Patents by Inventor Xiang-Jin Meng
Xiang-Jin Meng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20130315944Abstract: The present invention also provides infectious DNA clones, biologically functional plasmid or viral vector containing the infectious nucleic acid genome molecule of Torque teno sus virus (TTsuV). The present invention also provides methods for diagnosing TTsuV infection via immunological methods, e.g., enzyme-linked immunoabsorbent assay (ELISA) and Western blot using PTTV specific antigens for detecting serum PTTV specific antibodies which indicate infections TTsuV1, TTsuV2, and individual TTsuV1 genotypes.Type: ApplicationFiled: March 15, 2013Publication date: November 28, 2013Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.Inventors: Xiang-Jin MENG, Yaowei HUANG
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Publication number: 20130149334Abstract: The present invention relates to infectious DNA clones, infectious chimeric DNA clones of porcine circovirus (PCV), vaccines and means of protecting pigs against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2. The new chimeric infectious DNA clone and its derived, avirulent chimeric virus are constructed from the nonpathogenic PCV1 in which the immunogenic ORF gene of the pathogenic PCV2 replaces a gene of the nonpathogenic PCV1, preferably in the same position. The chimeric virus advantageously retains the nonpathogenic phenotype of PCV1 but elicits specific immune responses against the pathogenic PCV2. The invention further embraces the immunogenic polypeptide expression products. In addition, the invention encompasses two mutations in the PCV2 immunogenic capsid gene and protein, and the introduction of the ORF2 mutations in the chimeric clones.Type: ApplicationFiled: October 7, 2011Publication date: June 13, 2013Inventors: Xiang-Jin Meng, Martijn Fenaux, Patrick G. Halbur
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Publication number: 20130142824Abstract: The present invention provides a novel infectious cDNA clone of porcine reproductive and respiratory syndrome virus (PRRSV), particularly for PRRSV strain VR2385; an improved DNA-launched reverse genetics system for PRRSV; infectious chimeric PRRSV viruses generated through DNA shuffling; modified live- attenuated virus vaccines (MLV) using DNA shuffled chimeric viruses; chimeric viral proteins produced through shuffled chimeric viruses; PRRSV antigens and subunit vaccines based on shuffled chimeric viral proteins; and method of producing broadly protective PRRSV vaccines using DNA shuffling techniques.Type: ApplicationFiled: June 2, 2011Publication date: June 6, 2013Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.Inventors: Yanyan Ni, Yao-Wei Huang, Xiang-Jin Meng
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Patent number: 8415118Abstract: The present invention relates to the cloning, identification and characterization of the unique and entire genomic sequences encoding new porcine DC-SIGN and LSECtin proteins, including the novel nucleotide sequences of the full-length cDNA and genes of both pDC-SIGN gene and pLSECtin. Also provided are the nucleic acid molecules encoding newly discovered porcine ICAM-3 isoforms from porcine monocyte-derived dendritic cells and the use thereof. Specifically, the invention is drawn to an isolated nucleic acid molecule comprising a nucleotide sequence encoding one or more of porcine DC-SIGN, porcine ICAM-3, porcine LSECtin, a complement of the nucleotide sequence or a functional, defined portion of the nucleotide sequence or a protein fusion product linked to a protein that may be of porcine or human origin.Type: GrantFiled: October 29, 2008Date of Patent: April 9, 2013Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Yaowei Huang, Xiang-Jin Meng
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Publication number: 20110280905Abstract: The present invention provides a novel chimeric porcine circovirus infectious DNA clone and live attenuated chimeric virus with the PCV2, preferably of subtype PCV2b, capsid gene integrated into a non-pathogenic PCV1 virus genome. In a particular embodiment, the PCV2 capids gene is of subtype PCV2b, the predominant subtype circulating in pigs worldwide. The attenuated chimeric virus, designated PCV1-2b, effectively protects pigs from PCV2b challenges, and can be used as a live vaccine, as well as an inactivated (killed) vaccine, that provides protection and cross protection against PCV2b and PCV2a subtypes infection. The live attenuated vaccine of the present invention is also effective protecting pigs from porcine circovirus-associated disease (PCVAD).Type: ApplicationFiled: March 16, 2011Publication date: November 17, 2011Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.Inventors: XIANG-JIN MENG, NATHAN M. BEACH, SHEELA RAMAMOORTHY
