High performance fluorescence imaging module for genomic testing assay
Fluorescence imaging system designs are described that provide larger fields-of-view, increased spatial resolution, improved modulation transfer and image quality, higher spatial sampling frequency, faster transitions between image capture when repositioning the sample plane to capture a series of images (e.g., of different fields-of-view), and improved imaging system duty cycle, and thus enable higher throughput image acquisition and analysis for genomics and other imaging applications.
1. A method for nucleic acid analysis, comprising:
(a) providing a flow cell comprising a first interior surface and a second interior surface that is axially-displaced from said first interior surface, wherein said first interior surface comprises a first plurality of nucleic acid molecules coupled thereto and said second interior surface comprises a second plurality of nucleic acid molecules coupled thereto, wherein a nucleic acid molecule of said first plurality of nucleic acid molecules or said second plurality of nucleic acid molecules comprises an optically detectable nucleotide, wherein said first interior surface or said second interior surface is in optical communication with an optical sensor as part of an optical system having a numerical aperture (NA) of less than 0.6 and a field-of-view (FOV) of greater than 2.5 mm 2 ; and
(b) detecting an optical signal from said optically detectable nucleotide of said nucleic acid molecule with said optical sensor.
2. The method of claim 1 , wherein said flow cell has a wall thickness of at least 700 μm and a fluid-filled gap between said first interior surface and said second interior surface of at least 50 μm.
3. The method of claim 1 , wherein said optical system comprises an objective lens in optical communication with said optical sensor and at least one optical element disposed between said objective lens and said optical sensor.
4. The method of claim 3 , wherein said detecting further comprises moving said at least one optical element into an optical path between said objective lens and said optical sensor.
5. The method of claim 4 , wherein said at least one optical element comprises a motion-actuated compensator.
6. The method of claim 3 , wherein said at least one optical element is in a permanent position between said objective lens and said optical sensor.
7. The method of claim 3 , wherein said first interior surface of said flow cell is disposed in an optical path between said objective lens and said second interior surface of said flow cell.
8. The method of claim 1 , further comprising analyzing sequence information obtained from the optical signal detected in (b) with a field-programmable gate array (FPGA).
9. The method of claim 1 , further comprising determining an identity of said optically detectable nucleotide of said nucleic acid molecule.
10. The method of claim 9 , wherein said determining said identity of said optically detectable nucleotide of said nucleic acid molecule comprises performing a sequencing-by-nucleotide incorporation reaction.
11. The method of claim 9 , wherein said determining said identity of said optically detectable nucleotide of said nucleic acid molecule comprises performing a sequencing-by-nucleotide base-pairing reaction.
12. The method of claim 9 , wherein said determining said identity of said optically detectable nucleotide of said nucleic acid molecule comprises performing a sequencing-by-nucleotide binding reaction.
13. The method of claim 1 , wherein said optical system further comprises a focusing mechanism for refocusing said optical system between detecting said optical signal from said optically detectable nucleotide of said nucleic acid molecule of said first plurality of nucleic acid molecules and said optical signal from said optically detectable nucleotide of said nucleic acid molecule of said second plurality of nucleic acid molecules.
14. The method of claim 1 , wherein said detecting further comprises acquiring said optical signal from two or more fields-of-view on at least one of said first interior surface of said flow cell and said second interior surface of said flow cell.
15. The method of claim 1 , wherein said detecting further comprises detecting, using at least 2 optical channels, said optical signal comprising at least 2 distinct detectable labels.
16. The method of claim 1 , wherein said optical sensor comprises pixels having a pixel dimension such that a spatial sampling frequency for said optical system is at least twice an optical resolution of said optical system.
17. The method of claim 1 , wherein said optically detectable nucleotide of said nucleic acid molecule comprises a conjugated nucleotide composition comprising a common core and a plurality of nucleotide moieties coupled thereto, wherein a nucleotide of said plurality of nucleotide moieties is complementary to said optically detectable nucleotide of said nucleic acid molecule.
18. The method of claim 17 , wherein said conjugated nucleotide composition comprises a plurality of fluorescent labels.
19. The method of claim 18 , wherein said plurality of fluorescent labels is coupled to said common core.