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Lu TF, Sun B, Yu TY, Wu YJ, Zhou J, Wu SG. Porcine Endogenous Retroviruses: Quantification of the Viral Copy Number for the Four Miniature Pig Breeds in China. Front Microbiol 2022; 13:840347. [PMID: 35369498 PMCID: PMC8965148 DOI: 10.3389/fmicb.2022.840347] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 01/12/2022] [Indexed: 11/13/2022] Open
Abstract
Domestic pigs has served not only as one of the most important economy livestock but also as ideal organ-source animals owing to similarity in anatomy, physiology, and organ size to humans. Howerer, the barrier of the cross-species transmission risk of porcine endogenous retrovirus (PERVs) blocked the pig-to-human xenotransplantation. PERVs are integrated into pigs’ genomes and cannot be eliminated by designated or specified pathogen-free breeding. PERVs are an important biosafety issue in xenotransplantation because they can be released from normal pig cells and infect human cells in vitro under certain conditions. Screening and analyzing the presence of PERVs in pig genome will provide essential parameters for pig breed sources. In China, four miniature pig breeds, such as Guizhou miniature pig (GZ), Bama miniature pig (BM), Wuzhishan miniature pig (WZS), and Juema miniature pig (JM), were the main experimental miniature pig breeds, which were widely used. In this study, PCR was performed to amplify env-A, env-B, and env-C for all individuals from the four breeds. The results revealed that PERV env-A and env-B were detected in all individuals and the lowest ratios of PERV env-C was 17.6% (3/17) in the GZ breed. Then, PERV pol and GAPDH were detected using the droplet digital PCR (ddPCR) method. As the reference of GAPDH copy number, the copy numbers of PERVs were at the median of 12, 16, 14, and 16 in the four miniature pig breeds (GZ, BM, WZS, and JM), respectively. Furthermore, the copy number of the PERV pol gene in many organs from the GZ breed was analyzed using ddPCR. The copy numbers of PERV pol gene were at the median of 7 copies, 8 copies, 8 copies, 11 copies, 5 copies, 6 copies, and 7 copies in heart, liver, spleen, lung, kidney, muscle, and skin, and the maximum number was 11 copies in the lung. The minimum number was 5 copies in the kidney as the reference of GAPDH. These data suggest that GZ breed has the lower PERVs copy number in the genome, and may be an ideal organ-source miniature pig breed for the study of the pig-to-human xenotransplantation.
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Affiliation(s)
- Tao-Feng Lu
- Institute for Laboratory Animal Research, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Bo Sun
- The First Clinical Medical College, Jinan University, Guangzhou, China
| | - Tai-Yong Yu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Yan-Jun Wu
- Institute for Laboratory Animal Research, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Jie Zhou
- Shanghai Laboratory Animal Research Center, Shanghai, China
| | - Shu-Guang Wu
- Institute for Laboratory Animal Research, Guizhou University of Traditional Chinese Medicine, Guiyang, China
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Ma Y, Zhao X, Jia J, Yang Y, Fan R, Lv M, Ding F, Wu J, Zhang J. Analysis of Protein Expression in Human Cells Cocultured with Porcine Peripheral Blood Mononuclear Cells. Intervirology 2019; 61:237-246. [PMID: 30889573 DOI: 10.1159/000495179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 10/15/2018] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE Porcine endogenous retroviruses (PERV) involved in pig to human xenotransplantation have raised great concerns because of their ubiquitous nature in pigs and their ability of infecting human cells in vitro. Although no significant cytopathic effect attributed to PERV was evident on PERV-infected human embryonic kidney 293 (HEK293) cells, we did proteomic analysis to investigate the differences of protein profile in order to further characterize the effect of PERV infection. METHODS HEK293 cells were cocultured with porcine peripheral blood mononuclear cells (PBMCs). Protein profiles of PERV-infected and -noninfected HEK293 cells were analyzed by two-dimensional gel electrophoresis (2-DE). Protein spots with at least 1.5-fold alteration were identified by high-definition mass spectrometry (HDMS) analysis. Then real-time RT-PCR and Western blotting were performed to validate the proteomic results. RESULTS Differential analysis of PERV-infected and -noninfected HEK293 cells by 2-DE revealed ten differentially regulated proteins. The proteins identified by HDMS were involved in various cellular pathways including signal transduction, cell apoptosis, and protein synthesis. CONCLUSION The results of this study revealed differentially expressed proteins in HEK293 cells cocultured with porcine PBMCs and implied that these changes were probably induced by PERV infection. These results provide clues and potential links to understanding the molecular effect of the infection by human-tropic PERV.
