Isolation of biological materials using magnetic particles
First Claim
1. A method for the magnetic labelling of a chromosome or chloroplast cellular component comprising the following steps:
- (a) binding said cellular component to a binding composition comprised of an antibody or nucleic acid in the case of chromosome isolation, or antibody in the case of chloroplast isolation; and
(b) labelling said binding composition with magnetic particles having an average diameter less than about 2 μ
m.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for the isolation and sorting of biological materials has been developed. Biological material includes chromosomes, segments of chromosomes, cell organelles, or other minute cellular components. The biological material is separated from the cellular milieu, if necessary, and anchored to a support. Example of a support are glass coverslips, glass or polymer beads. The anchoring is by means of a reversible cross-linking system. The supported biological material is then labelled with compositions capable of binding to said material, and with magnetic particles. Examples of the binding material include nucleic acid probes and antibodies. An example of the antibodies would be those directed to histones. Other labels, for example, fluoresceinbiotin-avidin may be used. The material may be released from the support and sorted by a magnetic force. This method is an alternative to flow cytometry and presents numerous advantages in terms of time, resolution, purity, and preservation of the structure of the biological material during isolation and separation.
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Citations
31 Claims
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1. A method for the magnetic labelling of a chromosome or chloroplast cellular component comprising the following steps:
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(a) binding said cellular component to a binding composition comprised of an antibody or nucleic acid in the case of chromosome isolation, or antibody in the case of chloroplast isolation; and (b) labelling said binding composition with magnetic particles having an average diameter less than about 2 μ
m. - View Dependent Claims (19)
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2. A method for the isolation of a chromosome or chloroplast cellular component comprising the following steps:
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(a) reversibly anchoring said cellular component to a support with a DTSSP or SPDP linker; (b) binding said cellular component to a binding composition comprised of an antibody in the case of chromosome or chloroplast isolation, or nucleic acid in the case of chromosome isolation; (c) labelling said binding composition with magnetic particles having an average diameter less than about 2 μ
m;(d) releasing said cellular component from the support to form free, magnetized cellular components; and (e) isolating said cellular component by applying a magnetic force to said free, magnetized cellular components. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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21. A method of separating a chromosome or chloroplast cellular component comprising the following steps:
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(a) binding a supported, cellular component to a binding composition comprised of an antibody in the case of chromosome or chloroplast isolation, or nucleic acid in the case of chromosome isolation; (b) labelling said bound cellular component with a magnetic particle having an average diameter of less than about 2 μ
m; and(c) magnetically separating the resulting labelled cellular component. - View Dependent Claims (22, 23, 24, 25)
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26. A method of sorting chromosomes to achieve purified suspensions thereof, said method comprising the following:
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(a) anchoring the chromosomes to a support by means of a disulfide-containing bifunctional reversible linker; (b) hybridizing the supported chromosomes with a binding nucleic acid or antibody binding composition to form a complex; (c) labelling the complex with magnetic particles having an average diameter less than about 2 μ
m;(d) releasing the complex from the support; and (e) sorting the released chromosomes by means of a magnetic force. - View Dependent Claims (27, 28)
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29. A method of sorting chromosomes to achieve purified preparations thereof, said method comprising the following steps:
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(a) anchoring the chromosomes to a support by means of a reversible DTSSP or SPDP linker; (b) hybridizing the supported chromosomes with a binding composition comprised of an antibody or nucleic acid to form a complex; (c) labelling the complex with a magnetic label; (d) releasing the complex from the support; and (e) sorting the released chromosomes by means of said magnetic label. - View Dependent Claims (30, 31)
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Specification