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Gene-modified non-human animal expressing human gpc3 polypeptide

a technology of gpc3 and non-human animals, which is applied in the field of gene-modified non-human animals expressing a human gpc3 polypeptide, can solve the problems of difficult regulation of expression, difficult substitution in the region, and no generally effective method for producing non-human animals

Active Publication Date: 2020-07-23
CHUGAI PHARMA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]Furthermore, the present inventors have discovered that the non-human animals which are deficient in expression of the non-human animal endogenous GPC3 polypeptide and capable of expressing a human GPC3 polypeptide at a physiologically adequate level show immune tolerance to human GPC3. That is, the use of the non-human animals as models enables accurate and convenient evaluation of test substances for their safety, therapeutic effects on diseases, pharmacokinetics, in vivo distribution, and such. Furthermore, by using this evaluation system, antibodies having a desired activity can be developed efficiently.

Problems solved by technology

So far, methods for substituting a human genomic gene for a homologous mouse gene have been reported, but the expression level of the substituting human gene is lower than the expression level of the homologous mouse gene, and the expression is difficult to be regulated (Non-patent Document 1).
However, when the length of the gene exceeds hundreds kilobases, substitution in the region is difficult (Non-patent Document 5).
Thus, there has been no generally effective method for producing non-human animals that suppresses expression of the non-human animal endogenous gene and is capable of expressing a foreign gene at a physiologically adequate level.

Method used

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  • Gene-modified non-human animal expressing human gpc3 polypeptide
  • Gene-modified non-human animal expressing human gpc3 polypeptide
  • Gene-modified non-human animal expressing human gpc3 polypeptide

Examples

Experimental program
Comparison scheme
Effect test

example 1

n of Human GPC3 Knock-in Mouse

(1) Construction of Knock-in Vector

[0287]For hGPC3 knock-in (hGPC3KI) vector ver. 1, an artificial chromosome (bacterial artificial chromosome (BAC)) clone was used, into which the genomic region of the mouse glypican-3 gene (mGpc3) was cloned. The coding sequence (SEQ ID NO: 10) of the human glypican-3 gene (hGpc3), an hp7 sequence (SEQ ID NO: 11), a polyadenylation signal (SEQ ID NO: 12), loxP sequences (SEQ ID NO: 7), and a neomycin resistance (neo) gene (SEQ ID NO: 13) were introduced to the target region of the Gpc3 gene on the BAC clone through homologous recombination using Red / ET System (Gene Bridge). In the introducing, the translation initiation site of hGPC3 was inserted such that it comes to the very position where the translation initiation site of mGpc3 was. The construct of the vector is shown in FIG. 1(2).

[0288]For hGPC3KI vector ver. 2, the approximately 800-bp 5′ upstream region of the mGpc3 gene target region; the mouse beta globin se...

example 2

n Analyses of hGPC3KI Mice

(1) Confirmation of Protein Expression

[0305]Expression of each GPC3 protein was confirmed by Western blotting using lung lysates of hGPC3KI mice and wild-type mice. The lung lysates of hGPC3KI mice and wild-type mice were prepared from one of the two lungs. To prepare samples for SDS-PAGE, a sample buffer (nacalai, catalogue no.) was added to each lung lysate, then heated at 95° C. for five minutes, and diluted to adjust the total amount of protein per lane to 50 μg to 450 μg. After fractionation by SDS-PAGE, proteins were transferred to a membrane. Detection was carried out by using an anti-human GPC3 antibody as the primary antibody, and an HRP-labeled anti-human IgG antibody as the secondary antibody. Tubulin alpha was used as the internal standard of the lysate, and detected using an anti-tubulin alpha antibody as the primary antibody, and an HRP-labeled anti-rat IgG antibody as the secondary antibody.

[0306]For hGPC3KI mice ver. 1, hGPC3 protein signal ...

example 3

lerance to a Human GPC3 Polypeptide

(1) Antigen Immunization

[0315]A soluble human GPC3 protein mixed with an adjuvant (Gerbu adjuvant 10, manufactured by Gerbu GmbH) was administered subcutaneously at 0.1 mg / 0.1 mL to hGPC3KI mice ver. 3 and wild-type mice. The day of first administration was defined as day 0, and the administration was carried out on days 14, 21, 28, 35, 42, 49, and 56. The soluble human GPC3 protein was produced according to a method known to those skilled in the art.

(2) Measurement of Antibody Titer

[0316]The day of first administration was defined as day 0, and blood was collected with heparin treatment before each administration to obtain plasma. Concentration of the anti-human GPC3 antibody in plasma was measured by enzyme linked immunosorbent assay (ELISA) where a soluble human GPC3 (shGPC3) was coated. Coating was carried out using 4 μg / mL shGPC3 solution (pH9.6) on a 96-well plate. Each of the wells was washed with a PBS solution containing 0.05% tween20, and...

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Abstract

Genetically modified non-human animals which are deficient in expression of an endogenous GPC3 polypeptide and express a human GPC3 polypeptide at a physiologically adequate level; methods for producing the non-human animals; and methods for evaluating test substances using the non-human animals. Furthermore, methods for evaluating test substances regarding their safety, therapeutic effects on diseases, pharmacokinetics, in vivo distribution, and such, using the non-human animals as models.

Description

TECHNICAL FIELD[0001]The present invention relates to genetically modified non-human animals expressing a human GPC3 polypeptide and methods for evaluating compounds by using the genetically modified non-human animals expressing the human GPC3 polypeptide.BACKGROUND ART[0002]Recently, many therapeutic agents with high specificity to molecular targets, such as therapeutic antibodies, have been developed, and to appropriately carry out preclinical evaluation on them, there is an increasing demand for humanized non-human animals such as humanized mice. Methods for preparing humanized mice include gene targeting methods in which a mouse gene is substituted with a human gene. So far, methods for substituting a human genomic gene for a homologous mouse gene have been reported, but the expression level of the substituting human gene is lower than the expression level of the homologous mouse gene, and the expression is difficult to be regulated (Non-patent Document 1). When a coding sequenc...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01K67/027G01N33/50C12N15/85C07K16/28C07K16/30
CPCG01N33/5041A01K2217/052A01K2227/105C07K2317/31A01K2217/206A01K67/0278C12N2015/8518C07K16/2809C07K16/303G01N33/5088C12N15/85C12N5/10A61K2039/505A01K2217/072C07K14/705
Inventor JISHAGE, KOICHIHINO, HIROSHIISHIGURO, TAKAHIROKINOSHITA, YASUKO
Owner CHUGAI PHARMA CO LTD
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