Methods, systems and devices for selection and generation of genome edited clones
Methods are described herein for isolating clonal populations of cells having a defined genetic modification. The methods are performed, at least in part, in a microfluidic device comprising one or more sequestration pens. The methods include the steps of: maintaining individual cells (or precursors thereof) that have undergone a genomic editing process in corresponding sequestration pens of a microfluidic device; expanding the individual cells into respective clonal populations of cells; and detecting, in one or more cells of each clonal population, the presence of a first nucleic acid sequence that is indicative of the presence of an on-target genome edit in the clonal population of cells. Also described are methods of performing genome editing within a microfluidic device, and compositions comprising one or more clonal populations of cells generated according to the methods disclosed herein.
1. A method of generating a clonal population of genetically modified cells in a microfluidic device comprising a sequestration pen, the method comprising:
maintaining a first cell in the sequestration pen of the microfluidic device, wherein the first cell has undergone a genome editing process;
expanding the first cell into a clonal population of cells in the sequestration pen;
detecting, in one or more cells of a first subset of the clonal population, the presence of a first nucleic acid sequence, wherein the first nucleic acid sequence indicates the presence of an on-target genome edit in the clonal population of cells; and
preserving a second subset of the clonal population of cells.
2. The method of claim 1 , wherein the first cell is a mammalian cell or an immunological cell.
3. The method of claim 1 , wherein the first cell is a stem or progenitor cell.
4. The method of claim 1 , wherein detecting the first nucleic acid sequence comprises:
selecting one or more cells from the clonal population of cells; and
extracting nucleic acid from the one or more selected cells.
5. The method of claim 4 , further comprising:
moving the one or more selected cells out of the sequestration pen; and
exporting the one or more selected cells from the microfluidic device, wherein the nucleic acid is extracted outside of the microfluidic device.
6. The method of claim 4 , further comprising:
moving the one or more selected cells out of the sequestration pen to a separate region within the microfluidic device, wherein the nucleic acid is extracted in the separate region.
7. The method of claim 1 , further comprising:
detecting, in one of more cells of the clonal population, the presence of a second nucleic acid sequence, wherein the combination of the first nucleic acid sequence and the second nucleic acid sequence indicates the presence of the on-target genome edit in the clonal population of cells.
8. The method of claim 1 , wherein the microfluidic device comprises a substrate that has a dielectrophoresis (DEP) configuration.
9. The method of claim 1 , wherein expanding the first cell into a clonal population of cells further comprises monitoring one or more characteristics of the cells of the clonal population for a period of time.
10. The method of claim 9 , wherein the monitoring comprises assessing the production of a protein of interest, the presence of one or more cell surface markers, and/or reaction with a specific antibody.
11. A method of performing targeted genome editing within a microfluidic device, the method comprising:
selecting a first cell for genome editing;
positioning the first cell within an editing region of the microfluidic device; and
while the first cell is located within the editing region:
contacting the first cell with a genome editing biomolecule, the genome editing biomolecule configured to edit a genome of the first cell at a target site in the genome; and
allowing the genome editing biomolecule to edit the genome of the first cell at the target site.
12. The method of claim 11 , wherein the genome editing biomolecule comprises an endonuclease.
13. The method of claim 11 , wherein the genome editing biomolecule comprises a nucleic acid that encodes an endonuclease.
14. The method of claim 11 , wherein the step of contacting the first cell comprises permeabilizing the first cell.
15. The method of claim 11 , wherein the genome editing biomolecule is associated with a nanoparticle delivery vehicle or microstructure, and wherein contacting the first cell with a genome editing biomolecule comprises contacting the first cell with the nanoparticle delivery vehicle or microstructure.
16. The method of claim 11 , wherein the first cell is a mammalian cell, an immunological cell, a stem cell, or a progenitor cell.
17. The method of claim 11 , wherein the edit to the target site of the genome of the first cell comprises a deletion.
18. The method of claim 11 , wherein the edit to the target site of the genome of the first cell comprises an insertion of an exogenous nucleic acid sequence.
19. The method of claim 1 , further comprising:
exporting one or more cells of a clonal population of genetically modified cells from the microfluidic device into a well plate, and
culturing the one or more exported cells in the well plate.
20. A composition comprising a clonal population of genetically modified cells, wherein the clonal population was generated by the methods of claim 1 .