Probing of biological samples
View Patent ↗Disclosed are high throughput methods of probing multiple targets in a biological sample where the recurrent time-consuming antibody incubation steps and individual signal modification and activation steps are replaced by simultaneous hybridization of biomarkers and sequential detection by combining signal removal and activation into a single step. Also disclosed are images obtained by such methods.
1. A method of probing multiple targets in a biological sample comprising:
(a) providing a biological sample containing multiple targets;
(b) binding a set of probes to the multiple targets wherein two or more of the probes in said set of probes comprises independently:
a binder capable of specific binding to at least one target in the biological sample;
a signal generator (SG) capable of providing a detectable signal using one or more detection techniques;
a linker which couples the SG to the binder;
a masking agent coupled to the SG to which, when coupled to the SG, quenches the signal of the SG; and
wherein at least one linker and one masking agent in the set of probes are linker-mask pairs; and
the number of probes comprising each set is defines as:
P x =SG y *( OP z +1)
wherein x, y, and z are integers; and
x is the number of probes comprising a specific binder;
y is the number of signal generators (SG); and
z is the number of orthogonal linker-mask pairs (OP);
(c) detecting at least one signal from at least one signal generator from the set of probes bound in step (b);
(d) contacting the sample comprising the bound probes of step (b) with a chemical agent, electromagnetic radiation, or a combination thereof and simultaneously deactivating the at least one signal generator detected in step (c) by cleavage of a linker bound to said signal generator and activating at least one signal generator from the set of probes previously quenched by a masking agent wherein the linker and masking agent are linker-mask pairs;
(e) detecting at least one signal from the activation of the at least one newly activated signal generators in step (d);
(f) contacting the sample comprising the bound probes of the prior step with a chemical agent or electromagnetic radiation or a combination of both and simultaneously deactivating the at least one signal generator detected in the prior step by cleavage of a linker bound to said signal generator and activating at least one signal generator previously quenched by a masking agent wherein the linker and masking agent are orthogonal linker-mask pairs;
(g) detecting at least one signal from the activation of the at least signal generator in step (f); and
(h) optionally repeating steps (f)-(g).
2. The method of claim 1 wherein the binder comprises at least one antibody.
3. The method of claim 1 , wherein at least one signal generator comprises an optical signal generator, and at least one signal detected in steps (c), (e), or (f) is an optical signal.
4. The method of claim 1 , wherein at least one signal generator comprises a fluorescent signal generator, and at least one signal detected in steps (c), (e), or (f) is a fluorescent signal.
5. The method of claim 4 , wherein the fluorescent signal generator comprises a xanthene dye.
6. The method of claim 5 , wherein the xanthene dye is a fluorescein or rhodamine dye.
7. The method of claim 4 , wherein the fluorescent signal generator comprises a cyanine dye.
8. The method of claim 7 , wherein the cyanine dye is Cy3 or Cy5.
9. The method of claim 1 , wherein detecting at least one signal in steps (c), (e), or (f) is accomplished by exposing the sample to light of 300 nm-1.3 μM in wavelength.
10. The method of claim 9 , wherein detecting a signal in steps (c), (e), or (f) is accomplished by exposing the sample to light of 300-700 nm in wavelength.
11. The method of claim 1 wherein detecting at least one signal in steps (c), (e), or (f) comprises detection of the signal in a same channel.
12. The method of claim 1 , wherein a chemical agent and a photoactivated chemical bleaching agent is used independently at least once.
13. The method of claim 12 wherein the photoactivated chemical bleaching agent is activated by irradiating the sample after contacting the sample with said photoactivated chemical bleaching agent.
14. The method of claim 1 , wherein the steps (d) and (f) are performed for about 20 seconds to about 15 minutes.
15. The method of claim 1 , further comprising measuring one or more intensity values of the signal detected in detecting step (c), step (g), or steps (c) and (g).
16. The method of claim 15 , further comprising correlating the intensity value with an amount of target present in the sample.
17. The method of claim 1 , wherein steps (b)-(g) are repeated one or more times.
18. The method of claim 17 wherein in total x is an integer between 2 and 100, y is an integer between 2 and 20, and z is an integer between 1 and 25.
19. The method of claim 18 wherein x is an integer between 10 and 80, y is an integer between 2 and 10, and z is an integer between 2 and 10.
20. The method of claim 18 wherein x is an integer between 12 and 50, y is an integer between 3 and 6, and z is an integer between 2 and 5.
21. The method of claim 1 wherein at least one signal generator in detecting step (c), (e), and (g) are detected using a an electron spin resonance (ESR) detection system, a charge coupled device (CCD) detection system, a fluorescent detection system, an electrical detection system, a photographic film detection system, a chemiluminescent detection system, an enzyme detection system, an atomic force microscopy (AFM) detection system, a scanning tunneling microscopy (STM) detection system, an optical detection system, a near field detection system, or a total internal reflection (TIR) detection system.