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Affiliation(s)
- Yuyuan Ma
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China,
| | - Xiong Zhao
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China
| | - Junting Jia
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China.,Department of Blood Transfusion, Chinese PLA General Hospital, Beijing, China
| | - Yongxian Yang
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China
| | - Rui Fan
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China
| | - Maomin Lv
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China
| | - Fang Ding
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China
| | - Jianmin Wu
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China.,Guangxi Veterinary Research Institute, Nanning, China
| | - Jingang Zhang
- Beijing Key Laboratory of Blood Safety and Supply Technologies, Institute of Health Service and Transfusion Medicine, Academy of Military Medical Sciences, Beijing, China
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Łopata K, Wojdas E, Nowak R, Łopata P, Mazurek U. Porcine Endogenous Retrovirus (PERV) - Molecular Structure and Replication Strategy in the Context of Retroviral Infection Risk of Human Cells. Front Microbiol 2018; 9:730. [PMID: 29755422 PMCID: PMC5932395 DOI: 10.3389/fmicb.2018.00730] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 03/28/2018] [Indexed: 12/28/2022] Open
Abstract
The xenotransplantation of porcine tissues may help overcome the shortage of human organs for transplantation. However, there are some concerns about recipient safety because the risk of porcine endogenous retrovirus (PERV) transmission to human cells remains unknown. Although, to date, no PERV infections have been noted in vivo, the possibility of such infections has been confirmed in vitro. Better understanding of the structure and replication cycle of PERVs is a prerequisite for determining the risk of infection and planning PERV-detection strategies. This review presents the current state of knowledge about the structure and replication cycle of PERVs in the context of retroviral infection risk.
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Affiliation(s)
- Krzysztof Łopata
- Department of Molecular Biology, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Poland
| | - Emilia Wojdas
- Department of Molecular Biology, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Poland.,Department of Instrumental Analysis, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Poland
| | - Roman Nowak
- Department of Molecular Biology, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Poland
| | - Paweł Łopata
- Department of Molecular Biology, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Poland
| | - Urszula Mazurek
- Department of Molecular Biology, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Poland
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Tang HB, Ouyang K, Rao GB, Ma L, Zhong H, Bai A, Qin S, Chen F, Lin J, Cao Y, Liao YJ, Zhang J, Wu J. Characterization of Complete Genome Sequences of a Porcine Endogenous Retrovirus Isolated From China Bama Minipig Reveals an Evolutionary Time Earlier Than That of Isolates From European Minipigs. Transplant Proc 2016; 48:222-8. [PMID: 26915872 DOI: 10.1016/j.transproceed.2015.12.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 12/10/2015] [Indexed: 10/22/2022]
Abstract
BACKGROUND A porcine endogenous retroviruses (PERV) isolate, PERV-A-BM, was isolated from a Guangxi Bama minipig in China. METHODS To understand its genetic variation and evolution, the complete PERV-A-BM genome sequences were determined and compared with isolates from different Sus scrofa breeds and porcine cell lines. A total of 69 nucleotide substitutions were found in the full-length genome, including 26 non-synonymous mutations. RESULTS Phylogenetic trees based on the complete genome sequence as well as the gag, pol, and env gene sequences from 21 PERV isolates demonstrated that the PERV-A-BM was closely related to the EF133960 isolate from Chinese Wuzhishan miniature pigs inbred in Hainan, China, and distantly related to strains isolated from European-born pigs. CONCLUSIONS The estimation of age in the proviral PERV-A-BM integrating into the host genome reveals that the age of PERV-A-BM is at least 8.3 × 10(6) years, an evolutionary time earlier than that of isolates from European-born pigs.
