Riken Corporation

Chiome Bioscience Inc.

Japan Science and Technology Agency

Yokohama City University

Chiome Beoscience Inc.

Yokohama City University and Chiome Bioscience Inc.

Hidetaka Seo

Takehiko Shibata

Kunihiro Ohta

Shuichi Hashimoto

Koji Murakami

Yoshio Goshima

Naoya Yamashita

Fumio Nakamura

Naoki Takahashi

Yukie Sasakura

Isao Kohno

Kouji Hirota

Shu-ichi Hashimoto

Donghui Li

Shoko Ishida

Chika Koyama

Yukiko Banzai

Naoto Harigai

The present invention mainly addresses the problem of providing an antibody against semaphorin 3A protein, said antibody enabling effective prevention and/or treatment of a disease, in which Sema 3A protein participates, such as a neurodegenerative disease, autoimmune disease, inflammatory disease, cancer, infectious disease, etc. or disseminated intravascular coagulation syndrome. An anti-Sema 3A antibody comprising CDRs having specific amino acid sequences (SEQ ID NOS: 1-6, 60-62, 64-66, 68-70, 72-74, 76-78, 80-82, 84-86 and 88-90) enables effective prevention and/or treatment of a disease, in which Sema 3A protein participates, such as a neurodegenerative disease, autoimmune disease, inflammatory disease, cancer, infectious disease, etc. or disseminated intravascular coagulation syndrome and, therefore, remarkably ameliorates symptoms associated with such a disease.

Anti-semaphorin 3A antibody and treatment of Alzheimer's disease and inflammatory immune diseases using same

The present invention provides a method for obtaining diverse novel genes by inducing somatic cell homologous recombination at genetic loci in somatic cells. By controlling transcription activity of a gene that exists at a genetic locus in a eukaryotic organism cell wherein DNA homologous recombination is occurring at an arbitrary genetic locus, somatic cell homologous recombination is induced between said gene and a gene having a DNA sequence similar to said gene that exists in a region upstream of a transcription promoter, whereby it is possible to obtain diverse novel genes having a plurality of genetic information.

Method of inducing homologous recombination of somatic cell

Disclosed is a method for producing an antibody directed against a protein, particularly a transmembrane protein, expressed on the surfaces of cells. Specifically disclosed is a means for obtaining a desired antibody by mixing cells capable of expressing an antigen protein on the surfaces thereof (i.e., antigen molecule-expressing cells) with an antibody library composed of antibody-expressing cells, viruses or the like, and subsequently concentrating/isolating only components (e.g., antibody-expressing cells, viruses) capable of binding to the antigen molecule-expressing cells from the components (e.g., antibody-expressing cells, viruses) of the antibody library.

Method for producing antibody directed against protein expressed on cell surface

The present invention provides a novel method for obtaining diverse antibodies as a result of markedly enhancing the somatic homologous recombination at an antibody locus in immunocytes. By putting immunocytes in which DNA homologous recombination is occurring at an antibody locus (for example, DT40 cells and the like) into contact and the like with histone acetylase inhibitor and the like (for example, trichostatin A and the like), thereby relaxing the chromatin structure at said antibody locus, somatic homologous recombination at an antibody locus is enhanced, and the production of diverse antibody molecules is made possible. The production of antibodies that bind specifically to antigens from cell populations in which the antibody molecules have been diversified by the enhancement of somatic homologous recombination is made possible by using an appropriate selection method (for example, beads coated with antigen and the like).

Method of enhancing homologous recombination of somatic cells and method of constructing specific antibody

The present invention relates to a method for increasing genetic recombination frequency in a genomic DNA and a method for inducing genome rearrangement. Specifically, according to the present invention there are provided: the method for increasing genetic recombination frequency in a cell in which genetic recombination takes place at any sites in the genome, comprising causing a restriction enzyme to be expressed in the cell, inducing transient activation of the restriction enzyme, and then introducing 2 or more double strand cleavages into any genomic DNA of the cell, so as to increase the genetic recombination frequency; the method for inducing genome rearrangement through the use of the above method; and cells each prepared through the use of the above 2 methods.

Method of inducing genome reorganization via intracellular activation of thermostable multifrequency DNA-cleaving enzyme

Growing community of inventors

Tokyo, Japan

Hidetaka Seo