IP Library › Granted Patent US 12,351,863
Granted Patent B2
US 12,351,863 · App. 17/695,600 · Granted Jul 8, 2025

Isothermal amplification components and processes

Inventors: Andrew P. Miller (San Diego, CA); Honghua Zhang (San Diego, CA)
Assignee: Nat Diagnostics, Inc.
C12Q1/6844C12Q1/6816C12Q1/6818C12Q1/686C12Q1/689G01N21/6428C12Q2521/101C12Q2521/107C12Q2527/101C12Q2527/113C12Q2531/113C12Q2561/113C12Q2600/16G01N2021/6432
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Quick Facts
Patent No.
US 12,351,863
App. No.
17/695,600
Granted
Jul 8, 2025
Kind
B2
Abstract

The technology relates in part to methods and compositions for isothermal amplification of nucleic acids.

Claims (34)

1. A method for detecting a target nucleic acid sequence in a sample, the method comprising:

(a) amplifying a target nucleic acid sequence comprising a first strand and a second strand complementary to each other under an isothermal amplification condition, wherein the amplifying comprises contacting a nucleic acid comprising the target nucleic acid sequence with:

i) a first primer and a second primer, wherein the first primer is capable of hybridizing to a sequence of the first strand of the target nucleic acid sequence, and the second primer is capable to hybridizing to a sequence of the second strand of the target nucleic acid sequence; and

ii) an enzyme having a hyperthermophile polymerase activity, thereby generating a nucleic acid amplification product at detectable levels within 15 minutes, wherein the nucleic acid amplification product comprises:

(1) the sequence of the first primer, and the reverse complement thereof,

(2) the sequence of the second primer, and the reverse complement thereof, and

(3) a spacer sequence flanked by (1) the sequence of the first primer and the reverse complement thereof and (2) the sequence of the second primer and the reverse complement thereof, wherein the spacer sequence is 1 to 10 bases long,

wherein the amplifying does not comprise using any enzyme other than the enzyme having a hyperthermophile polymerase activity; and

(b) detecting the nucleic acid amplification product.

2. The method of claim 1 , wherein step (b) further comprises determining the amount of the nucleic acid that comprises the target nucleic acid sequence in the sample.

3. The method of claim 1 , wherein the nucleic acid is a genomic nucleic acid, a plasmid nucleic acid, a mitochondrial nucleic acid, a cellular nucleic acid, or an extracellular nucleic acid.

4. The method of claim 1 , wherein the nucleic acid is a bacterial nucleic acid, a viral nucleic acid, a fungal nucleic acid, a protist nucleic acid, a plant nucleic acid, a non-human animal nucleic acid, or a human nucleic acid.

5. The method of claim 1 , wherein the target nucleic acid sequence is a bacterial nucleic acid sequence or a viral nucleic acid sequence.

6. The method of claim 1 , wherein the nucleic acid is a double-stranded DNA.

7. The method of claim 1 , wherein the nucleic acid is a product of reverse transcription reaction.

8. The method of claim 7 , wherein the nucleic acid is a product of reverse transcription reaction generated from a cellular RNA, a mRNA, a microRNA, a bacterial RNA, or a viral RNA.

9. The method of claim 1 , further comprising generating the nucleic acid by a reverse transcription reaction before step (a).

10. The method of claim 9 , wherein the method is performed in a single reaction vessel.

11. The method of claim 1 , wherein the enzyme having a hyperthermophile polymerase activity has a reverse transcriptase activity.

12. The method of claim 1 , wherein the enzyme having a hyperthermophile polymerase activity has an amino acid sequence that is at least 90% identical to the amino acid sequence of SEQ ID NO:8 or a functional fragment thereof.

13. The method of claim 1 , wherein the enzyme having a hyperthermophile polymerase activity is a polymerase comprising the amino acid sequence of SEQ ID NO: 8.

14. The method of claim 1 , wherein the enzyme having a hyperthermophile polymerase activity is a modified hyperthermophile polymerase enzyme having 10% or less exonuclease activity compared to an unmodified hyperthermophile polymerase.

15. The method of claim 1 , wherein the method does not comprise contacting the nucleic acid with a single-stranded DNA binding protein prior to or during step (a).

16. The method of claim 1 , wherein the amplifying the target nucleic acid sequence is performed at a constant temperature between 55 degrees Celsius and 75 degrees Celsius.

17. The method of claim 16 , wherein the amplifying the target nucleic acid sequence is performed at a constant temperature of 65 degrees Celsius.

18. The method of claim 1 , wherein the first primer, the second primer, or both is 8 to 16 bases long.

19. The method of claim 1 , wherein the nucleic acid amplification product is 20 to 40 bases long.

20. The method of claim 1 , wherein the spacer sequence comprises a portion of the target nucleic acid sequence.

21. The method of claim 20 , wherein the spacer sequence is 1 to 5 bases long.

22. The method of claim 1 , further comprising contacting the nucleic acid amplification product with a signal-generating oligonucleotide capable of hybridizing to the amplification product, wherein the signal-generating oligonucleotide comprises a fluorophore, a quencher, or both.

23. The method of claim 1 , wherein the detecting the nucleic acid amplification product comprises detecting a fluorescent signal.

24. The method of claim 23 , wherein the fluorescent signal is from a molecular beacon.

25. The method of claim 1 , wherein the first primer, the second primer, or both comprise one or more of DNA bases, modified DNA bases, or a combination thereof.

26. The method of claim 1 , wherein the nucleic acid is obtained from a biological sample.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 15, 2022
From: MILLER, ANDREW P.; ZHANG, HONGHUA
To: NAT DIAGNOSTICS, INC.
Reel/Frame 059273/0576 →
Continuity (3)
Continuation 16089063
Continuation In Part 15090405 · Apr 4, 2016
Related Publication 20220251629A1 · Aug 11, 2022
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