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Affiliation(s)
- H-B Tang
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - K Ouyang
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - G-B Rao
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - L Ma
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - H Zhong
- School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning, China
| | - A Bai
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - S Qin
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - F Chen
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - J Lin
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - Y Cao
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - Y-J Liao
- School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning, China
| | - J Zhang
- Laboratory for Viral Safety of National Centre of Biomedical Analysis, Institute of Transfusion Medicine, The Academy of Military Medical Sciences, Beijing, China
| | - J Wu
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China.
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DIAO YUMEI, HONG JING. Feasibility and safety of porcine Descemet’s membrane as a carrier for generating tissue-engineered corneal endothelium. Mol Med Rep 2015; 12:1929-34. [DOI: 10.3892/mmr.2015.3665] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 12/02/2014] [Indexed: 11/06/2022] Open
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Porcine endogenous retroviruses in xenotransplantation--molecular aspects. Viruses 2014; 6:2062-83. [PMID: 24828841 PMCID: PMC4036542 DOI: 10.3390/v6052062] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 04/15/2014] [Accepted: 04/26/2014] [Indexed: 02/06/2023] Open
Abstract
In the context of the shortage of organs and other tissues for use in human transplantation, xenotransplantation procedures with material taken from pigs have come under increased consideration. However, there are unclear consequences of the potential transmission of porcine pathogens to humans. Of particular concern are porcine endogenous retroviruses (PERVs). Three subtypes of PERV have been identified, of which PERV-A and PERV-B have the ability to infect human cells in vitro. The PERV-C subtype does not show this ability but recombinant PERV-A/C forms have demonstrated infectivity in human cells. In view of the risk presented by these observations, the International Xenotransplantation Association recently indicated the existence of four strategies to prevent transmission of PERVs. This article focuses on the molecular aspects of PERV infection in xenotransplantation and reviews the techniques available for the detection of PERV DNA, RNA, reverse transcriptase activity and proteins, and anti-PERV antibodies to enable carrying out these recommendations. These methods could be used to evaluate the risk of PERV transmission in human recipients, enhance the effectiveness and reliability of monitoring procedures, and stimulate discussion on the development of improved, more sensitive methods for the detection of PERVs in the future.
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Chung HC, Nguyen VG, Moon HJ, Kim HK, Park SJ, Lee JH, Choi MG, Kim AR, Park BK. Inhibition of porcine endogenous retrovirus in PK15 cell line by efficient multitargeting RNA interference. Transpl Int 2013; 27:96-105. [PMID: 24138389 DOI: 10.1111/tri.12219] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 08/20/2013] [Accepted: 10/16/2013] [Indexed: 12/30/2022]
Abstract
To effectively suppress porcine endogenous retroviruses (PERV)s, RNAi technique was utilized. RNAi is the up-to-date skill for gene knockdown which simultaneously multitargets both gag and pol genes critical for replication of PERVs. Previously, two of the most effective siRNAs (gag2, pol2) were found to reduce the expression of PERVs. Concurrent treatment of these two siRNAs (gag2+pol2) showed knockdown efficiency of up to 88% compared to negative control. However, despite the high initial knockdown efficiency 48 h after transfection caused by siRNA, it may only be a transient effect of suppressing PERVs. The multitargeting vector was designed, containing both gag and pol genes and making use of POL II miR Expression Vector, which allowed for persistent and multiple targeting. This is the latest shRNA system technique expressing and targeting like miRNA. Through antibiotics resistance characteristics utilizing this vector, miRNA-transfected PK15 cells (gag2-pol2) were selected during 10 days. An 88.1% reduction in the level of mRNA expression was found. In addition, we performed RT-activity analysis and fluorescence in situ hybridization assay, and it demonstrated the highest knockdown efficiency in multitargeting (gag2+pol2) miRNA group. Therefore, according to the results above, gene knockdown system (siRNA and shRNA) through multitargeting strategy could effectively inhibit PERVs.