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Patent number: 8058048Abstract: The present invention relates to infectious DNA clones, infectious chimeric DNA clones of porcine circovirus (PCV), vaccines and means of protecting pigs against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2. The new chimeric infectious DNA clone and its derived, avirulent chimeric virus are constructed from the nonpathogenic PCV1 in which the immunogenic ORF gene of the pathogenic PCV2 replaces a gene of the nonpathogenic PCV1, preferably in the same position. The chimeric virus advantageously retains the nonpathogenic phenotype of PCV1 but elicits specific immune responses against the pathogenic PCV2. The invention further embraces the immunogenic polypeptide expression products. In addition, the invention encompasses two mutations in the PCV2 immunogenic capsid gene and protein, and the introduction of the ORF2 mutations in the chimeric clones.Type: GrantFiled: August 11, 2009Date of Patent: November 15, 2011Assignees: Virginia Tech Intellectual Properties, Inc., Iowa State University Research Foundation, Inc.Inventors: Xiang-Jin Meng, Martijn Fenaux, Patrick G. Halbur
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Publication number: 20110045019Abstract: The present invention provides four purified preparation containing a polynucleic acid molecule encoding porcine Torque teno virus (PTTV) genotypes or subtypes PTTV1a-VA, PTTV1b-VA, PTTV2b-VA, and PTTV2c-VA. The present invention also provides infectious DNA clones, biologically functional plasmid or viral vector containing the infectious nucleic acid genome molecule of the same. The present invention further provides live, attenuated, vector-expressed and purified recombinant capsid subunit or killed viral vaccines for protection against PTTV infection. The present invention additionally provides subunit vaccines comprising PTTV specific gene products, especially ORF1 capsid gene product for protection against PTTV infection. Further, the present invention provides methods for diagnosing PTTV infection via polymerase chain reaction (PCR) using specific primer for PTTV1, PTTV2, and individual PTTV1 genotypes.Type: ApplicationFiled: August 23, 2010Publication date: February 24, 2011Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.Inventors: XIANG-JIN MENG, YAOWEI HUANG
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Publication number: 20110027312Abstract: The present invention relates to a novel chimeric nucleic acid molecule of porcine circovirus (PCV2Gen-1Rep) that embraces a nucleic acid molecule encoding porcine circovirus type 2 (PCV2) which contains a nucleic acid sequence encoding a Rep protein of porcine circovirus type 1 (PCV1), particularly wherein the nucleic acid sequence encoding the Rep protein of PCV1 GO is an open reading frame (ORF) gene and, more particularly, wherein the ORF Rep gene is ORF1. A highly desirable chimeric nucleic acid molecule is constructed by replacing the ORF1 Rep gene of PCV2 by the ORF1 Rep gene of PCV1.Type: ApplicationFiled: April 8, 2009Publication date: February 3, 2011Inventors: Nicole M. Juhan, Xiang-Jin Meng
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Publication number: 20100317054Abstract: The present invention relates to the cloning, identification and characterization of the unique and entire genomic sequences encoding new porcine DC-SIGN and LSECtin proteins, including the novel nucleotide sequences of the full-length cDNA and genes of both pDC-SIGN gene and pLSECtin. Also provided are the nucleic acid molecules encoding newly discovered porcine ICAM-3 isoforms from porcine monocyte-derived dendritic cells and the use thereof. Specifically, the invention is drawn to an isolated nucleic acid molecule comprising a nucleotide sequence encoding one or more of porcine DC-SIGN, porcine ICAM-3, porcine LSECtin, a complement of the nucleotide sequence or a functional, defined portion of the nucleotide sequence or a protein fusion product linked to a protein that may be of porcine or human origin.Type: ApplicationFiled: October 29, 2008Publication date: December 16, 2010Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.Inventors: Yaowei Huang, Xiang-Jin Meng
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Patent number: 7842298Abstract: The present invention relates to a novel isolated avian hepatitis E virus having a nucleotide sequence set forth in SEQ ID NO:1 or its complementary strand. The invention further concerns immunogenic compositions comprising this new virus or recombinant products such as the nucleic acid and vaccines that protect an avian or mammalian species from viral infection or hepatitis-splenomegaly syndrome caused by the hepatitis E virus. Also included in the scope of the invention is a method for propagating, inactivating or attenuating a hepatitis E virus comprising inoculating an embryonated chicken egg with a live, pathogenic hepatitis E virus and recovering the virus or serially passing the pathogenic virus through additional embryonated chicken eggs until the virus is rendered inactivated or attenuated.Type: GrantFiled: July 22, 2009Date of Patent: November 30, 2010Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Xiang-Jin Meng, Gholamreza Haqshenas, Fang-Fang Huang
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Publication number: 20100055122Abstract: The present invention relates to infectious DNA clones, infectious chimeric DNA clones of porcine circovirus (PCV), vaccines and means of protecting pigs against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2, The new chimeric infectious DNA clone and its derived, avirulent chimeric virus are constructed from the nonpathogenic PCV1 in which the immunogenic ORF gene of the pathogenic PCV2 replaces a gene of the nonpathogenic PCV1, preferably in the same position. The chimeric virus advantageously retains the nonpathogenic phenotype of PCV1 but elicits specific immune responses against the pathogenic PCV2. The invention further embraces the immunogenic polypeptide expression products. In addition, the invention encompasses two mutations in the PCV2 immunogenic capsid gene and protein, and the introduction of the ORF2 mutations in the chimeric clones.Type: ApplicationFiled: August 11, 2009Publication date: March 4, 2010Inventors: Xiang-Jin Meng, Martijn Fenaux, Patrick G. Halbur
