Method of nucleic acid amplification
A nucleic acid molecule can be annealed to an appropriate immobilized primer. The primer can then be extended and the molecule and the primer can be separated from one another. The extended primer can then be annealed to another immobilized primer and the other primer can be extended. Both extended primers can then be separated from one another and can be used to provided further extended primers. The process can be repeated to provide amplified, immobilized nucleic acid molecules. These can be used for many different purposes, including sequencing, screening, diagnosis, in situ nucleic acid synthesis, monitoring gene expression, nucleic acid fingerprinting, etc.
1. A method for producing an array of single stranded nucleic acid templates comprising the steps of:
A) providing a population of different nucleic acid fragments comprising a target region of unknown sequence, attaching a nucleic acid sequence to each end of each of the different nucleic acid fragments, and producing a collection of different fragments wherein each of the collection of different fragments comprises an identical universal first end and an identical universal second end;
B) providing immobilized primers comprising at least two different sequences, each sequence of the at least two different sequences comprising a region complementary to the identical universal first end or the identical universal second end of the fragments;
C) adding the collection of different fragments to the immobilized primers to allow the different fragments to anneal to the immobilized primers;
D) amplifying the collection of different fragments and producing an array of amplified double stranded templates comprising the target region of unknown sequence; and
E) cleaving just one strand of each of the amplified double stranded templates on the array to remove the one strand of each of the amplified double stranded templates from the array and to retain other strand of each of the amplified double stranded templates on the array wherein the another strand of each of the amplified double stranded templates comprises the target region of unknown sequence, thereby producing an array of single stranded nucleic acid templates.
2. The method according to claim 1 , wherein the immobilized primers consist of 2 n different types of primers, wherein n is an integer equal to or more than 2.
3. The method according to claim 1 , wherein the immobilized primers are present in about the same concentration.
4. The method according to claim 1 , wherein the amplifying the collection of different fragments is carried out in the presence of a supply of nucleotides and a nucleic acid polymerase.
5. The method according to claim 1 , wherein the nucleotides contain one or more detectable labels and the one or more detectable labels is/are incorporated into the amplified double stranded templates.
6. The method according to claim 1 , wherein the amplifying the collection of different fragments is repeated cycles of nucleic acid amplification and is performed automatically.
7. The method of claim 5 in which the labels are fluorescent labels or radiolabels.
8. The method according to claim 1 , wherein said cleaving just one strand of each of the amplified double stranded templates on the array is carried out with a ribozyme, wherein the amplified double stranded templates comprise RNA sequences and step D) is performed in the presence of a RNA polymerase and ribonucleotides.