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Affiliation(s)
- Hee-Chun Chung
- Department of Veterinary Medicine Virology Laboratory, College of Veterinary Medicine and Research Institute for Veterinary Science Seoul National University, Seoul, Korea
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Li ZG, Liu GB, Pan MX, Wu QS, Ge M, Du J, Wang Y, Gao Y. Knockdown of porcine endogenous retroviruses by RNA interference in Chinese experimental miniature pig fibroblasts. Transplant Proc 2013; 45:748-55. [PMID: 23498816 DOI: 10.1016/j.transproceed.2012.03.068] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2011] [Revised: 01/30/2012] [Accepted: 03/06/2012] [Indexed: 11/27/2022]
Abstract
BACKGROUND The clinical application of porcine-derived xenotransplants is limited by the potential risk of infection due to the presence of porcine endogenous retrovirus (PERV) in tissues, organs, and cells. The establishment of pig fibroblasts with low PERV expression and without PERV-C can provide a nuclear donor to generate a safer transgenic pig. METHODS In this study, we obtained Chinese Experimental Miniature Pig fibroblasts (CEMPF) with low expression of PERV and none of PERV-C. We designed small interfering RNA (siRNA) expressed as short hairpin RNAs (shRNA) based on the highly conserved gag and pol regions of PERV and screened for the most effective siRNA to inhibit PERV expression. The selected shRNA-pol3 fragment was introduced into the CEMPF to obtain an engineered CEMPF stably expressing shRNA-pol3. RESULTS The PERV mRNA expression level in the engineered CEMPF was only 7.9% of that observed in fibroblasts from wild-type CEMPF, PERV P15E protein expression was significantly reduced. HEK293 cells cocultured with the supernate of the engineered CEMPF showed no PERV infection. CONCLUSIONS Engineered CEMPF, which possess no risk of PERV-A/C infection, can serve as a nuclear donor to generate xenograft donor pigs.
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Affiliation(s)
- Z-G Li
- Department of Hepatobiliary Surgery, Zhujiang Hospital, Guangzhou, PR China
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Xiang S, Ma Y, Yan Q, Lv M, Zhao X, Yin H, Zhang N, Jia J, Yu R, Zhang J. Construction and characterization of an infectious replication competent clone of porcine endogenous retrovirus from Chinese miniature pigs. Virol J 2013; 10:228. [PMID: 23837947 PMCID: PMC3718662 DOI: 10.1186/1743-422x-10-228] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Accepted: 05/30/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Xenotransplantation from animals has been considered to be a preferable approach to alleviate the shortage of human allografts. Pigs are the most suitable candidate because of the anatomical and physiological similarities shared with humans as well as ethical concerns. However, it may be associated with the risk of transmission of infectious porcine pathogens. Porcine endogenous retroviruses (PERVs) are of particular concern because they have been shown to infect human cells in vitro. To date, researches on the molecular characteristics and potential pathogenicity of PERV are still tenuous. In this report, an infectious replication competent clone of PERV from Wuzhishan pigs (WZSPs) in China was generated and characterized. This infectious clone will contribute to studies on PERV virology and control of PERV in xenotransplantation using Chinese miniature pigs. METHODS The proviral DNA of PERV from WZSPs was amplified in two overlapping halves. Then the two fragments were isolated, subcloned and fused to generate pBluescriptαSK+-WZS-PERV recombinant clones. Screened with RT-PCR, a molecular clone of PERV designated as WZS-PERV(2) was selected. Its infectivity and replication competency were characterized in HEK293 cells by PCR, real-time fluorescent quantitative RT-PCR, western blot, indirect immunofluorescence assay as well as sequence analysis. RESULTS The ability of WZS-PERV(2) to infect human cells and produce infectious virions were shown after transfection of the clone into HEK293 cells and infection of PERV derived from this recombinant clone. The expression of Gag proteins were detected in HEK293 cells infected with the virus derived from the clone by the indirect immunofluorescence assay and western blot. The results of sequences analysis and comparison combined with the PCR based genotyping result demonstrated that the WZS-PERV(2) belonged to PERV-A subgroup. Compared with a previous proviral DNA clone of PERV (PERV-WZSP), G to A hypermutation occurred in the env gene of WZS-PERV(2) was found, whereas APOBEC proteins have the potential to inhibit the replication of a variety of retroviruses through a cDNA cytosine deamination mechanism, so we presumed these G to A hypermutation might be the contribution of porcine APOBEC3F. CONCLUSIONS Altogether, an infectious replication competent clone of PERV from Chinese miniature pigs (WZSPs) termed WZS-PERV(2) was generated, characterized and sequenced.
