Abstract:
A method for estimating error in expression data. In one embodiment, the method includes single molecule sequencing a plurality of expression tags from an organism; removing expression tags that ambiguously relate to multiple genes; assigning each remaining expression tag to a respective gene; selecting a random subset of the expression tags; and counting the number of expression tags associated with each gene. The process of selecting a random subset of the expression tags; and counting the number of expression tags associated with each gene is repeated a predetermined number of times, both for expression tags sequenced before and after exposure of the organism to a perturbation. The method also includes the step of calculating a measure of error in response to the counts of the number of expression tags before and after the perturbation.
Abstract:
Described herein is a mutant polymerase, specifically the Klenow exo- polymerase in which the proline at amino acid position 680 is replaced by a glycine (P680G), and its use in sequencing a single polynucleotide template using single molecule sequencing.
Abstract:
The invention provides compositions for improving the accuracy of a sequencing-by-synthesis reaction by minimizing the incorporation of unlabeled dNTPs.
Abstract:
The invention provides nucleotides of Formula (I) for use in sequencing nucleic acid molecules. Formula (I) wherein, B is selected from the group consisting of a purine, a pyrimidine, and analogs thereof, R 1 is selected from the group consisting of OH and -O-blocking agent, R 2 is selected from the group consisting of H and OH, R 3 is selected from the group consisting of Formula (A) and Formula (B), R 4 is selected from the group consisting of alkyl, O, S, and NR 5 , R 5 is selected from the group consisting of H and alkyl, R 6 is N 3 , R 7 is an alkyl linker, L is a label, m, at each occurrence, independently is an integer from 1 to 3, n, at each occurrence, independently is an integer from 1 to 18, and p, at each occurrence, independently is an integer from 0 to 11.
Abstract:
The invention provides a family of nucleotide analogs useful in sequencing nucleic acids containing a homopolymer region comprising, for example, two or more base repeats, and to sequencing methods using such nucleotide analogs.
Abstract:
Methods of the invention comprise methods and devices for nucleic acid sequence determination. Generally, the invention relates to preparing a substrate for sequencing a target nucleic acid.
Abstract:
An apparatus for analyzing the presence of a single molecule comprises a sample plate (30') having a sample located thereon. In one embodiment the apparatus comprises two lasers (46', 46'') for providing illumination light at two different wavelengths suitable for exciting fluorescence in the sample, a collimator comprising a band-pass filter (50', 55''), a diverging lens (54', 54''), a field stop (62'), and a converging lens (66') for directing the illunination light through a total internal reflection objective (74') onto the sample, and means (34', 34'') for detecting a fluorescent image produced by said sample in response to the illunination light. In one embodiment the apparatus further comprises an auto-focus module comprising a laser (38'), a beam splitter cube (86'), a converging lens (90'), and an auto-focus dichroec (94') for maintaining focus of the objective on the sample.
Abstract:
A multi-channel flow cell can allow for reduced cross-contamination in sample loading and the ability to observe activity within the flow cell once the channels are loaded. A multi-channel flow cell includes a plurality of independently-addressable channels sandwiched between a two substrates. Each of the channels can be coated with a layer that facilitates support-binding of an analyte. Each of the channels terminates on one end in an inlet and on the other end in an outlet. A loading block having inlet ports that match the inlets of the channels can be mated to the inlets of the channels, and an outlet block can be mated to the outlets of the channels. Analytes can be introduced into the channels via the inlet ports of the loading block and are pulled through the channels by capillary action or by vacuum. Once analyte has been introduced into each of the channels, the loading and outlet blocks can be removed and the device turned over. Such a flow cell can be used for streamlining the process of reaction and interrogation of biochemical assays at the microfluidic level. Reagents can be introduced into each of the channels of the flow cell for chemical reactions therein, excess reagent being washed out through the channel outlets. Observation of optically-detectable moieties is then conducted. With such a flow cell optical labels associated with incorporation in a sequencing-by-synthesis reaction can be observed.
Abstract:
A method of increasing the spatial uniformity of the detected intensity of a beam of light from a laser in a system including the laser and a light detector. In one embodiment the method includes the steps of generating a beam of light with the laser; and moving the beam of light and the light detector relative to each other, such that the detector averages the spatial intensity of the beam of light over time. In another embodiment the invention relates to a system for increasing the detected spatial uniformity of the intensity of a beam of light. In one embodiment the system comprises a light detector; a laser source for generating the beam of light; and a means for moving the beam of light and the detector relative to one another such that the detector averages the intensity of the light beam over time