Integrated nucleic acid analysis
The present disclosure provides fully integrated microfluidic systems to perform nucleic acid analysis. These processes include sample collection, nucleic acid extraction and purification, amplification, sequencing, and separation and detection. The present disclosure also provides optical detection systems and methods for separation and detection of biological molecules. In particular, the various aspects of the invention enable the simultaneous separation and detection of a plurality of biological molecules, typically fluorescent dye-labeled nucleic acids, within one or a plurality of microfluidic chambers or channels. The nucleic acids can be labeled with at least 6 dyes, each having a unique peak emission wavelength. The present systems and methods are particularly useful for DNA fragment sizing applications such as human identification by genetic fingerprinting and DNA sequencing applications such as clinical diagnostics.
1. An integrated biochip system comprising:
(a) a biochip comprising a plurality microfluidic systems, wherein each microfluidic system comprises a first reaction chamber in microfluidic communication with a separation chamber, wherein
the first reaction chamber is adapted for;
(i) nucleic acid extraction;
(ii) nucleic acid purification;
(iii) pre-nucleic acid amplification cleanup;
(iv) nucleic acid amplification;
(v) post-nucleic acid amplification cleanup;
(vi) pre-nucleic acid sequencing cleanup;
(vii) nucleic acid sequencing;
(viii) post-nucleic acid sequencing cleanup;
(ix) reverse transcription;
(x) pre-reverse transcription cleanup;
(xi) post-reverse transcription cleanup;
(xii) nucleic acid ligation;
(xiii) nucleic acid hybridization; or
(xiv) quantification; and
the separation chamber comprises a detection position; and
(b) a separation and detection system comprising,
(i) a separation element for simultaneously separating a plurality of target analytes in the separation chamber;
(ii) one or more light sources positioned to illuminate the detection positions on the biochip;
(iii) a mirror to scan said one or more light sources sequentially between said detection positions;
(iv) one or a plurality of first optical elements positioned for collecting and directing light emanating from the detection positions; and
(v) a light detector positioned to accept light directed from the one or plurality of first optical elements, wherein the light detector comprises a wavelength dispersive element to disperse the light from the one or plurality of first optical elements according to light wavelength into at least 6 wavelength components and, the wavelength dispersive element is positioned to provide at least a portion of the dispersed at least 6 wavelength components to at least 6 detection elements, wherein
each of the detection elements is in communication with a first control element for simultaneously collecting detection information from each of the detection elements; and wherein said light detector detects fluorescence from at least 6 dyes labeled to one or more biological molecules, each dye having a unique peak wavelength.
2. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for nucleic acid extraction.
3. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for nucleic acid purification.
4. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for nucleic acid amplification.
5. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for cleanup.
6. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for nucleic acid sequencing.
7. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for reverse transcription.
8. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for nucleic acid ligation.
9. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for nucleic acid hybridization.
10. The integrated biochip system of claim 1 , wherein the first reaction chamber is adapted for quantification.
11. An integrated biochip system comprising:
(a) a biochip comprising a plurality microfluidic systems, wherein each microfluidic system comprises a first reaction chamber in microfluidic communication with a separation chamber, wherein
the first reaction chamber is adapted for
(i) nucleic acid extraction;
(ii) nucleic acid purification;
(iii) pre-nucleic acid amplification cleanup;
(iv) nucleic acid amplification;
(v) post-nucleic acid amplification cleanup;
(vi) pre-nucleic acid sequencing cleanup;
(vii) nucleic acid sequencing;
(viii) post-nucleic acid sequencing cleanup;
(ix) reverse transcription;
(x) pre-reverse transcription cleanup;
(xi) post-reverse transcription cleanup;
(xii) nucleic acid ligation;
(xiii) nucleic acid hybridization; or
(xiv) quantification; and
the separation chamber comprises a detection position; and
(b) a separation and detection system comprising,
(i) a separation element for simultaneously separating a plurality of biological molecules comprising DNA sequences, in the separation chamber;
(ii) one or more light sources positioned to illuminate the detection positions on the biochip;
(iii) a mirror to scan said one or more light sources sequentially between said detection positions;
(iv) one or a plurality of first optical elements positioned for collecting and directing light emanating from the detection positions; and
(v) a light detector positioned to accept light directed from the one or plurality of first optical elements, wherein the light detector comprises a wavelength dispersive element to disperse the light from the one or plurality of first optical elements according to light wavelength into at least 6 wavelength components, and the wavelength dispersive element positioned to provide at least a portion of the dispersed at least 6 wavelength components to at least 6 detection elements, wherein each of the detection elements is in communication with a first control element for simultaneously collecting detection information from each of the detection elements; and
wherein said light detector detects fluorescence from at least 8 dyes labeled to one or more DNA sequences, each dye having a unique peak wavelength, said dyes being members of at least two 4-dye containing subsets, such that said dye sets are capable of detecting at least two DNA sequences in a single channel, wherein the number of dyes is a multiple of four, and the number of DNA sequences to be detected is equal to one quarter of the multiple, such that each of the different dyes is present in only one subset.