Parallel patch clamp system
View Patent ↗A system for high-throughput analysis of membranous samples having ion channels including at least one membranous sample, a multi-compartment structure including an extracellular chamber, an opposing intracellular chamber and a partition separating the extracellular and intracellular chambers, the partition having a plurality of apertures fluidly and electrically coupling the extracellular and intracellular chambers, wherein at least one of the apertures is sealed by the at least one membranous sample, and another of the apertures is unsealed, a electric source configured to apply a current between the extracellular and intracellular chambers, wherein a portion of the current travels through the unsealed aperture, and a current sensor configured to measure the current between the extracellular and intracellular chambers. A method of using the system is also disclosed.
1. A system for high-throughput analysis of membranous samples having ion channels, the system comprising:
at least one membranous sample;
a multi-compartment structure including an extracellular chamber, an opposing intracellular chamber and a partition separating the extracellular and intracellular chambers, the partition having a plurality of apertures fluidly and electrically coupling the extracellular and intracellular chambers, at least one of the apertures being sealed by the at least one membranous sample having a seal resistance in a range between about 100 to about 1000 Mohms, another of the apertures being unsealed, the unsealed aperture having an aperture resistance less then the seal resistance by about two orders of magnitude;
an electric source configured to apply a voltage and/or a current between the extracellular and intracellular chambers, wherein a portion of current travels through the unsealed aperture creating an electrical leak; and
an electronic detector with a leak subtraction data acquisition protocol for making a measurement while the portion of current travels through the at least one unsealed aperture, whereby the electrical leak value is subtracted from a measured data.
2. The system of claim 1 , wherein the membranous sample is selected from the group consisting of cells, vesicles, organelles, cell membrane fragments or synthetic membranes, which include an ion channel; and wherein the electric source comprises an amplifier or a patch clamp, and the amplifier has a dynamic range sufficient to measure an electric leak without saturation.
3. The system of claim 2 , wherein a portion of the membranous sample is inside of the one aperture and a remainder of the membranous sample is outside of the one aperture of the partition and is substantially intact.
4. The system of claim 1 , wherein the multi-compartment structure includes a plurality of extracellular chambers with a predetermined number of apertures and at least one opposing intracellular chamber, wherein the partition separates the extracellular chambers from the at least one intracellular chambers.
5. The system of claim 1 , wherein the another of the apertures is open.
6. The system of claim 1 , wherein the apertures have a diameter in the range of approximately 0.5 μm to 5 μm.
7. The system of claim 1 , further comprising a current sensor configured to measure the current between the extracellular and intracellular chambers, wherein the current sensor and the electric source are respectively configured to apply and/or measure the current across the extracellular and intracellular chambers before the apertures are sealed by respective membranous samples.
8. The system of claim 1 , further comprising a fluidics system for adding fluids to the extracellular chamber, wherein the fluidics system is configured to provide add, read and wash fluidics.
9. The system of claim 8 , wherein the fluidics system is configured to disperse a solution of membranous samples in suspension into the extracellular chamber, wherein the at least one membranous samples is sealed to the at least one aperture within a requested time period of dispersion by the fluidics system.
10. The system of claim 1 , further comprising:
a first electrode in electrical contact with the extracellular chamber; and
a second electrode in electrical contact with the intracellular chamber; wherein the first and second electrodes are electrically coupled with the electric source for applying the electrical voltage across the extracellular and intracellular chambers.
11. A method of high-throughput analysis of membranous samples having ion channels comprising:
providing a system including a multi-compartment structure having an extracellular chamber, an opposing intracellular chamber and a partition separating the extracellular and intracellular chambers, the partition having a plurality of apertures fluidly and electrically coupling the extracellular and intracellular chambers, wherein the apertures for electrically sealing a membranous sample are selected from the group consisting of cells, vesicles, organelles, cell membrane fragments and synthetic membranes, which samples include an ion channel;
dispersing a plurality of membranous samples into the extracellular chamber such that the membranous samples seal at least one of the apertures, at least one membranous sample having a seal resistance at one of the apertures in a range between about 100 to about 1000 Mohms, and unsealed apertures, each unsealed aperture having an aperture resistance of about two orders of magnitude less then the seal resistance;
applying by an electric source electrical voltage and/or current between the extracellular and intracellular chambers while another of the apertures is unsealed; and
detecting by an electronic detector a resulting current and/or voltage across the extracellular and intracellular chambers, wherein a portion of the current being a current leak travels though the unsealed aperture and its current leak value is subtracted according to a data acquisition protocol of the electronic detector.
12. The method of claim 11 , wherein the dispersing step is accomplished by dispersing a solution of membranous samples in suspension into the extracellular chamber.
13. The method of claim 11 , wherein the dispersing step is accomplished by at least two membranous samples sealing at least two respective apertures, the method further comprising the step of summing the resulting current and/or voltage based on the two sealed membranous samples.
14. The method of claim 11 , wherein the dispersing step is accomplished by at least two membranous samples sealing at least two respective apertures, the method further comprising the step of averaging the resulting current and/or voltage based on the two sealed membranous samples.
15. The method of claim 11 , wherein the dispersing step is accomplished by at least n membranous samples sealing n respective apertures, the method further comprising the step of summing the resulting current and/or voltage based on the n sealed membranous samples.
16. The method of claim 11 , wherein the dispersing step is accomplished by at least n membranous samples sealing n respective apertures, the method further comprising the step of averaging the resulting current and/or voltage based on the n sealed membranous samples.
17. The method of claim 11 , wherein the applying step further includes voltage clamping the one membranous sample.
18. The method of claim 11 , wherein the applying and detecting steps are initiated before the membranous sample seals to the at least one aperture.
19. The method of claim 11 , the method further comprising the step of recording the current.
20. The method of claim 19 , wherein the recording step is begun within approximately 60 seconds from the dispensing step.
21. The method of claim 19 , wherein the recording step is begun within approximately five minutes from the dispensing step.
22. The method of claim 11 , the method further comprising the step of measuring the current and applying a leak subtraction data acquisition protocol.