Nanonozzle device arrays: their preparation and use for macromolecular analysis
Constricted nanochannel devices suitable for use in analysis of macromolecular structure, including DNA sequencing, are disclosed. Also disclosed are methods for fabricating such devices and for analyzing macromolecules using such devices.
1. A device for analyzing a polynucleotide, the device comprising:
two or more fluid reservoirs joined by a fluid pathway;
a nanochannel having a first inner diameter between about 10 nm and about 500 nm, the first inner diameter of the nanochannel capable of maintaining a linearized polynucleotide in a linearized form,
the nanochannel comprising a constriction having a second inner diameter in the range of about 0.5 nm to about 100 nm, wherein the constriction is capable of permitting the passage of the linearized polynucleotide,
wherein the nanochannel and the constriction are located in the fluid pathway between the reservoirs; and
a sensor associated with the device located to detect a signal from at least a portion of the polynucleotide as it passes through the constriction,
the device configured to transport the polynucleotide through the nanochannel along a gradient, wherein the device is configured to vary the gradient to pass transport the polynucleotide in each of the forward and reverse directions.
2. The device of claim 1 , wherein the device is further configured to vary the gradient to pass a portion of the polynucleotide through the constriction multiple times.
3. The device of claim 1 , wherein the constriction resides at an end of the nanochannel.
4. The device of claim 1 , wherein the constriction resides within the nanochannel.
5. The device of claim 1 , wherein the first inner diameter is in the range of about 150 nm to about 250 nm.
6. The device of claim 1 , wherein the first inner diameter is in the range of about 10 nm to about 50 nm.
7. The device of claim 1 , wherein the nanochannel comprises a length of at least about 50 nm.
8. The device of claim 1 , wherein a ratio of the second inner diameter to the first inner diameter is at most 40%.
9. A method for characterizing one or more features of a polynucleotide, comprising:
linearizing the polynucleotide residing at least in part within a nanochannel having a first inner diameter between about 10 nm and about 500 nm,
the nanochannel comprising a constriction that is configured to locally reduce the first inner diameter to a second inner diameter of about 0.5 nm to about 100 nm, the constriction capable of physically constraining at least a portion of the polynucleotide so as to maintain in linear form that portion polynucleotide of the linearized polynucleotide,
transporting the linearized polynucleotide within the nanochannel such that the portion of the linearized polynucleotide passes through the constriction and remains in linear form, and
monitoring a signal arising in connection with the label of the polynucleotide passing through the constriction, wherein the signal characterizes one or more features of the polynucleotide.
10. The method of claim 9 , further comprising transporting the linearized polynucleotide in both forward and reverse directions through the constriction.
11. The method of claim 9 wherein the portion of the linearized polynucleotide passes through the constriction more than once.
12. The method of claim 9 wherein transporting the linearized polynucleotide macromolecule comprises exposing the linearized polynucleotide to a gradient.
13. The method of claim 12 , wherein the gradient is selected from the group consisting of: an electroosmotic field, an electrophoretic field, capillary flow, a magnetic field, an electric field, a mechanical force, an electroosmotic force, an electrophoretic force, an electrokinetic force, a temperature gradient, a pressure gradient, a surface property gradient, a capillary flow.
14. The method of claim 9 , wherein the signal is selected from the group consisting of: wherein the signal comprises a visual signal, an infrared signal, an ultraviolet signal, a magnetic signal, an electrical signal, an electromagnetic signal.
15. The method of claim 9 , wherein the linearized polynucleotide comprises a label.
16. The method of claim 9 , wherein a feature of the linearized polynucleotide comprises the location of one or more labels of the linearized polynucleotide.
17. The method of claim 9 , wherein a feature of the linearized polynucleotide comprises the position of one or more molecules of the linearized polynucleotide, DNA polymorphisms, DNA copy number polymorphisms, amplifications within DNA, deletions within DNA, translocations within DNA, inversions of particular loci within DNA, the location of a methyl group within the linearized polynucleotide.
18. The method of claim 9 , wherein a ratio of the diameter of the constriction to the inner diameter is at most 40%.