Method and apparatus for cleaving deoxyribonucleic acid
First Claim
1. Apparatus for cleaving deoxyribonucleic acid, which comprises:
- (a) a reactor containing a reaction mixture comprising deoxyribonucleic acid which is to be subjected to a chemical modification reaction, whereby at least one base of the deoxyribonucleic acid is chemically modified;
(b) a transfer pump connected by conduit to said reactor for bringing said reaction mixture having undergone a chemical modification reaction into contact with an adsorber;
(c) an adsorber connected by conduit to said transfer pump, said adsorber comprising an adsorbent for adsorbing and retaining the chemically modified deoxyribonucleic acid, said adsorber further comprising washing means for washing the adsorbent with a washing fluid to remove any chemical modification reagents from said adsorbent, said adsorber further comprising eluting means for eluting chemically modified deoxyribonucleic acid from the adsorbent; and
(d) a concentrator connected by conduit to said adsorber for concentrating DNA eluates received from the adsorber, said concentrator further comprising cleavage reagent supplying means for adding cleavage reagent to the concentrator, said concentrator further comprising heating means for heating the cleavage reagent and DNA eluates, whereby the deoxyribonucleic acid is cleaved at the position of the modified base.
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Abstract
The invention relates to a procedure for chemically determining the base sequence of DNA and, in particular, its step of cleaving the labeled DNA having undergone a base-selective chemical modification at the position of the modified base. More particularly, it relates to a method for cleaving DNA which comprises modifying DNA base-selectively with chemical reagents, bringing the resulting reaction mixture into contact with an adsorbent to adsorb the chemically modified DNA on the adsorbent, washing the adsorbent with a washing fluid to remove any chemical modification reagents from the adsorbent, bringing the adsorbent into contact with an eluent to elute the chemically modified DNA adsorbed thereon, concentrating the resulting eluate and then heating it together with a cleavage reagent.
This invention also relates to apparatus for carrying out the above-described method which comprises a reactor 1 for receiving the reaction mixture having undergone a chemical modification reaction of DNA, a transfer pump 4, an adsorber 2 containing an adsorbent, a three-way valve 5 and a concentrator 3, these units being interconnected by conduits in the order mentioned.
21 Citations
19 Claims
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1. Apparatus for cleaving deoxyribonucleic acid, which comprises:
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(a) a reactor containing a reaction mixture comprising deoxyribonucleic acid which is to be subjected to a chemical modification reaction, whereby at least one base of the deoxyribonucleic acid is chemically modified; (b) a transfer pump connected by conduit to said reactor for bringing said reaction mixture having undergone a chemical modification reaction into contact with an adsorber; (c) an adsorber connected by conduit to said transfer pump, said adsorber comprising an adsorbent for adsorbing and retaining the chemically modified deoxyribonucleic acid, said adsorber further comprising washing means for washing the adsorbent with a washing fluid to remove any chemical modification reagents from said adsorbent, said adsorber further comprising eluting means for eluting chemically modified deoxyribonucleic acid from the adsorbent; and (d) a concentrator connected by conduit to said adsorber for concentrating DNA eluates received from the adsorber, said concentrator further comprising cleavage reagent supplying means for adding cleavage reagent to the concentrator, said concentrator further comprising heating means for heating the cleavage reagent and DNA eluates, whereby the deoxyribonucleic acid is cleaved at the position of the modified base. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for determining the base sequence of deoxyribonucleic acid comprising:
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(a) a reaction vessel containing a reaction mixture comprising radioactive phosphorous-labeled DNA; (b) a DNA adsorber attached to said vessel, said DNA adsorber further comprising an adsorbent for adsorbing DNA; (c) means for washing adsorbed DNA to remove any reagents used for chemical modification; (d) means for eluting the adsorbed DNA from the adsorbent, whereby an eluate is obtained; (e) a concentrator attached to said adsorber for collecting and concentrating the eluate; (f) means for introducing a cleavage reagent attached to said concentrator whereby modified DNA strands located in said concentrator can be cleaved where modified bases are positioned to provide DNA fragments. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification