Method and device for cultivation and analysis of novel microbial species with unknown growth requirements
The invention provides devices and methods for automatically preparing pure cultures of microbial cells under native environmental conditions. The devices and methods permit the discovery and investigation of novel microorganisms having unknown culture requirements from natural environments and microbiomes. Cultures obtained using the invention lead to the identification and isolation of novel biologically active compounds. The devices utilize a single entry pore in a thin membrane to select a single cell for clonal expansion.
1. A device for obtaining a monoculture of microbial cells from an environment, the device comprising:
a first membrane comprising only a single entry pore for microbial cells, the entry pore having a diameter in the range from about 200 nm to about 2000 nm and a pore length from about 1 μm to about 10 μm, wherein the entry pore is produced using an ion gun, an electron beam, or a laser, and wherein the entry pore is exposed at a surface of the device disposed for contacting said microbial cells in said environment;
one or more second membranes, each second membrane comprising a plurality of feeding pores, each feeding pore having a diameter smaller than the entry pore, the feeding pores disposed for contacting a fluid comprising molecular components from said environment; and
a growth chamber for said microbial cells, the growth chamber configured for containing a culture medium fluidically coupled to the entry pore and feeding pores.
2. The device of claim 1 , wherein the entry pore has an aspect ratio (length:diameter) of from about 5 to about 10.
3. The device of claim 1 , wherein the first membrane and one second membrane are disposed at the two opposite facing sides of the device.
4. The device of claim 1 , wherein the growth chamber comprises a growth medium for the microorganism.
5. The device of claim 1 , wherein the feeding pores are disposed at a surface of the device contacting said environment.
6. The device of claim 1 , further comprising one or more sensors.
7. The device of claim 1 , further comprising a pump, an inlet port, and an outlet port, wherein the device is configured so that the pump collects environmental fluid from the inlet port and transports it into the device and out through the outlet port.
8. The device of claim 7 , wherein the device is configured so that said environmental fluid can be pumped into the growth chamber.
9. The device of claim 7 , wherein the device is configured so that said environmental fluid can flow through the feeding pores into the growth chamber.
10. The device of claim 1 , further comprising one or more fluid reservoirs and optionally one or more valves, the reservoirs and optional valves configured for adding one or more chemical agents to the growth chamber.
11. The device of claim 10 , further comprising in said one or more reservoirs one or more chemical agents selected from the group consisting of nutrients, growth factors, amino acids, sugars, carbohydrates, lipids, electrolytes, proteins, peptides, antibodies, nucleic acids, mutagens, DNA alkylating agents, and DNA methylating agents.
12. The device of claim 7 , further comprising one or more sensors and a processor for controlling said pumps and valves to regulate flows of fluid within the device and to receive signals from said sensors according to a programmed set of instructions.
13. The device of claim 12 , further comprising one or more of a memory for storage of data and instructions, a transmitter for sending data to a remote receiver, a receiver for receiving instructions for said processor, and a display.
14. A device comprising a plurality of devices of claim 1 .
15. The device of claim 14 further comprising a plurality of pumps, fluid reservoirs, and sensors that are controlled and/or monitored by a single processor.
16. The device of claim 1 , wherein one or more second membranes form one or more walls of the device.
17. The device of claim 16 , wherein second membranes form four walls of the device.