Process for producing cDNA
First Claim
1. A process for the production of cDNA, comprising the steps of:
- (a) contacting a liquid containing mRNA with an insoluble support having DNA probes attached thereto via their 5'"'"' termini whereby mRNA in said sample is hybridized to said probes and thereby bound to said support, wherein;
(A) said insoluble support comprises a plurality of particles that are comprised of;
(i) superparamagnetic iron oxide dispersed within a polymer particle, (ii) nucleic acid-binding functional groups at the surface of said particle for bonding said probes and (iii) a coating to reduce non-specific binding;
(B) said probes are bound to said particles via said functional group;
(C) the particles in said plurality are monodisperse and the standard deviation of the diameter is less than 5%;
(b) removing said liquid; and
(c) adding enzymes and nucleotides in solution whereby said probe functions as a primer to produce single stranded cDNA on the mRNA templates.
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Abstract
The process includes the steps of: a) contacting a liquid containing mRNA with an insoluble support having DNA probes attached thereto via the 5'"'"' -terminus thereof whereby the MRNA is hybridized to said probes and hence to said support; b) removing said liquid; and c) adding enzymes and nucleotides in solution whereby the probe functions as a primer to produce single stranded cDNA on the mRNA probe. The probe DNA may be oligo-dT or a specific DNA sequence, such as one that is complementary to a conserved region in a class of mRNA molecules. The insoluble support comprises magnetic particles which are monodisperse polymer particles comprising superparamagnetic iron oxide, a coating to reduce non-specific binding and a substituent for attaching an oligonucleotide.
46 Citations
12 Claims
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1. A process for the production of cDNA, comprising the steps of:
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(a) contacting a liquid containing mRNA with an insoluble support having DNA probes attached thereto via their 5'"'"' termini whereby mRNA in said sample is hybridized to said probes and thereby bound to said support, wherein; (A) said insoluble support comprises a plurality of particles that are comprised of;
(i) superparamagnetic iron oxide dispersed within a polymer particle, (ii) nucleic acid-binding functional groups at the surface of said particle for bonding said probes and (iii) a coating to reduce non-specific binding;(B) said probes are bound to said particles via said functional group; (C) the particles in said plurality are monodisperse and the standard deviation of the diameter is less than 5%; (b) removing said liquid; and (c) adding enzymes and nucleotides in solution whereby said probe functions as a primer to produce single stranded cDNA on the mRNA templates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A kit for cDNA synthesis comprising:
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(a) an insoluble support having DNA probes attached thereto, and one or more of the following; (b) a reverse transcriptase; (c) a polymerase and optionally a ligase and/or a nuclease; (d) deoxynucleotides, and (e) buffers suitable for reverse transcription and/or polymerization wherein said insoluble support comprises a plurality of particles that are comprised of;
(i) superparamagnetic iron oxide dispersed within a polymer particle, (ii) a nucleic acid-binding functional group at the surface of said particle for bonding said probes and (iii) a coating to reduce non-specific binding;
said probes are bound to said particles via said functional group, and the particles in said plurality are monodisperse and the standard deviation of their diameter is less than 5%.
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11. A process for the production of cDNA, comprising the steps of:
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(a) contacting a liquid containing mRNA with monodisperse, superparamagnetic particles carrying a single stranded 5'"'"'-attached DNA probe capable of binding to said mRNA; (b) removing said liquid; (c) contacting said particles with an aqueous solution of a reverse transcriptase or polymerase in the presence of labelled nucleotides using the probe as a primer whereby labelled complementary single stranded DNA is formed if said mRNA was present in said liquid, wherein a predetermined amount of dideoxyunucleotides are present to limit chain synthesis to a predetermined average length thereby enabling the total amount of label to be correlated with the number of target nucleic acid molecules; (d) magnetically aggregating said particles onto a surface and removing said solution; and (e) determining the amount of said label in said complementary single stranded DNA. - View Dependent Claims (12)
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Specification