | 24.35±0.08 | 0.33 | 24.04±0.07 | 0.30 | 24.09±0.21 | 0.86 |
| 7.5×103 | 27.21±0.08 | 0.31 | 27.55±0.06 | 0.21 | 27.54±0.08 | 0.27 | 27.43±0.18 | 0.64 |
| 7.5×102 | 30.65±0.15 | 0.50 | 31.12±0.02 | 0.06 | 30.94±0.02 | 0.05 | 30.90±0.22 | 0.71 |
| 7.5×101 | 33.75±0.04 | 0.12 | 34.12±0.02 | 0.05 | 33.62±0.08 | 0.25 | 33.83±0.23 | 0.68 |
表2 DIV1双重SYBR Green I qPCR检测的组内和组间重复性
Table 2 Intra-assay and inter-assay variability of the double SYBR Green I qPCR detection assay for DIV1
| pMD-MCP标准品拷贝数 Copies of the standard plasmid | 组内重复Intra-assay variability | 组间重复 Inter-assay variability | ||||||
|---|---|---|---|---|---|---|---|---|
| 第1天Day 1 | 第5天Day 5 | 第10天Day 10 | ||||||
| pMD-MCP/(copies·μL-1) | Cq | CV/% | Cq | CV/% | Cq | CV/% | Cq | CV/% |
| 7.5×107 | 13.43±0.12 | 0.92 | 13.77±0.06 | 0.46 | 13.35±0.03 | 0.19 | 13.52±0.21 | 1.52 |
| 7.5×106 | 16.80±0.02 | 0.10 | 17.04±0.12 | 0.68 | 17.00±0.06 | 0.35 | 16.94±0.13 | 0.76 |
| 7.5×105 | 20.46±0.06 | 0.31 | 20.52±0.02 | 0.09 | 20.40±0.02 | 0.10 | 20.46±0.06 | 0.30 |
| 7.5×104 | 23.90±0.05 | 0.21 | 24.35±0.08 | 0.33 | 24.04±0.07 | 0.30 | 24.09±0.21 | 0.86 |
| 7.5×103 | 27.21±0.08 | 0.31 | 27.55±0.06 | 0.21 | 27.54±0.08 | 0.27 | 27.43±0.18 | 0.64 |
| 7.5×102 | 30.65±0.15 | 0.50 | 31.12±0.02 | 0.06 | 30.94±0.02 | 0.05 | 30.90±0.22 | 0.71 |
| 7.5×101 | 33.75±0.04 | 0.12 | 34.12±0.02 | 0.05 | 33.62±0.08 | 0.25 | 33.83±0.23 | 0.68 |
| pMD-SWP标准品拷贝数 Copies of the standard plasmid | 组内重复Intra-assay variability | 组间重复 Inter-assay variability | ||||||
|---|---|---|---|---|---|---|---|---|
| 第1天Day 1 | 第5天Day 5 | 第10天Day 10 | ||||||
| pMD-SWP/(copies·μL-1) | Cq | CV/% | Cq | CV/% | Cq | CV/% | Cq | CV/% |
| 1.5×107 | 14.05±0.03 | 0.23 | 14.13±0.04 | 0.30 | 14.17±0.02 | 0.13 | 14.11±0.06 | 0.41 |
| 1.5×106 | 17.40±0.04 | 0.23 | 17.48±0.05 | 0.26 | 17.45±0.05 | 0.29 | 17.45±0.05 | 0.31 |
| 1.5×105 | 20.62±0.07 | 0.32 | 20.75±0.10 | 0.46 | 20.80±0.11 | 0.53 | 20.72±0.12 | 0.55 |
| 1.5×104 | 24.15±0.06 | 0.24 | 24.33±0.13 | 0.55 | 24.47±0.04 | 0.18 | 24.32±0.16 | 0.65 |
| 1.5×103 | 27.64±0.03 | 0.12 | 27.83±0.03 | 0.10 | 27.83±0.02 | 0.05 | 27.77±0.10 | 0.35 |
| 1.5×102 | 31.09±0.07 | 0.21 | 31.31±0.14 | 0.45 | 31.16±0.14 | 0.45 | 31.19±0.14 | 0.45 |
| 1.5×101 | 33.91±0.11 | 0.32 | 33.89±0.20 | 0.58 | 34.60±0.15 | 0.43 | 34.13±0.37 | 1.09 |
表3 EHP双重SYBR Green I qPCR检测的组内和组间重复性
Table 3 Intra-assay and inter-assay variability of the double SYBR Green I qPCR detection assay for EHP
| pMD-SWP标准品拷贝数 Copies of the standard plasmid | 组内重复Intra-assay variability | 组间重复 Inter-assay variability | ||||||
|---|---|---|---|---|---|---|---|---|
| 第1天Day 1 | 第5天Day 5 | 第10天Day 10 | ||||||
| pMD-SWP/(copies·μL-1) | Cq | CV/% | Cq | CV/% | Cq | CV/% | Cq | CV/% |
| 1.5×107 | 14.05±0.03 | 0.23 | 14.13±0.04 | 0.30 | 14.17±0.02 | 0.13 | 14.11±0.06 | 0.41 |
| 1.5×106 | 17.40±0.04 | 0.23 | 17.48±0.05 | 0.26 | 17.45±0.05 | 0.29 | 17.45±0.05 | 0.31 |
| 1.5×105 | 20.62±0.07 | 0.32 | 20.75±0.10 | 0.46 | 20.80±0.11 | 0.53 | 20.72±0.12 | 0.55 |
| 1.5×104 | 24.15±0.06 | 0.24 | 24.33±0.13 | 0.55 | 24.47±0.04 | 0.18 | 24.32±0.16 | 0.65 |
| 1.5×103 | 27.64±0.03 | 0.12 | 27.83±0.03 | 0.10 | 27.83±0.02 | 0.05 | 27.77±0.10 | 0.35 |
| 1.5×102 | 31.09±0.07 | 0.21 | 31.31±0.14 | 0.45 | 31.16±0.14 | 0.45 | 31.19±0.14 | 0.45 |
| 1.5×101 | 33.91±0.11 | 0.32 | 33.89±0.20 | 0.58 | 34.60±0.15 | 0.43 | 34.13±0.37 | 1.09 |
| 巢式PCR检测 Detection by nested-PCR | 双重SYBR Green I qPCR检测Detection by double SYBR Green I qPCR | |||
|---|---|---|---|---|
| 阳性Positive | 阴性Negative | 总计Total | ||
| DIV1 | 阳性Positive | 4 | 0 | 4 |
| 阴性Negative | 2 | 49 | 51 | |
| 总计Total | 6 | 49 | 55 | |
| EHP | 阳性Positive | 9 | 0 | 9 |
| 阴性Negative | 0 | 46 | 46 | |
| 总计Total | 9 | 46 | 55 | |
表4 临床样本使用巢式PCR和双重SYBR Green I qPCR检测的结果
Table 4 Detection results of clinical samples by nested-PCR and double SYBR Green I qPCR
| 巢式PCR检测 Detection by nested-PCR | 双重SYBR Green I qPCR检测Detection by double SYBR Green I qPCR | |||
|---|---|---|---|---|
| 阳性Positive | 阴性Negative | 总计Total | ||
| DIV1 | 阳性Positive | 4 | 0 | 4 |
| 阴性Negative | 2 | 49 | 51 | |
| 总计Total | 6 | 49 | 55 | |
| EHP | 阳性Positive | 9 | 0 | 9 |
| 阴性Negative | 0 | 46 | 46 | |
| 总计Total | 9 | 46 | 55 | |
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