摘要:
Methods and compositions for the treatment of hypoxia associated disorders by directional angiogenesis/arteriogenesis. Conditionally silenced vectors expressing a therapeutic molecule under hypoxic conditions avoid chaotic vascularization and allow for the orderly growth of new vessels into damaged tissue.
摘要:
Methods and compositions for reducing expression of genes on Chromosome 21 (“Chr 21”) by targeting an XIST transgene to the Dual specificity tyrosine-phosphorylation-regulated kinase 1A (DYRK1A) gene or a Regulator of calcineurin 1 (RCAN1) gene, and cells and transgenic animals comprising an XIST transgene inserted into a DYRK1A or RCAN1 allele, e.g., cells and animals trisomic for human Chr 21 and mouse Chr 16.
摘要:
A modification of the existing INSM1 promoter region has been discovered that incorporated DNA elements that silence expression of neuronal genes in non-neuronal cells and that has increased the effectiveness and safety of using the INSM1 promoter for tumor treatment. One modification was addition of one or two tandem copies of neuronal restrictive silencer elements (NRSEs) derived either from the mouse nicotinic acetylcholine receptor (nAChR) or the rat superior cervical ganglion 10 (SCG10) promoters. These NRSEs were placed in the expression construct either directly upstream or downstream of the INSM1 promoter sequence. The most effective expression construct was the nAChR NRSE element positioned downstream of the INSM1 promoter. This expression construct increased the tissue specificity of the INSM1 promoter without a significant decrease in its activity. In addition, the modified INSM1 promoter was placed into a viral vector, adenovirus 5. Constructs with an insulator element, the chicken HS4 β-globin insulator element, with the INSM1 promoter was shown to decrease the interference of the viral genome on its expression. Constructs have been made that do not decrease the INSM1 promoter activity but significantly augment the tumor specificity of the promoter. Linking the construct to a reporter gene allowed for detection of the placement of the viral vector, and this detection can be used for diagnosing or locating neuroendocrine tumors.
摘要:
The invention generally relates to targeted gene therapy using recombinant vectors and particularly adenovirus vectors. The invention specifically relates to replication-conditional vectors and methods for using them. Such vectors are able to selectively replicate in a target tissue to provide a therapeutic benefit from the presence of the vector per se or from heterologous gene products expressed from the vector and distributed throughout the tissue. In such vectors, a gene essential for replication is placed under the control of a heterologous tissue-specific transcriptional regulatory sequence. Thus, replication is conditioned on the presence of a factor(s) that induces transcription or the absence of a factor(s) that inhibits trancription of the gene by means of the transcriptional regulatory sequence with this vector; therefore, a target tissue can be selectively treated.
摘要:
Transgenic animals carrying a transgene comprising a nucleic acid molecule encoding protein useful for regulating the expression of genes in eukaryotic cells and organisms in a highly controlled manner are disclosed. In the regulatory system of the invention, transcription of a tet operator-linked nucleotide sequence is inhibited by a transcriptional inhibitor fuision protein composed of two polypeptides, a first polypeptide which binds to tet operator sequences and a second polypeptide which directly or indirectly inhibits transcription in eukaryotic cells. In various embodiment, the first polypeptide binds to tet operator sequences either: (i) in the absence but not the presence of tetracycline (or an analogue thereof) or (ii) in the presence but not the absence of tetracycline (or an analogue thereof). In a preferred embodiment, the transgene encoding the transcriptional inhibitor fusion protein is integrated at a predetermined location within the chromosome of the transgenic animal.
摘要:
The present invention concerns methods and reagents useful in modulating hepatitis B virus (HBV) gene expression in a variety of applications, including use in therapeutic, diagnostic, target validation, and genomic discovery applications. Specifically, the invention relates to short interfering nucleic acid (siNA) or short interfering RNA (siRNA) molecules capable of mediating RNA interference (RNAi) against against hepatitis B virus (HBV).
摘要:
The present invention is a novel method of expressing transgenes in vivo by targeting protected transgene cassettes into predetermined loci, including ubiquitously expressed chromosomal loci, such that the activity of an exogenous promoter is maintained. The advantages of this method are that the expression pattern is determined primarily by the nature of the exogenous promoter and, therefore, is not subject to positional effects. The invention also encompasses the DNA targeting vectors, the targeted cells, as well as non-human organisms, especially mice, created from the targeted cells.
摘要:
The invention relates to a recombinantvector for the cloning and/or expression and/or transfer of an exogenous nucleotide sequence characterized in that it consists of any sequence contained in the ClaI—PvuII fragment comprising nucleotides 7702 to 1527 of the sequence given in FIG. 1 and comprising the LTR sequence included between nucleotides 7842 and 144, the PBS site starting at nucleotides 145, the packaging sequence included in the sequences of 250 nucleotides following the end of the LTR sequence, the said sequence being capable of controlling the cloning and/or expression and/or transfer of the exogenous sequence whatever its transcriptional orientation with respect to the transcriptional orientation of the virus. It relates to the use of this vector for the transfer and/or cloning and/or expression of genes, in particular in the contest of gene therapy.
摘要:
Methods of regulating gene expression in subjects using tetracycline-responsive fusion proteins are disclosed. In one embodiment, the method involves introducing into a cell the subject a nucleic acid molecule encoding a fusion protein which inhibits transcription, the fusion protein comprising a first polypeptide which binds to a tet operator sequence, operatively linked to a heterologous second polypeptide which inhibits transcription in eukaryotic cells; and modulating the concentration of a tetracycline, or analogue thereof, in the subject. The first polypeptide can binds to a tet operator sequence in the absence, but not the presence, of tetracycline. Alternatively, the first polypeptide can binds to a tet operator sequence in the presence, but not the absence, of tetracycline. In another embodiment, the method of the invention involves obtaining a cell from a subject, introducing into the cell a first nucleic acid molecule which operatively links a gene to at least one tet operator sequence, introducing into the cell a second nucleic acid molecule encoding an inhibitory fusion protein of the invention to form a modified cell, administering the modified cell to the subject and modulating the concentration of a tetracycline, or analogue thereof, in the subject. The first and second nucleic acid molecules can be linked or can be separate molecules.
摘要:
Methods and compositions for the treatment of hypoxia associated disorders by directional angiogenesis/arteriogenesis. Conditionally silenced vectors expressing a therapeutic molecule under hypoxic conditions avoid chaotic vascularization and allow for the orderly growth of new vessels into damaged tissue.