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Affiliation(s)
- Silong Xiang
- Key Laboratory of Drug Targeting and Drug Delivery System, Ministry of Education, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
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Denner J, Tönjes RR. Infection barriers to successful xenotransplantation focusing on porcine endogenous retroviruses. Clin Microbiol Rev 2012; 25:318-43. [PMID: 22491774 PMCID: PMC3346299 DOI: 10.1128/cmr.05011-11] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Xenotransplantation may be a solution to overcome the shortage of organs for the treatment of patients with organ failure, but it may be associated with the transmission of porcine microorganisms and the development of xenozoonoses. Whereas most microorganisms may be eliminated by pathogen-free breeding of the donor animals, porcine endogenous retroviruses (PERVs) cannot be eliminated, since these are integrated into the genomes of all pigs. Human-tropic PERV-A and -B are present in all pigs and are able to infect human cells. Infection of ecotropic PERV-C is limited to pig cells. PERVs may adapt to host cells by varying the number of LTR-binding transcription factor binding sites. Like all retroviruses, they may induce tumors and/or immunodeficiencies. To date, all experimental, preclinical, and clinical xenotransplantations using pig cells, tissues, and organs have not shown transmission of PERV. Highly sensitive and specific methods have been developed to analyze the PERV status of donor pigs and to monitor recipients for PERV infection. Strategies have been developed to prevent PERV transmission, including selection of PERV-C-negative, low-producer pigs, generation of an effective vaccine, selection of effective antiretrovirals, and generation of animals transgenic for a PERV-specific short hairpin RNA inhibiting PERV expression by RNA interference.
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Quereda JJ, Herrero-Medrano JM, Abellaneda JM, García-Nicolás O, Martínez-Alarcón L, Pallarés FJ, Ramírez P, Muñoz A, Ramis G. Porcine endogenous retrovirus copy number in different pig breeds is not related to genetic diversity. Zoonoses Public Health 2012; 59:401-7. [PMID: 22348392 DOI: 10.1111/j.1863-2378.2012.01467.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The risk of zoonoses is a major obstacle to xenotransplantation. Porcine endogenous retrovirus (PERV) poses a potential risk of zoonotic infection, and its control is a prerequisite for the development of clinical xenotransplantation. The copy number of PERV varies among different breeds, and it has been suggested that the PERV integrations number is increased by inbreeding. The purpose of this study was (i) to examine the copy number of PERV in different Spanish pig breeds, Spanish wild boar and commercial cross-bred pigs from five different farms and genetic background (CCP1-CCP5) and (ii) to investigate the correlation between PERV copy number and the genetic background of the pigs in order to improve the selection of pigs for xenotransplantation. PERV copy number was determined by quantitative, real-time polymerase chain reactions. Thirty-four microsatellite markers were genotyped to describe the genetic diversity within populations (observed and expected heterozygosities, Ho and He, respectively) and the inbreeding coefficient (F). Pearson's correlation coefficient was used to determine the relationship between PERV copy number and Ho, He and F. The copy number of PERV among different pig breeds was estimated to range between three (CCP1) and 43 copies (Iberian Pig). Statistical differences were found among the studied populations concerning PERV copy number. No correlation was found between the PERV copy number and the heterozygosity (calculated at an individual level or at a population level) or the inbreeding coefficient of each population. Our data suggest that pigs inbreeding does not increase PERV copy number and support the idea that careful selection of pigs for organ donation with reduced PERV copy number will minimize the risk of retrovirus transmission to the human receptor.
