Molecular diagnostics system and methods
The present invention relates to automated devices and methods for the extraction of nucleic acids from cells, the amplification of segments of nucleic acid and the detection of nucleic acids, all in a convenient and portable manner. The invention is particularly suited for use in point-of-care medical diagnostic testing.
1. An integrated single-use device for performing a nucleic acid analysis, comprising:
a housing,
an entry port for accepting a sample suspected of containing a target nucleic acid,
a first chamber operably connected to the entry port and comprising:
a reagent for extracting the target nucleic acid,
magnet beads comprising a coating configured to bind the target nucleic acid, and
a wax configured to melt and form a contiguous wax layer in a region of egress of the first chamber;
a means for generating a magnetic field configured to draw the magnet beads through the contiguous wax layer;
a first conduit permitting passage of extracted nucleic acid from the region of egress of the first chamber into an amplification chamber, said housing containing an amplification reagent that is capable of incorporating a detectable label into an amplified nucleic acid target,
the amplification chamber having a heating means and a temperature sensing means for controlling amplification conditions,
the amplification chamber being operably linked to a second conduit containing a sensing region with an immobilized capture oligonucleotide,
a means for moving the amplified target to the sensing region to permit binding of said amplified target to said capture oligonucleotide, and
a holding chamber operably attached to said second conduit and containing a fluid configured to substantially displace uncaptured amplified target from the sensing region and permit sensing of said detectable label retained in said sensing region.
2. The device of claim 1 , wherein the label moiety is selected from the group consisting of fluorocein, dinitrophenol, biotin, cholesterol, digoxigenin and estrialdiol.
3. The device of claim 1 , wherein the sensing region is interrogated by an optical detector.
4. The device of claim 1 , wherein the sensing region is interrogated by an integrated optical detector.
5. The device of claim 1 , wherein the sensing region is interrogated by an integrated electrochemical detector.
6. The device of claim 1 , wherein amplification reagent is located in said first conduit.
7. The device of claim 1 , wherein amplification reagent is located in said amplification chamber.
8. The device of claim 1 , wherein amplification reagent is located in a holding chamber operably connected to said amplification chamber.
9. The device of claim 1 , wherein amplification reagent is located in a holding chamber operably connected to said first conduit.
10. The device of claim 1 , wherein said fluid is a wash fluid and contained in a sealed pouch within the holding chamber.
11. The device of claim 1 , wherein said means for moving the amplification target is pneumatic.
12. An integrated single-use device for performing a nucleic acid analysis, comprising:
a housing,
an entry port for accepting a sample suspected of containing a target nucleic acid,
a first chamber operably connected to the entry port and comprising:
a reagent for extracting the target nucleic acid onto magnetic beads that are located in the first chamber, and
a wax configured to melt and form a substantially contiguous wax layer that covers an egress region of the first chamber into a first conduit,
wherein the magnetic beads that are associated with the extracted target nucleic acid are configured to pass through the wax layer into the first conduit by means of an applied magnetic field,
the first conduit permitting passage of the extracted target nucleic acid and the magnetic beads into an amplification chamber, said housing containing an amplification reagent that is capable of incorporating a detectable label into an amplified nucleic acid target,
the amplification chamber having a heating means and a temperature sensing means for controlling amplification conditions,
the amplification chamber being operably linked to a second conduit containing a sensing region with an immobilized capture oligonucleotide,
said housing containing a means for moving the amplified target to the sensing region to permit binding of said amplified target to said capture oligonucleotide, and
a holding chamber operably attached to said second conduit and containing a fluid configured to substantially displace uncaptured amplified target from the sensing region and permit optical sensing of the detectable label retained in the sensing region.
13. The device of claim 12 , wherein the detectable label is selected from the group consisting of fluorocein, dinitrophenol, biotin, cholesterol, digoxigenin and estrialdiol.
14. The device of claim 12 , wherein the sensing region is interrogated by an optical detector.
15. The device of claim 12 ; wherein the sensing region is interrogated by an integrated optical detector.
16. The device of claim 12 , wherein amplification reagent is located in said first conduit.
17. The device of claim 12 , wherein amplification reagent is located in said amplification chamber.
18. The device of claim 12 , wherein amplification reagent is located in a holding chamber operably connected to said amplification chamber.
19. The device of claim 12 , wherein amplification reagent is located in a holding chamber operably connected to said first conduit.
20. The device of claim 12 , wherein said fluid is a wash fluid and contained in a sealed pouch within the holding chamber.
21. The device of claim 12 , wherein said means for moving the amplification target is pneumatic.