Abstract:
A valve structure comprises an elastomeric block formed with first and second microfabricated recesses separated by a membrane portion of the elastomeric block. The valve is actuated by positioning a compliant electrode on a first side of the first recess proximate to and in physical communication with the membrane. Where the valve is to be electrostatically actuated, a second electrode is positioned on a second side of the first recess opposite the first side. Application of a potential difference across the electrodes causes the compliant electrode and the membrane to be attracted into the flow channel. Where the valve is to be electrostrictively actuated, a second electrode is positioned on the same side of the recess as the compliant electrode. Application of a potential difference across the electrodes causes the electrodes to be attracted such that elastomer membrane portion material between them is compressed and bows into the flow channel. Either of the electrostrictively or the electrostatically-actuated valve structures may include an electrically-conducting fluid in the second recess to serve as the compliant electrode.
Abstract:
The invention provides systems, including apparatus, methods, and kits, for the microfluidic manipulation and/or detection of particles, such as cells and/or beads. The invention provides systems, including apparatus, methods, and kits, for the microfluidic manipulation and/or analysis of particles, such as cells, viruses, organelles, beads, and/or vesicles. The invention also provides microfluidic mechanisms for carrying out these manipulations and analyses. These mechanisms may enable controlled input, movement/positioning, retention/localization, treatment, measurement, release, and/or output of particles. Furthermore, these mechanisms may be combined in any suitable order and/or employed for any suitable number of times within a system. Accordingly, these combinations may allow particles to be sorted, cultured, mixed, treated, and/or assayed, among others, as single particles, mixed groups of particles, arrays of particles, heterogeneous particle sets, and/or homogeneous particle sets, among others, in series and/or in parallel. In addition, these combinations may enable microfluidic systems to be reused. Furthermore, these combinations may allow the response of particles to treatment to be measured on a shorter time scale than was previously possible. Therefore, systems of the invention may allow a broad range of cell and particle assays, such as drug screens, cell characterizations, research studies, and/or clinical analyses, among others, to be scaled down to microfluidic size. Such scaled-down assays may use less sample and reagent, may be less labor intensive, and/or may be more informative than comparable macrofluidic assays.
Abstract:
A variety of elastomeric-based microfluidic devices and methods for using and manufacturing such devices are provided. Certain of the devices have arrays of reaction sites to facilitate high throughput analyses. Some devices also include reaction sites located at the end of blind channels at which reagents have been previously deposited during manufacture. The reagents become suspended once sample is introduced into the reaction site. The devices can be utilized with a variety of heating devices and thus can be used in a variety of analyses requiring temperature control, including thermocycling applications such as nucleic acid amplification reactions, genotyping and gene expression analyses.
Abstract:
In certain embodiments, the invention provides methods and devices for assaying single particles in a population of particles, wherein at least two parameters are measured for each particle. One or more parameters can be measured while the particles are in the separate reaction volumes. Alternatively or in addition, one or more parameters can be measured in a later analytic step, e.g., where reactions are carried out in the separate reaction volumes and the reaction products are recovered and analyzed. In particular embodiments, one or more parameter measurements are carried out "in parallel," i.e., essentially simultaneously in the separate reaction volumes.
Abstract:
This invention provides a technology for isolating nucleic acids from wax-embedded samples that is superior to the current state of the art. Standard protocols with this objective typically comprise dissolving the wax-embedded sample in an organic solvent, extracting nucleic acids from the organic solvent into an aqueous buffer, and isolating the nucleic acids from the aqueous buffer. The technology described here includes using hexadecane as the solvent to dissolve the sample, precipitating and washing the extracted nucleic acids, and dissolving the nucleic acids in a lysis buffer that includes NP40 and SDS. By implementing the reagents and techniques described in this disclosure, the user can obtain a product that has better yield, less degradation, and contains more unique mRNA transcripts for subsequent sequencing and analysis.
Abstract:
PROXIMITY ASSAYS FOR DETECTING NUCLEIC ACIDS AND PROTEINS IN A SINGLE CELL Methods and reagents for detection and analysis of nucleic acids and proteins using proximity extension assays. [Figure 1]
Abstract:
Disclosed herein is a method and kit thereof for isolating nucleic acids from wax-embedded samples using hexadecane as the solvent to dissolve the sample, precipitating and washing the extracted nucleic acids using ethanol, and dissolving the nucleic acids in a lysis buffer that includes NP40 and SDS. By implementing the reagents and techniques described in this disclosure, the user can obtain a product that has better yield, less degradation, and contains more unique mRNA transcripts for subsequent sequencing and analysis.
Abstract:
In certain embodiments, the present invention provides amplification methods in which nucleotide tag(s) and, optionally, a barcode nucleotide sequence are added to target nucleotide sequences. In other embodiments, the present invention provides a microfluidic device that includes a plurality of first input lines and a plurality of second input lines. The microfluidic device also includes a plurality of sets of first chambers and a plurality of sets of second chambers. Each set of first chambers is in fluid communication with one of the plurality of first input lines. Each set of second chambers is in fluid communication with one of the plurality of second input lines. The microfluidic device further includes a plurality of first pump elements in fluid communication with a first portion of the plurality of second input lines and a plurality of second pump elements in fluid communication with a second portion of the plurality of second input lines.
Abstract:
Described herein are methods for preparing DNA templates for single-cell transcript sequencing of RNA from a population of cells. The methods entail distributing cells from the population into separate reaction volumes so that a plurality of separate reaction volumes each contain a single, isolated cell, wherein the cells have been treated with a fixative prior to distribution. The isolated cells are then permeabilized or disrupted, and cDNA is prepared by reverse transcript, followed by amplification. Also provided is a novel chemistry for efficient production of DNA templates from T-cell receptors or immunoglobulins in single cells.
Abstract:
Methods for cell analysis are provided, comprising cell capturing, characterization, transport, and culture. In an exemplary method individual cells (and/or cellular units) are flowed into a microfluidic channel, the channel is partitioned into a plurality of contiguous segments, capturing at least one cell in at least one segment. A characteristic of one or more captured cells is determined and the cell(s) and combinations of cells are transported to specified cell holding chamber(s) based on the determined characteristic(s). Also provided are devices and systems for cell analysis.