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Affiliation(s)
- J J Quereda
- Departamento de Producción Animal, Facultad de Veterinaria, Universidad de Murcia, Murcia, Spain.
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Genetic prevalence of porcine endogenous retrovirus in chinese experimental miniature pigs. Transplant Proc 2012; 43:2762-9. [PMID: 21911159 DOI: 10.1016/j.transproceed.2011.06.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 06/13/2011] [Accepted: 06/16/2011] [Indexed: 11/21/2022]
Abstract
Pig-to-human xenotransplantation poses the potential risk of interspecies transmission of porcine endogenous retrovirus (PERV). The Chinese experimental miniature pig may be used as a pig-to-human xenograft donor. However, data for the distribution of PERV provirus in genomic DNA and PERV expression at the RNA level for the Chinese experimental miniature pig population are lacking. In this study, PERV was investigated in this regard using polymerase chain reaction (PCR), real-time quantitative PCR, and real-time quantitative reverse transcription PCR. The results showed that the genotype distribution was PERV-A subtype 100%, PERV-B subtype 100%, and PERV-C subtype 30% among 20 pig genomic DNA samples. Both PERV copy number in genomic DNA and PERV expression at the RNA level varied significantly among individuals, ranging from 3.95 ± 0.14 to 95.52 ± 2.20 and 3.66 ± 0.13 to 43.03 ± 2.50, respectively. For some individuals, the PERV copy number (eg, 3.95 ± 0.14) in genomic DNA and PERV expression (eg, 3.66 ± 0.13) at the RNA level were low. These results suggested that the Chinese experimental miniature pig is a possible donor for xenotransplantation. Our results provide reference information for selective breeding, which will benefit the application of these animals for the study of xenotransplantation.
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Denner J. Infectious risk in xenotransplantation - what post-transplant screening for the human recipient? Xenotransplantation 2011; 18:151-7. [DOI: 10.1111/j.1399-3089.2011.00636.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Multiplex high resolution melting assay for estimation of Porcine Endogenous Retrovirus (PERV) relative gene dosage in pigs and detection of PERV infection in xenograft recipients. J Virol Methods 2011; 175:95-100. [PMID: 21545811 DOI: 10.1016/j.jviromet.2011.04.026] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 04/19/2011] [Accepted: 04/20/2011] [Indexed: 11/20/2022]
Abstract
Porcine Endogenous Retrovirus (PERV) poses an infectious risk in the field of xenotransplantation. This risk may be mitigated by breeding selectively animals bearing favorable PERV genetic characteristics including pigs with low levels of PERV integrated in the genome. A real-time quantitative polymerase chain reaction (PCR) assay employing the Roche High Resolution Melting (HRM) Master was used to estimate the relative gene dosage of PERV pol integrated within the pig genome. When assessed across 99 pigs of the Auckland Island breed numerous animals bearing low gene dosage were identified. The assay was adapted further to perform multiplex PCR for the detection of PERV infection within xenograft recipients. Besides PERV, amplification targets for the multiplex PCR include a pig cell marker for the determination of microchimerism and an internal amplification control (IAC) to assess the efficiency of nucleic acid isolation and effects of PCR inhibition. When 12 patients who had received porcine islet transplants were tested no evidence of PERV infection was found. The assay was shown to be specific, highly reproducible with superior performance over conventional nested PCR. This assay can be used as both a screening tool for PERV proviral levels within donor pigs and as a diagnostic tool to examine PERV transmission in human patients treated with porcine xenotransplantation material.
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