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Publication number: 20100034845Abstract: The present invention relates to a novel isolated avian hepatitis E virus having a nucleotide sequence set forth in SEQ ID NO:1 or its complementary strand. The invention further concerns immunogenic compositions comprising this new virus or recombinant products such as the nucleic acid and vaccines that protect an avian or mammalian species from viral infection or hepatitis-splenomegaly syndrome caused by the hepatitis E virus. Also included in the scope of the invention is a method for propagating, inactivating or attenuating a hepatitis E virus comprising inoculating an embryonated chicken egg with a live, pathogenic hepatitis E virus and recovering the virus or serially passing the pathogenic virus through additional embryonated chicken eggs until the virus is rendered inactivated or attenuated.Type: ApplicationFiled: July 22, 2009Publication date: February 11, 2010Applicant: Virginia Tech Intellectual Properties, Inc.,Inventors: Xiang-Jin Meng, Gholamreza Haqshenas, Fang-Fang Huang
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Patent number: 7582303Abstract: The present invention relates to a novel isolated avian hepatitis E virus having a nucleotide sequence set forth in SEQ ID NO:1 or its complementary strand. The invention further concerns immunogenic compositions comprising this new virus or recombinant products such as the nucleic acid and vaccines that protect an avian or mammalian species from viral infection or hepatitis-splenomegaly syndrome caused by the hepatitis E virus. Also included in the scope of the invention is a method for propagating, inactivating or attenuating a hepatitis E virus comprising inoculating an embryonated chicken egg with a live, pathogenic hepatitis E virus and recovering the virus or serially passing the pathogenic virus through additional embryonated chicken eggs until the virus is rendered inactivated or attenuated.Type: GrantFiled: July 19, 2005Date of Patent: September 1, 2009Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Xiang-Jin Meng, Gholamreza Haqshenas, Fang-Fang Huang
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Patent number: 7575752Abstract: The present invention relates to infectious DNA clones, infectious chimeric DNA clones of porcine circovirus (PCV), vaccines and means of protecting pigs against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2. The new chimeric infectious DNA clone and its derived, avirulent chimeric virus are constructed from the nonpathogenic PCV1 in which the immunogenic ORF gene of the pathogenic PCV2 replaces a gene of the nonpathogenic PCV1, preferably in the same position. The chimeric virus advantageously retains the nonpathogenic phenotype of PCV1 but elicits specific immune responses against the pathogenic PCV2. The invention further embraces the immunogenic polypeptide expression products. In addition, the invention encompasses two mutations in the PCV2 immunogenic capsid gene and protein, and the introduction of the ORF2 mutations in the chimeric clones.Type: GrantFiled: August 15, 2007Date of Patent: August 18, 2009Assignees: Virginia Tech Intellectual Properties, Inc., Iowa State University Research Foundation, Inc.Inventors: Xiang-Jin Meng, Martijn Fenaux, Patrick G. Halbur
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Patent number: 7517976Abstract: The present invention provides a purified preparation containing a polynucleic acid encoding at least one polypeptide selected from the group consisting of proteins encoded by one or more open reading frames (ORF's) of an Iowa strain of porcine reproductive and respiratory syndrome virus (PRRSV), proteins at least 80% but less than 100% homologous with those encoded by one or more of ORF 2, ORF 3, ORF 4 and ORF 5 of an Iowa strain of PRRSV, proteins at least 97% but less than 100% homologous with proteins encoded by one or both of ORF 6 and ORF 7 of an Iowa strain of PRRSV, antigenic regions of such proteins which are at least 5 amino acids in length and which effectively stimulate immunological protection in a porcine host against a subsequent challenge with a PRRSV isolate, and combinations thereof, in which amino acids non-essential for antigenicity may be conservatively substituted.Type: GrantFiled: March 8, 2006Date of Patent: April 14, 2009Assignees: Iowa State University Research Foundation, Inc., Wyeth Holding CorporationInventors: Prem S. Paul, Xiang-Jin Meng, Patrick Halbur, Igor Morozov, Melissa A. Lum
