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Gene therapy medicament for Leber congenital amaurosis

A gene drug, gene technology, applied in gene therapy, drug combination, genetic engineering and other directions, can solve problems such as vision loss and rhodopsin content reduction

Active Publication Date: 2018-06-01
BEIJING GENECRADLE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The RPE65 gene mutation leads to a decrease in the content of rhodopsin in the retina, which is equivalent to the retina being in a dark environment for a long time, resulting in vision loss

Method used

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  • Gene therapy medicament for Leber congenital amaurosis
  • Gene therapy medicament for Leber congenital amaurosis
  • Gene therapy medicament for Leber congenital amaurosis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1 Plasmid vector construction

[0069] In order to construct the pscAAV-EGFP and pscAAV-RPE65 plasmids required for packaging the recombinant double-stranded AAV virus, we first constructed the pscAAV vector based on the pAAV2neo preserved by the company. Specifically, based on the left ITR sequence in the AAV2 genome (GenBank No.AF043303), the trs sequence and the D sequence in the ITR sequence were deleted according to literature reports (WangZ, et al . Rapid and highly efficient transduction by double-stranded adeno-associated virus vectors in vitro and in vivo. Gene Ther . 2003; 10(26): 2105-2111.), and obtained the ΔITR sequence (SEQ ID No.12). In order to facilitate the cloning operation, the sequence between 1392-1668bp in the pAAV2neo vector (the sequence between the ITR near the BGH polyA and the ApaI restriction site) was fused with the ΔITR sequence to obtain the fusion sequence. After adding BamHI and ApaI restriction sites at both ends of the fus...

Embodiment 2

[0083] Example 2 Preparation and assay of recombinant AAV virus

[0084] References (Xiao X, et al . Production of High-Titer Recombinant Adeno-Associated Virus Vectors in the Absence of Helper Adenovirus. J Virol . 1998; 72(3): 2224-2232.), using the three-plasmid packaging system to package and purify recombinant AAV virus. Briefly, the AAV vector plasmid (pAAV-EGFP, pAAV-RPE65, pscAAV-EGFP or pscAAV-RPE65), helper plasmid (pHelper) and AAV Rep and Cap protein expression plasmid (pAAV-R2C9) were prepared in a 1:1:1 ratio. After the molar ratio was mixed, HEK293 cells were transfected by the calcium phosphate method. After 48 hours of transfection, the cells and culture supernatant were harvested, and the recombinant AAV virus was isolated and purified by cesium chloride density gradient centrifugation. Four kinds of recombinant viruses such as ssAAV9-EGFP, ssAAV9-RPE65, scAAV9-EGFP or scAAV9-RPE65 were obtained by packaging and purification.

[0085] Quantitative PCR met...

Embodiment 3

[0090] Example 3 Expression of ssAAV9-EGFP and scAAV9-EGFP in mouse retinal pigment epithelial cell layer

[0091] Ten 8-week-old C57BL / 6J mice, half male and half female, were purchased from Beijing Huafukang Biotechnology Co., Ltd., randomly divided into two groups, and bred and raised in an SPF-level experimental animal center. The mice were reared in a 12-hour cycle of day and night, with a relative humidity of 60±10% and a temperature of 22±1ºC. The ssAAV9-EGFP and scAAV9-EGFP viruses were injected by the subretinal method. Each mouse was randomly selected to inject the left eye or the right eye, and the other eye was injected with an equal volume of sterile phosphate buffer as a control, and the injection dose of each eye was 1 μL with a concentration of 1×10 13 vg / ml virus solution. After 2 weeks, the mice were sacrificed, the retinas were separated, and frozen sections were used to observe the expression of green fluorescent protein in the RPE cells of the mice in ea...

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Abstract

The invention provides a gene therapy medicament for specific expression of retinal pigment epithelium 65 (RPE65) of eyes in order to treat Leber congenital amaurosis. A vector contains a CMV enhancer, a promoter of a human RPE65 gene, a human RPE65 gene coding region and an intron composed sequence, and a poly A sequence and an artificially spliced RPE65 gene enhancer. The recombinant vector is mediated by a single chain and / or double chain adeno-associated virus (AAV), including but not limited to 9 type AAV type 9 (AAV9).

Description

technical field [0001] The present invention relates to the field of biotechnology, in particular to an eye-specific RPE65 gene expression vector mediated by a single-chain and / or double-chain AAV9 virus vector and its use, including a composition with the vector, a recombinant expression unit and a gene therapy method . Background technique [0002] Leber congenital amaurosis (Leber congenital amaurosis, LCA) is a genetic retinal disease that causes congenital blindness in both eyes in children, accounting for 10-20% of children's congenital binocular blindness, accounting for 5% of hereditary retinal degeneration diseases (Cremers FP, et al . Molecular genetics of Leber congenital amaurosis. Hum Mol Genet. 2002; 11(10): 1169-1176.). The disease is autosomal recessive, and there are at least 22 known pathogenic genes. Among them, LCA caused by retinal pigment epithelium 65 (retinal pigment epithelium 65, RPE65) gene mutation is called LCA Ⅱ, accounting for about 6 of the ...

Claims

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Application Information

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IPC IPC(8): C12N15/85C12N15/66C12N15/864A61K48/00A61P9/10
CPCA61K48/0066A61K48/0075C12N15/66C12N15/85C12N15/86C12N2750/14143
Inventor 田文洪董小岩吴小兵马思思
Owner BEIJING GENECRADLE PHARM CO LTD
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