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Publication number: 20080226666Abstract: The present invention relates to infectious DNA clones, infectious chimeric DNA clones of porcine circovirus (PCV), vaccines and means of protecting pigs against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2. The new chimeric infectious DNA clone and its derived, avirulent chimeric virus are constructed from the nonpathogenic PCV1 in which the immunogenic ORF gene of the pathogenic PCV2 replaces a gene of the nonpathogenic PCV1, preferably in the same position. The chimeric virus advantageously retains the nonpathogenic phenotype of PCV1 but elicits specific immune responses against the pathogenic PCV2. The invention further embraces the immunogenic polypeptide expression products. In addition, the invention encompasses two mutations in the PCV2 immunogenic capsid gene and protein, and the introduction of the ORF2 mutations in the chimeric clones.Type: ApplicationFiled: August 15, 2007Publication date: September 18, 2008Applicants: Virginia Tech Intellectual Properties, Inc., Iowa State University Research Foundation, Inc.Inventors: Xiang-Jin Meng, Martijn Fenaux, Patrick G. Halbur
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Publication number: 20070269445Abstract: The present invention provides a purified preparation containing a polynucleic acid encoding at least one polypeptide selected from the group consisting of proteins encoded by one or more open reading frames (ORF's) of an Iowa strain of porcine reproductive and respiratory syndrome virus (PRRSV), proteins at least 80% but less than 100% homologous with those encoded by one or more of ORF 2, ORF 3, ORF 4 and ORF 5 of an Iowa strain of PRRSV, proteins at least 97% but less than 100% homologous with proteins encoded by one or both of ORF 6 and ORF 7 of an Iowa strain of PRRSV, antigenic regions of such proteins which are at least 5 amino acids in length and which effectively stimulate immunological protection in a porcine host against a subsequent challenge with a PRRSV isolate, and combinations thereof, in which amino acids non-essential for antigenicity may be conservatively substituted.Type: ApplicationFiled: March 8, 2006Publication date: November 22, 2007Inventors: Prem Paul, Xiang-Jin Meng, Patrick Halbur, Igor Morozov, Melissa Lum
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Patent number: 7279166Abstract: The present invention relates to infectious DNA clones, infectious chimeric DNA clones of porcine circovirus (PCV), vaccines and means of protecting pigs against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2. The new chimeric infectious DNA clone and its derived, avirulent chimeric virus are constructed from the nonpathogenic PCV1 in which the immunogenic ORF gene of the pathogenic PCV2 replaces a gene of the nonpathogenic PCV1, preferably in the same position. The chimeric virus advantageously retains the nonpathogenic phenotype of PCV1 but elicits specific immune responses against the pathogenic PCV2. The invention further embraces the immunogenic polypeptide expression products. In addition, the invention encompasses two mutations in the PCV2 immunogenic capsid gene and protein, and the introduction of the ORF2 mutations in the chimeric clones.Type: GrantFiled: March 25, 2004Date of Patent: October 9, 2007Assignees: Virginia Tech Intellectual Properties, Inc., Iowa State University Research Foundation, Inc.Inventors: Xiang-Jin Meng, Martijn Fenaux, Patrick G. Halbur
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Patent number: 7276353Abstract: The present invention relates to infectious DNA clones, infectious chimeric DNA clones of porcine circovirus (PCV), vaccines and means of protecting pigs against viral infection or postweaning multisystemic wasting syndrome (PMWS) caused by PCV2. The new chimeric infectious DNA clone and its derived, avirulent chimeric virus are constructed from the nonpathogenic PCV1 in which the immunogenic ORF gene of the pathogenic PCV2 replaces a gene of the nonpathogenic PCV1, preferably in the same position. The chimeric virus advantageously retains the nonpathogenic phenotype of PCV1 but elicits specific immune responses against the pathogenic PCV2. The invention further embraces the immunogenic polypeptide expression products.Type: GrantFiled: December 9, 2002Date of Patent: October 2, 2007Assignees: Virginia Tech Intellectual Properties, Inc., Iowa State University Research Foundation, Inc.Inventors: Xiang-Jin Meng, Martijn Fenaux, Patrick G. Halbur
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Patent number: 7264957Abstract: The present invention provides a purified preparation containing a polynucleic acid encoding at least one polypeptide selected from the group consisting of proteins encoded by one or more open reading frames (ORF's) of an Iowa strain of porcine reproductive and respiratory syndrome virus (PRRSV), proteins at least 80% but less than 100% homologous with those encoded by one or more of ORF 2, ORF 3, ORF 4 and ORF 5 of an Iowa strain of PRRSV, proteins at least 97% but less than 100% homologous with proteins encoded by one or both of ORF 6 and ORF 7 of an Iowa strain of PRRSV, antigenic regions of such proteins which are at least 5 amino acids in length and which effectively stimulate immunological protection in a porcine host against a subsequent challenge with a PRRSV isolate, and combinations thereof, in which amino acids non-essential for antigenicity may be conservatively substituted.Type: GrantFiled: July 15, 2003Date of Patent: September 4, 2007Assignees: Wyeth, Iowa State University Research Foundation, Inc.Inventors: Prem S. Paul, Xiang-Jin Meng, Patrick Halbur, Igor Morozov, Melissa A. Lum